Effect of pH, ORP and Influent COD on Hydrogen Content in Fermentative Hydrogen Production
Fermentative hydrogen production was carried out using a continuous flow stirred tank reactor (CSTR) for the investigation of the hydrogen content in the biogas. Molasses was used as the substrate; hydraulic retention time (HRT) was 6 h; the temperature was in the range of 35±1 .It was showed that hydrogen content increased from 38% to 59% when pH decreased from 5 to 4.6 with oxidation-reduction potential (ORP) increased from -420 mV to -380 mV. The hydrogen content dropped from 50% to 30% as influent COD was improved from4000 mg/L to 6000 mg/L. Hydrogen content increased to 35% when influent COD was improved to 7000 mg/L, however decreased to 25% when influent COD was 8000 mg/L. Ethanol in terminal products is accompanied with hydrogen production but with lower hydrogen content. Butyric acid indicates higher hydrogen content than ethanol.
Jingtao Han, Zhengyi Jiang and Sihai Jiao
L. L. Zhu et al., "Effect of pH, ORP and Influent COD on Hydrogen Content in Fermentative Hydrogen Production", Advanced Materials Research, Vols. 156-157, pp. 877-881, 2011