钢铁冷轧线含铬废水处理及同步资源化利用  

Treatment and Synchronous Utilization of Chromium-containing Wastewater in Steel Cold Rolling Production Line

作　　者：张一博 李孟[1] 杜宁 李嘉炜 张倩[1] ZHANG Yi-bo;LI Meng;DU Ning;LI Jia-wei;ZHANG Qian(School of Civil Engineering and Architecture,Wuhan University of Technology,Wuhan 430070,China)

机构地区：[1]武汉理工大学土木工程与建筑学院,湖北武汉430070

出　　处：《中国给水排水》2022年第2期110-115,共6页China Water & Wastewater

基　　金：海绵城市建设水系统科学湖北省重点实验室开放基金资助项目(2019-06)。

摘　　要：针对某钢铁厂冷轧机组排放的含铬废水中Cr(Ⅵ)浓度达标但总铬不能稳定达标、铬泥作为危废出厂等问题,采用纤维吸附技术从源头对Cr(Ⅵ)进行回收,确保出水水质达标,并通过基于离子交换技术的转化系统实现Cr(Ⅵ)的资源化利用。通过试验确定吸附系统的最优吸附周期与转化系统的最适pH值。系统优化后,出水Cr(Ⅵ)及总铬浓度分别保持在0.048、0.1 mg/L以下,满足《钢铁工业水污染物排放标准》(GB 13456—2012);与原工艺相比,无需再外加药剂调节pH值,极大地节省了处理成本;铬泥产量减少90%以上;产生的重铬酸液可实现资源化利用,据统计产生的综合经济效益可达520.6万元/a。Aiming at the problems such as the total effluent chromium other than Cr(Ⅵ) could not meet the standard stably in the chromium-containing wastewater discharged from a steel cold rolling units and the chromium sludge has to be shipped outside the factories as hazards wastes,the fiber adsorption technology was employed to ensure the effluent quality to meet the requirement of national sewage discharge standard,and the ion exchange technology was used to realize resource utilization of Cr(Ⅵ).Based on the pilot test,the suitable operation period of the adsorption system and pH of the ion exchange system were determined.After system optimization,the effluent concentrations of Cr(Ⅵ) and total Cr kept below 0.048 mg/L and 0.1 mg/L respectively,which meet the Discharge Standards of Water Pollutants for Iron and Steel Industry(GB 13456-2012).Compared with the original process,it is not necessary to adjust the pH,thus greatly saving the treatment costs.Additionally,the output of chromium sludge is reduced by over 90%,and the accumulated and conversed chromate solution can be utilized.According to the statistics,the comprehensive economic benefit can approach to 5.206 million yuan/a.

关 键 词：含铬废水 Cr(Ⅵ)回收 资源化利用 

分 类 号：TU992[建筑科学—市政工程]