混凝-活性炭-膜工艺处理黄磷化工渗滤液的研究

Integrated coagulation-carbon adsorption-membrane separation process for treatment of yellow phosphorus industry leachate

采用混凝—活性炭—膜工艺对黄磷化工渗滤液进行处理,重点考察了该工艺对有机物的去除机制。实验结果表明,混凝剂硫酸铝的投加量为0.2g/L时,渗滤液中各污染物去除率较好;颗粒活性炭对渗滤液中有机物的吸附容量几乎不受渗滤液pH的影响,吸附等温线更符合修正的Freundlich模型,拟二级动力学模型能更好地定量描述有机物在颗粒活性炭上的吸附过程;膜处理进一步提高了剩余有机物和其他污染物的去除率。

An integrated coagulation-activated carbon adsorption-membrane separation system was employed for treatment of the yellow phosphorus industry leachate to explore the mechanisms of organics removal and to determine the effects of major operating parameters on the treatment effectiveness. The treatment began with in-line addition of 0.2 g/L of aluminum sulfate, the preferred dose as identified in a coagulation study, to achieve the desired coagulation and SS removal in a sand filter, followed by carbon adsorption in an adsorber, and finally by membrane separation in the 3-component unit for the sequential polishing treatment of uhrafihration, nanofihration and reverse osmosis. The influent pH had only a minor effect on the TOC removal of the adsorber. The experimental adsorption capacity data were best fitted by the modified Freundlich adsorption isotherm model and that the adsorption rate data were best fitted by the pseudo second order kinetic model. The 3-component membrane separation unit further enhanced the treatment effectiveness process.