摘要
以重庆市57座城市污水处理厂进水实际运行数据为基础,系统分析了进水(污水)水质特征以及有机物、氮、磷和悬浮物之间的概率分布和相关关系。结果表明,重庆市污水中BOD5、COD、SS、NH3-N、TN和TP全年浓度分布均呈正偏态分布,月中间值分布范围分别在140~180、300~350、180~220、25~33、37~46和3~5 mg/L。进水BOD5/COD值分布在0.4~0.6之间的占39.4%,说明重庆市污水中存在一定的难生物降解性污染物,但仍适应于生物处理。BOD5/TN分布在4~6之间的概率为37.8%,表明大多数情况下生物脱氮的碳源不足。BOD5/TP的平均值为39.8,且大于20的累积概率为95.9%,表明污水在处理中可以满足生物除磷的需求。TN/TP分布在5~15之间的概率为88.5,平均值为10.8,且TN/TP>5的概率为98.3%,表明进水完全满足微生物生长对氮、磷的需求。
The influents of 57 wastewater treatment plants(WWTP) in Chongqing were investigated to analyze the characteristic of water quality, the probability distribution of the main pollution indicators, and the correlations among the organic matters, suspended solids, nitrogen and phosphorus. The results showed that the trend of BOD5, COD, SS, NH3-N, TN and TP in the influents were in accordance with positively skewed distribution, and the concentrations of BOD5, COD, SS, NH3-N,TN and TP(monthly median) were in the range of 140~180, 300~350, 180~220, 25~33, 37~46 and 3~5 mg/L, respectively.The probability distribution of BOD5/COD ratios in influent between 0.4 and 0.6 was 39.4%, indicating that the biodegradability of the influents was well although there were some refractory biodegradable substances. The probability distribution of BOD5/TN ratios between 4 and 6 was 37.8%, which meant that the carbon source was inadequate for denitrification. The average of BOD5/TP ratios was 39.8, and the cumulative probability of the BOD5/TP ratios above 20 were 95.9%, indicating that the influent can meet the demand for biological phosphorus removal. The probability distribution of TN/TP ratios between 5and 15 was 88.5% with an average of 10.8, and 98.3% of the values were above 5. Therefore, the influents can meet the demands of nitrogen and phosphorus for microbial growth.
出处
《环境科学与技术》
CAS
CSCD
北大核心
2014年第S1期397-402,共6页
Environmental Science & Technology
基金
国家自然科学基金(51348011)
关键词
污水处理厂
进水水质
水质特征
统计分析
wastewater treatment plant
influent quality
characteristics of influent quality
statistical analysis
