Comparison of bioleaching and electrokinetic remediation processes for removal of heavy metals from wastewater treatment sludge

Xu, Ying; Zhang, Chaosheng; Zhao, Meihua; Rong, Hongwei; Ke-fang, Zhang; Qiuli, Chen

doi:10.1016/j.chemosphere.2016.10.086

Cited by 95 publications

(19 citation statements)

References 63 publications

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“…The effectiveness of heavy metal ions removal using biosurfactants (rhamnolipid, saponin and sophorolipid) resulted in the elimination of 55–74% of heavy metals ions (Tang et al 2018 ). There are also known processes combining electrokinetic treatment and bioleaching (Xu et al 2017 ). Although the method is simple, it can be used under various conditions (in situ and ex situ), is relatively inexpensive and environmentally friendly, but has not yet found an application on a larger than laboratory scale (Ma et al 2020 ).…”

Section: Problem Of Micropollutantsmentioning

confidence: 99%

Agricultural and non-agricultural directions of bio-based sewage sludge valorization by chemical conditioning

Izydorczyk

Mikula

Skrzypczak

et al. 2021

Environ Sci Pollut Res

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This literature review outlines the most important—agricultural and non-agricultural—types of sewage sludge management. The potential of waste sludge protein hydrolysates obtained by chemical sludge conditioning was reported. The discussed areas include acidic and alkaline hydrolysis, lime conditioning, polyelectrolyte dewatering and other supporting techniques such as ultrasounds, microwave or thermal methods. The legislative aspects related to the indication of the development method and admission to various applications based on specified criteria were discussed. Particular attention was devoted to the legally regulated content of toxic elements: cadmium, lead, nickel, mercury, chromium and microelements that may be toxic: copper and zinc. Various methods of extracting valuable proteins from sewage sludge have been proposed: chemical, physical and enzymatic. While developing the process concept, you need to consider extraction efficiency (time, temperature, humidity, pH), drainage efficiency of post-extraction residues and directions of their management. The final process optimization is crucial. Despite the development of assumptions for various technologies, excess sewage sludge remains a big problem for sewage treatment plants. The high costs of enzymatic hydrolysis, thermal hydrolysis and ultrasonic methods and the need for a neutralizing agent in acid solubilization limit the rapid implementation of these processes in industrial practice. Graphical abstract

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Section: Problem Of Micropollutantsmentioning

confidence: 99%

Agricultural and non-agricultural directions of bio-based sewage sludge valorization by chemical conditioning

Izydorczyk

Mikula

Skrzypczak

et al. 2021

Environ Sci Pollut Res

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“…Various methods have been used to treat dredged sediment contaminated with heavy metals [12], which include the electro-osmosis method, the phytoremediation method, the chemical leaching method, and the solidification/stabilization method, etc. [13].…”

Section: Introductionmentioning

confidence: 99%

Effect of Organics on Heavy Metal-Contaminated River Sediment Treated with Electro-Osmosis and Solidification/Stabilization Methods

Pan

Chen

2020

Materials

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This study focuses on the treatment of heavy metal ions and achieving enhancement of river sediment, which is rich in organics. Fulvic acid was used as the main representative of organics in which to study the transfer of Cu2+, Zn2+ ions in the electroosmotic system, in both the absence and presence of organics. In addition, the effects of the experiment parameters (i.e., voltages, displacement, and water content), heavy metal ion content (0.19% and 0.38%, respectively), and the concentration of organics (1.5%, 3%, and 4.5%) acting on migration of ions and physiochemical properties of sediment, before and after electro-osmosis treatment were investigated. Mineral composition of the soil and its microscopic characteristics were analyzed by scanning electron microscopy. The results show that the 4.5% fulvic acid added in the sediment can enhance the migration ability of Cu2+ and Zn2+ ions through complexation, and simultaneously effectively reduce the formation of colloids with the average reductions of Cu2+ ions and Zn2+ ions being 28 and 11 mg/kg, respectively. While the dewatering capacity of the sediment with higher fulvic acid content is weaker, fulvic acid can effectively reduce the corrosion of the electrode during the electro-osmosis process, due to the film formed on the metal surface. Moreover, the fulvic acid in the organics can be combined with the aluminum and calcium produced by the hydration of the cement, delaying the hydration of the cement, while simultaneously decomposing the hydration product and hindering the hardening of the cement, thereby affecting and destroying the formation of the sediment’s structure and its strength.

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“…Accustomed or indigenous microorganisms found at the mining sites are commonly used as the “biocatalysts” to facilitate the leaching processes for the target metal elements. The bioleaching process is both affected by the basic physiochemical characteristics of ores and controlled by leaching conditions, such as pH, redox, and organic distributions . Although, bioleaching methods have been successfully conducted to extract Cu ions from the primary and secondary refractory ores in the dumps or stirred tanks .…”

Section: Introductionmentioning

confidence: 99%

Microbial fuel cells coupled with the bioleaching technique that enhances the recovery of Cu from the secondary mine tailings in the bio‐electrochemical system

Huang

Liu

Zhang

2019

Env Prog and Sustain Energy

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Improper management of dumped tailings not only causes a potential waste of resources but also poses a direct threat to the lives of local residents. A dual‐chamber microbial fuel cell (MFC) combining with the bioleaching technique was used in the study to extract Cu from the secondary mine tailings at a fed‐batch scale. A mixed culture of acidophilic bacteria was enriched and isolated from the acidic drainage in a copper mine. The effects of the pulp densities and initial pH on both the bio‐electronic performances and the recoveries of Cu on bio‐electrochemical platform were comparatively investigated. An appropriate increase in the pulp densities and a suitable decrease in the initial pH facilitated increases in power generations and enhanced the recoveries of Cu from the tailing samples. The maximum power density of 30.54 mW/m2 was achieved in the coupling system with the coulomb efficiency of 4.52%, and the internal resistance of 166.58 Ω being synchronously obtained. Correspondingly, the highest recovery efficiency of Cu of 78.72% was got in the two‐dimensional tests under conditions including the pulp density (w/v) of 20% and the initial pH of 1.8. The electrochemical reduction and the chemical precipitation in MFCs were confirmed as two of main mechanisms in obviously influencing the recovery of Cu. © 2019 American Institute of Chemical Engineers Environ Prog, 38:e13146, 2019

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Comparison of bioleaching and electrokinetic remediation processes for removal of heavy metals from wastewater treatment sludge

Cited by 95 publications

References 63 publications

Agricultural and non-agricultural directions of bio-based sewage sludge valorization by chemical conditioning

Agricultural and non-agricultural directions of bio-based sewage sludge valorization by chemical conditioning

Effect of Organics on Heavy Metal-Contaminated River Sediment Treated with Electro-Osmosis and Solidification/Stabilization Methods

Microbial fuel cells coupled with the bioleaching technique that enhances the recovery of Cu from the secondary mine tailings in the bio‐electrochemical system

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