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研究了饮用水预氯化工艺对去除NH+4-N和NO-2-N、滤池功能微生物量及生物活性、滤后水三氯甲烷生成量的影响。当预加氯投量为0.2 mg/L时,对NH+4-N的去除率最高为87.8%,NO-2-N含量均在0.002 mg/L以下,出水水质稳定,不会间歇性出现滤后水含量高于待滤水的现象。在该条件下滤池生物量最大,硝化菌、亚硝化菌的OUR分别达到8 611和2 545μg/g,此时滤池生物量呈现随深度增加而不断减少的层状分布,生物活性则是中层最强,上层次之,下层最弱。此外,预加氯量升高后,滤后水的三氯甲烷生成量随之增加,当投加量为0.2 mg/L时三氯甲烷含量仅为0.016 mg/L。
The effects of pre-chlorination process of drinking water on the removal of NH + 4-N and NO-2-N, the functional microbial biomass and bioactivity of the filter and the production of chloroform after filtration were studied. When the pre-chlorination dosage is 0.2 mg / L, the removal rate of NH + 4-N is up to 87.8% and the content of NO-2-N is below 0.002 mg / L, the effluent quality is stable and will not intermittently appear After filtering the water content is higher than the phenomenon of water to be filtered. Under these conditions, the maximum biomass of the filter was obtained. The OUR of the nitrifying bacteria and the nitrosomonas reached 8 611 and 2 545 μg / g, respectively. At this time, the biomass of the filter showed a layered distribution with decreasing depth and the bioactivity was The strongest middle, upper, lower weakest. In addition, the amount of chloroform produced in the filtered water increased with the increase of pre-chlorination, and the content of trichloromethane was only 0.016 mg / L when the dosage was 0.2 mg / L.