硅改性聚合氯化铁的制备及其对制革废水的处理

Preparation and Application of Silicon-modified Polyferric Chloride Flocculant in Tanning Wastewater

将水玻璃和氯酸钠按比例配成一定浓度混合液,加入到净化后的盐酸钢铁酸洗废液中,制得硅改性聚合氯化铁(Si-PFC),并将其用于制革综合废水。试验结果表明:当n(Fe):n(Si)=25:1,混合液匀速投加时间大于1.5h,温度低于30℃时,制得的产品性能最佳。应用于制革综合废水中的最佳投加量为300mg/L,最佳pH值适用范围为7～11,SS和CODcr最佳去除率分别为92.7%和72.3%。

Industrial water - glass was mixed with sodium chlorate in a certain proportion, adding to purified steel waste picking liquor. After period of reaction time, silicon - modified ployferric chloride （ Si - PFC） was prepared and applied to the tanning multiple wastewater. The experimental results show that when molar ratio of Fe and Si is 25： 1, uniform feeding time is more than 1.5h and temperature is lower than 30℃, the property of the products is the best. The best removal ratio of SS and CODcr to the tanning multiple wastewater are 92.7% and 82.3% respectively, while the applicability scope of pH is 7 - 11 and the optimum dosage is 300mg/L.