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Development and characteristics of rapidly formed hydrogen-producing granules in an acidic anaerobic sequencing batch reactor (AnSBR)

Paper ID Volume ID Publish Year Pages File Format Full-Text
4104 208 2010 7 PDF Available
Title
Development and characteristics of rapidly formed hydrogen-producing granules in an acidic anaerobic sequencing batch reactor (AnSBR)
Abstract

This study investigated the development and characteristics of rapidly formed hydrogen-producing granules (HPGs) in an acidic anaerobic sequencing batch reactor (AnSBR). When subjecting the AnSBR suspended sludge to heat-shock (80 °C for 20 min) and acidic pretreatment (pH 2.0 for 24 h) subsequently, granules were formed within the first 10 days of the AnSBR operation at pH 5.5. After subsequent second time heat-shock of the granules on day 35, hydrogen yield increased significantly to 1.36 mol-H2/mol-glucose with a headspace content of 65 ± 7% and was stable during the next 60 days running of the AnSBR. A typical mature HPG showed 1.7 ± 0.2 mm in diameter and had an average settling velocity of 43 m/h. The granules were comprised of uniform rod shaped bacteria with a non-layered structure and multiple cracks on the surface. Three pure cultures, Clostridium sp. HP2, HP4 and HP7, were obtained from the enriched HPGs. Among the three isolates, strain HP4 showed the highest hydrogen yield of 1.41 (mol-H2/mol-glucose) at a rate of 0.85 L-H2/L/day (34.5 mmol-H2/L/day). This study suggests that acid pretreatment, combining with the short settling time (30 min) and large exchange ratio (60%) of effluent, is applicable for rapid formation of HPGs in the AnSBR, which provides a promising approach for biological hydrogen production from the organic wastewater.

Keywords
Biogas; Bio-hydrogen; Biofuel; Activated sludge; Hydrogen-producing granules; AnSBR
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Development and characteristics of rapidly formed hydrogen-producing granules in an acidic anaerobic sequencing batch reactor (AnSBR)
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Publisher
Database: Elsevier - ScienceDirect
Journal: Biochemical Engineering Journal - Volume 49, Issue 1, 15 March 2010, Pages 119–125
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us