摘要
以某金属加工企业废水为研究对象,考察了含磷废水回用工艺,即钙盐除磷和过滤的工艺条件,结果表明,废水pH调至10.0~10.5,CaC12投加浓度为700~800 mg/L,PAC投加浓度为150~200 mg/L,除磷系统沉淀出水TP=3~5 mg/L,去除率可达95%,同时去除了废水中少量的重金属离子.沉淀池出水经过砂滤和炭滤后TP<3 mg/L,Zn2+<1 mg/L,Ni2+<0.8 mg/L,水质优于回用水指标直接回用,减少了排放.
Based on effluents of metal processing, the condition of phosphorus removal using calcium salt and water reusing had been studied. The research results showed that, optimum pH of phosphorus removal by calcium salt was 10.0 to 10.5, when the dosage of calcium salt was 700 to 800 mg/L, the dosage of PAC was 150 to 200 mg/L, TP of effluent from sedimentation tank was 3 to 5 mg/L, while the removal rate can reach up to 95 %. Meanwhile, some metal ions were removed. Effluents of sedimentation tank were pumped to Sand filter and Carbon filter, the final phosphorus concentration was less than 3 mg/L, zinc ions was less than 1 mg/L, and nickel ions was less than 0.8 mg/L. It indicated that, quality of treated water wad better than recycled index, discharged water was reduced.
出处
《能源环境保护》
2014年第6期37-39,共3页
Energy Environmental Protection
关键词
含磷废水
钙盐除磷
多介质过滤
水回用
Phosphorus wastewater
Phosphorus removal by calcium salt
Multi-media filter
Water reuse