“多级膜系统分液-生物制剂-蒸发”技术在含镍废水的工程实例

"Multi-layer Membrane System Liquid Separation-Biological Agents-Evaporation"Engineering Case Studies On Nickel Containing Wastewater

针对含镍废水具有盐分高、含少量镍等特点,采用“多级膜系统分液-生物制剂-蒸发”工艺设计:(1)“多级膜系统分液”实现对水中SO_(4)^(2-)和Cl^(-)的分离,经膜系统浓缩后降低后端蒸发工序的水量,产水进行回用,蒸发产盐符合《工业无水硫酸钠》(GB/T6009-2014)Ⅲ类合格品标准,用于工业生产使用或者销售,带来经济效益;(2)含镍废水经过电渗析浓缩后,盐分比较高,普通碱法除镍效果不佳,但生物制剂脱除镍工艺能将镍含量控制在0.33 mg/L以下。(3)本套工艺系统具有运行稳定、处理成本低、自动化程度高等优点,全面解决含镍废水排放带来的环境污染风险,真正做到零排放要求,具有推广实用价值。

In response to the characteristics of high salt content and small amount of nickel in nickel containing wastewater,a"multi-stage membrane system separation biological agents evaporation"process design is adopted:(1)"multi-stage membrane system separation"achieves the separation of SO_(4)^(2-)and Cl^(-)in water.After concentration by the membrane system,the amount of water in the back-end evaporation process is reduced,and the produced water is reused.The evaporation salt production meets the Class III qualified product standard of"Industrial Anhydrous Sodium Sulfate"(GB/T6009-2014),Used for industrial production or sales,bringing economic benefits;(2)After electrodialysis concentration,the nickel containing wastewater has a relatively high salt content.The ordinary alkaline method has poor nickel removal effect,but the biological agent nickel removal process can control the nickel content below 0.33 mg/L.(3)This process system has the advantages of stable operation,low treatment cost,and high degree of automation,comprehensively solving the environmental pollution risk caused by the discharge of nickel containing wastewater,truly achieving zero emission requirements,and has practical value for promotion.