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Citation: ZHANG Li-Hua, ZHU Zhi-Liang, ZHANG Hua, QIU Yan-Ling, ZHAO Jian-Fu. Extraction of Zn from Sewage Sludge with PESA[J]. Chinese Journal of Applied Chemistry, ;2008, 25(7): 773-776. shu

Extraction of Zn from Sewage Sludge with PESA

1.
a State Key Laboratory of Pollution Control and Resource Reuse, Tongji University, Shanghai 200092;
2.
b Chemistry and Biology Engineering Department, Sanming College, Sanming

Corresponding author: ZHU Zhi-Liang,
Received Date: 31 July 2007
Available Online: 18 September 2007
Fund Project: 国家高技术研究发展计划(八六三)项目(2006AA06Z384) (八六三)项目(2006AA06Z384)福建省教育厅A类科技项目(2006JA06046) (2006JA06046)

Poly-epoxy-succinic acid (PESA),as an environmental benign chelant,was used to remove zinc from the sewage sludge of Shanghai Taopu Wastewater Treatment Plant.Extraction of sewage sludge with aqueous solution of PESA was carried out under various conditions.The influences of pH and concentration of PESA on the extraction efficiency for zinc were investigated.The results show that PESA has a higher extraction efficiency of zinc from sludge than those of other heavy metals,and the extracted zinc mainly comes from the water soluble,acid soluble and reducible fractions.It was found that pH and concentration of PESA have a significant effect on the extraction efficiency of zinc.The extraction efficiency for zinc decreases gradually with pH increasing.When the concentration of PESA increases,the extraction efficiency of zinc increases and the effect of pH decreases.The extraction efficiency of zinc reaches above 70% when pH is 4 and the molar ratio of PESA to total amount of heavy metals ranges from 3 to 10.
- PESA,
- zinc,
- extraction,
- sewage sludge,
- BCR method
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