Nagar Neha, Garg Himanshi, Sharma Neha, Awe Samuel Ayowole, Gahan Chandra Sekhar
Department of Microbiology, School of Life Sciences, Central University of Rajasthan, NH-8, Bandarsindri, Kishangarh, Ajmer, 305817 Rajasthan India.
Research & Development Department, Automotive Components Floby AB, Aspenäsgatan 2, 521 51 Floby, Sweden.
3 Biotech. 2021 Mar;11(3):143. doi: 10.1007/s13205-021-02686-y. Epub 2021 Feb 25.
Bioleaching is one of the well-known methods of metal recovery with Environmental benefits. This process has been extensively used for combating improper waste management issues along with metal reclamation. The aim of this study is to bioleach spent petroleum refinery catalyst at variant pulp densities (PD) (5, 10 and 15%) using microorganisms in acidic pH (1.5-1.6) and mesophilic temperature (30-35 °C). The study includes leaching yields of metals like nickel, molybdenum, copper and aluminum. The three bioleaching experiments with different pulp densities yielded a maximum of more than 90% nickel, 73% copper, 87% molybdenum and 24% aluminum. The results are validated 5, 10, and 15% pulp density and the result is validated with pH, Redox potential, microbial population, sulphate concentration and ferrous iron, concentration. The time saving due to faster nickel dissolution using iron and sulphur oxidizing microorganisms would be economical for the bioleaching process.
生物浸出是一种具有环境效益的著名金属回收方法。该过程已被广泛用于解决不当的废物管理问题以及金属回收。本研究的目的是在酸性pH值（1.5 - 1.6）和中温温度（30 - 35°C）下，使用微生物在不同矿浆浓度（5%、10%和15%）对废石油精炼催化剂进行生物浸出。该研究包括镍、钼、铜和铝等金属的浸出率。在不同矿浆浓度下进行的三次生物浸出实验，镍的浸出率最高超过90%，铜为73%，钼为87%，铝为24%。结果在5%、10%和15%的矿浆浓度下得到验证，并且通过pH值、氧化还原电位、微生物数量、硫酸盐浓度和亚铁离子浓度进行了验证。由于使用铁和硫氧化微生物能更快地溶解镍，从而节省时间，这对于生物浸出过程来说将是经济的。
