ORCID Profile
0000-0001-9148-7544
Current Organisation
University of New South Wales
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Research Topics
In Research Link Australia (RLA), "Research Topics" refer to ANZSRC FOR and SEO codes. These topics are either sourced from ANZSRC FOR and SEO codes listed in researchers' related grants or generated by a large language model (LLM) based on their publications.
Top 5 Research Topics
ANZSRC Field of Research (FoR)
Wastewater treatment processes | Chemical engineering | Environmental Technologies | Environmental Engineering Modelling | Environmental Engineering | Industrial microbiology (incl. biofeedstocks) | Environmental biotechnology not elsewhere classified | Microbial ecology | Microbiology | Microbial taxonomy
ANZSRC Socio-Economic Objective (SEO)
Related Links
Publications
Multifaceted benefits of magnesium hydroxide dosing in sewer systems: Impacts on downstream wastewater treatment processes
Publisher: Elsevier BV
Date: 10-2023
Ubiquity of polystyrene digestion and biodegradation within yellow mealworms, larvae of Tenebrio molitor Linnaeus (Coleoptera: Tenebrionidae)
Publisher: Elsevier BV
Date: 12-2018
DOI: 10.1016/J.CHEMOSPHERE.2018.08.078
Abstract: Academics researchers and "citizen scientists" from 22 countries confirmed that yellow mealworms, the larvae of Tenebrio molitor Linnaeus, can survive by eating polystyrene (PS) foam. More detailed assessments of this capability for mealworms were carried out by12 sources: five from the USA, six from China, and one from Northern Ireland. All of these mealworms digested PS foam. PS mass decreased and depolymerization was observed, with appearance of lower molecular weight residuals and functional groups indicative of oxidative transformations in extracts from the frass (insect excrement). An addition of gentamycin (30 mg g
Achieving robust mainstream nitrite shunt at pilot-scale with integrated sidestream sludge treatment and step-feed
Publisher: Elsevier BV
Date: 09-2022
DOI: 10.1016/J.WATRES.2022.119034
Abstract: As a promising energy- and carbon efficient process for nitrogen removal from wastewater, mainstream nitrite shunt has been extensively researched. However, beyond the laboratory it is challenging to maintain stable performance by suppressing nitrite-oxidising bacteria (NOB). In this study, a pilot-scale reactor system receiving real sewage was operated in two stages for >850 days to evaluate two novel NOB suppression strategies for achieving nitrite shunt: i) sidestream sludge treatment based on alternating free nitrous acid (FNA) and free ammonia (FA) and ii) sidestream FNA/FA sludge treatment integrated with in-situ NOB suppression via step-feed. The results showed that, with sidestream sludge treatment alone, NOB developed resistance relatively quickly to the treatment, leading to unstable nitrite shunt. In contrast, robust nitrite shunt was achieved and stably maintained for more than a year when sidestream sludge treatment was integrated with a step-feed strategy. Kinetic analyses suggested that sludge treatment and step-feed worked in synergy, leading to stable NOB suppression. The integrated strategy demonstrated in this study removes a key barrier to the implementation of stable mainstream nitrite shunt.
Adaptation of nitrifying community in activated sludge to free ammonia inhibition and inactivation
Publisher: Elsevier BV
Date: 08-2020
Impact of electrochemically generated iron on the performance of an anaerobic wastewater treatment process
Publisher: Elsevier BV
Date: 06-2023
Bioleaching of toxic metals from anaerobically digested sludge without external chemical addition
Publisher: Elsevier BV
Date: 07-2021
Generality and diversity on the kinetics, toxicity and DFT studies of sulfate radical-induced transformation of BPA and its analogues
Publisher: Elsevier BV
Date: 07-2022
DOI: 10.1016/J.WATRES.2022.118506
Abstract: The international c aign to ban bisphenol A (BPA) has resulted in increasing application of BPA substitutes. However, investigations have mainly been confined to the removal of single contaminant from the water, resulting in an inefficient burden. Furthermore, systematic study and synthetical discussion of bisphenol analogues (BPs) kinetics and transformation pathways were largely underemphasized. Chemical oxidation of BPA and four typical alternatives (i.e., bisphenol AF, bisphenol E, bisphenol F and bisphenol S) in a UV-activated persulfate system was examined in this study. The effects of persulfate (PS) dosage, pH and water matrix constituents (i.e., bicarbonate, chloride and natural organic matter) were comprehensively examined using a combination of laboratory experiments and mathematical modeling. According to our findings, the removal characteristics of different BPs employing SO
Centralized iron-dosing into returned sludge brings multifaceted benefits to wastewater management
Publisher: Elsevier BV
Date: 09-2021
Pathogens inactivation in nutrient recovery from urine: A review
Publisher: Frontiers Media SA
Date: 07-12-2022
DOI: 10.3389/FENVS.2022.1056019
Abstract: Urine source separation, a kind of new sewage management concept, has made great progress in technology development and application in the past 30 years. However, understanding of the potential microbial risks in reuse of urine-derived fertilizer products (UDFPs) in agriculture is still lacking. Outbreak of pandemic of Coronavirus Disease 2019 and more deadly disease caused by Monkeypox strongly sounds the alarm bell to the attention on pathogens in urine and their fate in UDFPs. Therefore, this study presented a comprehensive review on pathogens inactivation in nutrient recovery technologies. The review suggests that technologies using alkaline or heating treatment can effectively reduce pathogens in UDFPs. However, technologies with characteristics such as membrane rejection of nutrients or nutrient adsorption may even concentrate pathogens in their fertilizer products. Based on an overall assessment, connections of technologies and the pathogens inactivation in their UDFPs have been established. This would help to provide a perspective on development of urine treatment technology and management of microbial risks in reusing urine nutrients in agriculture.
