高固液比下废旧锌锰电池生物淋沥的特性及机理

以Acidithiobacillus thiooxidans和Leptospirillum ferriphilum为淋沥菌株探讨高固液比条件下废旧锌锰电池中锌锰浸出的影响因素、特性及淋沥机理。研究了胞外多聚物（EPS）辅助淋沥浸提的影响、不同固液比淋沥体系代谢产物组成及特征的变化；借助扫描电镜（SEM）、透射电镜（TEM）、三维荧光光谱和接触角、表面能等测试手段分析菌株、电极材料的界面行为。结果表明：生物浸提中EPS的辅助吸附和氧化作用提升了40%左右的锌锰浸提效率；淋沥体系代谢EPS总荧光区域积分标准体积（φT，n）与锌锰的溶出呈显著正相关；EPS提高材料的亲水性，促进了材料和淋沥液的润湿接触，而高固液比下EPS的缺失降低了能源底物的利用和对电池材料的接触浸提。

Features and mechanism of bioleaching spent Zn-Mn batteries at high pulp density

By using Acidithiobacillus thiooxidans and Leptospirillum ferriphilum as bioleaching strains, this essay explores the influential factors, features, and mechanism of bioleaching Zn/Mn from spent Zn-Mn batteries at high pulp density. It studies the effect of bioleaching assisted by extracellular polymeric substances (EPS) and the changing of components and features of metabolites under bioleaching systems with different solid-liquid rates, and analyzes the interfacial behavior of bacterial strains and electrode materials by using testing methods such as scanning electron microscopy (SEM), transmission electron microscopy (TEM), excitation-emission matrix spectroscopy, contact angles, surface energy and so on. The results indicate that Zn and Mn leaching rates have been increased by approximately 40% through assisted absorption and oxidation of EPS bioleaching, excitation-emission area volumes (φT,n) for EPS and dissolution of Zn and Mn are significantly and positively correlated, and that EPS could promote the hydrophilia of batteries and the wetting contact of batteries and leachates, while under high solid-liquid rate, lacking of EPS has a negative effect on the effective utilization of energy substrates and contacting and bioleaching of batteries.