矿物材料对城市生活污水中磷的去除

研究几种天然矿物和冶金炉渣对生活污水的除磷效果。结果表明,混合物料用于生活污水除磷的效果极佳,在初期排放水的含磷浓度远远低于国家废水排放标准,但随着处理水量的增加,除磷效果变差,钢渣中含有的大量碱性物质CaO,使出水pH很高,较高的pH与较好的除磷效果相关。     

运行方式对人工快渗系统除污效果的影响

以天然砂作为主要渗滤介质建立污水处理人工快速渗滤系统,分别以洗浴污水、生活污水和受污染河水作为研究对象,在相同的水力负荷条件下,用两种不同的运行方式(定期投配一定量的污水,淹水和落干交替运行)对不同水质的污染物去除效果进行了对比研究.结果表明,通过缩短淹水周期,加大系统淹水和落干的频率,可以明显改善人工快渗系统的污染物去除效果.     

活性硅酸的助凝作用

研究了较佳形态活性硅酸对工业氯化铁、工业PAC助凝时模拟体系的混凝行为.结果表明,较佳形态的活性硅酸具有明显的助凝效果,当有活性硅酸助凝时,体系Zeta电位明显降低,而除浊效率得到明显提高.同时发现在有活性硅酸参与下的混凝机理有别于单纯铝盐或铁盐,活性硅酸的介入会削弱铝盐或铁盐在混凝中的电中和作用,但同时强化了黏接架桥与网捕卷扫的作用机制.     

Influence on shallow ground water by heavy metal in polluted river

The main purpose of the research is to study the influence on shallow ground water by heavy metal in polluted river. In the lab-scale experiment polluted rivers were simulated by domestic sewage, and three kinds of natural sand were chosen as infiltration medium, it was found that Cr（Ⅵ）penetrated on the 13th day and then had a removal ratio of 77%-99% in coarse sand,over 91% and 96% in two kinds of medium sand. From beginning to end in column 2 and column 3 the removal ratio of lead were greater than 97%. It is difficult for Cr（Ⅵ） and lead to enter ground water. In on-site test it indicates that the concentration of Cr（Ⅵ） in No.1-3 and coal yard well along the bank of Liangshui River is not greater than background concentration in groundwater, so Cr （Ⅵ） in Liangshui River has a little influence on ground water. The mechanism of Cr（Ⅵ） removal is reducing action and sedimentation. The removal mechanism of lead primarily is chemical adsorption and generation deposit. Cr（Ⅵ） mainly is transformed to precipitation by reducing action because of abundant reduction agent in the infiltration media, so the tests indicat that polluted river is not the source of Cr （Ⅵ） pollution in ground water. Generally lead may polluted soil, but not groundwater.