曝气强度对城市污泥重金属生物沥滤过程的影响研究  

Effect of aeration rate on bioleaching heavy metal from sewage sludge

作　　者：许立巍[1,2] 黄明[1,2] 张学洪[2,3] 林华[2] 王晓明[2] 施家刚[2] 

机构地区：[1]重庆大学城市建设与环境工程学院,重庆400045 [2]桂林理工大学环境科学与工程学院,桂林541004 [3]广西环境工程与保护评价重点实验室,桂林541004

出　　处：《环境工程学报》2009年第11期2052-2056,共5页Chinese Journal of Environmental Engineering

基　　金：国家自然科学基金资助项目(40663002);广西科技攻关与新产品试制项目(桂科攻0719005-2-2A);广西重点实验室基金资助项目(0801Z01)

摘　　要：以氧化亚铁作为底物,氧化亚铁硫杆菌(Thiobacillus.ferrooxidans)为主要沥滤微生物,在底物投配比为10 g/L,温度为25℃,污泥浓度为12.3g/L的条件下,采用5种不同曝气强度对桂林城市污泥中重金属进行生物沥滤试验。结果表明,生物沥滤的经济曝气强度宜控制在每升污泥0.4L/(m in.L),沥滤3 d后,污泥中超标元素Cu、Zn和Cd的去除率分别达到62.53%、67.80%和54.63%,沥滤处理后污泥中残余重金属含量符合污泥农用的国家标准。In this research,sewage sludge taken from Guilin Wastewater Treatment Plant（WWTP） was selected as cultivation medium for the growth of Thiobacillus ferrooxidans.Ferrous sulfate（FeSO4·7H2O） as energy substrate was added into sludge.Bioleaching systems with five different aeration rates were controlled under the same conditions： substrate dosage 10 g/L,temperature 25℃ and concentrations of sewage 12.3 g/L.The experimental results showed that the aeration rate controlled at 0.4 L/（min·L）was suitable.After three days＇ operation,the removal rates of Cu,Zn and Cd in fresh sludge were 62.53%,67.8% and 54.63% respectively.The residual contents of the three metals in treated sludge also accorded with the national criterion for sludge land use.

关 键 词：城市污泥 氧化亚铁硫杆菌 重金属 生物沥滤 

分 类 号：X705[环境科学与工程—环境工程]