嗜酸菌对废旧印刷线路板金属铜的浸出研究  

Research of Bio-leaching Cu from Printed-circuit Board by Acidophilus Strains

作　　者：赵德龙[1,2] 谌书[1] 王中琪[2] 

机构地区：[1]西南科技大学固体废物处理与资源化教育部重点实验室 [2]西南科技大学四川省环境工程自控技术重点实验室,四川绵阳621010

出　　处：《环境科学与技术》2012年第10期166-170,共5页Environmental Science & Technology

基　　金：教育部重点项目(211165);四川省教育厅重点项目(07ZA132);西南科技大学博士基金(07ZX7132)

摘　　要：选用嗜酸性氧化亚铁硫杆菌(Acidithiobacillus ferrooxidans,简称T.f)、氧化硫硫杆菌(Thiobacillus thiooxidans,简称T.t)作为实验菌种研究其对线路板(Printed circuit board)粉金属铜的浸出;试验以单一菌种、混合菌种、无菌培养基及酸性蒸馏水进行浸出实验研究,通过对比不同条件下的浸出效果,得出单一氧化亚铁硫杆菌(T.f)的浸出效果最好,浸出率达到92.1%。通过对浸出过程中pH、ORP及Fe2+、Fe3+变化分析,发现Fe3+的氧化作用在铜的浸出过程中起主导作用,酸浸也有一定的贡献;对浸出后残余的PCB进行XRD及SEM观察分析发现,PCB组成成分中含有大量的酚烃、苯酚及邻、对位取代酚以及少量的长链烷烃及其脂肪烃,此类有机物在浸出过程中均与细菌或其代谢物发生了作用。Two acidophilic strains,i.e,Acidithiobacillus ferrooxidans and Thiobacillus thiooxidans,were used to extract copper from the powder of printed circuit board（PCB）.The experiment was conducted using different single strains and mixed bacteria,compared with others showing,the leaching behavior of single Acidithiobacillus ferrooxidans was the best with leaching rate up to 92.1%.It was found that oxidation of Fe3＋ was essential in bio-leaching of copper,and some organic compounds remained in PCB residues after the bio-leaching treatment,such as phenol hydrocarbons,phenol and osubstituted phenol and a small amount of long-chain alkanes and aliphatic hydrocarbons,with which the bacteria and their metabolites had reacted during the bio-leaching process.

关 键 词：PCB 生物浸出 铜 氧化亚铁硫杆菌 氧化硫硫杆菌 有机物 

分 类 号：X705[环境科学与工程—环境工程]