中文摘要：

对多家煤矿井下废水进行了采样分析，并对典型水样进行了混凝特性试验，考察了水样初始pH值、混凝剂投加量以及助凝剂投加量对混凝效果的影响。试验结果表明，偏酸性有助于PAC混凝效果的发挥。对浊度为1395NTU、SS的质量浓度为448nmg/L的煤矿井下废水，在PAC投加量为100mg／L时，混凝对水样浊度和SS的去除率分别达到99．3％和95．5％。助凝剂PAM的加入对水样Zeta电位和电导率作用不显著，但能通过吸附架桥作用在PAC投加量较小时促进水中颗粒的沉降。当PAC投加量为40mg／L。PAM投加量为2mg／L时．对水中浊度和SS的去除率分别达到99．4％和96．9％。

英文摘要：

A number of coalmine wastewater samples were analyzed, and a cogulation test of typical water samples was carried out, the influences of initial pH value, coagulant dosage, and coagulant aids dosage on coag- ulation effect were investigated. The results of the test showed that, weak acidic condition was beneficial to PAC coagulation. For the treatment of the coalmine wastewater with turbidity of 1 395 NTU and SS mass concentration of 448 mg/L, when the PAC dosage was 100 mg/L, the removal rates of turbidity and SS by coagulation reached 99.3% and 95.5% respectively. The coagulant aid PAM could not impact the Zeta potential and the conductivity of the water samples significantly; however, with less PAC dosage, the sedimentation of particles in water could be promoted through adsorption bridging. When the dosage of PAC and PAM were 40 and 2 mg/L respectively, the removal rates of turbidity and SS reached 99.4% and 96.9% respectively.