镁对改善絮凝剂处理工业废水性能研究

Effect on the Magnesium Added Flocculant to the Industrial Wastewater

在优化活化聚硅酸制备工艺基础上,合理确定聚硅酸铝铁硼镁絮凝剂中镁的添加量,研究镁对絮凝剂表观特性及处理工业废水性能的影响。通过响应曲面法设计、开展实验,优化获得活化聚硅酸的最佳制备工艺;改变不同的镁添加量,找出镁的最佳添加剂量,通过絮凝剂储存时间,观察絮凝剂的表观特性;采用3种染料废水和一种焦化废水作为处理对象,对比研究了镁对改善废水化学需氧量(COD)和色度去除性能的影响。结果显示,按nMg∶nSi=0.4∶1加入镁盐的絮凝剂以较快速度凝结成固体形态,对4种工业废水均能获得较好的COD和色度去除效果,对脱色性能的提高更加明显。显示出镁在絮凝剂稳定与提高工业废水脱色性能方面的优势。

The aim of this study confirms the hypothesis that Magnesium added floceulants can improve the performance in wastewater treatment. Based on the optimal preparation of polysilicate by response surface methodology, the experiment was car ried out. During the experiment, by varying the amount of magnesium added,we find the optimum amount of additive magnesium. By contrasting ld and 30d storage time in both cases, we observed the apparent characteristic of flocculant. Three dyes wastewater and one coking wastewater were used to validate the newer magnesium added flocculant by comparative study of COD and color rcmoval performance. The results shows that the newer flocculant with the addition of magnesium of nMg： nsi =0.4：1 has a faster rate cgndense into solid form and the four industrial wastewater can obtain better removal etSciency of COD and color, but the bleaching performance improvement more obvious. Magnesium flocculant shows stability and improve industrial performance advantages Wastewater.