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      Salt-tolerant Microbiota Enhancing Contaminants Removal from Mariculture Wastewater Containing Sulfamethoxazole in an A/O-MBBR

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          The wide application of antibiotics in aquaculture requires an efficient treatment of the wastewater before discharging it into the environment. During the wastewater treatment, the influence of antibiotics on the performance of bioreactor should be well revealed due to their toxicity to the functional microbial community. In this study, the effect of feeding 10–30 mg L –1 sulfamethoxazole (SMX) in influent on the performance of an anoxic/oxic-moving bed biofilm reactor (A/O-MBBR) treating mariculture wastewater and the responding change of biofilm microbial communities was investigated. The COD average removal rate remained at 94.61%–97.34% with the dosage of SMX. Compared with that, the nitrifying removals of NH 4 +-N and NO 2 -N were violently inhibited by 30 mg L –1 SMX and denitrifying removal of the NO 3 -N decreased obviously with 20 mg L –1 or more SMX. The microbial community in the successful startup bioreactor was relatively abundant, while the diversity of microbial community decreased with the increase of feeding SMX. The salt-tolerant and SMX-resistant genera Arcobacter, Thiothrix, Desulfuromusa and Nitrosomonas were gradually enriched and finally played a vital role in converting COD and recycling nitrogen and sulfur. Hence, the present A/O-MBBR reactor with the salt-tolerant functional microbiota achieved efficient removal of pollutants in the presence of low concentration ( e.g., 10 mg L –1) SMX.

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          Author and article information

          Journal of Ocean University of China
          Science Press and Springer (China )
          10 July 2020
          01 August 2020
          : 19
          : 4
          : 865-873
          1Shandong Provincial Key Laboratory of Marine Environment and Geological Engineering (MEGE), College of Environmental Science and Engineering, Ocean University of China, Qingdao 266100, China
          2Key Laboratory of Marine Environment and Ecology (Ocean University of China), Ministry of Education, Qingdao 266100, China
          Author notes
          *Corresponding author: ZHAO Yangguo, E-mail: ygzhao@
          Copyright © Ocean University of China, Science Press and Springer-Verlag GmbH Germany 2020.

          The copyright to this article, including any graphic elements therein (e.g. illustrations, charts, moving images), is hereby assigned for good and valuable consideration to the editorial office of Journal of Ocean University of China, Science Press and Springer effective if and when the article is accepted for publication and to the extent assignable if assignability is restricted for by applicable law or regulations (e.g. for U.S. government or crown employees).

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