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The performance of activated sludge exposed to arsanilic acid and amprolium hydrochloride in sequencing batch reactors

文献类型： 外文期刊

作者： Chen, Kui 1 ; Ji, Feng 2 ; Yuan, Shoujun 1 ; Hao, Wentao 3 ; Wang, Wei 1 ; Hu, Zhen-Hu 1 ;

作者机构： 1.Hefei Univ Technol, Sch Civil Engn, Hefei 230009, Peoples R China

2.Beijing Acad Agr & Forestry Sci, Inst Anim Husb & Vet Med, Beijing 100081, Peoples R China

3.Hefei Univ Technol, Sch Chem & Chem Engn, Hefei 230009, Peoples R China

4.Hefei Univ Technol, Inst Water Treatment & Wastes Reutilizat, Hefei 230009, Peoples R China

关键词： Activated sludge;Arsanilic acid (ASA);Amprolium hydrochloride (AMP);Nutrient removal

期刊名称：INTERNATIONAL BIODETERIORATION & BIODEGRADATION （ 影响因子：4.32； 五年影响因子：4.719 ）

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收录情况： SCI

摘要： Arsanilic add (ASA) and amprolium hydrochloride (AMP) are widely used as feed additives to control coccidial intestinal parasites and improve feed efficiency, but due to low metabolism most of the drugs are excreted by the animals unchanged and eventually end up in wastewaters. Little is known about the impacts of AMP and ASA on the performance of activate sludge in sequencing batch reactors (SBRs) as well as about their fate in wastewater treatment. In this study, the long-term performance of activated sludge in SBRs exposed to ASA and AMP was investigated. The COD removal and nitrification were not affected when the concentration of ASA or AMP was lower than 20 mg L-1, but were markedly inhibited at 100 mg L-1 of ASA or AMP. The inhibition to of COD removal was reversible whereas the inhibition to nitrification was irreversible. Phosphate removal was not affected by the continuous exposure to ASA or AMP. ASA and AMP were very resistant to be degraded by the activated sludge in SBRs, and only a small quantity of ASA was degraded to inorganic arsenic (no more than 300 mu g L-1) in the form of As (III) and As (V). (C) 2016 Elsevier Ltd. All rights reserved.

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