| 新生态铁的混凝作用探索 |
| 摘要点击 3685 全文点击 1708 投稿时间：2011-05-16 修订日期：2011-07-30 |
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| 中文关键词 新生态铁 双氧水 成本 老化 UV254 |
| 英文关键词 newly-formed ferric H2O2 cost aging UV254 |
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| 中文摘要 |
| 利用双氧水和亚铁瞬时反应制备新生态铁作为混凝剂,采用杯罐试验确定了最优制备条件老化时间、酸的添加量、n(H2O2)/n(Fe),并且通过对比新生态铁、硫酸铁、聚合硫酸铁分别对浊度、UV254吸光度的去除效果、沉后水Zeta电位来衡量新生态铁的混凝效果并推测其可能的反应机制.结果表明,老化时间对新生态铁的除浊效果影响极小,可忽略不计; 添加酸浓度为[H+]=0.1 mol·L-1时制备出的新生态铁混凝效能最佳; 提高n(H2O2)/n(Fe)可显著增强新生态铁的混凝效果,最为经济有效的摩尔比值为0.55.新生态铁对浊度的去除效果与硫酸铁、聚合硫酸铁相近; 对UV254吸光度有机物的去除率比Fe2(SO4)3高20%~44%; 沉后水Zeta电位随新生态铁投量增加逐渐趋近于0 mV,电中和作用较强.新生态铁是一种具有开发价值的新型混凝剂,老化时间极短,过程简化,原料价格低廉,对浊度、UV254吸光度去除效果较好. |
| 英文摘要 |
| A new coagulant was synthesized by oxidizing FeII with H2O2 instantaneously. Key parameters in the preparation of the coagulant including aging time, acid volume, and n(H2O2)/n(Fe) were investigated through jar tests. The optimized coagulant was then compared with Fe2(SO4)3 and PFS (poly-ferric sulphate) in residual turbidity, UV254, Zeta potential to evaluate its coagulation efficiency and infer the reaction mechanism. Aging time has a little effect on coagulation efficiency. The optimized acid concentration was 0.1 mol·L-1. Coagulation efficiency increased with n(H2O2)/n(Fe). 0.55 is the most economical and efficient molar ratio. The removal efficiency of turbidity of the newly-formed ferric is similar to Fe2(SO4)3 or PFS. The removal efficiency of UV254 by newly-formed ferric is higher than that by Fe2(SO4)3 by 20%-44%. The Zeta potential of supernatant after being treated by newly-formed ferric gradually increased to 0 mV with the increasing coagulant dosage, indicating a strong effect of charge neutralization.The newly-formed ferric is a promising new coagulant with an extremely short aging time, a simple synthesis process, a lower cost than Fe2(SO4)3 or PFS by more than 50%, and a high removal efficiency of UV254 absorbance. |
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