To efficiently remove nitrogen and phosphorus from highly concentrated livestock and poultry wastewater, an MAP (magnesium-ammonium-phosphate) sedimentation method coupled with ultrasonic technology is used. Studies have been done to explore optimal conditions for use of the method through controlling and regulating pH, ra( Mg2+ ):n( NH4+ ): n( PO43- ) and duration of the reaction. Results show that the MAP sedimentation method may achieve its best effect within the first 10 min of reaction, removing 95. 10% of ammonia nitrogen and 97. 40% of phosphorates in wastewater, when pH is controlled at 9. 5, and n( Mg2+ ): n( NH4+ ): n(PO43- ) at 1.2=1:1. Moreover, when the method is coupled with 60 W ultrasonic irradiation for 6 hours and increased aeration of 200 L·h-1, its N removing efficiency can be further improved up to 98%.%研究磷酸铵镁(MAP)沉淀法与超声波技术相联合处理高浓度畜禽废水的最佳反应条件.结果表明,MAP沉淀法在pH值9.5、n(Mg2+):n(NH+4)∶n(PO43-)=1.2∶1∶1、反应时间10 min时脱氮除磷效果最佳,氨氮去除率为95.10％,磷酸盐去除率为97.40％.MAP沉淀与超声波辐照联合处理最佳条件下,同时增加曝气(流量为200L·h-1),6h时氨氮去除率可提高到98％.
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