苦卤-鸟粪石沉淀法预处理垃圾渗滤液
PRETREATMENT OF LANDFILL LEACHATE BY THE BITTERN- MAGNESIUM AMMONIUM PHOSPHATE PRECIPITATION METHOD
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摘要: 以苦卤为新型镁沉淀剂,改性沸石为晶种,对鸟粪石沉淀法预处理高浓度氨氮垃圾渗滤液进行实验研究.结果表明:当n(Mg):n(N):n(P)=1.3:1.0:1.1,氨氮去除率为96.2%;铁沸石晶种在3.5g/150ml时氨氮的去除率增加到了97.88%.对新型镁沉淀剂成本分析表明,苦卤和改性沸石作鸟粪石沉淀剂和晶种是可行的.
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关键词:
- 鸟粪石沉淀法(MAP) /
- 苦卤 /
- 晶种 /
- 垃圾渗滤液 /
- 预处理
Abstract: A new magnesium ammonium phosphate (MAP) method is described as a pretreatment for landfill leachates with highly concentrated ammonia nitrogen, with Na2HPO4 as phosphate ions and the bittern as a new substitute for magnesium precipitation agent. Within the time of 25 min, under the conditions of pH8.5, n(Mg2+):n(NH4+):n(PO43-) = 1.3:1:1.1, the removal rate of NH3-N at the stirring speed 250r·min-1can remain as high as 96.2%, while the residual phosphorus content was 13.58 mg·l-1. Ammonia nitrogen removal rate increased to 97.88% after iron-zeolite crystal seed was added at a dose of 3.5g/150ml. Furthermore, cost analysis shows that using the bittern as magnesium precipitation agent has a certain advantage on cost.-
Key words:
- MAP /
- bittern /
- crystal seed /
- landfill leachate /
- pretreatment
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