磷酸铵镁沉淀法回收猪场废水中氮磷的中试研究-《郑州大学学报(工学版)》

文章信息/Info

Title:: A Medium-Scalestudy of Recovery of Nitrogen and Phosphorus by Struvite Crystallization from Swine Wastewater

作者:: 王岩; 彭凯; 王克科.; 郑州大学化工与能源学院,河南郑州,450001, 郑州大学化工与能源学院,河南郑州,450001, 郑州大学化工与能源学院,河南郑州,450001

Author(s):: WANG Yan; PENG Kai; WANG Ke-ke; School of Chemical Engineering and Energy , Zhengzhou University ,Zhengzhou 450001，China

Keywords:: swine farm wastewater; magnesium ammonium phosphate; Na; PO; · 12H; O

摘要:: 针对猪场废水传统脱氮除磷生物处理工艺中碳源不足、氮含量过高等问题,采用磷酸铵镁(MAP)结晶法回收猪场废水中的部分氮、磷,目的在于提高废水中碳氮比,为后续生物处理奠定基础.在选择投加MgCl2·6H2O和Na3 PO4·12H2O为镁源和磷源时,试验结果表明:MAP法回收猪场废水中氮磷的最优反应条件为n(Mg)∶n(N)∶n(P)=1.2∶1∶0.9;此条件下回收的沉淀物中N的含量约4.1％,P2O5的含量约40.77％,MgO的含量约15.85％,是一种高品质缓释性肥料;经回收后的废水pH能维持在8.5左右,n(BOD5)∶ n(N)∶ n(P) =95∶ 5∶1,余氮浓度在170 mg/L左右,余磷浓度在20 mg/L左右,适合用生物法继续处理.

Abstract:: In view of the problems of shortage of carbon source and excess of nitrogen content in traditional ni-trogen and phosphorus removal,this paper adopts the method of magnesium ammonium phosphate (MAP)crystallization to recover a part of N and P to increase the ratio of carbon to nitrogen,which is beneficial forfollowing biological treatment. The results show that the optimal reaction condition,the molar ratio of n(Mg):n(N):n(P)=1.2∶1:0.9, was obtained through single factor experiment when choosing MgCl2·6H,0 Na,PO·12H,0 as magnesium source and phosphorus source. In this condition , the content of N, P, 0, and MgOof the sediment，slow-release organic fertilizer,recovered is 4.1 % , 40.77% and 15.85% , respectively.Af-ter recovering,the pH of the wastewater is about 8.5，the ratio of n( BOD,): n(N):n(P) almost 95: 5:1,the concentration of residual nitrogen and phosphorus approximately 170 mg/L and 20 mg/L, it can be reducedby with by microorganism treatment.