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• W4378800957 endingPage "103833" @default.
• W4378800957 startingPage "103833" @default.
• W4378800957 abstract "This study examined the anaerobic degradation of technical-hexachlorocyclohexane (t-HCH)-a persistent organic pollutant (POP), using a batch reactor and the influence of pH, active biomass as volatile suspended solids (VSS), total suspended solids, total organic carbon, chloride release, and elemental composition on an Upflow Anaerobic Sludge Blanket (UASB) reactor start-up. Chloride release, a direct indicator of HCH degradation, was measured to confirm the process. During the initial sludge acclimatization, only 49.23 % degradation efficiency was seen after 45 days with an initial concentration of 1.0 g l−1. However, when electron donors and co-substrates were added to the sludge, the degradation time was shortened to 15 days with an increase in efficiency up to 60.17 %. When this adapted sludge was taken in a UASB reactor start up at 100 mg l−1 HCH, this degradation effectiveness was significantly improved when organic loading rate (OLR) was decreased to 50 mg l−1 d−1 assuming 48 h hydraulic retention time (HRT) in a UASB reactor start up at 100 mg l−1 HCH. During the original UASB reactor start-up, 92.37 %, 90.64 %, 85.72 %, and 83.26 % degradation of the alpha, gamma, beta, and delta isomers, with evidence of pentachlorocyclohexene as a transitory intermediate was observed. The major determining variables for reactor start-up were found to be neutral pH, mesophilic temperature, addition of co-substrate (glucose), VSS, HRT, and OLR. The study's innovation is that it examines the efficacy of the degradation process during sludge acclimatization and gives useful details about the variables to consider when starting up a UASB reactor. This research gives a biodegradation trend, which may be required before venturing for anaerobic degradation of recalcitrant substances like t-HCH." @default.
• W4378800957 created "2023-06-01" @default.
• W4378800957 creator A5048216168 @default.
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• W4378800957 date "2023-07-01" @default.
• W4378800957 modified "2023-09-29" @default.
• W4378800957 title "Anaerobic degradation of hexachlorocyclohexane: Factors influencing the reactor start-up" @default.
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• W4378800957 doi "https://doi.org/10.1016/j.jwpe.2023.103833" @default.
• W4378800957 hasPublicationYear "2023" @default.
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