| 化学沉淀法去除垃圾渗滤液中的氨氮 |
| 摘要点击 1719 全文点击 3545 投稿时间：1998-10-17 |
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| 中文关键词 垃圾渗滤液 氨氮 沉淀 磷酸铵镁 |
| 英文关键词 landfill leachate ammonia-nitrogen precipitation magnesium ammonium phosphate |
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| 中文摘要 |
| 为了有效地去除垃圾渗滤液中高浓度的NH4+-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NH4+-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+:NH4+:PO43-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NH4+-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,在同等条件下只能使NH4+-N由5404mg/L降低到1688mg/L。 |
| 英文摘要 |
| To remove efficiently high strength of ammonia-nitrogen from landfill leachate and to avoid carbonate scaling problems in a conventional air-stripping tower,alabscale study was conducted to precipitate the ammonia in the form of magnesium ammomum phosphate by applying such chemicals as MgCl2·6H2O and Na2HPO4·12H2O or MgO and 85% H3PO4 with different stoichiometric ratios.The experimental results demonstrated that NH4+-N was effectively removed from initial 5618mg/L down to final 65mg/L when the ratio of Mg2+:NH4+:PO43- was controlled at 1:1:1 by using analytical grade chemicals of MgCl2·6H2O and Na2HPO4·12H2O,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 MgCl2·6H2O and Na2HPO4·12H2O to precipitate NH4+-N,which removed NH4+-N from initial 5404mg/L only down to final 1688mg/L at the same experimental conditions. |
