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UASB treatment of wastewater with VFA and alcohol generated during hydrogen fermentation of food waste

Paper ID Volume ID Publish Year Pages File Format Full-Text
36485 45133 2005 9 PDF Available
Title
UASB treatment of wastewater with VFA and alcohol generated during hydrogen fermentation of food waste
Abstract

The performance of an upflow anaerobic sludge blanket (UASB) reactor treating wastewater with volatile fatty acids (VFA) and alcohol generated during hydrogen fermentation of food waste was investigated. The chemical oxygen demand (COD) removal efficiency exceeded 96% up to the loading rates of 12.9 g COD/L d, corresponding to a food/microorganism ratio of 0.61 g COD/g VSS d. The methane production rate increased to 4.1 L/L d. Each gram of granule in the reactor had a daily maximum capacity of converting 0.55 g of COD to methane at the specific substrate utilization rate of 0.59 g COD/g VSS d. Of all the COD removed, 93% was converted to methane and the remaining presumably to biomass with a yield of 0.051 g VSS/g COD. At loading rates over 15.3 g COD/L d, the COD removal efficiency deteriorated due to sludge flotation and washout in the reactor, which resulted from short hydraulic retention time (HRT) of less than 5.8 h. The specific methanogenic activity (SMA) of granule was the highest for butyrate, and the lowest for propionate. Methanosaeta-like bamboo-shaped rods were present in abundance.

Keywords
UASB reactor; Methanogenic activity; VFA; Alcohol; Hydrogen fermentation; Food waste
First Page Preview
UASB treatment of wastewater with VFA and alcohol generated during hydrogen fermentation of food waste
Publisher
Database: Elsevier - ScienceDirect
Journal: Process Biochemistry - Volume 40, Issue 8, July 2005, Pages 2897–2905
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering