Tween-80对生物淋滤法去除垃圾焚烧飞灰中重金属的影响  

Leaching Heavy Metals from MSWI Fly Ash by Using Acidithiobacillus thiooxidans in the Presence of a Surfactant Agent

作　　者：周顺桂[1] 胡佩[2] 雷发懋[2] 

机构地区：[1]广东省生态环境与土壤研究所广东省农业环境综合治理重点实验室,广东广州510650 [2]四川师范大学化学学院,四川成都610066

出　　处：《环境科学研究》2006年第2期82-85,123,共5页Research of Environmental Sciences

基　　金：中国博士后科学基金资助项目(2004035024);广东省自然科学基金资助项目(5006694)

摘　　要：通过接种氧化硫硫杆菌和序批式培养试验,研究了不同浓度表面活性剂Tween-80对飞灰生物淋滤过程中重金属溶出的影响.Tween-80的作用表现为:低质量浓度促进,高质量浓度抑制,最佳质量浓度约为1.5 g/L.ρ(Tween-80)为1.5 g/L时可显著提高元素硫的生物氧化速率,加速飞灰浆液的酸化,从而提高飞灰中重金属的溶出(去除)率.但是当ρ(Tween-80)超过3.0 g/L时,将对硫杆菌的生长与增殖产生抑制甚至毒害效应,使生物淋滤反应不能顺利进行.结果表明:在常规的飞灰生物淋滤处理中添加1.5 g/L的Tween-80,经过15 d的淋滤,Cd,Zn,Cu与Pb的去除率最高分别达到87.1%,81.8%,72.3%与31.9%;而不加Tween-80的对照组,4种重金属的去除率分别为84.0%,74.4%,67.5%与27.1%.The effect of a suffactant agent （Tween-80） on metal solubilization during the bioleaching of municipal solid waste incineration （MSWI） fly ash was studied in suspension-leaching experiments using Acidithiobacillus thiooxidans. Results showed that the addition of Tween-80 in an adequate amount （1.5 g/L） could enhance sulfur oxidation, fly suspension acidification and metal solubilization, but higher mass concentrations of Tween-80 （ 〉 3.0 g/L） would interfere the normal growth and proliferation of Acidithiobacillus thiooxidans and thus inhibit metal solubilization. Result from batch experiments also demonstrated that supplementing 1.5 g/L Tween-80 led to the following metal removal efficiencies： Cd, 87.1% ; Zn, 81.8% ; Cu, 72.3% and Pb, 31.9% after 15 d of bioleaching. In contrast, only 84.0% of Cd, 74.4% of Zn, 67.5% of Cu and 27.1% of Pb were extracted from the control without Tween-80.

关 键 词：垃圾焚烧飞灰 重金属 生物淋滤 TWEEN-80 

分 类 号：X701[环境科学与工程—环境工程]