%0 Journal Article
%T Transformation of Inorganic Nitrogen in Slag-wetland During the Start-up Period<br>钢渣构造人工湿地运行初期无机氮转化特点研究
%A SUN Shu-ming
%A SHAN Bao-qing
%A PENG Wan-jiang
%A <br>孙书明
%A 单保庆
%A 彭万疆
%J 环境科学
%D 2009
%I 
%X Lab-scale subsurface flow slag-wetlands were constructed to study the removal efficiency and transformation processes of low-concentration inorganic N during the start-up period. As for ammonium-dominated wastewater,the removal rates of total nitrogen (TN),ammonium nitrogen (NH+4-N),nitrate nitrogen (NO-3-N) and nitrite nitrogen (NO-2-N) were 0.12 g·(m2·d)-1,0.07 g·(m2·d)-1,0.10 g·(m2·d)-1 and 0.04 g·(m2·d)-1,respectively. Nitrifying bacteria was not detected by fluorescence in situ hybridization (FISH) on the slag. NH3 volatilization is the main contribution for N removal resulting from high pH (>10) and surface soil absorbed most of NH3. For nitrate-dominated wastewater,the removal rates of TN and NO-3-N were 0.23 g·(m2·d)-1 and 0.48 g·(m2·d)-1,and NO-2-N accumulated by 0.22 g·(m2·d)-1 during the process of denitrification. Removal efficiency of inorganic N for nitrate-dominated wastewater was higher than that for ammonium-dominated wastewater during the start-up period of slag-wetlands,so steel slag can be used as a substrate in constructed wetlands for extensive treatment of nitrate pollution.
%K steel slag
%K subsurface wetland
%K ammonium-dominated wastewater
%K nitrate-dominated wastewater
%K denitrification<br>钢渣
%K 潜流湿地
%K 氨氮型污水
%K 硝氮型污水
%K 反硝化
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=3FF3ABA7486768130C3FF830376F43B398E0C97F0FF2DD53&cid=A7CA601309F5FED03C078BCE383971DC&jid=64CD0AA99DD39F69401C615B85F123EF&aid=4A2488EF95D194CF19B24415A234B8B9&yid=DE12191FBD62783C&vid=340AC2BF8E7AB4FD&iid=94C357A881DFC066&sid=A621DEC64CBC4DA1&eid=700C99D38A660C7C&journal_id=0250-3301&journal_name=环境科学&referenced_num=0&reference_num=23