Notice of RetractionEvaluation of Nitrogen and Phosphate Removal in Full-Scale Modified A²/O Process

2011 5th International Conference on Bioinformatics and Biomedical Engineering Pub Date : 2011-05-10 DOI:10.1109/ICBBE.2011.5781077

Yang Zhiquan, Zhou Shao-qi

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Abstract

A modified A2/O biological system is applied for the sewage treatment in a full-scale WWTP. Compared with conventional A2/O process, this modified A2/O process adds a pre anaerobic stage, and introduces inflow into pre-anaerobic, anaerobic and anoxic tank simultaneously. These measures bring about a further improvement of nitrogen and phosphorus in urban wastewater. The monitoring results for one year show that the influent concentrations of BOD, NH4-N, TN, TP are 21.9-263.0, 16.3-30.8, 9.7-668 and 1.0-11.3 mg L-l, respectively. After the treatment of modified A2/O process, the average effluent concentrations of BOD, NH4-N, TN, TP are 6.5, 0.6, 10.4, 0.6 mg L-l, and the average removal rates are 93.5%, 96.9%, 61.5% and 78.9%, respectively. The effluent quality meets the 1 B level discharging criteria in China. The operation results show that the modified A2/O process can achieve a high reduction of nitrogen and phosphorus in spite of the fluctuation of influent, and can be widely used in municipal wastewater treatment plants.

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关于全面改进A²/O工艺脱氮、脱磷效果评价的通知

采用改进的A2/O生物系统对某污水处理厂进行污水处理。与传统的A2/O工艺相比，改进后的A2/O工艺增加了预厌氧阶段，同时将进水引入预厌氧、厌氧和缺氧池。这些措施使城市污水中氮磷含量得到了进一步的改善。1年监测结果表明，进水BOD、NH4-N、TN、TP浓度分别为21.9 ~ 263.0、16.3 ~ 30.8、9.7 ~ 668和1.0 ~ 11.3 mg L-l。经改性A2/O工艺处理后，出水BOD、NH4-N、TN、TP的平均浓度分别为6.5、0.6、10.4、0.6 mg L-l，平均去除率分别为93.5%、96.9%、61.5%和78.9%。出水水质达到中国B级排放标准。运行结果表明，改进后的A2/O工艺在不受进水波动影响的情况下仍能实现较高的氮磷还原，可广泛应用于城市污水处理厂。

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2011 5th International Conference on Bioinformatics and Biomedical Engineering

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