PRB技术处理污染地下水的影响因素分析

Analysis of Influencing Factors on in-situ Remediation of Leachate-Polluted Groundwater with PRB Technology

设计了6个可渗透反应屏障(PRB)反应器,分别对污染物在反应器内的滞留时间、反应介质、DO、NO-3 、SO 2- 4、pH、Eh等因素对PRB的影响进行了研究和分析.实验结果表明:在相同条件下,污染物的处理效果与滞留时间直接相关;零价铁对复杂的不可生物降解或难生物降解的有机物向简单有机物的转化起了重要作用,经过反应器后使ρ(BOD5 )/ρ(COD)值从初始0.32增至0.5～0.79,增强了有机物的可生物降解性;不同的辅助反应介质对污染物的去除具有一定的选择性.

Six permeable reactive barrier (PRB) reactors were designed to study the influencing factors such as resident time of contaminants in reactors, reactive media, DO (dissolved oxygen), NO-_3, SO(2-)_4, pH, Eh, etc. on the PRBs. Experiments results indicated that under the same condition, the treatment effect of contaminants directly correlated with retention time of contaminants in rectors; ZVI(zero valent iron) take an important role on decomposing the complex non-biodegradable or difficult biodegradable organics to simple biodegradable organics, which resulted in the increase of the BOD_5/COD values from original 0.32 to range from 0.50.79 and enhance the organics’ degradability. Different reactive media have certain selectivity on contaminants.