Abstract

Multi-phase anaerobic reactor for H2 and CH4 production from paperboard mill wastewater was studied. The reactor was operated at hydraulic retention times (HRTs) of 12, 18, 24, and 36h, and organic loading rates (OLRs) of 2.2, 1.5, 1.1, and 0.75kgchemical oxygen demand (COD)/m3day, respectively. HRT of 12h and OLR of 2.2kgCOD/m3day provided maximum hydrogen yield of 42.76 ± 14.5ml/gCODremoved and volumetric substrate uptake rate (-rS) of 16.51 ± 4.43mgCOD/Lh. This corresponded to the highest soluble COD/total COD (SCOD/TCOD) ratio of 56.25 ± 3.3% and the maximum volatile fatty acid (VFA) yield (YVFA) of 0.21 ± 0.03gVFA/gCOD, confirming that H2 was mainly produced through SCOD conversion. The highest methane yield (18.78 ± 3.8ml/gCODremoved) and -rS of 21.74 ± 1.34mgCOD/Lh were achieved at an HRT of 36h and OLR of 0.75kgCOD/m3day. The maximum hydrogen production rate (HPR) and methane production rate (MPR) were achieved at carbon to nitrogen (C/N) ratio of 47.9 and 14.3, respectively. This implies the important effect of C/N ratio on the distinction between the dominant microorganism bioactivities responsible for H2 and CH4 production.

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