Philip Antwi
Harbin Institute of Technology,China
Title: Enhanced biomethanation in potato starch processing wastewater by digestion with zero valent iron: Impacts on methanation, process kinetics and microbial community shift
Biography
Biography: Philip Antwi
Abstract
Zero valent iron (Feº) was employed in potato starch processing wastewater digestion and the hydrolysis-acidification step, biomethane potential, microbial community distribution and related process kinetics were evaluated. Compared to non Feº dosed reactors, COD removal reached 97.51%. Notably, methane potential which increased by 64.7% could reach about 630.6 mLCH4/gVSSadded when 10 g/L ZVI was applied. Modified Gompertz model exhibited smaller deviations (2.3%–4.4%) from experimental values as oppose to first-order kinetic model (8.27%–11.79%). Lag phase (Æ›) obtained in batch assays R1, R2, R3, R4 and R5 were 6.24, 5.62, 4.46, 4.20, 4.59 days, respectively, indicating faster degradability in ZVI charged reactors. 32 different phyla and 163 different families were observed. Dominant phyla observed were Chloroflexi, Euryarchaeota and Spirochaetes, Firmicutes, Bacteroidetes, Synergistetes, Proteobacteria and Caldiserica. ZVI addition is suggested to have had impact on the biodegradability rate, methane potential and microbial community shift that is favorable to methane generation.