The performance of activated sludge exposed to arsanilic acid and Amprolium (cas 121-25-5) hydrochloride in sequencing batch reactors

Add time:09/24/2019    Source:sciencedirect.com

Arsanilic acid (ASA) and Amprolium (cas 121-25-5) 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 μg L−1) in the form of As (III) and As (V).

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