给排水采暖专业论文 摘要:冷轧厂电镀锌工艺的给排水采暖专业论文改造,引起废水中锌含量增大到800mg/L,需处理后排放。采用中和—薄膜过滤技术相结合的给排水采暖专业论文工艺处理电镀锌废水,可使废水中锌含量达到国家排放标准,处理后的废水可回收利用。 关键词:电镀 废水处理 中和 过滤
中图分类号:X781.1 文献标识码:A 文章编号:1009-2455(2000)03-0025-03
Treatment of Wastewater from Electric Galvanization ZHANG He-ming
Abstract:The revamping of the electric galvanization process in a cold rolling mill caused the increase of zine content in the wastewater to 800mg/L and therefore the wastewater needed to be treated before discharged.The use of a combined technology of neutralization and membrane-filtration in the treatment of the wastewater from electric galvanization made the zine content in the wastewater meet the state discharge standard and the treated wastewater can be recycled and reused. Key words:electric galvanization;wastewater treatment;neutralization;filtration
1 废水来源及水质
宝钢电镀锌机组生产工艺中,为提高产品质量,对生产工艺进行了改进,导致大量的Zn2+随废水排出,从而使酸碱废水处理系统中排放水Zn2+超标排放标准为≤4 mg/L,平均为14.26~9.71mg/L,造成月缴排污费20~30万元;另一方面造成了资源浪费。引起排水锌含量超标的废水主要来自机组中的溶锌坑和废水坑,水质变化无规律,其成份详见表1。
表1 冷轧含锌废水水质
|