城市污水厂污泥改性物对Hg(Ⅱ)吸附的研究  

Adsorption of Hg^(2+) in Industrial Wastewater by Discarded Activated Sludge and Its Chemically Modified Product from Urban Sewage Treatment Plant

作　　者：刘春华[1] 曾经[1] 夏畅斌[1] 何湘柱[2] 

机构地区：[1]长沙理工大学化学与环境工程系,湖南长沙410076 [2]广东工业大学轻工化工学院,广东广州510090

出　　处：《材料保护》2007年第5期58-60,共3页Materials Protection

基　　金：国家自然科学基金项目(50004003);湖南省自然科学基金项目(00JJY20118)

摘　　要：以城市污水处理厂活性污泥为原料,制取干污泥,并将其和化学改性污泥作为吸附剂,对含Hg(Ⅱ)离子的废水进行了吸附试验研究。考察了溶液pH值、吸附剂用量和Hg(Ⅱ)离子的初始浓度对去除率的影响。结果表明,干污泥及其化学改性污泥吸附剂对Hg(Ⅱ)离子的吸附符合Lagergren一级动力学方程。在试验条件下,化学改性污泥的相对吸附量高于干污泥,因此,活性污泥经过化学改性后能够提高对Hg(Ⅱ)离子的吸附能力。用0.1mol/LHNO3溶液进行超声解吸附,Hg(Ⅱ)离子的回收率可达70%左右。利用这种吸附剂可以有效地去除工业废水中的Hg(Ⅱ)离子。The discarded active sludge from an urban wastewater treatment plant was used to prepare dried sludge and chemically modified sludge(using H2SO4 and ZnCl2 as the chemical activation reagents) as the adsorbents.The resulting two types of sludge were used to adsorb Hg(Ⅱ) ions in industrial wastewater for the purpose of wastewater treatment.Thus the effects of the wastewater pH value,dosage of the adsorbents,and the original concentration of Hg(Ⅱ) in wastewater on the removal rate of Hg(Ⅱ) ions were investigated.It was found that the Hg(Ⅱ) ions in the industrial wastewater could be effectively eliminated using the chemically modified activated sludge.The adsorption of the Hg(II) ions in wastewater by the dried activated sludge and chemically modified activated sludge well conformed to Langmuir's first order dynamic equation.At the same time,the chemically modified activated sludge had much better adsorption capacity than the dried activated sludge,indicating that the adsorption capacity of the activated sludge could be greatly increased by chemical modification.Moreover,the Hg(II) ions adsorbed by the chemically modified activated sludge could be recovered at a rate of about 70%,using ultrasonic desorption in HNO3 solution of a concentration 0.1 mol/L,indicating that the titled chemically modified activated sludge could be readily used for the treatment of the industrial wastewater containing Hg(Ⅱ) ions.

关 键 词：废水处理 化学改性污泥吸附剂 吸附 汞离子 动力学 

分 类 号：X703[环境科学与工程—环境工程]