Influence of pH, depth and humic acid on metal and metalloids recovery from municipal solid waste landfills

Lee, Hyeyeon; Coulon, Frédéric; Wagland, Stuart T.

doi:10.1016/j.scitotenv.2021.150332

Cited by 23 publications

(4 citation statements)

References 49 publications

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“…27 HAs are compounds formed by an aromatic and heterocyclic structure, soluble in alkaline medium, have high ion exchange capacity and can be isolated from nonrenewable carbon (C) sources such as peat, coal and leonardite. [28][29][30][31] HAs comprise phenolic, carboxylic acid, enolic, quinone, sugars, and peptides; however, the phenolic and carboxylic groups are more prevalent in HA structures. 29 Owing to their high natural availability and excellent properties, HA has attracted great interest in several areas, such as environment, [30][31][32] biology 33,34 and medicine.…”

Section: Introductionmentioning

confidence: 99%

“…[28][29][30][31] HAs comprise phenolic, carboxylic acid, enolic, quinone, sugars, and peptides; however, the phenolic and carboxylic groups are more prevalent in HA structures. 29 Owing to their high natural availability and excellent properties, HA has attracted great interest in several areas, such as environment, [30][31][32] biology 33,34 and medicine. 35,36 The classical processes to recover humic substances from organic matter involve extracting with solvents, such as formic acid and sodium pyrophosphate.…”

Section: Introductionmentioning

confidence: 99%

“…HS can be categorized into three groups based on their solubility: HAs, fulvic acids (FAs) and humins 27 . HAs are compounds formed by an aromatic and heterocyclic structure, soluble in alkaline medium, have high ion exchange capacity and can be isolated from nonrenewable carbon (C) sources such as peat, coal and leonardite 28‐31 . HAs comprise phenolic, carboxylic acid, enolic, quinone, sugars, and peptides; however, the phenolic and carboxylic groups are more prevalent in HA structures 29 .…”

Section: Introductionmentioning

confidence: 99%

“…HAs comprise phenolic, carboxylic acid, enolic, quinone, sugars, and peptides; however, the phenolic and carboxylic groups are more prevalent in HA structures 29 . Owing to their high natural availability and excellent properties, HA has attracted great interest in several areas, such as environment, 30‐32 biology 33,34 and medicine 35,36 …”

Section: Introductionmentioning

confidence: 99%

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Partition of humic acids using alkaline aqueous two‐phase systems constituted of alcohol and hydroxides

Vieira,

Buarque,

Gomes

et al. 2024

J of Chemical Tech & Biotech

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BACKGROUNDHumic acids (HAs) are macromolecules classified within the group of humic substances that are mainly related to the agricultural and environmental sectors, but they have attracted interest from the medicine, pharmaceutical, and cosmetic industries. However, these latter sectors depend on developing extraction and purification technologies for adequate use. Thus, this paper aims to study the partitioning and recovery of HA using alkaline two‐phase aqueous systems (ATPSs) based on alkali metal‐based hydroxides and alcohols. Initially, the influence of alcohols (methanol, ethanol, 1‐propanol, and 2‐propanol) and hydroxides (NaOH, KOH, and LiOH) in the phase diagrams construction was addressed.RESULTSThe phase formation is correlated to an increase in the hydrophobicity of alcohols and hydroxides, which allows for the enlargement of the biphasic region. In the proposed systems, HA is always partitioned to the hydroxide‐rich phase. Increasing the hydrophobicity of the alcohol favors the migration of HA to the opposite phase, while increasing the hydrophilicity of the hydroxides leads to better partition and recovery values. It was observed that increasing TLL favors the recovery of HA. Furthermore, there was a decrease in alcohol concentration in the hydroxide‐rich phase with an increase in the alkyl chain and TLL, improving the recovery. Finally, the best reached‐recovery value was 98.18 ± 0.41% (KHA = 0.038 ± 0.02) for ATPS formed by 1‐propanol + NaOH with TLL ≈ 55 at 298 K.CONCLUSIONSThe alkaline systems can be a novel route for recovering humic substances from the environment.This article is protected by copyright. All rights reserved.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Partition of humic acids using alkaline aqueous two‐phase systems constituted of alcohol and hydroxides

Vieira,

Buarque,

Gomes

et al. 2024

J of Chemical Tech & Biotech

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Bioleaching metal-bearing wastes and by-products for resource recovery: a review

et al. 2023

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The global transition to a circular economy calls for research and development on technologies facilitating sustainable resource recovery from wastes and by-products. Metal-bearing materials, including electronic wastes, tailings, and metallurgical by-products, are increasingly viewed as valuable resources, with some possessing comparable or superior quality to natural ores. Bioleaching, an eco-friendly and cost-effective alternative to conventional hydrometallurgical and pyrometallurgical methods, uses microorganisms and their metabolites to extract metals from unwanted metal-bearing materials. The performance of bioleaching is influenced by pH, solid concentration, energy source, agitation rate, irrigation rate, aeration rate, and inoculum concentration. Optimizing these parameters improves yields and encourages the wider application of bioleaching. Here, we review the microbial diversity and specific mechanisms of bioleaching for metal recovery. We describe the current operations and approaches of bioleaching at various scales and summarise the influence of a broad range of operational parameters. Finally, we address the primary challenges in scaling up bioleaching applications and propose an optimisation strategy for future bioleaching research.

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The potential environmental risk implications of two typical non-ferrous metal smelting slags: contrasting toxic metal(loid)s leaching behavior and geochemical characteristics

Men

Ye²,

Li³

et al. 2023

J Soils Sediments

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Influence of pH, depth and humic acid on metal and metalloids recovery from municipal solid waste landfills

Cited by 23 publications

References 49 publications

Partition of humic acids using alkaline aqueous two‐phase systems constituted of alcohol and hydroxides

Partition of humic acids using alkaline aqueous two‐phase systems constituted of alcohol and hydroxides

Bioleaching metal-bearing wastes and by-products for resource recovery: a review

The potential environmental risk implications of two typical non-ferrous metal smelting slags: contrasting toxic metal(loid)s leaching behavior and geochemical characteristics

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