ORCID Profile
0000-0002-6217-1820
Current Organisation
KU Leuven
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Wastewater treatment processes | Water treatment processes | Chemical engineering not elsewhere classified | Chemical engineering
Publisher: Elsevier BV
Date: 02-2023
Publisher: Elsevier BV
Date: 11-2019
DOI: 10.1016/J.WATRES.2019.114998
Abstract: Algal-derived organic matter (AOM) from algal blooms in water supply systems contains dissolved organic nitrogen (DON) and dissolved organic carbon (DOC) among other constituents. The DON and DOC are disinfection by-product (DBP) precursor compounds, and must be well characterised to facilitate effective removal, thus minimising DBP formation during disinfection. While DOC character has been studied extensively, DON analysis suffers from inaccuracies due to s le pre-treatment and instrument sensitivities. A liquid chromatography method that combines size exclusion chromatography with highly sensitive organic carbon and nitrogen detectors (LC-OCND) has been widely adopted for DOC analysis however, its potential for application for DON charactersation has been suggested as a viable alternative to existing DON characterisation techniquesnot been assessed despite its potential. Hence, the aim was to compare the effectiveness of conventional total dissolved N-dissolved inorganic N (TN-DIN), and LC-OCND methods for analysing DON in AOM. A suite of N-containing model compounds representative of DON and AOM extracted from Chlorella vulgaris CS-42/7 and Microcystis aeruginosa CS-555/1 were used to evaluate the techniques. The DON of both model compounds and AOM was first analysed using the conventional method and, then, via LC-OCND. It was observed that LC-OCND had a better precision for DON when TN contained more DIN. LC-OCND provided direct quantitative measurements for bulk and fractionated DON and DIN, with little interference caused by DIN. Additionally, LC-OCND provided information on MW distribution and protein content of the AOM. For ex le, LC-OCND results showed that M. aeruginosa AOM contained more HMW material than C. vulgaris AOM. However, as LC-OCND uses UV oxidation, it could not completely oxidise complex aromatic structures, and thus had a lower recovery for HMW model compounds and algal DON in comparison to the conventional method that used high temperature catalytic oxidation. Overall, it is advised that a combination of LC-OCND and TN analysis be used to provide a more detailed characterisation of N-containing AOM and other similar HMW aquatic NOM s les.
Publisher: Elsevier BV
Date: 04-2023
Publisher: Elsevier BV
Date: 2023
Publisher: Elsevier BV
Date: 04-2023
Publisher: Elsevier BV
Date: 04-2023
Publisher: Royal Society of Chemistry (RSC)
Date: 2022
DOI: 10.1039/D2EW00416J
Abstract: Systematic evaluation of seven oxidant combinations for pre and post coagulation in direct filtration provides guidance on maximising NOM and manganese removal without increasing DBP formation.
Publisher: Elsevier BV
Date: 09-2020
Publisher: Elsevier BV
Date: 10-2021
Publisher: Royal Society of Chemistry (RSC)
Date: 2019
DOI: 10.1039/C8EW00731D
Abstract: Fluorescence based characterisation of the algal organic matter, when combined with cell pigmentation measurements, may improve the specificity and robustness of online fluorometers.
Publisher: Royal Society of Chemistry (RSC)
Date: 2020
DOI: 10.1039/D0EW00149J
Abstract: Removal of dissolved organic matter fractions via three different treatment processes.
Publisher: Elsevier BV
Date: 07-2020
Publisher: Royal Society of Chemistry (RSC)
Date: 2022
DOI: 10.1039/D1EW00831E
Abstract: FEEM and LC-OCD characterisation supplemented with an understanding of protein morphology, hydrophobicity and charge lends insights into protein fouling behaviour.
Publisher: Elsevier BV
Date: 02-2021
Publisher: Elsevier BV
Date: 06-2021
Publisher: Elsevier
Date: 2022
Publisher: IWA Publishing
Date: 09-05-2022
Abstract: In this work, a commercially available water treatment polymer poly(N,N-diallyl-N,N-dimethylammonium chloride) (PDADMAC) and a hydrophobically modified polymer (HMP) designed to adhere to bubble surfaces were applied for the first time in the novel Posi-dissolved air flotation process (PosiDAF) that uses polymer-modified bubbles, at pilot-scale for the treatment of waste stabilisation pond s les rich in algae. It was found that PDADMAC in PosiDAF gave comparable removal to that achieved using conventional DAF at & % cell separation. Furthermore, the float layer was more uniform and thicker with up to 8% solid contents compared to conventional DAF, which comprised discrete floc clusters with an average solid concentration of ∼4.1%. In contrast to the use of PDADMAC, the application of the HMP did not achieve similarly good separation at pilot scale. It was hypothesised that this may be due to the micellisation of the HMP on the bubble surface, creating unstable bubbles that coalesced and prevented polymer–bubble–cell interactions, which are crucial for effective cell separation. On comparison of the costs of PosiDAF and conventional DAF, it was found that PosiDAF resulted in cost-savings of up to 74% due to low chemical consumption. In summary, PosiDAF reduced chemical cost and increased solid contents in the metal-free float.
Publisher: Elsevier BV
Date: 12-2022
Start Date: 03-2024
End Date: 03-2027
Amount: $402,287.00
Funder: Australian Research Council
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