Impact of roxarsone on the UASB reactor performance and its degradation

文献类型： 外文期刊

第一作者： Shui, Mengchuan

作者： Shui, Mengchuan;Tang, Rui;Yuan, Shoujun;Wang, Wei;Hu, Zhenhu;Ji, Feng;Zhan, Xinmin;Wang, Wei;Hu, Zhenhu

作者机构：

关键词： Anaerobic digestion;Anaerobic granular sludge (AGS);Arsenic species;Impact;Roxarsone (ROX);UASB reactor

期刊名称：FRONTIERS OF ENVIRONMENTAL SCIENCE & ENGINEERING （ 影响因子：4.357； 五年影响因子：3.688 ）

ISSN： 2095-2201

年卷期： 2016 年 10 卷 6 期

页码：

收录情况： SCI

摘要： Roxarsone (3-nitro-4-hydroxyphenylarsonic acid, ROX) has been widely used for decades as an organoarsenic feed additive to control intestinal parasites and improve feed efficiency in animal production. However, most of the ROX is excreted into the manure, causing arsenic contamination in wastewater. The arsenic compounds are toxic to microorganisms, but the influence of continuous ROX loading on upflow anaerobic sludge blanket (UASB) reactor is still unknown. In this study, the impact of ROX and its degradation products on the performance of the UASB reactor and the degradation and speciation of ROX in the reactor were investigated. The UASB reactor (hydraulic retention time: 1.75 d) was operated using synthetic wastewater supplemented with ROX for a period of 260 days. With continuous ROX addition at 25.0 mg.L-1, severe inhibition to methanogenic activity occurred after 87 days operation accompanied with an accumulation of volatile fatty acids (VFAs) and a decline in pH. The decrease of added ROX concentration to 13.2 mg.L-1 did not mediate the inhibition. As(III), As (V), MMA(V), DMA(V), HAPA and an unknown arsenic compound were detected in the reactor, and a possible biotransformation pathway of ROX was proposed. Mass balance analysis of arsenic indicated that 60%-70% of the arsenic was discharged into the effluent, and 30%-40% was precipitated in the reactor. The results from this study suggest that we need to pay attention to the stability in the UASB reactors treating organoarsenic-contaminated manure and wastewater, and the effluent and sludge from the reactor to avoid diffusion of arsenic contamination. (C) Higher Education Press and Springer-Verlag Berlin Heidelberg 2016

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