共存杂质对磷酸铵镁结晶法回收磷的影响研究
Effects of coexisting impurities on phosphorus recovery in magnesium ammonium phosphate crystallization
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摘要: 研究用磷酸铵镁(MAP)结晶法去除、回收废水中的磷，分析含磷废水中各类共存杂质对MAP法去除、回收磷的影响。结果表明，废水中无机钙离子的存在可提高磷的去除率，而大分子有机物杂质的存在会使磷的去除率显著降低，小分子有机物对磷的去除基本无影响。在反应体系中引入外来晶种烟煤、石英砂和铁屑可显著提高低浓度含磷废水磷的去除效率，其中烟煤作为晶种的效果最明显。Abstract: Phosphorous(P) in wastewater was removed and recovered as magnesium ammonium phosphate(MAP) crystallization in this study. Coexistence impurities in wastewater affecting the P removal and recovery were investigated. Results showed that the existing of calcium ions increased the removal rate. The macromolecular organic significantly reduced the removal efficiency and the small molecular organic had no influence of the of P removal. The removal efficiency of P enhanced with the addition of quartz sand，iron powder and bitu minous coal seeds. Among these additional seeding materials，bituminous coal could achieve the best results.
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Key words:
- Mg/Al hydrotalcite /
- adsorption /
- trace
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