化学生物联合工艺对PCB行业退锡废水总氮去除工艺研究  

Research on Combined Chemical Biological Process of the Total Nitrogen Removal in the PCB Industry for Tin Retreatment Wastewater

作　　者：钱坡 Qian Po(Xiamen Hongxin Electronic Technology Group Co.,Ltd.,Xiamen 361000,China)

机构地区：[1]厦门弘信电子科技集团股份有限公司,福建厦门361000

出　　处：《广东化工》2022年第23期89-92,29,共5页Guangdong Chemical Industry

摘　　要：水质中总氮超标会严重污染生态环境,危害人体健康。印制线路板行业废水中一般含有较高的总氮,生产过程产生的的硝酸型退锡废水是其总氮的典型来源之一。针对硝酸型退锡废水,为解决金属离子含量和总氮高的问题,采用源头控制,利用化学沉淀法和生物脱氮法,研究了沉淀pH、碳源种类、停留时间、溶解氧等对金属离子和总氮去除效果的影响。研究结果表明,在化学沉淀pH为10、生化进水pH 7.5~8.5、生化停留时间48 h、乙酸钠作为碳源、溶解氧0.2~0.3 mg/L的条件下,采用该方法可以去除退锡废水中99.9%的重金属,总氮去除率在98.5%以上。Excessive total nitrogen in water can seriously pollute the ecological environment and endanger human health. The wastewater from the printed circuit board industry generally contains high total nitrogen, which mainly comes from the nitrate type desoldering wastewater generated from the production process.To solve the problem of high metal ion content and total nitrogen in nitric acid type desoldering wastewater, the effects of precipitation pH, carbon source type,hydraulic residence time and dissolved oxygen on the removal of metal ion and total nitrogen were investigated by using chemical precipitation and biochemical denitrification methods for source control. The results showed that the method could remove 99.9 % of the heavy metals and more than 98.5 % of the total nitrogen from the detinning wastewater under the conditions of chemical precipitation pH 10, biochemical influent p H 7.5~8.5, biochemical hydraulic residence time 48 h,carbon source of sodium acetate, and dissolved oxygen 0.2~0.3 mg/L.

关 键 词：退锡废水 总氮 化学沉淀 生物脱氮 反硝化 

分 类 号：X703[环境科学与工程—环境工程]