Adsorbent derived from sewage sludge and its application in dye wastewater treatment
This paper presents results of chemical activation of sewage sludge.A waste material generated in sewage treatment processes,to produce an adsorbent for Direct Fast Brown M removal.Dewatered sewage sludge samples were subjedted to chemical treatment by zinc chloride at various molar concentrations and were then pyrolyzed in inert gas atmosphere at various temperatures for different hold times.Scanning electron microscope image photographs,element composition,and pore structure were analyzed for the sludge adsorbent characteristics.In this study.It was shown that pyrolysis temperature and activation chemicals used significantly affect the surface area development and pore structure evolution.Solution molar concentration of the activating agent is a particularly important factor.The optimal conditions for a larger surface area adsorbent were 4 M ZnCl2-immersed sludge pyrolyzed at 550℃for 60 min,the highest BET surface area and micropore area achieves 174 m2/g,and 95 m2/g,respectively.The experiment to adsorb the Direct Fast Brown M waste water was carried out.It is noteworthy to point out that more than 80％reduction in COD value has occurred for Wastewater sample.Experimental results show clearly that the sludge derived adsorbent is capable of removing Direct Fast Brown M by adsorption,its capacity is about 71％that of the GAC.The maximum adsorption capacity is 500 mg/g.Experimental results demonstrate that sewage sludge,a waste matedal in abundant supply,is a viable source of activated adsorbents.
sewage sludge adsorbent chemical activation adsorption capacity dye removal
CHEN Chunyun ZHUANG Yuanyi
College of Environment & Resources,FuZhou University,Fuzhou 350002,China Department of Environmental Science & Engineering,Nankai University,Tianjin 300071,China
国际会议
西安
英文
717-725
2008-05-15（万方平台首次上网日期，不代表论文的发表时间）