高固液比下废旧锌锰电池生物淋沥的特性及机理

发布时间：2018-01-03 09:57

本文关键词：高固液比下废旧锌锰电池生物淋沥的特性及机理　出处：《环境工程学报》2017年11期 　论文类型：期刊论文

【摘要】：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。
[Abstract]:With Acidithiobacillus thiooxidans and Leptospirillum. Ferriphilum was used as leaching strain to study the influence factors of zinc and manganese leaching in waste Zn / mn batteries under high solid / liquid ratio. The effects of extracellular polymer (EPS) assisted leaching on the composition and characteristics of metabolites in different solid-liquid leaching systems were studied. The strain was analyzed by means of scanning electron microscope (SEM), transmission electron microscope (TEM), three dimensional fluorescence spectrum, contact angle and surface energy. The results showed that the auxiliary adsorption and oxidation of EPS increased the extraction efficiency of zinc and manganese by about 40%. There was a significant positive correlation between the standard volume of total fluorescence region integral of EPS (桅 Tnn) and the dissolution of zinc and manganese in leaching system. EPS increased the hydrophilicity of the material and promoted the wetting contact between the material and leachate, while the absence of EPS at high solid-liquid ratio reduced the utilization of energy substrates and the contact extraction of battery materials.
【作者单位】：延安大学石油工程与环境工程学院;
【基金】：陕西省高水平大学专项资金项目(2013SXTS03) 延安市科技创新团队(2015CHTD-04) 延安大学博士科研启动项目(YDBK2017-03);延安大学引导项目(YDY2017-10) 国家级大学生创新训练计划项目(201610719015)
【分类号】：X705
【正文快照】： 生物淋沥技术是一种绿色、经济的方法,在低品矿石冶金、废催化剂处理等方面得到广泛研究[1-4],并在金属矿产行业实现了商业化运用,显示巨大的应用潜力。最近,废旧电池生物的淋沥也引起了学者的关注,CERRUTI等[5]最先利用Thiobacillus ferrooxidans菌株对废旧镍氢电池进行了生

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