Emerging investigator series: control of membrane fouling by dissolved algal organic matter using pre-oxidation with coagulation as seawater pretreatment

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dc.contributor.author Deka, Bhaskar Jyoti
dc.contributor.author Guo, Jiaxin
dc.contributor.author Jeong, Sanghyun
dc.contributor.author Kumar, Manish
dc.contributor.author An, Alicia Kyoungjin
dc.date.accessioned 2020-03-12T08:51:46Z
dc.date.available 2020-03-12T08:51:46Z
dc.date.issued 2020-01
dc.identifier.citation Deka, Bhaskar Jyoti; Guo, Jiaxin; Jeong, Sanghyun; Kumar, Manish and An, Alicia Kyoungjin, “Emerging investigator series: control of membrane fouling by dissolved algal organic matter using pre-oxidation with coagulation as seawater pretreatment”, Environmental Science: Water Research & Technology, DOI: 10.1039/C9EW00955H, vol. 6, no. 4, pp. 935-944, Jan. 2020. en_US
dc.identifier.issn 2053-1400
dc.identifier.uri https://doi.org/10.1039/C9EW00955H
dc.identifier.uri https://repository.iitgn.ac.in/handle/123456789/5223
dc.description.abstract Marine algae produce organic matter, namely algal organic matter (AOM), especially during a harmful algal bloom. AOM has been recognised as a key cause for the formation of organic fouling on membranes in seawater desalination applications. In this study, pre-oxidation of AOM by potassium permanganate (KMnO4) and sodium hypochlorite (NaOCl) was investigated. In addition, ferric (Fe3+) and alum (Al3+) coagulants were used for subsequent coagulation. Two different operational modes, conventional coagulation�flocculation�sedimentation (CFS) and coagulation�flocculation-dissolved air flotation (CF-DAF) processes, were used to evaluate pretreatment performance using synthetic AOM with an initial dissolved organic carbon (DOC) of around 4.8 mg C L?1 (turbidity ? 4.47 NTU, pH ? 8). Pre-oxidation with coagulation removed more AOM, compared to oxidation or coagulation alone. The removal of DOC by NaOCl�Fe3+ is relatively high when compared to other combinations of oxidant and coagulant because of in situ ferrate (Fe6+) generation, which was detected by the ABTS (2,2?-azino-bis(3-ethylbenzothiazoline-6-sulfonic acid))-ultraviolet visible (UV-vis) method. Pre-oxidation with 1.5 mg L?1 NaOCl followed by coagulation with 2.5�3.0 mg L?1 Fe3+ achieved a maximum DOC removal of 65�76% during the CFS treatment; while, the DOC removal could further increase up to 83�85% by introducing CF-DAF. Particularly, the NaOCl�Fe3+ treatment generated 1.31 mg L?1 of in situ ferrate (Fe6+). Finally, pre-oxidation and coagulation coupled with DAF successfully reduced fouling and lowered flux decline in a microfiltration (MF) membrane. Non-invasive optical coherence tomography (OCT) was performed to monitor the fouling development on the MF membrane before and after pretreatment.
dc.description.statementofresponsibility by Bhaskar Jyoti Deka, Jiaxin Guo, Sanghyun Jeong, Manish Kumar and Alicia Kyoungjin An
dc.language.iso en_US en_US
dc.publisher Royal Society of Chemistry en_US
dc.title Emerging investigator series: control of membrane fouling by dissolved algal organic matter using pre-oxidation with coagulation as seawater pretreatment en_US
dc.type Article en_US
dc.relation.journal Environmental Science: Water Research & Technology


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