Nitrite oxidizing bacteria (NOB) contained in influent deteriorate mainstream NOB suppression by sidestream inactivation
Publisher: Elsevier BV
Date: 10-2019
DOI: 10.1016/J.WATRES.2019.07.002
Abstract: Sidestream sludge treatment approaches have been developed in recent years to achieve mainstream nitrite shunt or partial nitritation, where NOB are selectively inactivated by biocidal factors such as free nitrous acid (FNA) or free ammonium (FA) in a sidestream reactor. The existence of NOB in raw wastewater has been increasingly realized and could pose critical challenge to stable NOB suppressions in those systems. This study, for the first time, evaluated the impact of influent NOB on the NOB suppressions in a mainstream nitrite shunt system achieved through sidestream sludge treatment. An over 500-day sequential batch reactor operation with six experimental phases rigorously demonstrated the negative effects of influent NOB on mainstream NOB control. Continuously seeding of NOB contained in influent stimulated NOB community shifts, leading to different extents of ineffective NOB suppression. The role of primary wastewater treatment in NOB removal from raw wastewater was also investigated. Results suggest primary settling and High Rate Activated Sludge system could remove a large part of NOB contained in raw wastewater. Primary treatment for raw wastewater is necessary for ensuring stable mainstream NOB suppressions.
Acidic aerobic digestion of anaerobically-digested sludge enabled by a novel ammonia-oxidizing bacterium
Publisher: Elsevier BV
Date: 04-2021
Release of Organics by Conventional Activated Sludge with Appropriate Ultrasonic Treatment for Nitritation
Publisher: Springer International Publishing
Date: 2017
Characterizing and comparing microbial community and biofilm structure in three nitrifying moving bed biofilm reactors
Publisher: Elsevier BV
Date: 10-2022
DOI: 10.1016/J.JENVMAN.2022.115883
Abstract: This study investigated biofilm establishment, biofilm structure, and microbial community composition of biofilms in three laboratory-scale moving bed biofilm reactors. These reactors were filled with three types of plastic carriers with varied depths of living space for microbial growth. The reactors were operated under the same influent and operational conditions. Along with the operation, the results showed that carriers with grids of 50 μm in height delayed the biofilm development and formed the thinnest biofilm and a carpet-like structure with the lowest α- ersity. In comparison, another two carriers with grids of 200 and 400 μm in height formed thick biofilms and large colonies with more voids and channels. Quantified properties of biofilm thickness, biomass, heterogeneity, portion of the biofilm exposed to the nutrient, and maximum diffusion distance were examined, and the results demonstrated that they almost (except for heterogeneity) strongly correlated to the α- ersity of microbial community. These illustrate that depth of living space, as an important parameter for carrier, could drive the formation of biofilm structure and community composition. It improves understanding of influencing factors on biofilm establishment, structure and its microbial community, and would be helpful for the design of biofilm processes.
