磁沉淀工艺在PCB印制线路板废水处理中的应用

Application of Magnetic Precipitation Process in PCB Wastewater Treatment

广东某PCB印制线路板园区集中污水处理站设计水量为12000 m^(3)/d,总磷排放标准为0.5 mg/L,由于污水中含有部分次磷,深度处理采用芬顿氧化澄清工艺。该污水处理站地处工业园核心区,用地紧张,芬顿氧化配套的常规澄清池由于面积不足,存在漂泥情况,TP和SS难以稳定达标。根据现场情况,将现有的澄清池改造为磁沉淀高效澄清池,提高芬顿氧化出水净化指标。长期运行结果表明:磁沉淀工艺对PCB印制线路板废水芬顿氧化出水具有良好的澄清效果,在进水悬浮物浓度≤1000 mg/L,总磷≤2.0 mg/L时,出水悬浮物浓度≤30 mg/L,总磷≤0.5 mg/L,磁沉淀系统占地面积76 m^(2),沉淀表面负荷≥12.5 m^(3)/(m^(2)·h),处理水量峰值可达15000 m^(3)/d,运行电耗成本0.042元/t水,运行磁粉损耗成本为0.0113元/t水,自动化运行程度高,水质波动适应性强,出水稳定。

The wastewater treatment capacity of a centralized wastewater treatment station in a PCB park in Guangdong province was 12000 m^(3)/d,and the total phosphorus emission standard was 0.5 mg/L.The Fenton oxidation clarification process was used for advanced treatment,due to the presence of some sub-phosphorous in the wastewater.The wastewater treatment plant is located in the core of the industrial park,land use is tight,and Fenton oxidation supportsthe conventional clarifier because of the lack of area,there is floating sludge,TP and SS are difficult to achieve stable standards.According to the field conditions,the existing clarifier was transformed into a high-efficiency magnetic precipitation clarifier to improve the purification index of Fenton oxidation effluent.The results of long-term operation show that the magnetic precipitation process has a good clarifying effect on the Fenton oxidation effluent of PCB wastewater.When the concentration of influent suspension≤1000 mg/L and total phosphorus≤2.0 mg/L,the concentration of effluent suspension≤30 mg/L and total phosphorus≤0.5 mg/L,the area of the magnetic precipitation system was 76m^(2),the surface load of the precipitation was≥12.5 m^(3)/(m^(2)·h),the peak value of treated water can reach 15000 m^(3)/d,the cost of power consumption is 0.042 yuan/t of water,the cost of magnetic powder consumption is 0.0113 yuan/t of water.The high degree of automation,water quality fluctuation adaptability and stability.