高镁磷尾矿处理氨氮废水的试验探究

Experimental Research on Treatment of Ammonia Nitrogen Wastewater by High Magnesium Phosphate Tailings

高镁磷尾矿的利用率较低,不断堆存会造成环境问题,本文采用高镁磷尾矿处理氨氮废水以达到以废治废的效果。本试验采用了磷酸镁铵化学沉淀法来处理模拟氨氮废水,探究其最佳反应条件,并在此基础上对不同浓度的实际氨氮废水进行处理。在pH=7、n(Mg^(2+))∶n(PO_(4)^(3-))∶n(NH_(4)^(+))=3.8∶1∶0.48、18℃、50 min反应条件下氨氮去除率为98.92%,氨氮浓度达到《污水综合排放标准》中的一级排放标准。对实际氨氮废水进行处理,得到初始氨氮浓度越高,氨氮去除率越高。处理后液体达到了《污水综合排放标准》中氨氮排放的二级排放标准。所得的沉淀物达到了磷酸镁铵肥料级标准,无毒害。

The utilization rate of high-magnesium phosphate tailings is low,and continuous stacking will cause environmental problems.In this paper,high-magnesium phosphate tailings are used to treat ammonia-nitrogen wastewater to achieve the effect of waste treatment.In this experiment,the chemical precipitation method of magnesium ammonium phosphate was used to treat the simulated ammonia nitrogen wastewater,and the optimal reaction conditions were explored,and on this basis,the actual ammonia nitrogen wastewater of different concentrations was treated.Under the conditions of pH=7,n(Mg^(2+))∶n(PO_(4)^(3-))∶n(NH_(4)^(+))=3.8∶1∶0.48,18℃,50 min reaction conditions,the ammonia nitrogen removal rate is 98.92%and the concentration of ammonia nitrogen meets the first-level discharge standard in the“Integrated Wastewater Discharge Standard”.The actual ammonia nitrogen wastewater is treated,and the higher the initial ammonia nitrogen concentration,the higher the ammonia nitrogen removal rate.The treated liquid meets the secondary discharge standard of ammonia nitrogen in the“Integrated Wastewater Discharge Standard”.The obtained precipitate has reached the standard of magnesium ammonium phosphate fertilizer grade and is non-toxic.