不锈钢生产废水的处理回用与重金属资源化利用

介绍了某工业园区不锈钢废水处理及重金属资源化工艺设计方案。针对不锈钢废水酸度高、pH值波动大、氟离子含量高、重金属浓度高、COD低的特点,采用CaCO3滤床/分级沉淀/过滤的废水处理工艺,实现50%的废水回用率和镍铬等重金属的资源化。该工艺对废水中COD、总铬、总镍、总铁和氟的去除率分别为67.3%、99.7%、99.8%、99.8%及97.0%。出水水质达到《钢铁工业水污染物排放标准》(GB 13456—92)和《污水综合排放标准》(GB 8978—1996)的一级标准,回用水水质达到不锈钢企业的用水要求。水回用及重金属资源化后的收益为4.02元/m3。

Stainless Steel Wastewater Treatment and Heavy Metals Recovery

The design project for stainless steel wastewater treatment and heavy metals recovery in an industrial park was introduced.According to the characteristics of the wastewater with high acidity,large pH fluctuation,high fluoride ions,high concentration of heavy metals and low COD,the combined process of CaCO3 filter,step precipitation and sand filter was adopted to treat the wastewater.After being treated,50% of the wastewater and the heavy metals were reclaimed.The removal rates of COD,total chromium,total nickel,total iron and fluorine were 67.3%,99.7%,99.8%,99.8% and 97.0% respectively.The effluent quality could achieve the first class criteria specified in the Discharge Standard of Water Pollutants for Iron and Steel Industry(GB 13456-92) and the Integrated Wastewater Discharge Standard(GB 8978-1996).The reused water quality could achieve the requirement of stainless steel manufacturing processes.After the treated wastewater reuse and resource recovery,the profit was 4.02 yuan/m3.