典型氧化剂与硫酸亚铁联用去除水中磷的效能分析

Phosphate Removal by Combined Use of Typical Oxidant and Ferrous Sulfate

采用不同氧化剂(H2O2,NaClO,KMnO4,O3和O2),建立相应氧化剂与FeSO4联用工艺,对比了不同氧化剂与FeSO4联用工艺去除水中磷的效能。结果表明,H2O2-FeSO4,NaClO-FeSO4,KMnO4-FeSO4,O3-FeSO4和O2-FeSO4对磷均有一定的去除作用,但去除效果不同。氧化剂-FeSO4工艺对磷的去除效果均随溶液pH值的升高而降低,随铁盐投量的增加而增加。各工艺对磷的吸附去除率明显低于混凝沉淀对磷的去除率,其对磷的去除为络合沉淀和吸附作用的共同结果。研究证明:氧化剂-FeSO4工艺除磷具有可行性,且KMnO4-FeSO4工艺具有广阔的应用前景。

Oxidant-FeSO4 processes are established by different oxidants （including H2O2,NaC1O,KM-nO4,Oa and O2） and FeSO4,and the phosphate removals by different oxidant-FeSO4 processes are compared.The results indicate that the removal of phosphate has different efficiency by different oxidant-FeSO4 processes （including H2O2-FeSO4,NaC1O-FeSO4,KMnO4-FeSO4,O3-FeSO4,and O2-FeSO4）,while they all decrease with the increase of the pH and increase with the increase of the amount of iron salt.In addition,the removal of phosphate by adsorption is significantly lower than that by coagulation and sedimentation,because the removal of phosphate by oxidant-FeSO4 process is due to the complex role of the co-precipitation and adsorption.This study proves that oxidant-FeSO4 is feasible,and KMnO4-FeSO4 process will be a promising technology with broad application.