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Published on: December 19, 2017
Enhancing anaerobic digestion of sulphate wastewater by adding nano-zero valent iron
Jiacheng Liu1, Yongyu Ding1, Wen Qiu1
1School of Chemical and Environmental Engineering, Wuhan Polytechnic University, Wuhan, People's Republic of China.
Abstract:
In this paper, the effects of nano-zero valent iron (nZVI) on anaerobic digestion of sulphate wastewater with different /COD ratios, including the COD removal rate, methane yield, intermediate products and the change of microbial community structure, were investigated. The results showed that nZVI could effectively enhance the treatment efficiency and methane yield. Compared with the control group without nZVI, the methane yield increased from 348.6833 to 1007.05 mL CH4/gCODremoval with 4 g nZVI loading at /COD = 0.1. nZVI could make electron flow from sulphate reduction to methane production, which increased methane yield even at high sulphate concentration. The microbial community analysis showed that adding nZVI could increase the abundance of acetoclastic methanogens, which accelerated hydrolysis acidification.
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