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AAO工艺低氧条件下的运行及其模拟
摘要点击 370  全文点击 111  投稿时间:2017-04-13  修订日期:2017-07-04
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中文关键词  AAO工艺  溶解氧浓度  除磷脱氮  模拟  曝气能耗
英文关键词  AAO process  DO concentration  phosphorus and nitrogen removal  simulation  energy consumption of aeration
作者单位E-mail
曹特特 同济大学环境科学与工程学院,污染控制与资源化研究国家重点实验室,上海 200092 519638139@qq.com 
王林 同济大学环境科学与工程学院,污染控制与资源化研究国家重点实验室,上海 200092  
李咏梅 同济大学环境科学与工程学院,污染控制与资源化研究国家重点实验室,上海 200092 liyongmei@tongji.edu.cn 
中文摘要
      利用厌氧-缺氧-好氧(AAO)工艺探讨了在好氧池低溶解氧(DO)浓度条件下的水质指标变化情况.结果表明,当好氧池DO浓度从2.00 mg·L-1降低到1.00 mg·L-1和0.50 mg·L-1时,系统仍然具有良好的除磷脱氮效果,出水水质指标均满足我国《城镇污水处理厂污染物排放标准》(GB 18918-2002)中的一级A标准.在此基础上,基于BioWin 4.1软件建立了AAO工艺的活性污泥模型,对模型参数进行了灵敏度分析,并利用动态模拟对模型参数中的聚磷菌吸收乙酸或丙酸的聚羟基烷酸(PHA)产率系数(YP/PHA,seq)、聚磷菌好氧氧化PHA的储磷率(YP/PHA,aerobic)、氨氧化菌的最大单位生长速率(μmax,A)和亚硝酸盐氧化菌的最大单位生长速率(μmax,N)进行了校验.此外,对系统的曝气能耗进行了模拟评估,结果表明,与好氧池DO浓度为2.00 mg·L-1时相比,好氧池DO浓度为1.00 mg·L-1和0.50 mg·L-1时的空气流量可分别节省23.8%和38.1%,氧转移效率可分别提高7.2%和11.7%.
英文摘要
      The anaerobic-anoxic-oxic (AAO) process was used to investigate the variation of the parameters of water quality when the dissolved oxygen (DO) in the aerobic tank was controlled at a low concentration. The results indicated the system still had good phosphorus and nitrogen removal efficiencies when the DO concentration in the aerobic tank was decreased from 2.00 mg·L-1 to 1.00 mg·L-1 and 0.50 mg·L-1, and the effluent indexes could meet the first class A standard for the "discharge standard of pollutants for municipal wastewater treatment plant" (GB18918-2002) of China. The activated sludge model of the AAO process was developed by BioWin 4.1 software. The sensitivities of the model parameters were analyzed, and the model parameters, such as amount of polyhydroxyalkanoate (PHA) stored per unit of acetate or the propionate sequestered by phosphorus accumulating bacteria (YP/PHA,seq), the amount of phosphorus stored per unit of PHA oxidized in aerobic conditions by phosphorus accumulating bacteria (YP/PHA,aerobic), the maximum specific growth rate of ammonia oxidizing bacteria (μmax,A), and the maximum specific growth rate of nitrite oxidizing bacteria (μmax,N), were calibrated and validated by the dynamic simulation. In addition, the energy consumption of the aeration was simulated and evaluated. The results showed that when the DO concentration in the aerobic tank was decreased from 2.00 mg·L-1 to 1.00 mg·L-1 and 0.50 mg·L-1, the air flow could be reduced by 23.8% and 38.1%, and the oxygen transfer efficiency could be increased by 7.2% and 11.7%, respectively.

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