摘要
针对电镀废水重金属离子危害严重、水质复杂且水量变化大、直接达标排放困难等问题,采用分质收集/预处理/集中达标处理(多介质过滤+精密过滤)/深度回用处理(反渗透+超滤)/纯水回用组合技术,设计并建造了140 m^3/d污水处理工程,实现污水直接达标排放或回用。2年多的运行结果表明,其出水Cr^(6+)、总铬、总银、总铜、总锌、总镍、SS、石油类、总氰化物均达到《电镀行业污染物排放标准》(GB 21900—2008)新建企业水污染物排放浓度限值要求,COD、NH3-N、TP满足《太湖地区城镇污水处理厂及重点工业行业主要水污染物排放限值》(DB 32/1072—2007)中电镀工业标准。经测算,本工程运行总成本为38.23万元/a,除去回用收益,则年总运行成本仅为22.15万元(约5.27元/m^3)。本工程将不同种类电镀废水的分质与混合处理有机结合,不仅投资少,运行费用低,而且可以实现回用,具有一定的应用示范和推广意义。
Electroplating wastewater was difficult to be treated due to hazardous heavy metals ions, complicated water quality and fluctuation of water flow. So it was difficult that the effluent of conventional treatment process meet drainage permeation standard. In this study, electroplating wastewater was successfully treated by the combination process of individual collection/pretreatment/concentrated treatment （ multi-media filtration ＋ precision filtration）/advanced treatment （ reverse osmosis ＋ ultrafiltration） / pure water reuse. The pilot plant with capacity of 140 m^3/d was built and operated well for two years. All the effluent concentrations of Cr^6＋ , total Cr, total Ag, total Cu, total Ni, SS, petroleum and cyanidein could meet the new enterprise water pollutant discharge concentration limit requirement in the Discharge Standard for Pollutants from Electroplating Industry （ GB 21900 - 2008 ）. Additionally, the effluent concentrations of COD, NH3 - N and TP all met the electroplating industry requirements of Discharge Standard of Main Water Pollutants for Municipal Wastewater Treatment Plant ＆ Key Industries of Taihu Area （ DB 32/1072 - 2007 ）. This pilot plant would cost 0. 382 million （ RMB ） every year and only cost 0. 221 5 million （RMB） if the benefit from the wastewater reuse was taken into account. The proposed technology in this study combined individual collection and concentration treatment, not only had the advantages of low investment, low operating costs, but also could reuse effluent. It has certain project demonstration and promotion significance.
出处
《中国给水排水》
CAS
CSCD
北大核心
2017年第10期104-108,共5页
China Water & Wastewater
基金
江苏省和常州市科技支撑项目(BY2015027-03
BE2016653
WS201621)
关键词
电镀废水
分质收集
重金属离子
回用
electroplating wastewater
collection in terms of water quality
heavy metal ions
reuse
