期刊
CHEMICAL ENGINEERING JOURNAL
卷 185, 期 -, 页码 187-192出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2012.01.072
关键词
Silver; Complexation-ultrafiltration; Rejection; Anionic polyacrylamide
资金
- Sardar Vallabhabhai Patel Education Society
Wastewaters containing silver ions are produced by several sources like metal finishing, electroplating, electronics, hazardous waste disposal sites, galvanic industries, etc. Complexation-ultrafiltration (CUF) is a developing hybrid process for the removal and recovery of heavy metals, even at trace level concentrations, which uses the selectivity of complexing agent and filtration ability of ultrafiltration (UF) membrane. In the present work, separation of silver ions from aqueous solutions by CUF using a novel complexation agent, namely anionic polyacrylamide (average molecular weight >50 kDa) and a polyethersulfone UF membrane (molecular weight cut-off: 10 kDa) was studied along with the effects of operating parameters on metal ions rejection including fouling behavior of the UF membrane used and decomplexation of silver ions for recovery. The UF experiments were performed on Perma (R)-pilot plant using synthetic aqueous solutions of metal salt at different applied pressures (4, 5, 6 atm), initial metal ions concentration in feed (5, 10, 15, 20, 50 ppm), feed pH (4, 5, 6, 7, 8, 9) and polymer-to-metal ions ratio (0.5, 1, 1.5) at a constant feed flow rate of 15 L/min. Maximum rejection, close to 100%, of silver ions has been obtained at optimum operating parameters. Kinetics of complexation reaction of metal ions with anionic polyacrylamide (aPAM) was studied in a separate experiment which suggested that about 24 min is required for silver ions to reach complexation equilibrium. (c) 2012 Elsevier B.V. All rights reserved.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据