Journal
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
Volume 33, Issue 21, Pages 6133-6142Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ijhydene.2008.07.096
Keywords
Biohydrogen; Attached growth; Acidophilic; Wastewater treatment; Metabolic volatile intermediates
Categories
Funding
- Department of Biotechnology (DBT), Government of India [BT/PR/4405/BCE/08/312/2003]
- council of scientific and industrial research (CSIR), New Delhi
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The influence of self-immobilization of enriched acidogenic mixed consortia on fermentative hydrogen (H-2) production was studied on different supporting materials [SBA-15 (mesoporous) and activated carbon (granular; GAC and powder; PAC)] using chemical wastewater as substrate. Batch fermentation experiments were performed with same substrate at different organic loading rates (OLRs) under acidophilic microenvironment (pH 5.5) and room temperature (28 +/- 2 degrees C). Experimental data evidenced the effectiveness of attached growth on both the H-2 yields and substrate degradation efficiency, particularly at higher loading rates. Among the three materials evaluated, immobilization on SBA-15 material showed comparatively effective performance in enhancing both H-2 yield and substrate degradation. Suspended growth (SG-control) culture showed inhibition in terms of both H-2 production and substrate degradation especially at applied higher loading rates. Immobilization on SBA-15 resulted in nine times higher H-2 production (7.29 mol/kg CODR-day at OLR of 0.83 kg COD/m(3)-day) than the lowest yield observed (suspended growth at OLR of 2.55 kg COD/m(3)-day). Maximum substrate degradation rate (SDR) of 0.96 kg COD/m(3)-day (OLR 2.55 kg COD/m(3)-day) was also observed with SBA-15 immobilization, which is 1.62 times higher than the lowest substrate degradation observed with SG-control experiments with the same OLR. Attached growth on GAC and PAC also showed remarkable improvement in the process performance at higher OLRs compared to SG-control. (C) 2008 International Association for Hydrogen Energy. Published by Elsevier Ltd. All rights reserved.
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