粘土复合聚合氯化铝铁处理高藻水中藻类的实验

Flocculation and Removal of Algae in Urban Lake Water by Chitosan-modified Clays

研究应用粘土复合聚合氯化铝铁(PAFC)絮凝法去除城市湖泊中藻类。结果表明,粘土复合PAFC比单独使用PAFC或粘土对藻类有更好的去除效果,最佳投加量为9ml/L,对叶绿素和浊度的去除率分别达到93.75%和90.09%(白粘土)、90.63%和93.18%(硅藻土)。与单独投加PAFC相比,加入粘土改善了絮体的性能,减少了絮体体积。实验确定了絮凝的最佳工艺及pH值范围。最佳pH值以小于8为佳;合适的快搅速度是300rpm,快搅时间为2min;慢搅速度为30rpm,慢搅时间为15min;以先投加粘土后投加PAFC为佳。

The flocculation and removal of algae in urban lake water by PAFC-modified clays was studied. The algal removal efficiency was greatly improved after the modification with clay. The optimum total loading was 9 ml/L, and the corresponding Chlorophyll-α and turbidity removal rates were 93.75% and 90.09%(with white clay), and 90.63% and 93.18%(with diatomite), respectively. Compared with PAFC alone, the PAFC-modified clays may increase the density of flocs, reduce the volume of flocs, and improve the size distribution of flocs. The algal removal efficiency was better when the pH is less than 8. The appropriate rapid stirring speed was 300 rpm and stirring time was 2 min, while the appropriate slow stirring speed was 30 rpm and stirring time was 15 min. The proper feeding order is clay added first and then PAFC.