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ABR-MBR反硝化除磷工艺的启动及稳定运行

本站小编 Free考研考试/2021-12-31

中文关键词反硝化除磷启动生活污水污泥停留时间硝化液回流比 英文关键词denitrifying phosphorus removalstart-updomestic wastewatersludge retention timenitrate recycling ratio
作者单位E-mail
韦佳敏苏州科技大学环境科学与工程学院, 苏州 215009
江苏省水处理技术与材料协同创新中心, 苏州 215009
478223661@qq.com
蒋志云苏州科技大学环境科学与工程学院, 苏州 215009
江苏省水处理技术与材料协同创新中心, 苏州 215009
程诚苏州科技大学环境科学与工程学院, 苏州 215009
江苏省水处理技术与材料协同创新中心, 苏州 215009
朱琳苏州科技大学环境科学与工程学院, 苏州 215009
江苏省水处理技术与材料协同创新中心, 苏州 215009
刘文如苏州科技大学环境科学与工程学院, 苏州 215009
江苏省水处理技术与材料协同创新中心, 苏州 215009
江苏省环境科学与工程重点实验室, 苏州 215009
沈耀良苏州科技大学环境科学与工程学院, 苏州 215009
江苏省水处理技术与材料协同创新中心, 苏州 215009
江苏省环境科学与工程重点实验室, 苏州 215009
ylshen@mail.usts.edu.cn
中文摘要 以低C/N值生活污水为处理对象,重点考察了以厌氧/缺氧(A/A)运行的ABR耦合好氧MBR系统启动过程中脱氮除磷特性及系统长期运行的稳定性.结果表明,控制ABR容积负荷(VLR)为0.8 kg·(m3·d)-1,污泥回流比为80%,硝化液回流比从150%逐步提升稳定至300%,反硝化除磷功能区污泥停留时间(sludge retention time,SRT)为25 d,MBR溶解氧(DO)为1~2 mg·L-1,温度为30℃±2℃,于46 d成功富集了反硝化聚磷菌(denitrifying phosphorus bacteria,DPBs),净释磷量为20.56 mg·L-1,净吸磷量达到27.74 mg·L-1,批次实验表明约84.8%的聚磷菌(PAOs)能够利用NO3--N作为电子受体进行反硝化除磷.启动成功后稳定运行50 d,对COD、NH4+-N、TN和PO43--P的平均去除率分别为91.8%、99.0%、71.5%和94.2%,系统缺氧反硝化除磷去除1 mg·L-1的PO43--P,同步消耗约0.83 mg·L-1的NO3--N,满足同步脱氮除磷的要求. 英文摘要 The nitrogen and phosphorus removal characteristics during the start-up and the long-term operational stability of an anaerobic/anoxic (A/A) ABR coupled aerobic MBR system treating low C/N domestic wastewater were investigated. The results showed that the denitrifying phosphorus bacteria (DPBs) were successfully enriched within 46 d by controlling the nitrate recycling ratio (increasing from 150% to 300%), with a temperature of 30℃±2℃, volume loading rate of 0.8 kg·(m3·d)-1 and sludge reflux ratio of 80% in the ABR, sludge retention time (SRT) in the denitrifying phosphorus removal functional area of 25 d, and the dissolved oxygen (DO) of 1-2 mg·L-1 in the MBR. The net phosphorus release and phosphorus uptake of DPBs reached 20.56 mg·L-1and 27.74 mg·L-1, respectively. Batch tests demonstrated that about 84.8% of phosphorus-accumulating organisms (PAOs) could use NO3--N as an electron acceptor for denitrifying phosphorus removal. After 50 d of stable operation after the successful system start-up, the average removal rates of COD, NH4+-N, TN, and PO43--P were 91.8%, 99.0%, 71.5%, and 94.2%, respectively. The results also suggested that 0.83 mg·L-1NO3--N was consumed per 1 mg·L-1 PO43--P removed during the denitrifying phosphorus removal, indicating that the simultaneous nitrogen and phosphorus removal was achieved in the ABR-MBR system.

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