ORCID Profile
0000-0003-3337-8678
Current Organisation
RMIT University
Does something not look right? The information on this page has been harvested from data sources that may not be up to date. We continue to work with information providers to improve coverage and quality. To report an issue, use the Feedback Form.
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.
Rheology | Chemical Engineering | Wastewater Treatment Processes
Industrial Chemicals and Related Products not elsewhere classified |
Publisher: American Chemical Society (ACS)
Date: 07-06-2017
Publisher: American Chemical Society (ACS)
Date: 30-11-2017
Publisher: Elsevier BV
Date: 06-2020
Publisher: Elsevier BV
Date: 09-2015
Publisher: American Chemical Society (ACS)
Date: 28-02-2014
DOI: 10.1021/IE402252C
Publisher: Elsevier
Date: 2021
Publisher: Springer Science and Business Media LLC
Date: 02-01-2017
Publisher: Elsevier BV
Date: 05-2023
Publisher: Elsevier BV
Date: 03-2016
Publisher: Elsevier BV
Date: 07-2016
Publisher: Elsevier BV
Date: 05-2022
DOI: 10.1016/J.BIORTECH.2022.127087
Abstract: A hybrid machine learning (ML) aided experimental approach was proposed in this study to evaluate the growth kinetics of Candida antarctica for lipase production. Different ML models were trained and optimized to predict the growth curves at various substrate concentrations. Results on comparison demonstrate the superior performance of the Gradient boosting regression (GBR) model in growth curves prediction. GBR-based growth kinetics was found to be matching well with the results of the conventional experimental approach while significantly reducing the experimental effort, time, and resources by ∼ 50%. Further, the activity and enzyme kinetics of lipase produced in this study was investigated on hydrolysis of p-nitrophenyl butyrate resulting in a maximum lipase activity of 24.07 U at 44 h. The robustness and significance of developed kinetic models were ensured through detailed statistical analysis. The application of the proposed hybrid approach can be extended to any other microbial process.
Publisher: Elsevier BV
Date: 02-2018
Publisher: Elsevier BV
Date: 05-2023
Publisher: Springer Science and Business Media LLC
Date: 27-07-2021
Publisher: Elsevier BV
Date: 12-2017
Publisher: Elsevier BV
Date: 02-2019
DOI: 10.1016/J.BIORTECH.2018.12.011
Abstract: The adoption of process intensification to anaerobic digestion can present significant complications for digester mixing and process performance. This work investigated how increasing the solids concentration of the digester sludge influenced the process at various mixing energy inputs. Based on the results, adequate mixing is defined qualitatively as the input of sufficient energy to mobilize the reactor contents without producing significant regions of inhibitory shear force. However, the quantitative definition is dependent on the solids concentration of the sludge. But, the existing design criterion of specific mixing power input based on fluid volume (W/m
Publisher: Elsevier BV
Date: 04-2023
Publisher: Springer Science and Business Media LLC
Date: 12-04-2019
Publisher: Elsevier BV
Date: 08-2010
Publisher: Elsevier BV
Date: 03-2014
DOI: 10.1016/J.BIORTECH.2013.12.066
Abstract: With rapid world population growth and strict environmental regulations, increasingly large volumes of sludge are being produced in today's wastewater treatment plants (WWTP) with limited disposal routes. Sludge treatment has become an essential process in WWTP, representing 50% of operational costs. Sludge destruction and resource recovery technologies are therefore of great ongoing interest. Hydrothermal processing uses unique characteristics of water at elevated temperatures and pressures to deconstruct organic and inorganic components of sludge. It can be broadly categorized into wet oxidation (oxidative) and thermal hydrolysis (non-oxidative). While wet air oxidation (WAO) can be used for the final sludge destruction and also potentially producing industrially useful by-products such as acetic acid, thermal hydrolysis (TH) is mainly used as a pre-treatment method to improve the efficiency of anaerobic digestion. This paper reviews current hydrothermal technologies, roles of wet air oxidation and thermal hydrolysis in sludge treatment, and challenges faced by these technologies.
