| Removal of Cu（ Ⅱ） from Wastewater Using Acidified Sewage Sludge Ash |
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| 作者姓名： | GanYiqun WangYanxin ZhangCongjun |
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| 作者单位： | SchoolofEnvironmentalStudies,ChinaUniversityofGeosciences,Wuhan430074,China |
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| 基金项目： | Thispaperissupportedbythe 863High TechProgramoftheMinistryofScienceandTechnologyofP .R .China (No .2 0 0 2AA0 0 1 0 39) .DepartmentofSci enceandTechnologyofWuhanGovernment，andtheTeachingandResearchAwardProgramforOutstandingYoungTeachersinHigherEducation |
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| 摘 要： | Sewage sludge ash (SSA), the waste generated in sewage sludge incineration, was obtained from Wuhan Sewage Treatment Plant and used as a low-cost sorbent for removing Cu (Ⅱ) from wastewaters. The sorbent was first modified with 5 % sulfuric acid to increase its sorption capacity. The specific surface area, porosity, cation-exchange capacity (CEC) and pHzzc of the sorbent were measured. Batch experiments were made to study the effect of contact time, solution pH value and temperature on sorption. Both Langmuir and Freundlich models well described the Cu (Ⅱ) sorption process,with correlation coefficient (R2 ) values of 0. 993 4 and 0.9899 respectively. And the sorption process follows the Lagergren first order kinetic model. The equilibrium sorption capacity of acidified SSA to Cu(Ⅱ) is estimated to be 7.78 mg/g under optimal conditions.
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| 关 键 词： | 下水道淤泥 水污染 吸附作用 酸化 |
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