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Optimization of continuous hydrogen fermentation of food waste as a function of solids retention time independent of hydraulic retention time

Paper ID Volume ID Publish Year Pages File Format Full-Text
35595 45097 2008 6 PDF Available
Title
Optimization of continuous hydrogen fermentation of food waste as a function of solids retention time independent of hydraulic retention time
Abstract

Four anaerobic sequencing batch reactors (ASBRs) were used for hydrogen fermentation and fed with food waste (4.4 ± 0.2% volatile solids (VS) containing 27 g carbohydrate-COD/L). The aim of this study was to investigate the effects of solids retention time (SRT) in the range 24–160 h and hydraulic retention time (HRT) in the range 24–42 h. Achieving high SRT independent of HRT with internal sludge retention contributed to higher H2 production than in previous studies using continuous stirred-tank reactor systems. The maximum H2 production rate of 2.73 L H2/(L d) was estimated at an SRT of 126 h and HRT of 30 h, while the maximum H2 yield of 80.9 mL H2/g VS (1.12 mol H2/mol hexoseadded) occurred at an SRT of 126 h and HRT of 33 h. Furthermore, hydrogen fermentation facilitated organic acid conversion, alcohol conversion, and volatile suspended solid removal with efficiencies ranging from 29.6 to 46.3%, 4.1 to 14.6%, and 54.9 to 75.8%, respectively, which were comparable to conventional acidogenic fermentation without H2 production.

Keywords
Hydrogen fermentation; Food waste; Solids retention time (SRT); Hydraulic retention time (HRT); Anaerobic sequencing batch reactor (ASBR)
First Page Preview
Optimization of continuous hydrogen fermentation of food waste as a function of solids retention time independent of hydraulic retention time
Publisher
Database: Elsevier - ScienceDirect
Journal: Process Biochemistry - Volume 43, Issue 2, February 2008, Pages 213–218
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering