| Citation: | Yiqun Gan, Yanxin Wang, Congjun Zhang. Removal of Cu(Ⅱ) from Wastewater Using Acidified Sewage Sludge Ash. Journal of Earth Science, 2004, 15(3): 290-294.
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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 pHZPC 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 (
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