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Biowaste-based biodegradable flocculants for clean and sustainable tailings management in industrial mining and mineral processing
Journal of Cleaner Production ( IF 11.1 ) Pub Date : 2021-09-27 , DOI: 10.1016/j.jclepro.2021.129195
Yeling Zhu 1 , Michael Chae 1 , Jie Wang 1 , Birendra Adhikari 1 , Paolo Mussone 2 , David C. Bressler 1
Affiliation  

Massive fluid tailings discharged from industrial mining and mineral processing operations pose numerous economic and environmental challenges. To remove water and condense tailings into sediment, we developed a novel bioflocculant from specified risk materials, a particular type of waste biomass from the animal rendering industry. By properly controlling key synthesis conditions, the bioflocculant successfully met industrial requirements for fluid tailings treatment, including enhanced short-term tailings settling and improved ultimate water removal extent. Settling tests using real industrial fluid tailings showed that the synthesized bioflocculant enabled an initial settling rate 4 magnitudes higher than the control case and achieved 93.2% the dewatering efficiency of a commercial flocculant (hydrolyzed polyacrylamide; HPAM). In contrast to HPAM, our bioflocculant can achieve tailings settling without gypsum, a common processing aid that can hinder downstream industrial operations. More importantly, growth tests using two common microorganisms (Saccharomyces cerevisiae and Escherichia coli) suggested that the bioflocculant can be easily degraded, indicating reduced negative environmental impacts after its use. Taken together, this study demonstrates the great potential of implementing a biodegradable bioflocculant from proteinaceous wastes for clean and sustainable management of mining and mineral processing fluid tailings.



中文翻译:

基于生物废物的可生物降解絮凝剂,用于工业采矿和矿物加工中清洁和可持续的尾矿管理

工业采矿和矿物加工作业排放的大量流体尾矿带来了许多经济和环境挑战。为了去除水分并将尾矿凝结成沉积物,我们开发了一种新型生物絮凝剂,该絮凝剂来自特定的危险材料,这是一种来自动物炼油行业的特殊类型的废弃生物质。通过合理控制关键合成条件,该生物絮凝剂成功地满足了流体尾矿处理的工业要求,包括增强短期尾矿沉降和提高最终除水程度。使用实际工业流体尾矿进行的沉降测试表明,合成的生物絮凝剂的初始沉降率比对照情况高 4 个数量级,并且达到了商业絮凝剂(水解聚丙烯酰胺;HPAM)的 93.2% 的脱水效率。与 HPAM 相比,我们的生物絮凝剂可以在没有石膏的情况下实现尾矿沉降,石膏是一种常见的加工助剂,会阻碍下游工业运营。更重要的是,生长测试使用两种常见的微生物(Saccharomyces cerevisiaeEscherichia coli)表明生物絮凝剂很容易降解,表明其使用后对环境的负面影响减少了。总而言之,这项研究证明了从蛋白质废物中使用可生物降解的生物絮凝剂对采矿和矿物加工流体尾矿进行清洁和可持续管理的巨大潜力。

更新日期:2021-09-30
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