炭砂滤池去除硝基苯等微污染有机物的研究

Study on Removal of Nitrobenzene and Other Organic Micro-pollutants in Carbon-sand Filter

采用炭砂滤池处理受硝基苯等有机物污染的松花江原水,在保证水厂原运行参数不变的条件下,通过50d的跟踪生产运行,考察了炭砂滤池对浊度和CODMn的去除效果,同时通过活性炭对硝基苯等7种有机物的静态吸附试验,分析了活性炭去除各种有机物的难易程度。结果表明,当进水浊度为2.4～5.3NTU、CODMn为2.34～4.36mg/L时,出水浊度始终保持在0.6～1.0NTU、CODMn为1.72～3.54mg/L,保证了炭砂滤池优质的出水水质。由不同吸附时间下活性炭对有机物的吸附率可知,在7h之前,活性炭对硝基苯的吸附率最低,这说明硝基苯较其他6种有机物的处理难度大,但只要保证一定的吸附时间,硝基苯也可被有效去除。

Carbon-sand filter was used to treat Songhua River raw water polluted by organic pollutants such as nitrobenzene. The removal efficiencies of turbidity and CODMn in carbon-sand filter were investigated by keeping the original operation parameters of the waterworks in a 50-day production run. The removal efficiency of different organics by activated carbon were analyzed in static adsorption tests for seven kinds of organics. The results show that when the influent turbidity and CODMn are 2.4 to 5.3 NTU and 2.34 to 4.36 mg/L respectively, the effluent turbidity and CODMn are 0.6 to 1.0 NTU and 1.72 to 3.54 mg/L respectively, ensuring high-quality effluent of the carbon-sand filter. From the adsorption rates of organics at different adsorption times, it is found that before 7 h, the adsorption rate of nitrobenzene on activated carbon is the lowest, meaning that nitrobenzene is more difficult to be removed than six other organics. But it still can be effectively removed by the activated carbon if the adsorption time is long enough.