| 摘要: |
| 选取化学需氧量(COD)、氨氮(NH3-N)、五日生化需氧量(BOD5)、总氮(TN)、总磷(TP)、悬浮物(SS)为统计指标，对采用氧化沟工艺的重庆市城镇污水处理厂2015—2017年的出水水质进行了分析，结果表明：6项指标的达标率均在978%以上，平均去除效率较高的是NH3-N和BOD5，较低的是TN和TP；NH3-N和BOD5去除效率比较集中，TN和TP去除效率则比较分散；由于受季节和进口浓度的影响，各项指标出水浓度离散程度较大，TP和TN出水浓度近似服从正态分布，出水水质95%的置信区间符合《城镇污水处理厂污染物排放标准》(GB 18918—2002)的一级标准，BOD5和COD出水浓度取决于出口水质中的还原性有机污染物的总量，除NH3-N与TP之间呈负相关外，其余两两指标间均呈正相关。 |
| 关键词: 城镇污水处理厂 氧化沟工艺 达标率 相关性 |
| DOI： |
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| Comprehensive Evaluation on Oxidation Ditch Treatment Technology in Town Wastewater Treatment Plants in Chongqing City |
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LI Xiao hong 1，LIU Zheng shi 2，XU Long jun 3，ZHANG Hai dong4，LI Xiao qing5，LI Li6
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| Abstract: |
| Effluent quality of town wastewater treatment plants based on oxidation ditch treatment technology from 2015 to 2017 were analyzed statistically with regard to COD，NH3-N，BOD5，TN，TP and SS The results showed that the standard reaching ratios of six indexes were above 978% and the average removal rates of NH3-N and BOD5 were higher than those of TN and TP Removal efficiencies of NH3-N and BOD5 were more centralized，while those of TN and TP were decentralized Effluent concentration of each index had great dispersion due to different season and the imported concentration，and those of TP and TN were distributed normally 95% confidence interval of exports water quality meets the first level standard of“Discharge Standard of Pollutants for Municipal Wastewater Treatment Plant”(GB 18918 2002) The effluent concentration of BOD5 and COD depends on the reducing organic pollutants in the outlet water In addition to negative correlation between NH3-N and TP，there is a positive correlation between the other 2 indexes |
| Key words: urban wastewater treatment plant oxidation ditch process standard reaching rate correlation |