Robust Nitritation Sustained by Acid-Tolerant Ammonia-Oxidizing Bacteria
Publisher: American Chemical Society (ACS)
Date: 14-01-2021
Free nitrous acid pre-treatment enhances anaerobic digestion of waste activated sludge and rheological properties of digested sludge: A pilot-scale study
Publisher: Elsevier BV
Date: 04-2020
DOI: 10.1016/J.WATRES.2020.115515
Abstract: In this study, the effects of free nitrous acid (FNA) pre-treatment on the rheological properties of digested sludge were investigated at a pilot-scale, along with the improvement in volatile solids (VS) destruction and biogas production. Two pilot-scale anaerobic sludge digesters were operated for one year, one receiving thickened waste activated sludge (TWAS) without pre-treatment (control) and one receiving TWAS pre-treated for 24 h at an FNA concentration of 4.9-6.1 mgN/L (nitrite = 250 mgN/L, pH = 5.0, T = 22-30 °C). The results confirmed the enhancing effect of FNA pre-treatment on methane production (37 ± 1%), consistent with previous laboratory studies. Equally importantly, FNA pre-treatment substantially reduced the shear viscosity of TWAS by 51 ± 8% at 100 s
Transforming anaerobically digested sludge into high-quality biosolids with an integrated physiochemical approach
Publisher: Elsevier BV
Date: 09-2022
A green method for the simultaneous recovery of phosphate and potassium from hydrolyzed urine as value-added fertilizer using wood waste
Publisher: Elsevier BV
Date: 06-2020
Nitrite Oxidation in Wastewater Treatment: Microbial Adaptation and Suppression Challenges
Publisher: American Chemical Society (ACS)
Date: 17-08-2023
Hot spring distribution and survival mechanisms of thermophilic comammox Nitrospira
Publisher: Springer Science and Business Media LLC
Date: 17-04-2023
DOI: 10.1038/S41396-023-01409-W
Abstract: The recent discovery of Nitrospira species capable of complete ammonia oxidation (comammox) in non-marine natural and engineered ecosystems under mesothermal conditions has changed our understanding of microbial nitrification. However, little is known about the occurrence of comammox bacteria or their ability to survive in moderately thermal and/or hyperthermal habitats. Here, we report the wide distribution of comammox Nitrospira in five terrestrial hot springs at temperatures ranging from 36 to 80°C and provide metagenome-assembled genomes of 11 new comammox strains. Interestingly, the identification of dissimilatory nitrate reduction to ammonium (DNRA) in thermophilic comammox Nitrospira lineages suggests that they have versatile ecological functions as both sinks and sources of ammonia, in contrast to the described mesophilic comammox lineages, which lack the DNRA pathway. Furthermore, the in situ expression of key genes associated with nitrogen metabolism, thermal adaptation, and oxidative stress confirmed their ability to survive in the studied hot springs and their contribution to nitrification in these environments. Additionally, the smaller genome size and higher GC content, less polar and more charged amino acids in usage profiles, and the expression of a large number of heat shock proteins compared to mesophilic comammox strains presumably confer tolerance to thermal stress. These novel insights into the occurrence, metabolic activity, and adaptation of comammox Nitrospira in thermal habitats further expand our understanding of the global distribution of comammox Nitrospira and have significant implications for how these unique microorganisms have evolved thermal tolerance strategies.
Wastewater Primary Treatment Using Forward Osmosis Introduces Inhibition to Achieve Stable Mainstream Partial Nitrification
Publisher: American Chemical Society (ACS)
Date: 26-05-2022
Abstract: Achieving stable long-term mainstream nitrite oxidizing bacteria (NOB) suppression is the bottleneck for the novel partial nitrification (PN) process toward energy- and carbon-efficient wastewater treatment. However, long-term PN stability remains a challenge due to NOB adaptation. This study proposed and demonstrated a novel strategy for achieving NOB suppression by the primary treatment of mainstream wastewater with a forward osmosis (FO) membrane process, which facilitated two external NOB inhibition factors (salinity and free nitrous acid, FNA). To evaluate the proposed strategy, a lab-scale sequencing batch reactor was operated for 200 days. A stable PN operation was achieved with a nitrite accumulation ratio of 97.7 ± 2.8%. NOB were suppressed under the combined inhibition effect of NaCl (7.9 ± 0.2 g/L, as introduced by the FO direct filtration) and FNA (0.11 ± 0.02 mg of HNO
High Hydraulic Loading Rates Favored Mainstream Partial Nitritation: Experimental Demonstration and Model-Based Analysis
Publisher: American Chemical Society (ACS)
Date: 23-01-2023
Synergistic denitrification, partial nitrification - Anammox in a novel A2/O2 reactor for efficient nitrogen removal from low C/N wastewater
Publisher: Elsevier BV
Date: 2022
DOI: 10.1016/J.JENVMAN.2021.114069
Abstract: A biofilm-based anaerobic-aerobic (A
Reducing sulfide and methane production in gravity sewer sediments through urine separation, collection and intermittent dosing
Publisher: Elsevier BV
Date: 05-2023
Inactivation kinetics of nitrite-oxidizing bacteria by free nitrous acid
Publisher: Elsevier BV
Date: 2021
Novel Use of a Ferric Salt to Enhance Mainstream Nitrogen Removal from Anaerobically Pretreated Wastewater
Publisher: American Chemical Society (ACS)
Date: 11-04-2023
Electrochemical iron production to enhance anaerobic membrane treatment of wastewater
Publisher: Elsevier BV
Date: 10-2022
DOI: 10.1016/J.WATRES.2022.119202
Abstract: Although iron salts such as iron(III) chloride (FeCl
Efficient nitrogen removal from mainstream wastewater through coupling Partial Nitritation, Anammox and Methane-dependent nitrite/nitrate reduction (PNAM)
Publisher: Elsevier BV
Date: 11-2021
