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A pilot plant and anaerobic digestion process for raisin finishing wastewater treatment

A pilot plant and anaerobic digestion process for raisin finishing wastewater treatment

Biological Wastes 22(2): 129-138

A process and pilot plant, utilizing raisin-finishing wastewater, are described. The wastewater contains invert sugar and SO32- (0.8-3.0 g litre-1) as pollutants. The process is a continuous anaerobic digestion of the wastewater. The bacteria were mainly immunobilized in the reactor on a large surface area of plastic support media. For best performance of this upflow anaerobic biofilter, sulfites were removed with lime prior to fermentation. High sulfite concentrations in the initial wastewater did not then cause significant inhibition. Removal of COD from lime-treated influent to the reactor was over 90% for loadings up to 13 kg COD per cubic metre of initial reactor volume per day. To determine the purification of wastewater at different flow rates and COD loadings, determinations of BOD5, COD, SO42-,SO42-,S2- in the influent and effluent were made. Volatile Fatty Acids (VFA) in the reactor and the composition of biogas are also reported.

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Accession: 001740633

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DOI: 10.1016/0269-7483(87)90045-0

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