摘要
探讨了磷酸铵镁沉淀法处理磷酸盐工业废水的可行性。研究了pH值、反应物摩尔比、搅拌速度、反应时间、陈化时间等因素对磷酸盐去除效果和氨氮残留量的影响。实验得出,在外加MgSO4.7H2O和NH4Cl处理磷酸盐浓度为1753.46 mg/L的磷酸盐工业废水时的较佳实验条件为:搅拌速度为200 r/min左右,反应时间为20 min,pH=9.5,n(Mg)∶n(P)∶n(N)=1.4∶1.11∶1.0。在陈化时间为30 min以及在上述实验条件下,磷酸盐的去除率为98.69%,处理水中的残磷量为9.16 mg/L,残氮量为64.10 mg/L。并对所得沉淀物进行了X衍射光谱和扫描电镜分析。
The feasibility of the treatment of phosphate wastewater by the magnesium ammonium phosphate （MAP） precipitation process was discussed. Some factors affecting the result of removal of ammonium and phosphate, such as pH, molar ratio, reaction time, stirring speed, precipitation time were discussed. When treating the phosphate wastewater with PO4^3- -P 1753.46 mg/L by adding MgSO4 ·7H2O and NH4Cl, the better treatment conditions were as follows： pH=9.5, n（Mg） ： n（P） ： n（N）= 1.4 ： 1.11： 1.0, stirring speed about 200 r/min, reaction time 20 min. When precipitation time was 30 min, the removal ratio of PO4^3- was 98.69%. The quantity of PO4^3--P in the treated water was 9.16 mg/L. The quantity of NH3-N in the treated water was 64.10 mg/L. Sediment was confirmed by scanning microscopy （SEM） and energy dispersive X-ray spectroscopy （EDS）.
出处
《化工进展》
CAS
CSCD
北大核心
2008年第4期558-563,共6页
Chemical Industry and Engineering Progress
基金
国家自然科学基金资助项目(50378095)
关键词
磷酸铵镁
磷酸盐废水
磷酸盐
氨氮
影响因素
magnesium ammonium phosphate： phosphate wastewater
ammonia-nitrogen
phosphate
affecting factors
