Inhibitory effect of released phosphate on the ability of nano zero valent iron to boost anaerobic digestion of waste-activated sludge and the remediation method

产甲烷 零价铁 磷酸盐 厌氧消化 化学 活性污泥 环境修复 甲烷菌 生物强化 甲烷八叠球菌 吸附 废水 环境化学 无氧运动 甲烷 细菌 废物管理 生物化学 生物修复 污染 生态学 有机化学 生物 工程类 遗传学 生理学
作者
Hui Xu,Yanbiao Liu,Bo Yang,Lijuan Jia,Xiang Li,Fang Li,Xinshan Song,Xin Cao,Wolfgang Sand
出处
期刊:Chemical Engineering Journal [Elsevier BV]
卷期号:405: 126506-126506 被引量:15
标识
DOI:10.1016/j.cej.2020.126506
摘要

The addition of nano zero valent iron (NZVI) to anaerobic systems is an attractive strategy to enhance the anaerobic digestion (AD) of waste-activated sludge (WAS). However, high minerals contents within the WAS may release inorganic salts and regenerate precipitates in AD, leading to changes in the morphology of the sludge and affecting mass transfer between syntrophic bacteria and methanogens. In this study, the addition of NZVI was found to significantly accelerate CH4 production early in the AD process of WAS. With continuous AD, the internal channels of the anaerobic granular sludge (AGS), which are crucial for mass transfer, were clogged by phosphate precipitates that were formed due to the reaction between Fe2+ and PO43− released from phosphorus-containing minerals in WAS. This caused a decrease in CH4 production. The combination of NZVI and granular activated carbon (GAC) reduced the production of phosphate precipitates due to the adsorption on Fe2+ by GAC; this mitigated the inhibitory effect of phosphate precipitates on CH4 production. Additionally, there was a sharp increase in genes involved in hydrogenotrophic methanogenesis in the NZVI and GAC + NZVI groups, while there was no significant change in the genes involved in acetoclastic methanogenesis in the NZVI group compared to the control group. The formation of H2 and the direct release of electrons from NZVI corrosion, which boost CH4 production, occurred simultaneously. This study is the first detailed investigation into the mechanisms underlying the inhibition and bioaugmentation effects of NZVI on AD of WAS in a complex system.
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