The impact of ultrasonic treatment on activity of ammonia-oxidizing bacteria and nitrite-oxidizing bacteria in activated sludge
Publisher: Springer Science and Business Media LLC
Date: 27-10-2019
Adaptation of anammox process for nitrogen removal from acidic nitritation effluent in a low pH moving bed biofilm reactor
Publisher: Elsevier BV
Date: 09-2023
Recovery of Phosphorus and Potassium from Source-Separated Urine Using a Fluidized Bed Reactor: Optimization Operation and Mechanism Modeling
Publisher: American Chemical Society (ACS)
Date: 13-03-2017
Versatility of nitrite/nitrate-dependent anaerobic methane oxidation (n-DAMO): First demonstration with real wastewater
Publisher: Elsevier BV
Date: 04-2021
The precipitation of magnesium potassium phosphate hexahydrate for P and K recovery from synthetic urine
Publisher: Elsevier BV
Date: 09-2015
DOI: 10.1016/J.WATRES.2015.05.026
Abstract: Nutrients recovery from urine to close the nutrient loop is one of the most attractive benefits of source separation in wastewater management. The current study presents an investigation of the thermodynamic modeling of the recovery of P and K from synthetic urine via the precipitation of magnesium potassium phosphate hexahydrate (MPP). Experimental results show that maximum recovery efficiencies of P and K reached 99% and 33%, respectively, when the precipitation process was initiated only through adding dissolvable Mg compound source. pH level and molar ratio of Mg:P were key factors determining the nutrient recovery efficiencies. Precipitation equilibrium of MPP and magnesium sodium phosphate heptahydrate (MSP) was confirmed via precipitates analysis using a Scanning Electron Microscope/Energy Dispersive Spectrometer and an X-ray Diffractometer. Then, the standard solubility products of MPP and MSP in the synthetic urine were estimated to be 10(-12.2 ± 0.0.253) and 10(-11.6 ± 0.253), respectively. The thermodynamic model formulated on chemical software PHREEQC could well fit the experimental results via comparing the simulated and measured concentrations of K and P in equilibrium. Precipitation potentials of three struvite-type compounds were calculated through thermodynamic modeling. Magnesium ammonium phosphate hexahydrate (MAP) has a much higher tendency to precipitate than MPP and MSP in normal urine while MSP was the main inhibitor of MPP in ammonium-removed urine. To optimize the K recovery, ammonium should be removed prior as much as possible and an alternative alkaline compound should be explored for pH adjustment rather than NaOH.
Evaluating the excess sludge reduction in activated sludge system with ultrasonic treatment
Publisher: IWA Publishing
Date: 10-04-2018
DOI: 10.2166/WST.2018.164
Abstract: Ultrasonic treatment for enhancing biological processes has recently attracted considerable attention in wastewater treatment. In this study, we systematically investigated the mixed liquor properties of activated sludge under ultrasonic treatment. The sludge s les were collected from the aerobic tank of a full-scale membrane bioreactor (MBR) treating municipal wastewater, and the volatile suspended solids (VSS) concentration was approximately 6.0 g/L. The results showed that ultrasonic treatment induced floc disintegration, organics release, temperature increase, microbial activity and pH variation. The maximum mg soluble chemical oxygen demand (COD) per mg VSS released was estimated to be 0.147 using the Monod equation. The exponential increase in the concentration of dissolved organic matter is related to the loss of relative heterotrophic bacterial activity. A sonolysis-cryptic growth model was demonstrated to be capable of describing ultrasonic sludge reduction, which would support the further development of ultrasonic treatment technology in activated sludge systems.
Effect of blending landfill leachate with activated sludge on the domestic wastewater treatment process
Publisher: Royal Society of Chemistry (RSC)
Date: 2019
DOI: 10.1039/C8EW00799C
Abstract: A sludge contact is proposed to form high-level free ammonia exposure for co-treatment of landfill leachate with domestic wastewater.
Achieving mainstream nitrogen removal via the nitrite pathway from real municipal wastewater using intermittent ultrasonic treatment
Publisher: Elsevier BV
Date: 03-2019
DOI: 10.1016/J.ULTSONCH.2018.07.033
Abstract: Achieving mainstream nitrogen removal via the nitrite pathway (NH
Impact of sewer biofilms on fate of SARS-CoV-2 RNA and wastewater surveillance
Publisher: Springer Science and Business Media LLC
Date: 09-02-2023
Selective enrichment and metagenomic analysis of three novel comammox Nitrospira in a urine-fed membrane bioreactor
Publisher: Springer Science and Business Media LLC
Date: 25-03-2021
DOI: 10.1038/S43705-021-00005-3
Abstract: The discovery of complete ammonia-oxidizing (comammox) Nitrospira has added an important new process to the microbial nitrogen cycle. While comammox Nitrospira have been detected in various ecosystems, only few studies have achieved their enrichment over other canonical nitrifiers. Here, we obtained a selective enrichment of comammox Nitrospira in a urine-fed membrane bioreactor in less than 200 days. By using 16S rRNA gene licon sequencing and quantitative PCR of the functional marker gene amoA , we observed a dominance (up to 30% relative abundance) of comammox Nitrospira over ammonia-oxidizing bacteria and archaea. Furthermore, the complete genomes of three new clade A comammox Nitrospira were recovered by metagenomics. These three strains were ergent from previously reported comammox species according to comparative genome and amoA -based analyses. In addition to the key genes for ammonia and nitrite oxidation, the three recovered genomes contained a complete urea utilization pathway. Our findings suggest that the urea present in the urine media played a significant role in the selective enrichment of these novel comammox Nitrospira , and support the ersity and versatility of their metabolism.
