Effect of Zinc oxide nanoparticles on anaerobic digestion of excess activated sludge
WANG Shu-tao1, CHEN Ling-bo1, ZHANG Zhen-rui1, WU Chuan1, JIANG Rui2, YOU Hong1
1. State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, Harbin 150090, China;
2. Heilongjiang Research Academy of Environmental Sciences, Harbin 150056, China
The impact of Zinc oxide nanoparticles (ZnO-NPs) (0, 2, 30, 60, 90, 120 and 150mg/g-VSS) on the anaerobic digestion of excess activated sludge was investigated and the possible dose-effect relationship was achieved. Results indicated that less adverse effects of ZnO-NPs were found on anaerobic digestion of excess activated sludge at the low exposure concentration (2mg/g-VSS). However, significant effects were observed on the anaerobic digestion including biogas production, degradation efficiency of organics as well as reduction rate of sludge, but no significant effects was found on the volatile fatty acids (VFAs). The average daily gas production plummeted when the exposure concentration of ZnO-NPs was increased from 30mg/g-VSS to 120mg/g-VSS, but no obvious decrease of daily gas production was observed as the concentration was increased from 120mg/g-VSS to 150mg/g-VSS. In additon, ZnO-NPs could significantly inhibit the degradation efficiency of organic matter and the sludge reduction rate, and with the increasing of ZnO-NPs concentration from 30mg/g-VSS to 120mg/g-VSS, soluble chemical oxygen demand (SCOD) removal rate, total chemical oxygen demand (TCOD) removal rate and R(VSS/TSS) value was decreased to 3%, 36.5% and 74% of the control. Sludge reduction rate was reduced from 23% to 4.8% of the control when the ZnO-NPs concentration increased from 2mg/g-VSS to 150mg/g-VSS. The results help evaluating the inhibitory effects of nanoparticles on anaerobic digestion process.
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