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针对某煤矿富含高岭土的矿井水难以处理的问题,对絮凝剂PAM和PAC的选用及最佳投量进行了试验。结果表明:阳离子PAM的絮凝效果显著优于阴离子、非离子PAM的;原采用的普通型PAC配合PAM不能有效去除高岭土颗粒,而高效液体型PAC在投加量仅为普通型PAC的1/3的条件下,处理出水浊度可降至4.2～8.4 NTU。因此,实际工程确定选用阳离子PAM和高效液体型PAC药剂,投加量分别为0.25、50 mg/L,处理效果得到了显著提高,但反渗透进水SDI值仍常有超过3的情况出现。为此,在一级过滤泵前增加二次絮凝工艺(投加3～5 mg/L的PAC),保证反渗透进水SDI值稳定在3以下,达到了设计要求。
Aiming at the problem of difficult treatment of mine water with kaolin in a coal mine, the selection and the best dosage of flocculants PAM and PAC were tested. The results showed that the flocculation effect of cationic PAM was significantly better than that of anionic and nonionic PAM. The original PAC and PAM were not effective in removing kaolin particles. However, the dosage of high efficiency liquid PAC was only 1/3 of normal PAC Under the conditions, the treated water turbidity can be reduced to 4.2 ~ 8.4 NTU. Therefore, the actual project to determine the choice of cationic PAM and high-performance liquid PAC agent dosage were 0.25,50 mg / L, the treatment effect has been significantly improved, but the SDI value of reverse osmosis water often more than 3 cases occur. To this end, the secondary flocculation process (adding 3 ~ 5 mg / L of PAC) is added before the primary filtration pump to ensure that the SDI value of the reverse osmosis influent water is stable below 3, meeting the design requirements.