Determining Factors for Nitrite Accumulation in an Acidic Nitrifying System: Influent Ammonium Concentration, Operational pH, and Ammonia-Oxidizing Community
Publisher: American Chemical Society (ACS)
Date: 25-07-2022
Abstract: Acidic nitrification is attracting wide attention because it can enable robust suppression of nitrite-oxidizing bacteria (NOB) in wastewater treatment. This study reports a comprehensive assessment of the novel acidic nitrification process to identify the key factors that govern stable nitrite accumulation. A laboratory-scale moving-bed biofilm reactor receiving low-alkalinity wastewater was continuously operated under acidic conditions (pH < 6) for around two years, including nine stages varying influent and operational conditions. The results revealed that nitrite accumulation was related to three factors, i.e., influent ammonium concentration, operating pH, and ammonia-oxidizing microbial community. These three factors impact nitrite accumulation by altering the
Water Reduction and Nutrient Reconcentration of Hydrolyzed Urine via Direct-Contact Membrane Distillation: Ammonia Loss and Its Control
Publisher: American Society of Civil Engineers (ASCE)
Date: 03-2019
Biochar as a Carrier of Struvite Precipitation for Nitrogen and Phosphorus Recovery from Urine
Publisher: American Society of Civil Engineers (ASCE)
Date: 10-2018
Free nitrous acid-based suppression of sulfide production in sewer sediments: In-situ effect mechanism
Publisher: Elsevier BV
Date: 05-2020
Feasibility of methane bioconversion to methanol by acid-tolerant ammonia-oxidizing bacteria
Publisher: Elsevier BV
Date: 06-2021
The effects of influent and operational conditions on nitrogen removal in an upflow microaerobic sludge blanket system: A model-based evaluation
Publisher: Elsevier BV
Date: 2020
DOI: 10.1016/J.BIORTECH.2019.122225
Abstract: Recently, upflow microaerobic sludge blanket (UMSB) system has been developed to remove ammonium and organic matter simultaneously. This study aims to establish influent and operational conditions promoting anammox-based nitrogen removal process in the UMSB reactor by using a modified Activated Sludge Model. Experiments were performed on a laboratory-scale UMSB reactor treated piggery wastewater for over two years. With the experimentally determined model parameters, the established model well simulated the UMSB reactor performance. The maximum anammox growth rate was calibrated to be 0.41 d
The advantage of a two-stage nitrification method for fertilizer recovery from human urine
Publisher: Elsevier BV
Date: 05-2023
Nitrification potential of daily-watered biofiltration designs for high ammonium wastewater treatment
Publisher: Elsevier BV
Date: 03-2023
Short-chain fatty acid (SCFA) production maximization by modeling thermophilic sludge fermentation
Publisher: Royal Society of Chemistry (RSC)
Date: 2019
DOI: 10.1039/C8EW00572A
Abstract: Devising a model to optimize organic and microbial community inputs, temperature and solid retention time for production of more short-chain fatty acids.
Unravelling adaptation of nitrite-oxidizing bacteria in mainstream PN/A process: Mechanisms and counter-strategies
Publisher: Elsevier BV
Date: 07-2021
Achieving Stable Partial Nitritation in an Acidic Nitrifying Bioreactor
Publisher: American Chemical Society (ACS)
Date: 02-12-2019
Abstract: Partial nitritation providing a suitable effluent for subsequent anammox is a critical step in a two-stage autotrophic nitrogen removal system. This study demonstrates an innovative approach for attaining partial nitritation in an acidic bioreactor operating at a slightly low pH (i.e., 5-6). This approach is based on our hypothesis in this study that acid-tolerant ammonia-oxidizing bacteria (AOB) can produce nitrite and protons to self-sustain free nitrous acid (FNA, NO
Recovery of ammonium and phosphate from urine as value-added fertilizer using wood waste biochar loaded with magnesium oxides
Publisher: Elsevier BV
Date: 06-2018
Comammox Nitrospira Bacteria Are Dominant Ammonia Oxidizers in Mainstream Nitrification Bioreactors Emended with Sponge Carriers
Publisher: American Chemical Society (ACS)
Date: 16-08-2022
Abstract: Complete ammonia oxidation (i.e., comammox) is a newly discovered microbial process performed by a subset of the
Critical Factors Facilitating Candidatus Nitrotoga To Be Prevalent Nitrite-Oxidizing Bacteria in Activated Sludge
Publisher: American Chemical Society (ACS)
Date: 12-11-2020
Ammonium concentration determines oxygen penetration depth to impact the suppression of nitrite-oxidizing bacteria inside partial nitritation and anammox biofilms
Publisher: Elsevier BV
Date: 2023
Impact of impurities on vivianite crystallization for phosphate recovery from process water of hydrothermal carbonization of kitchen waste
Publisher: Elsevier BV
Date: 10-2022
Insights into Nitrous Oxide Mitigation Strategies in Wastewater Treatment and Challenges for Wider Implementation
Publisher: American Chemical Society (ACS)
Date: 12-05-2021
Free ammonia shock treatment eliminates nitrite-oxidizing bacterial activity for mainstream biofilm nitritation process
Publisher: Elsevier BV
Date: 08-2020
Hydrogen sulfide generation and emission in urban sanitary sewer in China: what factor plays the critical role?
