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Bioaugmentation of Municipal Waste
Published in Inamuddin, Charles Oluwaseun Adetunji, Mohd Imran Ahamed, Tariq Altalhi, Bioaugmentation Techniques and Applications in Remediation, 2022
Deviany Deviany, Siti Khodijah Chaerun
In general, microorganisms involved in the recovery of Au and other metals from ores and secondary sources such as electronic wastes can be classified into three groups: (i) chemolithoautotrophic bacteria and archaea such as iron- and sulfur-oxidizing bacteria, (ii) cyanogenic heterotrophic bacteria, and (iii) fungi. As mentioned previously, Chromobacterium violaceum is one of the most widely studied cyanogenic bacterial strains for the leaching of gold from ores and electronic wastes. Chi et al. (2011) reported C. violaceum for the leaching of Au and Cu from the used mobile phone PCBs in yeast extract and polypeptone medium supplemented with glycine. With a 15 g/L pulp density of PCB in an alkaline condition (pH 8-11) supplemented with oxygen and 0.004% (v/v) hydrogen peroxide (H2O2), the leaching of Au and Cu reached 11.31% and 24.6%, respectively, with the increase in pH (Chi et al. 2011).
Acidophilic bioleaching: A Review on the Process and Effect of Organic–inorganic Reagents and Materials on its Efficiency
Published in Mineral Processing and Extractive Metallurgy Review, 2019
Mohammad Jafari, Hadi Abdollahi, Sied Ziaedin Shafaei, Mahdi Gharabaghi, Hossein Jafari, Ata Akcil, Sandeep Panda
Microorganisms used for dissolution of sulfide minerals are normally chemolithoautotrophic in nature, i.e., they need inorganic compounds to grow. Usually inorganic nutrients are provided from surrounding environment. One of the most common culture media widely used in laboratories and industries is the 9K media which is a combination of nitrogen, phosphorus, magnesium, and other salts. Culture media influence the pH, ORP, and bacterial counts. For example, in 9K culture media, ORP increases, pH decreases with higher rates than the 0.9K culture media (Manafi et al. 2013). According to the findings, some of the inhibitors such as glucose, cellobiose, galacturonic acid, and citric acid have an inhibiting effect on the bacterial activity and growth (Frattini et al. 2000).