Journal of Microbiology and Biotechnology

The Korean Society for Microbiology and Biotechnology (한국미생물·생명공학회)
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Effects of Volatile Solid Concentration and Mixing Ratio on Hydrogen Production by Co-Digesting Molasses Wastewater and Sewage Sludge

  • Lee, Jung-Yeol (Global Top 5 Research Program, Ewha Womans University) ;
  • Wee, Daehyun (Global Top 5 Research Program, Ewha Womans University) ;
  • Cho, Kyung-Suk (Global Top 5 Research Program, Ewha Womans University)
  • Received : 2014.02.17
  • Accepted : 2014.07.19
  • Published : 2014.11.28
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Abstract

Co-digesting molasses wastewater and sewage sludge was evaluated for hydrogen production by response surface methodology (RSM). Batch experiments in accordance with various dilution ratios (40- to 5-fold) and waste mixing composition ratios (100:0, 80:20, 60:40, 40:60, 20:80, and 0:100, on a volume basis) were conducted. Volatile solid (VS) concentration strongly affected the hydrogen production rate and yield compared with the waste mixing ratio. The specific hydrogen production rate was predicted to be optimal when the VS concentration ranged from 10 to 12 g/l at all the mixing ratios of molasses wastewater and sewage sludge. A hydrogen yield of over 50 ml $H_2/gVS_{removed}$ was obtained from mixed waste of 10% sewage sludge and 10 g/l VS (about 10-fold dilution ratio). The optimal chemical oxygen demand/total nitrogen ratio for co-digesting molasses wastewater and sewage sludge was between 250 and 300 with a hydrogen yield above 20 ml $H_2/gVS_{removed}$.

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