Fenton法-聚合氯化铝预处理高浓度乳化液废水  

Pretreatment of High Concentration of Emulsified Liquid Waste Water Using the Fenton Method and Poly Aluminium Chloride

作　　者：王汉道[1] 冯振杰 赵娜[1] 

机构地区：[1]广东轻工职业技术学院环境工程系,广东广州510300 [2]广州世洁设备租赁服务有限公司,广东广州510725

出　　处：《生态环境学报》2014年第8期1327-1331,共5页Ecology and Environmental Sciences

摘　　要：乳化液在机械制造、加工等过程中有广泛的应用,主要起润滑、冷却、表面清洗和防腐蚀作用。其主要成分为矿物油、表面活性剂、抑菌剂和其他有机添加剂,在使用过程中产生了高浓度、乳化严重、成分复杂且波动大的乳化液废水,随意排放会对环境造成严重污染;目前国内外对低浓度含油废水的处理进行了大量的研究工作,如各种破乳法、微生物法等,但各种处理方法都有其局限性,尤其对高浓度乳化液废水尚没有定型的处理方法。Fenton氧化法是一种高级氧化技术,在酸性条件下,H2O2被Fe2+催化分解并产生大量具有强氧化性的?OH,通过?OH氧化降解废水中的有机物,达到废水净化的目的。在处理有毒有害难生物降解有机废水方面具有较强的应用优势;聚合氯化铝(PAC)是一种应用很广的无机高分子絮凝剂,与其它水处理剂配合使用具有更好的水处理效果,通过Al(Ⅲ)盐水解-聚合产物对水中胶体颗粒或胶体污染物进行电性中和、脱稳和吸附架桥作用生成粗颗粒絮凝体去除,从而达到净化污水的目的;本文采用Fenton法-聚合氯化铝组合工艺预处理机械加工厂高浓度乳化液废水以满足后续生化处理进水要求,通过实验研究了Fenton法涉及的初始反应pH值、H2O2投加量、硫酸亚铁投加量、反应时间和后续投加聚合氯化铝涉及的反应pH值、PAC投加量及反应时间对乳化液废水预处理效果的影响。结果表明,Fenton法处理乳化液废水的最佳反应条件为:pH值为2、H2O2投加量为48 mL·L-1、质量分数为10%的FeSO4投加量为88 mL·L-1和反应时间为60 min;后续投加PAC处理的最佳反应条件为:pH值为7、质量分数为10%的PAC投加量为466 mL·L-1、反应时间为40 min;乳化液废水COD约34000 mg·L-1,经Fenton法-聚合氯化铝组合工艺处理后处理水COD小于5 000 mg·L-1,COD去除率达到87%以上,色度从浑浊的乳白色变成了清澈的无色Emulsion has received frequent usage in the proceeding of machine building and operation, for its role of lubrication, cooling, surface cleaning and corrosion prevention. The principal constituents are mineral oils, surface-active preparations, bacteria inhibitor and other organic additions. There is high concentration, over emulsification, complicated compositions and large fluctuation of emulsion wastewater during use. Willfully effluent would cause serious environment pollution. At present, there are lots of researches about the treatment of low concentration oily wastewater at home and abroad, such as emulsion breaking microbial catalyzing, and so on. However, all of these treatment methods have certain limitations, especially for the high concentration emulsion wastewater. Fenton method is an advanced oxide technique. Under the acidic conditions, H2O2 is catalytically decomposited and comes into lots of strong oxidizing ？OH, which can degrade the organic matters in wastewater to purificate wastewater. This method has strong predominance to treat hazardous, toxic and hard to biological degradation of organic wastewater. As PAC is a very useful inorganic polymeric flocculant, there will be better effects when it is used in conjunction with other water treatment chemicals. Through Al（Ⅲ） salt hydrolysis product to neutralize electricity and absorb the colloidal solid or colloidal pollutants to clean wastewater. In the paper, Fenton method - PAC was adopted to pretreat high concentration emulsified wastewater of mechanical plant to meet the water requirements of the subsequent biological treatment. The experiment studies the initial pH of reaction, H2O2 dosage, dosage of ferrous sulfate and reaction time involved in Fenton method, and the amount of follow-up PAC dosing, which involves the pH of reaction, PAC dosage and reaction time, and those effects on emulsified wastewater pretreatment. The results show that the optimal reaction conditions of Fenton treatment are as follows：pH value is 2, H2O2 dosage

关 键 词：FENTON法 聚合氯化铝 机械加工厂乳化液废水 预处理 

分 类 号：X703.1[环境科学与工程—环境工程]