Ma Jianfeng, Zhu Lizhong
Department of Environmental Science, Zhejiang University, Hangzhou, Zhejiang 310028, China.
Chemosphere. 2007 Aug;68(10):1883-8. doi: 10.1016/j.chemosphere.2007.03.002. Epub 2007 Apr 12.
A novel technology of wastewater treatment was proposed based on simultaneously synthesis of organobentonite and removal of organic pollutants such as phenols from water in one-step, which resulted that both surfactants and organic pollutants were removed from water by bentonite. The effects of contact time, pH and inorganic salt on the removal of phenols were investigated. Kinetic results showed that phenols and cetyltrimethylammonium bromide (CTMAB) could be removed by bentonite in 25 min. The removal efficiencies were achieved at 69%, 92% and 99%, respectively, for phenol, p-nitrophenol and beta-naphthol at the initial amount of CTMAB at about 120% cation exchange capacity of bentonite. Better dispersion property and more rapid bentonite sedimentation were observed in the process. The results indicated that the one-step process is an efficient, simple and low cost technology for removal of organic pollutants and cationic surfactants from water. The proposed technology made it possible that bentonite was applied as sorbent for wastewater treatment in industrial scale.
提出了一种新型废水处理技术，该技术基于一步法同时合成有机膨润土并从水中去除酚类等有机污染物，这使得膨润土能够从水中去除表面活性剂和有机污染物。研究了接触时间、pH值和无机盐对酚类去除的影响。动力学结果表明，膨润土能在25分钟内去除酚类和十六烷基三甲基溴化铵（CTMAB）。在CTMAB初始用量约为膨润土阳离子交换容量的120%时，苯酚、对硝基苯酚和β-萘酚的去除效率分别达到69%、92%和99%。在此过程中观察到更好的分散性能和更快的膨润土沉降。结果表明，该一步法是一种从水中去除有机污染物和阳离子表面活性剂的高效、简单且低成本的技术。所提出的技术使得膨润土作为吸附剂应用于工业规模的废水处理成为可能。
