碱改性活性炭深度处理不锈钢废水的研究  

Advanced Treatment of Stainless Steel Wastewater by Alkali Modified Activated Carbon

作　　者：刘雅瑾 雷国元[1,2] 

机构地区：[1]武汉科技大学资源与环境工程学院,湖北武汉430081 [2]冶金矿产资源高效利用与造块湖北省重点实验室,湖北武汉430081

出　　处：《环境科学与技术》2016年第10期133-137,共5页Environmental Science & Technology

基　　金：国家自然科学基金重点项目(50578051)

摘　　要：为应对将来沿海不锈钢企业排水标准的可能提高,文章研究了活性炭深度处理不锈钢工业重金属废水。用NaOH改性活性炭后,吸附重金属容量增加了4倍。分析表明,改性使活性炭的比表面积和平均孔径分别增大了6.25%和3.38%,官能团种类没有发生变化,活性炭表面羰基含量增加了145%。改性活性炭吸附重金属容量的增加基于表面羰基含量的增加,再生引起活性炭吸附容量的衰减源于活性炭孔道的坍塌。用其深度处理不锈钢废水,出水中重金属含量指标可达到《海水水质标准》(GB 3097-1997)Ⅱ类标准规定的要求。改性活性炭可再生性能好,再生5次后,再生率仍达95%。以海水Ⅱ类为目标,改性活性炭深度处理成本接近5元/m^3,与"反渗透-回用"工艺的成本相近。In order to meet the developing drainage standard of coastal stainless steel enterprises in the future, the advanced treatment of heavy metal wastewater from stainless steel industry was studied. After modification by NaOH, a 4-fold increase was obtained for the adsorption capacity of heavy metals. The analysis shows that the specific surface area and average pore diameter of the alkali modified activated carbons increased by 6.25% and 3.38%. And the species of functional groups was unchanged, and the carbonyl contents of carbons＇ surface increased by 145%. The adsorption capacity of heavy metals by modified activated carbon increased with the increasing of the content of the surface carbonyl, and the attenuation of activated carbon adsorption capacity dues to the collapse of active carbon pore canal. After the advanced treatment of stainless steel wastewater, the contents of heavy metal in effluent water was conform to the Grade Ⅱ of Sea Water Quality Standard（GB3097-1997）. Furthermore, after five times of regeneration with saturated activated carbon, the regeneration rate is still up to 95%. For targeting the Grade Ⅱ of Sea Water Quality Standard, the cost of advanced treatment with modified activated carbon is close to 5 yuan/m^3, that is similar to the reverse-osmosis and reuse process.

关 键 词：碱改性 活性炭 不锈钢废水 重金属 

分 类 号：X703.1[环境科学与工程—环境工程]