作　　者： ; ;

机构地区： 暨南大学理工学院环境工程系

出　　处： 《工业用水与废水》 2011年第6期28-32,共5页

摘　　要： 采用鸟粪石沉淀法回收高浓度含磷废水中的磷,以MgCl2.6H2O和NH4Cl作为沉淀剂,考察了pH值、搅拌速率、反应时间、沉淀时间、镁磷物质的量之比、氮磷物质的量之比对磷的去除效果及氨氮残留量的影响。结果表明,最优反应条件为:pH=9.5,n(Mg)∶n(N)∶n(P)=1.25∶1.05∶1,搅拌速率为200 r/min左右,反应时间为20 min,沉淀时间为20 min,此时磷的去除率可达99.96%,残留磷的质量浓度为2.20 mg/L,氨氮的残留量相对较低。生成的沉淀产物中P2O5的质量分数可达28.18%,可作为高品位的磷矿或者缓释肥,从而实现高浓度含磷废水中磷的资源化利用。 Struvite precipitation method with MgCl2·6H2O and NH4Cl as the precipitating agents was used to recover phosphorus from high concentration phosphorus-containing wastewater. The influences of pH value, stirring speed, reaction time, precipitation time, magnesium-phosphours ratio and nitrogen-phosphorus ratio on phosphorus removal and residual amount of ammonia nitrogen were investigated. The results indicated that, the optimal operation condition was as follows： the pH value was 9.5, the n（Mg） ： n（N） ： n（P） was 1.25 ： 1.05 ： 1, the stirring speed was about 200 r/rain, the reaction time was 20 min, the precipitation time was 20 min. Under the above condition, the removal rate of phosphorus reached 99.96%, the mass concentration of residual phosphorus was 2.20 mg/L, and the residual amount of ammonia nitrogen was relatively low. The P2O5 in the precipitates has a mass fraction of 28.18%, and could be used as high grade phosphate ore or slow-release fertilizer. The said technology could realize the resource utilization of phosphorus in high concentration phosphorus-contaning wastewater.

关 键 词： 鸟粪石沉淀法 高浓度含磷废水 磷回收

领　　域： [环境科学与工程] [环境科学与工程]