Publisher: Royal Society of Chemistry (RSC)
Date: 2019
DOI: 10.1039/C8EW00617B
Abstract: Identifying hydrogen sulfide (H 2 S) hotspots is critical for preventing/controlling odor and corrosion problems in sewer systems.
A 20-Year Journey of Partial Nitritation and Anammox (PN/A): from Sidestream toward Mainstream
Publisher: American Chemical Society (ACS)
Date: 03-06-2022
Integrated urban water management by coupling iron salt production and application with biogas upgrading
Publisher: Springer Science and Business Media LLC
Date: 12-10-2023
Mycolicibacter acidiphilus sp. nov., an extremely acid-tolerant member of the genus Mycolicibacter
Publisher: Microbiology Society
Date: 09-06-2022
Abstract: A nonmotile, facultatively anaerobic and rod-shaped bacterial strain, designated M1 T was isolated from a bioreactor being operated at pH ~2 at Brisbane, Australia. Colonies appeared to be convex and white. Phylogenetic analysis of its genome revealed an affiliation with the genus Mycolicibacter and its closest species based on 16S rRNA gene analysis were Mycolicibacter algericus DSM 45454 T (98.8 % similarity) and Mycolicibacter terrae CIP 104321 T (98.8 %) with which strain M1 T shared average nucleotide identity of 81.2 % and digital DNA–DNA hybridization similarity of 23.8 %. Strain M1 T grew optimally at 0 % NaCl, at pH 6 and at between 30–33 °C. The polar lipid profile of strain M1 T consisted of diphosphatidylglycerol, aminophosphoglycolipid, phosphatidylcholine, phospholipid, aminolipid, phosphoglyolipid, phosphatidylglycerol, two unidentified glycolipids and four unidentified lipids. The dominant cellular fatty acids ( %) were C 16 : 0 and C 18 : 1 ω 9 c and summed feature 7 (C 19 : 1 ω 7 c and/or C 19 : 1 ω 6 c ). The DNA G+C content of strain M1 T was 69.1 mol%. Based on in silico phylogenomic analysis coupled with physiological and chemotaxonomic characterizations, we classify strain M1 T as representing a novel species within the genus Mycolicibacter , for which the name Mycolicibacter acidiphilus nov. is proposed. The type strain is M1 T (=MCCC 1H00416 T =KCTC 49392 T ).
Challenges of suppressing nitrite-oxidizing bacteria in membrane aerated biofilm reactors by low dissolved oxygen control
Publisher: Elsevier BV
Date: 12-2023
Predictions of the Influent and Operational Conditions for Partial Nitritation with a Model Incorporating pH Dynamics
Publisher: American Chemical Society (ACS)
Date: 10-05-2018
Abstract: Ammonium partial oxidation to nitrite (i.e., partial nitritation) is required in a two-stage autotrophic nitrogen removal system, to provide effluent suitable for the anammox reaction. This study aims to establish influent (ammonium and bicarbonate concentrations) and operational (dissolved oxygen (DO) concentration and solids retention time (SRT)) conditions that favor partial nitritation. This is achieved through extending the nitritation and nitratation models to predict pH variation as well as the effects of pH, free ammonia (NH
Toward Energy Neutrality: Novel Wastewater Treatment Incorporating Acidophilic Ammonia Oxidation
Publisher: American Chemical Society (ACS)
Date: 10-03-2023
New insight into increased toxicity during ozonation of chlorophenol: The significant contribution of oxidizing intermediates
Publisher: Elsevier BV
Date: 05-2021
Factors Affecting the Crystal Size of Struvite-K Formed in Synthetic Urine Using a Stirred Reactor
Publisher: American Chemical Society (ACS)
Date: 03-12-2018
Stoichiometric and kinetic characterization of an acid-tolerant ammonia oxidizer ‘Candidatus Nitrosoglobus’
Publisher: Elsevier BV
Date: 05-2021
Selective Enrichment of Comammox Nitrospira in a Moving Bed Biofilm Reactor with Sufficient Oxygen Supply
Publisher: American Chemical Society (ACS)
Date: 09-2022
Abstract: The recent discovery of comammox (complete ammonia oxidation)
Mesothermal pretreatment using FeCl3 enhances methane production from rice straw
Publisher: Elsevier BV
Date: 04-2022
Post-treatment options for anaerobically digested sludge: Current status and future prospect
Publisher: Elsevier BV
Date: 10-2021
Significant production of nitric oxide by aerobic nitrite reduction at acidic pH
Publisher: Elsevier BV
Date: 02-2023
In-situ advanced oxidation of sediment iron for sulfide control in sewers
Publisher: Elsevier BV
Date: 07-2023
Achieving high-level nutrient removal and wastewater treatment capacity through iron-mediated microbial process and sludge granulation
Publisher: Elsevier BV
Date: 03-2023
Membrane reciprocation as energy-efficient fouling control with high biogas recovery in a pilot-scale anaerobic membrane bioreactor
