【摘要】 以剩余污泥碱性发酵液为研究对象,考察鸟粪石沉淀法(MAP法)同时回收氮磷的最佳条件及对发酵液中有机物的影响.正交试验结果表明,分别以氨氮(NH4+—N)和正磷酸盐(PO43-—P)回收率为考察标准,四个环境因素的显著性分别依次为:nP∶nN>pH>反应时间>nMg∶nP、pH>nMg∶nP>nP∶nN>反应时间.各个环境因素的优化分析结果表明,最佳的回收条件为:pH=10.0、nMg∶nP=1.8、nP∶nN=1.6、反应时间为5 min,此时NH4+—N和的PO43-—P回收率分别为62.3%和94.1%,同时发酵液中的有机物随着鸟粪石沉淀的析出也略有减少.更多还原

【Abstract】 This paper studied the optimal conditions of simultaneous recovery of nitrogen and phosphorus in anaerobic fermentative liquid by magnesium ammonium phosphate precipitation(MAP),and discussed the effects of MAP precipitation on organics.The orthogonal experiments showed that the effects of four operational factors were different for NH4+—N and PO43-—P recovery.For NH4+—N recovery,the operational factors were as follow:nP∶ nN>pH>time> nMg∶ nP,and for PO43-—P recovery,the operational factors were as follow: pH>nMg∶ nP> nP∶ nN>time.The optiming experiments indicated that the best conditions were as follow: the pH was 10.0,nMg∶ nP the was 1.8,the nP∶ nN was 1.6,and the reaction time was 5 min.Adopting these conditions,the recovery efficiency of NH4+—N and PO43-—P was 62.3% and 94.1%,respectively.Then,the concentrations of organics in fermentative liquid were slightly decreased.更多还原