合流制排水系统污水水质及悬浮物粒度分布特征研究

发布时间：2018-04-10 23:11

本文选题：合流制排水系统 + 水质分析　；参考：《给水排水》2014年S1期

【摘要】：为了解典型合流制排水系统旱流及雨污混合水的水质特征及合流制排水系统中悬浮颗粒的粒径分布,对镇江主城区合流制排水系统中具有代表性的排水主干管及污水厂进厂前监测点的降雨量、污染物浓度及粒径分布进行监测与分析。结果表明:雨污混合水中COD、氮、磷等污染物浓度随降雨强度存在一定程度浮动变化。进厂前水质旱流污水B/C值较雨污混合水B/C值高出26%,雨污混合水可生化性较差。雨污混合水SS浓度(122mg/L)显著高于旱季(98mg/L),对雨污混合水进行预处理,可减少剩余污泥产量。营养盐与降雨量呈一定负相关关系,BOD5与营养盐有一定正相关性,说明营养元素多为有机态。雨污混合水中悬浮物以无机大颗粒(d=10~100μm)和无机粗颗粒(d100μm)为主,说明合流制排水系统具有很大的污泥前端减量空间。进厂前雨季、旱季原水1h的SS去除率分别为67.5%和55.2%,延长沉淀时间去除率增加不明显。计算得出SS的指示沉降速率,可为悬浮物分离装置的停留时间及沉淀深度等设计参数的选择提供参考。
[Abstract]:In order to understand the water quality characteristics of dry and rain-polluted mixed water in typical combined drainage system and the particle size distribution of suspended particles in combined drainage system,The rainfall, pollutant concentration and particle size distribution of the representative drainage trunk pipes and the monitoring points before the sewage treatment works were monitored and analyzed in the combined drainage system of Zhenjiang main urban area.The results showed that the concentration of COD, nitrogen and phosphorus varied with rainfall intensity to a certain extent.The B / C value of dry-flow wastewater was 26% higher than that of rain-polluted mixed water before entering the plant, and the biodegradability of rain-polluted mixed water was poor.The SS concentration of rainwater mixed water was significantly higher than that of dry season and the concentration of SS was significantly higher than that of dry season. Pretreatment of rain-sewage mixed water could reduce the yield of excess sludge.There was a negative correlation between nutrient and rainfall. BOD5 was positively correlated with nutrient, indicating that most of nutrient elements were organic.The suspended matter in rainwater mixed water is mainly composed of inorganic large particles (100 渭 m) and inorganic coarse particles (100 渭 m), which indicates that the combined flow drainage system has a large space for sludge reduction in the front end.In rainy season, SS removal rate of raw water in dry season was 67.5% and 55.2%, respectively.The calculated settlement rate of SS can be used as a reference for the selection of design parameters such as residence time and settling depth of suspensions separation device.
【作者单位】：重庆大学三峡库区生态环境教育部重点实验室;镇江市水业总公司;
【分类号】：X703;TU992

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