Publisher: Elsevier
Date: 2021
Publisher: Wiley
Date: 11-06-2018
Publisher: Informa UK Limited
Date: 13-06-2017
Publisher: Elsevier BV
Date: 11-2016
Publisher: Elsevier BV
Date: 05-2017
DOI: 10.1016/J.WATRES.2017.02.031
Abstract: Hydrothermal processing plays a significant role in sewage sludge treatment. However, the rheological behaviour of sludge during these processes is not fully understood. A better understanding of the sludge rheology under hydrothermal processing conditions can help improve process efficiency. Moreover, sludge rheology is easier to measure than chemical analyses. If a relationship could be established, it provides a possibility of using rheological measurement as a basis for monitoring the performance of hydrothermal processing. The rheological changes in thickened waste activated sludge (7 wt%) was investigated using a pressure cell-equipped rheometer during 60-min thermal hydrolysis (TH) at various temperatures (80-145 °C) and constant pressure (5 bar). Changes in the soluble chemical oxygen demand (COD) were measured using a separate reactor with a similar operating condition. The sludge behaved as a shear-thinning fluid and could be described by the Herschel-Bulkley model. At constant temperature, the yield stress and high-shear (600 s
Publisher: Elsevier BV
Date: 03-2023
Publisher: Elsevier BV
Date: 11-2023
Publisher: American Chemical Society (ACS)
Date: 03-1994
DOI: 10.1021/IE00027A032
Publisher: Wiley
Date: 05-04-2017
DOI: 10.1002/CJCE.22803
Publisher: Wiley
Date: 05-2009
DOI: 10.1002/APP.30327
Publisher: Elsevier BV
Date: 1985
Publisher: Wiley
Date: 08-2018
DOI: 10.1002/AIC.16358
Publisher: American Chemical Society (ACS)
Date: 27-09-2016
Publisher: Informa UK Limited
Date: 13-01-2017
DOI: 10.1080/10934529.2016.1270674
Abstract: In a wastewater treatment process, energy is mainly used in sludge handling and heating, while energy is recovered by biogas production in anaerobic digestion process. Thermal pre-treatment of sludge can change the energy balance in a wastewater treatment process since it reduces the viscosity and yield stress of sludge and increases the biogas production. In this study, a calculation based on a hypothetical wastewater treatment plant is provided to show the possibility of creating a net positive energy wastewater treatment plant as a result of implementing thermal pre-treatment process before the anaerobic digester. The calculations showed a great energy saving in pumping and mixing of the sludge by thermal pre-treatment of sludge before anaerobic digestion process.
Publisher: Springer Science and Business Media LLC
Date: 18-05-2020
Publisher: Elsevier BV
Date: 2017
DOI: 10.1016/J.ULTSONCH.2016.06.026
Abstract: This paper aims at investigating the influence of acoustic streaming induced by low-frequency (24kHz) ultrasound irradiation on mass transfer in a two-phase system. The main objective is to discuss the possible mass transfer improvements under ultrasound irradiation. Three analyses were conducted: i) experimental analysis of mass transfer under ultrasound irradiation ii) comparative analysis between the results of the ultrasound assisted mass transfer with that obtained from mechanically stirring and iii) computational analysis of the systems using 3D CFD simulation. In the experimental part, the interactive effects of liquid rheological properties, ultrasound power and superficial gas velocity on mass transfer were investigated in two different sonicators. The results were then compared with that of mechanical stirring. In the computational part, the results were illustrated as a function of acoustic streaming behaviour, fluid flow pattern, gas/liquid volume fraction and turbulence in the two-phase system and finally the mass transfer coefficient was specified. It was found that additional turbulence created by ultrasound played the most important role on intensifying the mass transfer phenomena compared to that in stirred vessel. Furthermore, long residence time which depends on geometrical parameters is another key for mass transfer. The results obtained in the present study would help researchers understand the role of ultrasound as an energy source and acoustic streaming as one of the most important of ultrasound waves on intensifying gas-liquid mass transfer in a two-phase system and can be a breakthrough in the design procedure as no similar studies were found in the existing literature.
