Study of HRT, CRT, and Biomass Renovation in Fungal Sequencing Batch Aerobic Reactor for Decolorization of Distillery Spentwash
Publication: Journal of Hazardous, Toxic, and Radioactive Waste
Volume 18, Issue 2
Abstract
Decolorization of anaerobically digested and polyaluminium chloride (PAC) treated distillery spentwash was studied in a fungal sequencing batch aerobic reactor (FSBAR). Pellets of isolated Aspergillus niger IITB-V8 species were used in the experiments. In continuous/sequencing batch reactors, decolorization of distillery spentwash cannot be maintained for a longer duration as efficiency decreases after 5–6 days; therefore, effects of hydraulic retention time (HRT), cellular retention time (CRT), and biomass renovation on the decolorization were studied in FSBAR. The HRT for maximum decolorization of 69% was found out to be 2.5 days while the optimum CRT for maximum decolorization of 69% was obtained as 7.5 days. But at this CRT also, maximum decolorization could not be maintained after 7.5 days. Decrease in decolorization was observed due to change in fungal pellet morphology over time. Biomass renovations were undertaken to maintain satisfactory decolorization percentages for a longer period (30 days) and it was found that partial biomass renovation () every 2.5 days resulted in consistent decolorization of 69% with overall decolorization of 87%.
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Published In
Journal of Hazardous, Toxic, and Radioactive Waste
Volume 18 • Issue 2 • April 2014
Copyright
© 2014 American Society of Civil Engineers.
History
Received: Nov 8, 2012
Accepted: Mar 27, 2013
Published online: Apr 4, 2013
Published in print: Apr 1, 2014
Discussion open until: Jun 9, 2014
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