Heavy metal dissolution mechanisms from electrical industrial sludge

Gunarathne, Viraj; Rajapaksha, Anushka Upamali; Vithanage, Meththika; Adassooriya, Nadeesh M.; Cooray, Asitha T.; Liyanage, S.; Athapattu, B.C.L.; Rajakaruna, Nishanta; Igalavithana, Avanthi Deshani; Hou, Deyi; Alessi, Daniel S.; Ok, Yong Sik

doi:10.1016/j.scitotenv.2019.133922

Cited by 21 publications

(16 citation statements)

References 49 publications

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“…Furthermore, they observed that Ni was associated with Fe-Mn oxide and carbonate fractions (i.e., 46.1% and 41.8%, respectively). A similar study conducted by Gunarathne et al (2019a) indicated the presence of Pb in two major fractions of sludge generated from the battery manufacturing industry-5413.6 mg kg -1 in the Fe-Mn oxide fraction and 2962.4 mg kg -1 in the carbonate fraction. Figure 2 illustrates the association of metals (M) in different fractions of sludge particles based on the classification of Tessier et al (1979).…”

Section: Heavy Metals Contentmentioning

confidence: 58%

“…This procedure consists of five consecutive extractions to separate the heavy metals that are bound to exchangeable, carbonate, Fe-Mn oxide, organic matter, and residual fractions. Gunarathne et al (2019b) successfully employed the aforementioned method to evaluate heavy metals such as Cu, Pb, and Ni that are associated with different fractions of sludge generated from the electrical appliance manufacturing industry. They observed that the majority of Cu was bound to the carbonate and Fe-Mn oxide fractions (i.e., 65.0% and 25.8%, respectively), whereas Pb was primarily associated with residual and organic matter-bound fractions (i.e., 63.7% and 10 32.3%, respectively).…”

Section: Heavy Metals Contentmentioning

confidence: 99%

“…However, most recent studies focus on the bioleaching approach with various types of microbial strains to convert heavy metals from industrial sludges into the solubilized state (Zhang et al, 2020;Wu et al, 2020;Zhou et al, 2019b). Some recent studies have attempted to compare the leaching rates of heavy metals from industrial sludge with several inorganic and organic acids, and reveal the mechanisms of metal dissolution that resulted from different acids (Gunarathne et al, 2019b).…”

Section: Introductionmentioning

confidence: 99%

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Hydrometallurgical processes for heavy metals recovery from industrial sludges

Gunarathne

Rajapaksha

Vithanage

et al. 2020

Critical Reviews in Environmental Science and Technology

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Hydrometallurgical processes for heavy metal recovery from industrial sludgesHydrometallurgical approaches have been successfully employed for metal separation and recovery from various types of waste materials. Therefore, hydrometallurgy is a promising technology for metal recovery and the removal of potentially toxic heavy metals found in industrial sludge.However, a comprehensive review that focuses on the heavy metal recovery from industrial sludge using hydrometallurgical approaches has not been conducted in the recent past. The present review discusses the capacity of hydrometallurgical techniques in recovering heavy metals sourced from different types of industrial sludges, highlighting recent scientific findings. Hydrometallurgical approaches primarily consist of three process stages: metal dissolution, concentration and purification, and metal recovery. The chemical characteristics of industrial sludge, including the type, concentration and speciation of heavy metals, directly impact selection of the best recovery method. Solvent extraction, ion-exchange, and adsorption are the major techniques employed in concentration and purification, whereas electrodeposition and precipitation are the main methods used in metals recovery. Future research should focus on the development of more efficient and environmentally-friendly methods for metal dissolution from industrial sludges contaminated with multiple metals, while increasing selectivity and energy use efficiency in the concentration and purification, and recovery steps.