Publisher: Elsevier BV
Date: 03-2023
Nitrite production from urine for sulfide control in sewers
Publisher: Elsevier BV
Date: 10-2017
DOI: 10.1016/J.WATRES.2017.05.048
Abstract: Most commonly used methods for sewer sulfide control involves dosing chemical agents to wastewater, which incurs high operational costs. Here, we propose and demonstrate a cost-effective and environmentally attractive approach to sewer sulfide control through urine separation and its subsequent conversion to nitrite prior to intermittent dosage to sewers. Urine collected from a male toilet urinal was fed to laboratory-scale sequencing batch reactors. The reactors stably converted roughly 50% of the nitrogen in urine to nitrite, with high abundance (at 17.46%) of known ammonia-oxidizing bacteria (AOB) of the genus Nitrosomonas, and absence (below detection level) of typical nitrite-oxidizing bacteria of the genus Nitrospira, according to 454 pyrosequencing analysis. The stable nitrite production was achieved at both relatively high (1.0-2.0 mg/L) and low (0.2-0.3 mg/L) dissolved oxygen concentrations. Dosing tests in laboratory-scale sewer systems confirmed the sulfide control effectiveness of free nitrous acid generated from urine. Life cycle assessment indicated that, compared with commodity chemicals, nitrite/free nitrous acid (FNA) production from urine for sulfide control in sewers would lower the operational costs by approximately 2/3 and greenhouse gas (GHG) emissions by 1/3 in 20 years.
Study on enhanced denitrification using particulate organic matter in membrane bioreactor by mechanism modeling
Publisher: Elsevier BV
Date: 11-2013
DOI: 10.1016/J.CHEMOSPHERE.2013.08.045
Abstract: Particulate organic matter (POM) in wastewater is a potential denitrification carbon source, while the optimal operational mode using denitrification mechanism with POM is still unclear in wastewater treatment plants. In this work, we investigated the denitrification rates (DNRs) in a full-scale membrane bioreactor (MBR) coupled with two-stage pre-anoxic (pre-AN), and then evaluated the POM denitrification efficiency using mechanism modeling. The results indicate that POM related fraction accounted for the majority of the obtained specific DNR of 1.39±0.46mgNg(-1) MLVSS h(-1) in the second pre-AN without available soluble carbon source. The modeling approaches with calibration and validation procedures estimated a high residual POM concentration of 0.17g COD g(-1) MLVSS in the activated sludge, which provided specific DNR of 1.14mgNg(-1) MLVSS h(-1). High POM retention time in the reactor was the result of high solid retention time used in the MBR. In particular, post-AN of high biomass concentration could provide the highest POM denitrification efficiency in MBR. The MBR process combined with additional sludge reduction technology could further enhance denitrification by POM.
Ultrasonic Treatment Enhanced Ammonia-Oxidizing Bacterial (AOB) Activity for Nitritation Process
Publisher: American Chemical Society (ACS)
Date: 31-12-2015
Abstract: Oxidation of ammonia to nitrite rather than nitrate is critical for nitritation process for wastewater treatment. We proposed a promising approach by using controlled ultrasonic treatment to enhance the activity of ammonia-oxidizing bacteria (AOB) and suppress that of nitrite-oxidizing bacteria (NOB). Batch activity assays indicated that when ultrasound was applied, AOB activity reached a peak level and then declined but NOB activity deteriorated continuously as the power intensity of ultrasound increased. Kinetic analysis of relative microbial activity versus ultrasonic energy density was performed to investigate the effect of operational factors (power, sludge concentration, and aeration) on AOB and NOB activities and the test parameters were selected for reactor tests. Laboratory sequential batch reactor (SBR) was further used to test the ultrasonic stimulus with 8 h per day operational cycle and synthetic waste urine as influent. With specific ultrasonic energy density of 0.09 kJ/mg VSS and continuously fed influent containing above 200 mg NH3-N/L, high AOB reproductive activity was achieved and nearly complete conversion of ammonia-N to nitrite was maintained. Microbial structure analysis confirmed that the treatment changed community of AOB, NOB, and heterotrophs. Known AOB Nitrosomonas genus remained at similar level in the biomass while typical NOB Nitrospira genus disappeared in the SBR under ultrasonic treatment and after the treatment was off for 30 days.
