%0 Journal Article
%T Mechanism of NH4+-N Removal in Drinking Water Biofilter<br>氨氮在饮用水生物滤池内的去除机制
%A LIU Bing
%A FAN Hui
%A YU Guo-zhong
%A YU Xin
%A ZHAO Cheng-mei
%A LI Qing-fei
%A ZHANG Shu-ting
%A WEI Bo
%A <br>刘冰
%A 范辉
%A 余国忠
%A 于鑫
%A 赵承美
%A 李清飞
%A 张舒婷
%A 魏博
%J 环境科学
%D 2012
%I 
%X In order to explore the mechanism of NH4+-N removal in drinking water biofilter, water quality parameters, such as NH4+-N, NO2--N, NO3--N, total phosphorus, permanganate index, nitrogen gas, temperature and dissolved oxygen etc, were determined in the inflow and outflow of biofilter. Samples of granular activated carbon (GAC) at different height (0, 10, 20, 40, 60 cm) of the biofiter media were collected and analyzed for the bacterial community with molecular biology techniques. The bacterial diversity in the activated carbon biofilm sample was studied based on the phylogenetic analysis of sequences. The results showed that there were three stages according to the NH4+-N concentration in the influent. The "nitrogen loss" phenomenon (total inorganic nitrogen in the effluent was less than that in the influent) occurred at the first, second and third stages and the amount of nitrogen loss were 0.94, 0.32 and 0.15 mg·L-1, respectively. The amount of nitrogen loss had a good positive correlation with the NH4+-N concentration in the influent, but not a linear relationship with the concentration of the permanganate index in the influent. The average concentrations of N2increased gradually with the height of media in the biofilter, with values of 14.04 and 14.67 mg·L-1 in the influent and the effluent, respectively. Based on the sequencing results, the ammonia-oxidizing bacteria (AOB) in the activated carbon biofilm were classified into three common genera: Nitrosococcus, Nitrosomonas and Nitrosospira. When the NH4+-N concentration in the influent was relatively high, the "nitrogen loss" phenomenon in biofilter was caused by the AOB.
%K drinking water biofilter
%K nitrogen loss phenomenon
%K molecular biology
%K removal of NH4+-N
%K nitrogen gas<br>饮用水生物滤池
%K 氮亏损现象
%K 分子生物学
%K NH4+-N去除
%K 氮气
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=3FF3ABA7486768130C3FF830376F43B398E0C97F0FF2DD53&cid=A7CA601309F5FED03C078BCE383971DC&jid=64CD0AA99DD39F69401C615B85F123EF&aid=470342632029DB6A5DB348387520D0CA&yid=99E9153A83D4CB11&vid=27746BCEEE58E9DC&iid=DF92D298D3FF1E6E&sid=A1B83061CB0C2A69&eid=5E0F3ED2D12BB989&journal_id=0250-3301&journal_name=环境科学&referenced_num=0&reference_num=19