| 重金属Pb(Ⅱ)污染原水的应急处理工艺研究 |
| 摘要点击 2183 全文点击 1205 投稿时间：2007-10-27 修订日期：2008-01-19 |
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| 中文关键词 重金属Pb(Ⅱ) 聚合硫酸铁 聚合氯化铝 应急处理 混凝 |
| 英文关键词 heavy metal Pb(Ⅱ) poly ferric sulfate (PFS) poly aluminum chloride (PACl) emergent treatment coagulation |
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| 中文摘要 |
| 采用2种常用混凝剂——聚合硫酸铁(PFS)和聚氯化铝(PACl)，以水中Pb(Ⅱ)浓度突增为背景，研究了混凝剂投加量、目标物初始浓度以及调节pH值和高锰酸钾(KMnO4)预氧化等措施对混凝除Pb(Ⅱ)效果的影响，同时比较了粉末活性炭(PAC)吸附＋混凝和硅藻土吸附＋混凝等工艺对Pb(Ⅱ)的去除效果.结果表明，单独投加混凝剂时，投加PFS对Pb(Ⅱ)的去除效果优于投加PACl. 2种混凝剂的投加量为10 mg/Ｌ时，对Pb(Ⅱ)的去除效果基本达到最好水平，并且Pb(Ⅱ)初始浓度对混凝效果影响最小.在此投加量下调节pH值到9， 2种混凝剂对应Pb(Ⅱ)的去除率都在95%以上.KMnO4预氧化只在以PACl为混凝剂时对除Pb(Ⅱ)起到一定促进作用.以PFS为混凝剂时，投加10 mg/Ｌ的PAC或投加25 mg/Ｌ的硅藻土会取得相同的除Pb(Ⅱ)效果，即水中Pb(Ⅱ)浓度从402 μg/L降至10 μg/L以下；而混凝剂为PACl时，活性炭投加量为20 mg/Ｌ或硅藻土投加量为50 mg/Ｌ时，水中剩余Pb(Ⅱ)的浓度也可以达标；通过硅藻土与KMnO4联用试验发现，高锰酸钾氧化会削弱硅藻土对Pb(Ⅱ)的吸附作用.综合考虑得出，硅藻土吸附＋混凝才是原水应急除Pb(Ⅱ)简单、经济和有效的方法. |
| 英文摘要 |
| Based on two common coagulants-polyferric sulfate (PFS) and polyaluminum chloride (PACl), some measurements and processes in the background of Pb(Ⅱ) concentration sudden increase in water were studied. The removal efficiency of Pb(Ⅱ) was compared between PAC and diatomite absorption with coagulation. The effect of coagulant dosage, initial concentration of Pb(Ⅱ), pH value and KMnO4 preoxidation on coagulation were investigated. The results showed that using PFS was better than PACl for the removal of Pb(Ⅱ). The regulating pH value up to 9 could improve the removal efficiency of Pb(Ⅱ) up to 95% by coagulation under the optimum dosage of coagulant PFS of 10 mg/Ｌ. KMnO4 preoxidation could improve the removal efficacy of Pb(Ⅱ) by coagulation of PACl only. The Pb(Ⅱ) removal efficiency of PAC and diatomite absorption with coagulation were almost equal. Pb(Ⅱ) concentration could be lowered from 402 μg/L to below 10 μg/L under the condition that dosages of PAC or diatomite were 10 mg/Ｌ or 25 mg/Ｌ by using PFS. The same effect could be got under the condition that dosages of PAC or diatomite were 20 mg/Ｌ or 50 mg/Ｌ by using PACl. KMnO4 and diatomite are dosed at the same time would weaken their function each other. Therefore, diatomite adsorption coupled with coagulation is the simplest and most effective method for removing Pb(Ⅱ). |