Publisher: Elsevier BV
Date: 04-2018
Publisher: Wiley
Date: 10-06-2011
DOI: 10.1002/AIC.12657
Publisher: Informa UK Limited
Date: 2010
DOI: 10.1252/JCEJ.09WE131
Publisher: American Chemical Society (ACS)
Date: 06-08-2018
Publisher: Elsevier BV
Date: 10-2016
Publisher: Elsevier BV
Date: 08-2017
Publisher: Elsevier BV
Date: 09-2018
DOI: 10.1016/J.BIORTECH.2018.05.038
Abstract: The relationship between mixing energy input and biogas production was investigated by anaerobically digesting sewage sludge in lab scale, hydraulically mixed, batch mode digesters at six different specific energy inputs. The goal was to identify how mixing energy influenced digestion performance at quantitative levels to help explain the varying results in other published works. The results showed that digester homogeneity was largely uninfluenced by energy input, whereas cumulative biogas production and solids destruction were. With similar solids distributions between conditions, the observed differences were attributed to shear forces disrupting substrate-microbe flocs rather than the formation of temperature and/or concentration gradients. Disruption of the substrate-microbe flocs produced less favourable conditions for hydrolytic bacteria, resulting in less production of biomass and more biogas. Overall, this hypothesis explains the current body of research including the inhibitory conditions reported at extreme mixing power inputs. However, further work is required to definitively prove it.
Publisher: Elsevier BV
Date: 12-2020
Publisher: Wiley
Date: 11-2018
DOI: 10.1002/APJ.2267
Publisher: Springer Science and Business Media LLC
Date: 09-11-2019
Publisher: Wiley
Date: 30-10-2008
DOI: 10.1002/APP.29073
Publisher: Elsevier BV
Date: 02-2018
Publisher: Elsevier BV
Date: 07-2016
Publisher: Elsevier BV
Date: 10-2022
Publisher: Elsevier BV
Date: 12-2022
Publisher: Elsevier BV
Date: 2018
Publisher: Elsevier BV
Date: 07-2016
Publisher: Elsevier BV
Date: 10-2017
Publisher: Elsevier BV
Date: 07-2023
Publisher: IOP Publishing
Date: 04-2017
Publisher: Royal Society of Chemistry (RSC)
Date: 2018
DOI: 10.1039/C8RA02106F
Abstract: Novel microwave mediated drying of naproxen sodium has been shown as an efficient drying technique as well as exhibiting a critical role in improving the dissolution kinetics.
Publisher: The Royal Society
Date: 2018
DOI: 10.1098/RSOS.171037
Abstract: Submerged recirculating jet mixing systems are an efficient and economical method of agitating large tanks with a high hydraulic residence time. Much work has been carried out in developing design correlations to aid the predictions of the mixing time in such systems, with the first such correlation being developed nearly 70 years ago. In most of these correlations, the mixing time depends directly on the volume of the vessel and inversely on the injection velocity of the submerged jet. This work demonstrates, for the first time, that the distance between the injection and suction nozzles also significantly affects the mixing time and can be used to control this time scale. The study introduces a non-dimensional quantity that can be used as an adjustable parameter in systems where such control is desired.
