Response of simultaneous nitrification-denitrification to DO increments in continuously aerated biofilm reactors for aquaculture wastewater treatment

文献类型： 外文期刊

第一作者： Zhang, Shiyang

作者： Zhang, Shiyang;Chen, Jing;Yuan, Julin;Wang, Guangjun

作者机构：

关键词： aquaculture wastewater; biofilm reactor; continuous aeration; dissolved oxygen; percent removal; simultaneous nitrification-denitrification

期刊名称：WATER PRACTICE AND TECHNOLOGY （ 影响因子：1.6； 五年影响因子：1.4 ）

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年卷期： 2021 年 16 卷 4 期

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收录情况： SCI

摘要： Intensive aquaculture usually produces large volumes of nutrient-rich wastewater, which is essential to treat to avoid eutrophication. This study aimed to evaluate the performance of five, continuously aerated, biofilm reactors treating simulated, high-strength, aquaculture wastewater under different dissolved oxygen (DO) levels, and the effects of DO increments on simultaneous nitrification-denitrification (SND). Continuous aeration was beneficial to complete nitrification. Total inorganic nitrogen (TIN), principally ammonium, was mainly removed by SND. The SND rate response to different DO levels was fitted well by the power function of y = 54.81 + 371.58/(1 - 0.16*x)(boolean AND)(-1/0.24) (R-2 = 0.897, P = 0.000). When the TIN was removed completely, the optimal SND rate was defined and corresponded to a value of 121.8%. Accordingly, the optimal DO concentration was calculated as 2.10 mg/L, close to the actual level of 1.83 mg/L, at which the highest proportional removals of total nitrogen (58.0%) and TIN (57.3%) were obtained. Phosphorus was also removed by denitrifying polyphosphate-accumulating organisms.

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