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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。
Introduced a stainless steel industrial wastewater treatment and heavy metal resources of the design process. Aiming at the characteristics of high acidity, large pH fluctuation, high fluoride ion content, high concentration of heavy metals and low COD in stainless steel wastewater, a 50% wastewater reuse rate and a nickel-chromium Such as heavy metal resources. The removal rates of COD, total chromium, total nickel, total iron and fluorine in wastewater were 67.3%, 99.7%, 99.8%, 99.8% and 97.0% respectively. The water quality of the effluent meets the first-class standard of “Emission Standard of Water Pollutants for Steel Industry” (GB 13456-92) and Integrated Wastewater Discharge Standard (GB 8978-1996), and the quality of the reclaimed water meets the water requirements of stainless steel enterprises. Recycled water and heavy metal resources after the proceeds of 4.02 yuan / m3.