基于混凝沉淀工艺的城市污水处理厂尾水深度脱色技术研究

Study on Deep Decolorization Technology of Tail-water in Municipal Waste Water Treatment Plant Based on Coagulation Sedimentation Process

随着中国水污染问题的日益突出及排放标准的日益严格,大众对环境质量的要求逐渐提高,不断提高污水处理厂出水水质和降低尾水色度逐渐成为研究热点。重点对基于混凝沉淀工艺的城市污水深度处理技术进行分析,总结发现:利用污水处理厂常用的消毒药剂次氯酸钠,将原有混凝剂以季胺型阳离子高分子有机化合物为主要有效成分的脱色剂进行替换,对深度处理系统进行改造后,“次氯酸钠预氧化+混凝沉淀”后色度去除率可达60%,经次氯酸钠强化脱色后去除率可达70%,在较小的改造及运行投入条件下具有较好的去除效果。

With the increasingly prominent water pollution in China,the stringent discharge standards,and the people′s gradually improved requirements for environmental quality,how to continuously improve the quality of effluent from sewage treatment plants and reduce the color of tail water has gradually become a research hot spot.In this paper,the advanced treatment technology of municipal sewage based on coagulation and sedimentation process is analyzed.It is found that the advanced treatment system is carried out by using sodium hypochlorite,a commonly used disinfectant in sewage treatment plants,to replace the original coagulant with quaternary amine cationic macromolecule organic compound as the main effective component.After modification,the chroma removal rate can reach 60%after sodium hypochlorite pre-oxidation+coagulation and precipitation,and 70%after enhanced decolorization by sodium hypochlorite.It has better removal effect under smaller modification and operation conditions.