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Nitrification and denitrification in biological activated carbon filter for treating high ammonia source water

Frontiers of Environmental Science & Engineering 2008年第1期2卷 94-98页

作者： Jianguang LIU Xiaojian ZHANG Zhansheng WANG Department of Environmental Science and Engineering Tsinghua UniversityBeijing 100084China School of Public Works and Environmental Engineering Shandong Jianzhu UniversityJinan 250101China

Since the ammonia in the effluent of the tradi-tional water purification process could not meet the supply demand,the advanced treatment of a high concentration of NH4+-N micro-polluted source water by biological activated carbon filter(BACF)was *** filter was operated in the downflow manner and the results showed that the remov-ing rate of NH_(4)^(+)-N was related to the influent concentration of NH_(4)^(+)-*** removing rate could be higher than 95%when influent concentration was under 1.0 mg/*** could also decrease with the increasing influent concentration when the NH_(4)^(+)-N concentration was in the range from 1.5 to 4.9 mg/L and the dissolved oxygen(DO)in the influent was under 10 mg/L,and the minimum removing rate could be 30%.The key factor of restricting nitrification in BACF was the influent *** the influent NH_(4)^(+)-N concentration was high,the DO in water was almost depleted entirely by the nitrifying and hetetrophic bacteria in the depth of 0.4 m filter and the filter layer was divided into aerobic and anoxic *** nitrification and degradation of organic matters existed in the aerobic zone,while the denitrification occurred in the anoxic *** to the limited carbon source,the denitrifica-tion could not be carried out properly,which led to the accu-mulation of the denitrification intermediates such as NO_(2)^(−).In addition to the denitrification bacteria,the nitrification and the heterotrophic bacteria existed in the anoxic zone.

关键词： biological activated carbon micro-polluted source water nitrification denitrification

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