摘要
研究了不同铁铝硅摩尔比条件下新型混凝剂对氟的去除效果,并考察熟化时间对混凝剂除氟性能的影响。结果表明,新型混凝剂在(Al+Fe)/Si(mol/mol)=5且Al/Fe(mol/mol)=1时除氟效果最好,60 min后氟离子(F~-)浓度降至5. 3 mg/L,除氟率达81. 1%。但是,聚硅酸中单独引入铁盐或铝盐时除氟效果较差。新型混凝剂放置15 d对除氟效果影响不大。该新型混凝剂在废水除氟方面具有应用潜力。
The fluoride removal by a new coagulant with different Fe/Al/Si molar ratios was investigated and the effect of aging time on fluoride removal was also studied. The results indicated that the highest efficiency of fluoride removal was obtained with( Al + Fe)/Si( mol/mol) of 5 and Al/Fe( mol/mol) of 1,and the concentration of fluorine ion( F~-) declined to 5. 3 mg/L after 60 min reaction,which achieved 81. 1% efficiency of F~- removal. However,an insufficient F-removal was obtained when either ferric salt or aluminum salt was added into polysilicate. The aging time of15 d had little influence on fluoride removal. The new coagulant had the potential of application.
引文
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