人工快速渗滤技术净化微污染水的试验研究

Experimental study on the treatment of slightly -polluted water by constructed rapid infiltration system

采用人工快速渗滤技术净化河道微污染水。渗滤柱内介质分别为不同厚度的火山岩、粗砂、铁矿砂和直径不等的砾石。粗砂滤柱出水水质NH3－N在0．05mg／L以下，TN在1mg，L以下，CODcr在（15～40）mg／L范围，TP在0．1mg／L以下，叶绿素a在2mg／L以下；砾石滤柱出水水质NH3-N在0．05mg／L以下，TN在1．5mg／L以下，CODQ在35mg／L左右，TP在0．1m玑以下，叶绿素a在（1～5）mg／L范围。粗砂滤柱与砾石滤柱对微污染水的去除效率基本相同．但砾石滤柱渗透系数与粗砂滤柱相比．大了2个数量级.

The slightly-polluted river water was purified by infiltration through the different thickness medium, which is considered as the constructed rapid infiltration treatment system, of volcanic rock, coarse sand, ore sand and various diameters of gravels. The results show that the effluent concentrations of NH3-N, TN, TP and Chlorophyll were less than 0.05 mg/L, lmg/L, 0.1 mg/L and 2 mg/L respectively and CODcr ranged from 15 mg/L to 40 mg/L after the infiltration of coarse sand. Moreover, the effluent concentrations of NH3-N, TN, CODcr and TP were less than 0.05 mg/L, 1.5 mg/L, 35 mg/L, and 0.1 mg/L respectively and the Chlorophyll ranged from 1 mg/L to 5 mg/L after the infiltration of gravel filtration column. For the removal rate of pollutants, the gravels are almost the same as the coarse sand. However, for the permeability coefficient, the former is two orders of magnitude higher than the later.