当前位置: X-MOL 学术Hydrometallurgy › 论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
Biochemical treatment of leachates from hydrometallurgical recycling of spent alkaline batteries
Hydrometallurgy ( IF 4.7 ) Pub Date : 2020-01-01 , DOI: 10.1016/j.hydromet.2019.105223
Zhendong Yang , Witold Uhrynowski , Grazyna Jakusz , Jacek Retka , Joanna Karczewska-Golec , Klaudia Debiec-Andrzejewska , Zbigniew Rogulski , Lukasz Drewniak

Abstract Recycling of waste electrical and electronic equipment including spent batteries focuses on maximizing the material recovery efficiency (of metals, polymers, or solvents) and decreasing the negative environmental impact of leachates that remain after the treatment (i.e. the secondary wastes). The major aim of this study was to develop a novel, low-cost biochemical treatment technology for the management of effluents generated during sulfuric acid–based hydrometallurgical recycling of spent alkaline batteries. We explored the use of various chemical reagents (40% NaOH, 20% Na2CO3, and 1% NH3(aq)) and biogenic ammonia produced by urea-degrading bacteria to increase the pH of the effluents (from pH 0.5 to pH 5.0) and prepare them for further treatment by sulfate-reducing bacteria. Comparisons of the pretreatment efficiency and metal and sulfate removal yields, as well as the characterization of the neutralization products (sediments and effluents) showed that the most promising results were obtained when the raw leachates were treated with 40% NaOH (to reach pH 3.5), followed by the addition of biogenic ammonia (to reach pH 5.0). Sulfate-reducing bacteria (SRB) activity led to a further pH increase (up to ~7.3), almost complete (99%) sulfate removal and metal sulfide (ZnS, MnS) precipitation, as up to ~99% of Zn and Mn were removed in SRB cultures to which appropriately diluted pretreated leachates had been added. The presented study indicated that the pretreatment and neutralization of hydrometallurgical effluents based on the use of urea-degrading and sulfate-reducing bacteria could be an attractive alternative to conventional chemical treatment.

中文翻译:

废碱性电池湿法冶金回收渗滤液的生化处理

摘要 废旧电子电气设备包括废电池的回收重点在于最大限度地提高材料回收效率(金属、聚合物或溶剂),并减少处理后残留的渗滤液(即二次废物)对环境的负面影响。本研究的主要目的是开发一种新型、低成本的生化处理技术,用于管理废碱性电池的硫酸湿法冶金回收过程中产生的废水。我们探索了使用各种化学试剂(40% NaOH、20% Na2CO3 和 1% NH3(aq))和尿素降解细菌产生的生物氨来提高流出物的 pH 值(从 pH 0.5 到 pH 5.0)和为硫酸盐还原菌的进一步处理做好准备。预处理效率和金属和硫酸盐去除率的比较,以及中和产物(沉积物和流出物)的特征表明,当用 40% NaOH 处理原浸出液(达到 pH 3.5)时,获得了最有希望的结果,然后添加生物氨(达到 pH 值 5.0)。硫酸盐还原菌 (SRB) 活性导致 pH 值进一步升高(高达 ~7.3),几乎完全(99%)硫酸盐去除和金属硫化物(ZnS、MnS)沉淀,因为高达 ~99% 的 Zn 和 Mn在加入适当稀释的预处理渗滤液的 SRB 培养物中去除。
更新日期:2020-01-01
down
wechat
bug