Research on Treatment of High Ammonia Nitrogen Pharmaceutical Wastewater by Magnesium Ammonium Phosphate Precipitation
The magnesium ammonium phosphate(MAP)precipitation process was used to treat high ammonia nitrogen pharmaceutical wastewater and simulated wastewater. The results show that under the optimum treatment condition of p H 9.0 ~10.0,Mg ∶N ∶P molar ratio 1.2 ∶1 ∶1,the ammonia-nitrogen removal rate was above 90%. The use of Na H2PO4 or Na2HPO4needed to add alkali regulation,and alkali does not need to add when Na3PO4 is used. Under the experimental conditions,1mg N needs 14.5 mg Mg Cl2·6H2O and 27.2mg Na3PO4·12H2O for treatment,and bring MAP precipitation 17.5 mg. This method lays the foundation for the subsequent biochemical treatment of high concentration ammonia nitrogen wastewater.
【CateGory Index】： X787