摘要
为了有效地去除垃圾渗滤液中高浓度的ＮＨ＋４－Ｎ而避免传统吹脱法造成吹脱塔内的碳酸盐结垢问题，探讨了采用化学药剂诸如ＭｇＣｌ２·６Ｈ２Ｏ和Ｎａ２ＨＰＯ４·１２Ｈ２Ｏ或ＭｇＯ和Ｈ３ＰＯ４使ＮＨ＋４－Ｎ生成磷酸铵镁的化学沉淀去除法．小试研究结果表明，当垃圾渗滤液中投加ＭｇＣｌ２·６Ｈ２Ｏ和Ｎａ２ＨＰＯ４·１２Ｈ２Ｏ而使Ｍｇ２＋∶ＮＨ＋４∶ＰＯ３－４的比例为１∶１∶１时，在最佳ｐＨ为８．５～９．０的条件下原垃圾液中的ＮＨ＋４－Ｎ可由５６１８ｍｇ／Ｌ降低到６５ｍｇ／Ｌ；另外２种药剂ＭｇＯ和８５％的Ｈ３ＰＯ４不如前者有效。
To remove efficiently high strength of ammonianitrogen from landfill leachate and to avoid carbonate scaling problems in a conventional airstripping tower,alabscale study was conducted to precipitate the ammonia in the form of magnesium ammomum phosphate by applying such chemicals as MgCl26H2O and Na2HPO412H2O or MgO and 85% H3PO4 with different stoichiometric ratios.The experimental results demonstrated that NH+4N was effectively removed from initial 5618mg/L down to final 65mg/L when the ratio of Mg2+NH+4PO3-4 was controlled at 111 by using analytical grade chemicals of MgCl26H2O and Na2HPO412H2O,with the optimal pH for the precipitation about 8590.The other two chemicals of MgO and 85% H3PO4 were also tested and found to be not as efficient as MgCl26H2O and Na2HPO412H2O to precipitate NH+4N,which removed NH+4N from initial 5404mg/L only down to final 1688mg/L at the same experimental conditions.
出处
《环境科学》
EI
CAS
CSCD
北大核心
1999年第5期90-92,共3页
Environmental Science
关键词
垃圾渗滤液
氨氮
沉淀
磷酸铵镁
化学沉淀法
landfill leachate,ammonianitrogen,precipitation,magnesium ammonium phosphate.