Publisher: IOP Publishing
Date: 11-2019
DOI: 10.1088/1742-6596/1349/1/012048
Abstract: In this study, polylactide (PLA)/montmorillonite (MMT) composites were prepared by melt intercalation technique. Three types of MMT, Cloisite® 30B, Cloisite® Na + and Cloisite® Ca ++ DEV were used as fillers. The morphology and mechanical properties of the composite materials were investigated and compared with unfilled PLA, keeping the same thermomechanical history. The morphology of the composite materials was evaluated by small-angle x-ray scattering (SAXS), scanning electron microscopy (SEM) and transmission electron microscopy (TEM), and the tensile properties of these composites were measured by an Instron universal testing machine. The morphology observations showed that the good affinity between the organo-modified clay (Cloisite® 30B) and the PLA was sufficient to form intercalated structure in the nanocomposite. Cloisite® Na + and Cloisite® Ca ++ DEV clays exhibited a modest improvement of the young’s modulus of about 18 % and 17 % respectively, due to poor dispersion in the PLA matrix as well as poor polymer-filler interactions compared to Cloisite® 30B. Compared to those of pure PLA, the PLA/Cloisite® 30B composites showed notable improvement of the Young’s modulus of about 54 %.
Publisher: MDPI AG
Date: 28-11-2013
DOI: 10.3390/SU5125052
Publisher: Elsevier BV
Date: 02-2016
Publisher: Elsevier BV
Date: 12-2021
Publisher: Elsevier BV
Date: 03-2016
Publisher: Wiley
Date: 24-01-2017
DOI: 10.1002/AIC.15640
Publisher: Informa UK Limited
Date: 1996
DOI: 10.1252/JCEJ.29.1030
Publisher: Elsevier BV
Date: 08-2016
Publisher: Elsevier BV
Date: 03-2019
Publisher: Elsevier BV
Date: 10-2014
Publisher: Elsevier BV
Date: 11-2019
Publisher: Elsevier BV
Date: 06-2019
DOI: 10.1016/J.WATRES.2019.03.039
Abstract: Rheological properties are important in the design and operation of sludge-handling process. Despite this, the rheology of sludge in thermal hydrolysis processes (TH) is not well described. In-situ measurements were performed to characterize the flow behaviour of various concentrations (7-13 wt%) of waste activated sludge (WAS) at TH conditions. Equations were presented for predicting in-situ rheological parameters (high-shear viscosity, η
Publisher: Elsevier BV
Date: 10-2016
Publisher: Wiley
Date: 05-06-2012
Publisher: Elsevier BV
Date: 09-2016
DOI: 10.1016/J.WATRES.2016.05.045
Abstract: Predicting the flow behaviour, most notably, the apparent viscosity and yield stress of sludge mixtures inside the anaerobic digester is essential because it helps optimize the mixing system in digesters. This paper investigates the rheology of sludge mixtures as a function of digested sludge volume fraction. Sludge mixtures exhibited non-Newtonian, shear thinning, yield stress behaviour. The apparent viscosity and yield stress of sludge mixtures prepared at the same total solids concentration was influenced by the interactions within the digested sludge and increased with the volume fraction of digested sludge - highlighted using shear compliance and shear modulus of sludge mixtures. However, when a thickened primary - secondary sludge mixture was mixed with dilute digested sludge, the apparent viscosity and yield stress decreased with increasing the volume fraction of digested sludge. This was caused by the dilution effect leading to a reduction in the hydrodynamic and non-hydrodynamic interactions when dilute digested sludge was added. Correlations were developed to predict the apparent viscosity and yield stress of the mixtures as a function of the digested sludge volume fraction and total solids concentration of the mixtures. The parameters of correlations can be estimated using pH of sludge. The shear and complex modulus were also modelled and they followed an exponential relationship with increasing digested sludge volume fraction.
Publisher: Wiley
Date: 05-11-2009
DOI: 10.1002/CJCE.20231
Publisher: Springer Science and Business Media LLC
Date: 06-01-2016
DOI: 10.1007/S00449-015-1530-4
Abstract: This study aims to investigate the mixing characteristics of a transparent sludge simulant in a mechanically agitated model digester using flow visualisation technique. Video images of the flow patterns were obtained by recording the progress of an acid-base reaction and analysed to determine the active and inactive volumes as a function of time. The doughnut-shaped inactive region formed above and below the impeller in low concentration simulant decreases in size with time and disappears finally. The 'cavern' shaped active mixing region formed around the impeller in simulant solutions with higher concentrations increases with increasing agitation time and reaches a steady state equilibrium size, which is a function of specific power input. These results indicate that the active volume is jointly determined by simulant rheology and specific power input. A mathematical correlation is proposed to estimate the active volume as a function of simulant concentration in terms of yield Reynolds number.