Thermophilic Hydrolysis and Fermentation to Produce Short-Chain Fatty Acids from Waste Sludge
Publisher: Springer International Publishing
Date: 2017
Use of low frequency and density ultrasound to stimulate partial nitrification and simultaneous nitrification and denitrification
Publisher: Elsevier BV
Date: 10-2013
DOI: 10.1016/J.BIORTECH.2013.07.044
Abstract: Low frequency and density ultrasound has attracted considerable attention in enhancing wastewater treatment performance, particularly in the removal of nitrogen. In the present study, two sequencing batch reactors were operated to confirm the effects of ultrasound at the frequency of 40 kHz and density of 0.027 W/mL on partial nitrification and simultaneous nitrification and denitrification (SND). At the optimal irradiation time of 2.0 h, the obtained nitrite accumulation ratio and SND efficiency at full aerobic were 73.9% and 72.8%, respectively. Nitrite accumulation was the result of increased NH4(+)-N removal and improved ammonia oxidizing bacteria (AOB) activity with simultaneous inhibition of nitrite oxidizing bacteria (NOB) activity. Ultrasonic treatment could provide suitable conditions in temperature and pH for AOB growth, and destroy the NOB community structure. Moreover, organic matters were released and offered an additional carbon source for denitrification apart from the negative effects on sludge properties.
An integrated strategy to enhance performance of anaerobic digestion of waste activated sludge
Publisher: Elsevier BV
Date: 05-2021
A Novel Source of Radicals from UV/Dichloroisocyanurate for Surpassing Abatement of Emerging Contaminants Versus Conventional UV/Chlor(am)ine Processes
Publisher: American Chemical Society (ACS)
Date: 20-01-2023
One-year stable pilot-scale operation demonstrates high flexibility of mainstream anammox application
Publisher: Elsevier BV
Date: 05-2023
Temperature Variations Shape Niche Occupation of Nitrotoga-like Bacteria in Activated Sludge
Publisher: American Chemical Society (ACS)
Date: 09-09-2021
Modeling of enhanced denitrification capacity with microbial storage product in MBR systems
Publisher: Elsevier BV
Date: 04-2014
Effects of ultrasonic treatment on the ammonia-oxidizing bacterial (AOB) growth kinetics
Publisher: Elsevier BV
Date: 11-2019
DOI: 10.1016/J.SCITOTENV.2019.06.435
Abstract: Ultrasound has in the past few decades found applications in a variety of disciplines including chemistry, medicine, physics, and to a much less extent microbiology. Our previous studies found that ultrasonic treatment increases the activity of ammonia-oxidizing bacteria (AOB) while suppressing nitrite-oxidizing bacteria (NOB), resulting in beneficial effects in wastewater treatment. In this study, the kinetic and microbiological features of nitrifying microorganisms in activated sludge intermittently treated with ultrasound were investigated to gain an improved understanding of the mechanism involved in ultrasound-induced stimulation of AOB kinetics. The nitrifying microorganisms were initially enriched over 100 days in a laboratory sequential batch reactor (SBR). Ultrasonic treatment of the sludge was then applied with the treatment time in each 12 h SBR cycle progressively increased from 4 to 24 min. Application of the treatment for 21 days led to a doubled maximum specific ammonia oxidation rate, and also the enhanced dominance of known AOB Nitrosomonas genus in the biomass. This stimulatory effect is well described by a modified enzyme catalyzed reaction model, showing a good linear relationship between the natural logarithm value of μ
An integrated approach to vivianite recovery from waste activated sludge
Publisher: Elsevier BV
Date: 03-2023
A critical review of chemical uses in urban sewer systems
Publisher: Elsevier BV
Date: 07-2023
Improving wastewater management using free nitrous acid (FNA)
Publisher: Elsevier BV
Date: 03-2020
DOI: 10.1016/J.WATRES.2019.115382
Abstract: Free nitrous acid (FNA), the protonated form of nitrite, has historically been an unwanted substance in wastewater systems due to its inhibition on a wide range of microorganisms. However, in recent years, advanced understanding of FNA inhibitory and biocidal effects on microorganisms has led to the development of a series of FNA-based applications that improve wastewater management practices. FNA has been used in sewer systems to control sewer corrosion and odor in wastewater treatment to achieve carbon and energy efficient nitrogen removal in sludge management to improve the sludge reduction and energy recovery in membrane systems to address membrane fouling and in wastewater algae systems to facilitate algae harvesting. This paper aims to comprehensively and critically review the current status of FNA-based applications in improving wastewater management. The underlying mechanisms of FNA inhibitory and biocidal effects are also reviewed and discussed. Knowledge gaps and current limitations of the FNA-based applications are identified and perspectives on the development of FNA-based applications are discussed. We conclude that the FNA-based technologies have great potential for enhancing the performance of wastewater systems however, further development and demonstration at larger scales are still required for their wider applications.
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