Mechanism and application of modified bioelectrochemical system anodes made of carbon nanomaterial for the removal of heavy metals from soil

Chemosphere, Journal Year: 2023, Volume and Issue: 345, P. 140431 - 140431

Published: Oct. 15, 2023

Language: Английский

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Assessment of geochemistry and reprocessing capacity of old copper tailings in Province of Benguet, Philippines

Journal of Degraded and Mining Lands Management, Journal Year: 2025, Volume and Issue: 12(2), P. 7049 - 7061

Published: Jan. 1, 2025

With the rising demand for copper driven by technological advancements and depletion of high-grade resources, there is increasing interest in recycling secondary sources to extract reduce mining tailings. This study examined legacy mine tailings from Benguet, Philippines, assess their reprocessing potential, using historical data geochemical analysis. The have a loamy sand texture, with measured porosity 39.2% permeability coefficient 1.0952 x 10-² cm s-1, indicating low medium permeability. Water infiltration rates vary 0.37 4.71 min-1, suggesting heterogeneous particle size distribution. primary components are quartz, biotite, plagioclase feldspars, minor amounts calcite, magnetite, chalcopyrite, pyrite. Copper (0.19%) sulfur (0.11%) ratios indicate present both chalcopyrite smectite minerals. Notably, highest concentration found particles smaller than 63µm, 0.29 wt.% Cu 0.24 g t-1 Au, or 0.434 equivalent, exceeding company's cut-off grade 0.274% CuEq. highlights promising opportunity recycle gold, helping meet these metals modern advancements.

Language: Английский

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Dynamic Adsorption of Mn2+ from Acid Mine Drainage by Highly Active Immobilized Particles with Fe0/Fe2+ Enhanced SRB

Molecules, Journal Year: 2024, Volume and Issue: 29(18), P. 4497 - 4497

Published: Sept. 22, 2024

Bioremediation of acid mine drainage (AMD) was often challenged by poor tolerance sulfate-reducing bacteria (SRB) to heavy metals and low bioactivity. The highly active immobilized particles with Fe

Language: Английский

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Experimental study on the treatment of AMD by SRB immobilized particles containing “active iron” system

PLoS ONE, Journal Year: 2023, Volume and Issue: 18(12), P. e0295616 - e0295616

Published: Dec. 11, 2023

The inhibition and toxicity of high acidity heavy metals on sulfate-reducing bacteria in acid mine drainage (AMD) were targeted. Highly active SRB immobilized particles prepared using SRB, warm sticker wastes (iron powders), corncobs, Maifan stones as the main matrix materials, employing microbial immobilization technology. repair ability reusability highly for AMD explored. results indicate that adaptability to varied under different initial conditions, such pH, Mn 2+ , SO 4 2- . adsorption process follows quasi-second-order kinetic model, suggesting it involves both physical chemical adsorption. maximum capacity is 3.878 mg/g at a concentration 2.0 mg/L pH 6. On other hand, reduction adheres first-order reaction kinetics, indicating primarily driven by dissimilation SRB. rate 94.23% 800 A layered structure with flocculent appearance formed surface particles. structure’s characteristics found be consistent sulfate green rust (Fe II Fe III 2 (OH) 12 ·8H O). chemisorption, ion exchange, reduction, complexation occurring between matrices can enhance alkalinity decrease sulfates. These are expected offer novel insights materials treatment biological technology, well improve our understanding mechanisms behind abiotic enhanced synergistic decontamination.

Language: Английский

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Microbial-mediated metal(loid) immobilization in mulch-covered tailings

Ecotoxicology and Environmental Safety, Journal Year: 2024, Volume and Issue: 284, P. 116881 - 116881

Published: Aug. 15, 2024

Mulch coverage of mining tailings can create anaerobic conditions and consequently establish an anoxic environment that promotes the metabolic processes microorganisms. This has potential to decrease heavy metal mobility bioavailability. While exposed sunlight have been extensively studied, research on effects microbial-mediated geochemical cycling metals in mulch-covered is scarce. study aimed examine mulch coverage-induced alterations structures tailing microbial communities biogeochemical associated with metals. significantly reduced pH exhibited Random forest analysis demonstrated changes As/Cd-contaminated fractions nutrients (total organic carbon total nitrogen) were most crucial predictors diversity ecological clusters tailings. Notably, different from direct metal(loid) immobilization, facilitate immobilization by promoting Fe, S, As reduction. Overall, this contributed a reduction mobilization, which be attributed shifts processes.The provides valuable insights into as remediation strategy underscores importance managing pollution systems.

Language: Английский

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Impact of steel slag, gypsum, and coal gangue on microbial immobilization of metal(loid)s in non-ferrous mine waste dumps

Journal of Hazardous Materials, Journal Year: 2024, Volume and Issue: 480, P. 135750 - 135750

Published: Sept. 4, 2024

Language: Английский

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