Recovery of metals by various methods

Recovery of metals by various methods

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The global consumption of manganese is rising due to its growing industrial requirement while the natural reserves of manganese are diminishing at an alarming rate. Consequently, recovery of manganese from metal containing wastes has become highly crucial. Bioleaching of metal from wastes using microbes provides an adequate advantage over the tradi...

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There has been alarming depletion of manganese (Mn) reserves owing to the ongoing extensive mining operations for catering the massive industrial demand of this element. Moreover, the mining operations have been leading to the generation of Mn-rich waste, thereby contaminating both terrestrial and aquatic bodies. The current scenario necessitates t...

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... Biological treatment technologies for recovering metals from E-waste can be defined as the process of converting metals from their insoluble form to their soluble counterparts through the intervention of microbial agents viz., bacteria, archaea, fungi, and their mixture followed by purification of the dissolved metal (Cui and Zhang, 2008;Mohanty et al., 2018). The different biological aspects for metal recovery from E-waste have been presented in Fig. 3. ...
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... Arsenate reduction in prokaryotes is carried out by soluble arsenate reductases (ArsC) [65]. Several bacterial strains of Bacillus, Pseudomonas putida and Pedomicrobium reduces manganese-Mn (III and IV) to Mn (II) and further oxidize it to be used as terminal electron acceptor in electron transport chain [66]. ...
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... The separation of textile MFs from other MPs does not necessarily add complexity but, conversely, might bring consistency to the comparison across different investigations [38]. A recent study by Pedrotti et al., 2021, shows that fibers analyzed from Microplastics, especially MFs, contaminate and affect many aquatic organisms or species of birds or mammals that feed on aquatic species since they are often mistaken for food and ingested by prey species, which, in turn, are eaten by predators, allowing MPs to move up the trophic chain [35,36]. ...
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... Manganese is one of the most strategic metals. The metal and its compounds are used extensively in metallurgy, chemistry, batteries, fertilizers, feed additives, particularly in the ferroalloy industry, for 90 percent of consumption (Mohanty et al. 2018a;An et al. 2021). The production of manganese ore in 2020 was 58.8 million tons due to higher steel production (Rozhikhina et al. 2020). ...
... Manganese-containing secondary sources, such as LIBs and electrodes, have attracted researchers' attention due to declining primary manganese sources (Mohanty et al. 2018a). It is essential for the continued sustainability of the spent batteries to provide economic and environmental benefits (Razmjou et al. 2019). ...
... There has been increasing interest in efficient techniques for manganese extraction from secondary sources, such as e-waste (Niu et al. 2016;Mohanty et al. 2018a). However, despite the rapid development of the manganese industry, there is limited information on the secondary manganese resources Bal et al. 2019) and extraction methods. ...
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... This could lead to serious health problems, causing death and some major problems in aquatic organisms like intestinal damage, decrease growth, inflammation, intestinal homeostasis and cause the blockage of the digestive tract (Kelpsiene et al. 2020). In case of human exposure to microplastic results in cancers, birth defects, obesity, sterility, pains, children development issues, weakens the immune system, seen problem in reproductive problems (Kehinde et al. 2020;Kumar and Das 2016;Mishra et al. 2009;Mohanty et al. 2018). A brief description of the generation, transportation, and deposition of different types of microplastics in the aquatic environment is represented in Figure 2. ...
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... Among these sources, the increasing evidence of the presence of MPs in commercially important seafoods (such as fishes, shrimps and mussels) in are reported which indicating a possible risk to human health through biomagnification and become a potential route of exposure to human via diet (Walkinshaw et al., 2020;Devriese et al. 2015;Cauwenberghe and Janssen 2014). In a recent scientific study on the commercially important fish from Western Arabian Gulf, about 58.58% of synthetic textile fibers (most prominently polyethylene and polypropylene) were recovered from the gastrointestinal tracts of the fish (Baalkhuyur et al., 2020;Kumar et al.,2016b;Mohanty et al., 2017Mohanty et al., , 2018. Similarly, in case of mussels, approximately 2.6-5.1 microfibers per 10 g of commercial mussel sample ranging from 200-1500 mm were reported from Belgium stores (De Witte et al., 2014). ...
Chapter
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... Especially in case of bisolubilization by fungal strains, release of organic acids is highly observed which eventually accelerates the process of metal dissolution. However, their prevalence in case of bacterial dissolution of metals is not as recognized (Mohanty et al. 2017(Mohanty et al. , 2018. The dissolution of metals is due to a complex interaction among mineral surfaces, leaching lixiviants, and microbial cells resulting in both the induction of some proteins involved in the process of metal solubilization and the downregulation of some other proteins Das 2015, 2017). ...
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There has been alarming depletion of manganese (Mn) reserves owing to the ongoing extensive mining operations for catering the massive industrial demand of this element. Moreover, the mining operations have been leading to the generation of Mn-rich waste, thereby contaminating both terrestrial and aquatic bodies. The current scenario necessitates the development of alternative processes for bioremediation as well as economic recovery of Mn from mining wastes. The present investigation aims to report the bioleaching of Mn by Lysinibacillus sp. from mining waste residues in the context of mine waste remediation. Results confirmed that the native isolate had a high Mn biosolubilization potential with a solubilizing efficiency of 84% at the end of a 21-day study under optimized conditions of pulp density 2% (< 150-μm particle size), pH 6.5, and temperature 30 °C. Fourier transform infrared spectroscopy (FTIR) studies followed by liquid chromatography mass spectrometry (LC-MS) analysis were used to ascertain the change in microbial protein conformation, configuration, and protein identification. The results revealed the expression of heat shock proteins (HSP) from the family HSP which is predominantly expressed in bacteria during stress conditions. This study represents the application of native bacterial strain in Mn biosolubilization. We foresee the utility of proteomics-based studies to provide a methodological framework to the underlying mechanism of metal solubilization, thereby facilitating the two-tier benefit of recovery of Mn from alternative sources as well as bioremediation of waste having high manganese content.