Publisher: Informa UK Limited
Date: 2018
DOI: 10.1252/JCEJ.17WE073
Publisher: Elsevier BV
Date: 12-2019
DOI: 10.1016/J.CHEMOSPHERE.2019.124488
Abstract: The adsorptive capability of rice-husk for the sorption of thorium ions from aqueous solutions in batch mode was studied. The key process variables (initial metal ion concentration, initial solution pH and S/L (solid-to-liquid ratio) were optimized for achieving maximum bioremoval efficiency (B%) by employing the Box-Behnken design (33) in response surface methodology (RSM). A quadratic model developed by fitting the experimental data predicted 93% of the responses and estimated the local maximum of B% as >99% for an initial ThIV concentration of 150 g/L, S/L ratio of 5, and an initial pH of 4, and the reported biosorption capacity (qe) is 15.95 mg/g for the same conditions. Freundlich isotherm (R
Publisher: Elsevier BV
Date: 09-2016
Publisher: Elsevier BV
Date: 02-2018
Publisher: Springer Science and Business Media LLC
Date: 11-2020
Publisher: Elsevier BV
Date: 2021
Publisher: Elsevier BV
Date: 02-2019
Publisher: American Chemical Society (ACS)
Date: 06-09-2021
Publisher: Elsevier BV
Date: 04-2010
Publisher: Elsevier BV
Date: 06-2016
Publisher: Wiley
Date: 29-11-2010
DOI: 10.1002/AIC.12468
Publisher: Elsevier BV
Date: 05-2018
Publisher: Elsevier BV
Date: 04-2018
Publisher: Elsevier BV
Date: 03-2022
Publisher: Springer Science and Business Media LLC
Date: 2008
Publisher: Elsevier BV
Date: 11-2016
Publisher: Elsevier BV
Date: 06-2014
DOI: 10.1016/J.WATRES.2014.02.048
Abstract: This study investigated the partially irreversible effect of thermal treatment on the rheology of digested sludge when it was subjected to temperature change between 20 °C and 80 °C and then cooled down to 20 °C. The yield stress, infinite viscosity and liquor viscosity of sludge were measured at 20 °C for different thermal histories and were compared to the evolution of the solubilised chemical oxygen demand (COD) of sludge liquor. The results showed that thermal history irreversibly affects sludge rheology as the yield stress of sludge which was heated to 80 °C then cooled down to 20 °C was 68% lower than the initial yield stress at 20 °C. This decrease was due to the irreversible solubilisation of solid matter during heating as underlined by soluble COD data which did not reach its original level after thermal treatment. Measured soluble COD of sludge which was heated and cooled down was much higher than the soluble COD of initial sludge. We found a proportionality of the increase of soluble COD with the decrease of the yield stress as well as increase of infinite viscosity.
Publisher: Elsevier BV
Date: 2023
Publisher: IOP Publishing
Date: 12-12-2018
Publisher: American Chemical Society (ACS)
Date: 18-11-2015
Publisher: Elsevier BV
Date: 11-2017
Publisher: Elsevier BV
Date: 07-2018
Publisher: Elsevier BV
Date: 08-2015
Publisher: Wiley
Date: 14-01-2017
DOI: 10.1002/EP.12534
Publisher: Springer Science and Business Media LLC
Date: 11-05-2017
Publisher: No publisher found
Date: 2022
Publisher: Elsevier BV
Date: 08-2015
Publisher: Elsevier BV
Date: 06-2019
Start Date: 04-2013
End Date: 03-2016
Amount: $250,000.00
Funder: Australian Research Council
View Funded Activity