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Section: Heavy Metals Contentmentioning

confidence: 58%

Section: Heavy Metals Contentmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Hydrometallurgical processes for heavy metals recovery from industrial sludges

Gunarathne

Rajapaksha

Vithanage

et al. 2020

Critical Reviews in Environmental Science and Technology

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“…Li). environmentally friendly and dangerous, but landfills are still the most important method of disposal of industrial sludge (Gunarathne et al 2019). If untreated sludge is buried directly, it may cause serious problems.…”

Section: Introductionmentioning

confidence: 99%

Novel Combination of Bioleaching and Persulfate for the Removal of Heavy Metals from Metallurgical Industry Sludge

Chen¹,

Li²,

Cui³

et al. 2021

Preprint

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The objective of this study was to remove heavy metals from the metallurgical industry sludge by bioleaching alone and bioleaching combined with persulfate (PDS). The results showed that the removal of Cu, Zn, Pb and Mn reached to 70%, 83.8%, 25.2% and 76.9% by bioleaching alone after 18 d, respectively. The experiment of bioleaching combined with PDS was carried out in which the optimal additive dosage of K2S2O8, 8 g/L, was added to bioleaching after 6 d. After 1 h, the removal of 4 heavy metals reached 75.1, 84.3, 36.7 and 81.6%, respectively. Compared with bioleaching alone, although the increase in removal efficiency was not obvious, the treatment cycle was distinctly shortened from 18 d to 6 d + 1 h. Scanning electron microscopy (SEM) results showed that the surface morphology of the sludge was changed significantly by the combined treatment. The content of heavy metals was significantly reduced after bioleaching combined with PDS by energy dispersive X-ray spectroscopy (EDX). The treated sludge mainly existed in a stable form, and the bioavailability was reduced with European Community Bureau of Reference (BCR) morphology analysis. Therefore, this study proved that the combination of bioleaching and PDS was an efficient method to remove heavy metals from metallurgical industry sludge.

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“…However, it requires a typical apparatus and large amount of energy due to the high temperature operation, and further refining the stage to obtain high quality products [4]. Hydrometallurgical processes are alternative methods to recover copper from Cu-bearing sludge by dissolution in a wide range of acid media such as HCl, HClO 4 , HNO 3 , or H 2 SO 4 [6][7][8][9][10][11]. Unfortunately, these processes are not selective, as these strong acids dissolve several metals including the Cu and Fe contained in the sludge.…”

Section: Introductionmentioning

confidence: 99%

Selective Recovery of Copper from Industrial Sludge by Integrated Sulfuric Leaching and Electrodeposition

Trinh

Lee

Kim

et al. 2020

Metals

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The metal-containing sludge generated from the printed circuit boards (PCBs) manufacturing has been recycled as a secondary resource of copper (Cu) rather than being treated as a hazardous solid waste. However, it should consider the complexity of processing and using of oxidizing or precipitation agents to dissolve and separate Cu from other impurities, especially iron (Fe). This study has combined the dissolution and separation step in one stage by integrated acid leaching and electrodeposition to simplify the recovery process, while maintaining the high efficiency of separation. The chemistry of acid leaching and electrodeposition of the metals demonstrated that the metals (Cu and Fe) in the sludge sample were dissolved in the H2SO4 electrolyte, and Cu could be selectively deposited on the cathode based on the different potential conditions to reduce it on the cathode. The important factors affecting the deposition of Cu were investigated, finding the optimal conditions (current density 15 mA/cm2, H2SO4 100 g/L, Cu 20 g/L, at 45 °C, and for 6 h) which could completely recover Cu from the electrolyte in a selective manner. The obtained copper product possessed a high purity of >99% with adequately uniform morphology and an acceptable consumption of energy (1.7 kWh/kg). It is an effective and simple approach to reclaim the value metal copper from the industrial waste in one single stage of integrated extraction and refining.

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Heavy metal dissolution mechanisms from electrical industrial sludge

Cited by 21 publications

References 49 publications

Hydrometallurgical processes for heavy metals recovery from industrial sludges

Hydrometallurgical processes for heavy metals recovery from industrial sludges

Novel Combination of Bioleaching and Persulfate for the Removal of Heavy Metals from Metallurgical Industry Sludge

Selective Recovery of Copper from Industrial Sludge by Integrated Sulfuric Leaching and Electrodeposition

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