生物活性炭滤池炭上氮的分布规律研究

Nitrogen Distribution on Carbon and Its Releasing Potential in Biological Activated Carbon on Drinking Water Treatment

生物活性炭滤池炭内氮素分布特性可能对滤池出水中含氮物质尤其是含氮有机物的浓度产生直接的影响,因此对BHK水厂内正常运行生物活性炭池内炭上氮素的分布特性开展了研究。结果表明:生物活性炭滤池在反冲洗结束刚投入运行时,炭上ω(TN)可达0.66~1.04 mg/g,且随炭层深度增加而减少;在运行后期炭上ω(TN)基本维持在1.39 mg/g左右;炭上TN与生物量密切相关。炭上氮素以含氮有机物为主,其质量分数占TN 90%以上。运行成熟稳定的生物活性炭具有向水中释放氮素的能力,平均释放量为210μg/g,约占炭上含氮有机物平均总量的16.8%。

distribution on carbon and its relative releasing may elevated the effluent concentration of nitrogen, especially the concentration of dissolve organic nitrogen（DON） biological activated carbon process in drinking water treatmenL The distribution of nitrogen and its releasing potential was studied on an actual biological activated carbon process in BHK water treatment plant. Results showed that the total nitrogen（TN ） on carbon was 0.66 - 1.04 mg/g and decreased with depth at the beginning of operation circle. At the late periodthe TN maintained at 1.39 mg/g. The TN concentration was closely related to the biomasson BACDON was the dominant species which accounted for above 90% of nitrogen on carbon. TN releasing potential was measured at 210 μg/g BAC which acoounted for about 16.8 % of TN on carbon. DON was also the dominant species released to water.