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
作者： Zhang, Shiyang 1 ; Chen, Jing 1 ; Yuan, Julin 2 ; Wang, Guangjun 3 ;
作者机构： 1.Wuhan Univ Technol, Sch Civil Engn & Architecture, Wuhan 430070, Peoples R China
2.Zhejiang Inst Freshwater Fisheries, Agr Minist, Key Lab Fish Hlth & Nutr Zhejiang Prov, Key Lab Hlth Freshwater Aquaculture, Huzhou 313001, Peoples R China
3.Chinese Acad Fishery Sci, Pearl River Fisheries Res Inst, Key Lab Recreat Fisheries, Minist Agr & Rural Areas, Guangzhou 510380, Peoples R China
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 ）
ISSN：
年卷期： 2021 年 16 卷 4 期
页码：
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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