摘要
以某污水厂二级出水为研究对象,采用不同深度处理工艺,分析各工艺出水水质保障率以确定不同回用途径的城市污水所适宜的深度处理工艺。研究结果表明:混凝-沉淀-过滤和混凝-沉淀-粗砂滤-活性炭工艺出水回用作城市非饮用水时,对满足阴离子表面活性剂(≤0.5mg/L)、粪大肠菌群(≤200个/L)保障率分别为74.59%、98.77%和0、12.82%;回用作工业用水时,对满足总硬度(≤450mg/L)保障率分别为66.52%和87.27%;回用作景观用水时,对满足BOD5(≤6mg/L)、阴离子表面活性剂(≤0.5mg/L)、石油类(≤1mg/L)保障率分别为91.26%、74.59%、0和100%、98.77%、94.56%。混凝-沉淀-粗砂滤-精滤-纳滤工艺对各回用途径下出水指标保障率均为100%。在结合技术经济性和水质保障率的基础上建议:臭氧强化混凝-沉淀-过滤工艺可作为城市非饮用水处理工艺;石灰混凝-沉淀-粗砂滤-活性炭工艺可作为工业回用水处理工艺;混凝-沉淀-粗砂滤-精滤-纳滤工艺可作为景观用水处理工艺。
Taking secondary effluent from a wastewater treatment plant as the research object, several processes for its advanced treatment were adopted, and proper processes corresponding to different effluent reuse approaches were finally determined through analyzing the effluent water quality guarantee rates of different processes. The results showed that： when the effluent water from coagulation-sedimentation-filtration process and coagulation-sedimentation-coarse sand filtration-activated carbon process was reused as urban non-drinking wa- ter, the guarantee rates of the above two kinds of water meeting the specification for anionic surfactant（≤ 0.5 mg/L） and fecal coliforms（≤ 200 个/L） were 74.59%, 98.77%, 0 and 12.82% respectively; when they were reused as industrial water, the guarantee rates of them meeting the specification for total hardness（≤ 450 mg/L） were 66.52% and 87.27% respectively; when they were reused as scenic water, the guarantee rates of them meeting the specification for BOD5（≤6 mg/L）, anionic surfactant（≤0.5 mg/L）, petroleum pollutants（≤ 1mg/L） were 91.26%, 74.59%, 0 and 100%, 98.77%, 94.56% respectively. For different reuse approaches, the guarantee rates of the effluent water from coagulation-sedimentation- coarse sand filtration- refined filtration-nano filtration process meeting the specification for all kinds of pollutant indexes were all 100%. On the basis of technical and economic analysis and water quality guarantee rates, some suggestions were given, which included： using ozone enhanced coagulation-sedimentation-filtration process to treat the municipal sewage which would be reused as urban non-drinking water; using lime coagulation-sedimentation-coarse sand filtration- activated carbon process to treat the sewage which would be reused as industrial water; using coagulation-sedimentation-coarse sand filtration-refined fihration-nano filtration to treat the sewage which would be reused as scenic water.
出处
《工业用水与废水》
CAS
2013年第2期15-18,38,共5页
Industrial Water & Wastewater
关键词
再生水
安全保障率
纳滤
深度处理
回用途径
reclaimed water
safety reliability
nano filtration
advanced treatment
reuse approaches
