Evaluation of nutrients removal in full-scale modified oxidation ditch system in the ambient conditions

2011 International Conference on Remote Sensing, Environment and Transportation Engineering Pub Date : 2011-07-29 DOI:10.1109/RSETE.2011.5964733

Zhiquan Yang, G. Liu

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Abstract

A modified oxidation ditch process is applied in a full-scale municipal wastewater treatment plant. Compared with the conventional oxidation ditch, the modified oxidation ditch adds some microporous aerators to improve oxygen utilization. The measures bring about a further improvement of nitrogen and phosphorus in the urban wastewater. The monitoring results for one year show that the influent concentrations of SS, COD, NH4-N and TP are 160–320, 170–320, 8–16, 2.5–4.0 mg/L, respectively. And the influent pH and temperature are 7.0–8.5 and 17–27 °C. Afte the treatment of modified oxidation ditch process, the average effluent concentrations of SS, COD, NH4-N, TP are 18, 20, 2.4, 0.8 mg/L, and the average removal rates are 92%, 90%, 80%, 60%, respectively. The effluent pH is consisted with the influent pH. The removal efficiency of nitrogen and phosphorus can be kept at good efficiency, in spite of the fluctuation of temperature. The effluent quality meets the 1 B level discharging criteria in China.

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环境条件下全尺寸改性氧化沟系统对营养物去除的评价

将一种改进的氧化沟工艺应用于某大型城市污水处理厂。与常规氧化沟相比，改进后的氧化沟增加了微孔曝气器，提高了氧的利用率。这些措施使城市污水中氮、磷的含量得到了进一步的改善。1年监测结果表明，进水SS、COD、NH4-N、TP浓度分别为160 ~ 320、170 ~ 320、8 ~ 16、2.5 ~ 4.0 mg/L。进水pH 7.0 ~ 8.5，进水温度17 ~ 27℃。经改性氧化沟工艺处理后，出水SS、COD、NH4-N、TP平均浓度分别为18、20、2.4、0.8 mg/L，平均去除率分别为92%、90%、80%、60%。出水pH值与进水pH值基本一致，在温度波动的情况下，对氮、磷的去除率保持较好。出水水质达到中国B级排放标准。

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2011 International Conference on Remote Sensing, Environment and Transportation Engineering

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