%0 Journal Article
%T Struvite crystallization for recovering ammonia nitrogen from landfill leachate<br>鸟粪石结晶法回收垃圾渗滤液氨氮研究
%A Zhang Jishi
%A Wang Yusong
%A <br>张记市
%A 王玉松
%J 环境工程学报
%D 2009
%I 
%X A lab-scale study was conducted to precipitate the ammonia from landfill leachate in the form of magnesium ammonium phosphate( MAP) by applying such chemicals as MgSO_4·7H_2O and Na_2HPO_4·12H_2O. The influences of pH value, reactive time and concentration on removal rate of ammonia nitrogen were tested. Results showed that the feasible pH values of crystallization and precipitation were between 9 and 9. 5. The struc-ture of struvite crystallization was destroyed under high pH value condition resulted in ammonia nitrogen dissocia-ting from MAP, which reduced the removal rate of ammonia nitrogen. Results also demonstrated that ammonia nitrogen was effectively reduced from initial 3 500mg/L to final 175 mg/L, which removal efficiency reached 95% with crystallization and precipitation method when the optimal pH, precipitation time mole ratio of Mg~(2+) , NH_4~+ ,PO_4~(3-) were 9. 5, 25 min and 1.5:1:1.5 respectively. Results also showed that MAP hardly absorbed heav-y metal during struvite and crystallization, which was an excellent fertilizer-controlled release.
%K landfill leachate
%K ammonia nitrogen
%K struvite
%K crystallization<br>填埋渗滤液
%K 氨氮
%K 鸟粪石
%K 结晶
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=3FF3ABA7486768130C3FF830376F43B398E0C97F0FF2DD53&cid=92E6F4267FD4CBCB51B1E49E014D8054&jid=3567BD61129AA59043F5DE01F8815DB5&aid=6E673F72E2AB576DE083572AE59CC7E0&yid=DE12191FBD62783C&vid=38B194292C032A66&iid=708DD6B15D2464E8&sid=FA004A8A4ED1540B&eid=0D1D160AB8016934&journal_id=1673-9108&journal_name=环境工程学报&referenced_num=3&reference_num=9