Heavy metal remediation using chelator-enhanced washing of municipal solid waste compost based on spectroscopic characterization

Khare, Srishti; Singhal, Anupam; Rai, Saumitra; Srinivas, R.

doi:10.1007/s11356-023-26970-x

Cited by 6 publications

(5 citation statements)

References 81 publications

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“…Despite its advantages, presence of toxic heavy metals in MSW compost as a result of household hazardous waste being deposited in municipal landfills limits its value 10 , 11 . This can be confirmed by referring to the microstructural characterization section in our previous study 12 . Heavy metals are extremely toxic even in small amounts, remaining persistent and posing a major risk to both the environment and human health in agricultural soil environments 13 , 14 .…”

Section: Introductionsupporting

confidence: 76%

“…The aminopolycarboxylate chelator ethylenediaminetetraacetic acid (EDTA) is widely used for its strong ability to bind various heavy metals. In our previous study 12 , we demonstrated EDTA's excellent efficiency in extracting Cd, Cu Pb, Ni, and Zn from contaminated MSW compost. However, EDTA's poor biodegradability and long-lasting presence in the environment could lead to secondary contamination and ecological worries 32 .…”

Section: Introductionmentioning

confidence: 87%

“…:(0123456789) www.nature.com/scientificreports/ municipal solid waste before being transferred to municipal solid waste compost through composting processes as they are inorganic and non-biodegradable 42 . More extensive findings for metal levels from microstructural examination are outlined in our earlier publication by Khare et al 12 . The MSW compost has a particle size of ' < 4 mm' , leading to increased permeability, which may enhance the leaching of heavy metals and therefore potentially deteriorate the risk of groundwater contamination.…”

Section: Physiochemical Properties Of Original Msw Compostmentioning

confidence: 95%

“…It is vital to comprehend these differences through sequential extractions for accelerating the contaminated MSW compost 21 . Most studies on MSW compost have primarily concentrated on the overall concentrations of heavy metals as treating the contaminated MSW compost presents significant challenges 12 . There is a growing need for innovative and economical approaches to facilitate the faster and more effective decontamination of contaminated MSW compost.…”

Section: Introductionmentioning

confidence: 99%

“…The comparison of these remediation technologies, operational mechanisms, advantages, and limitations are mentioned in Table 1 . Among these approaches, chemical-assisted leaching has gained prominence for its straightforward operation, quick results, and ability to permanently remove heavy metals from contaminated soils, sludge, and compost in recent years 12 , 16 , 23 . The efficiency of leaching in eliminating metal pollutants relies on the selection of a suitable chemical agent or extractant.…”

Section: Introductionmentioning

confidence: 99%

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Bio-chelate assisted leaching for enhanced heavy metal remediation in municipal solid waste compost

Khare,

Singhal,

Rallapalli

et al. 2024

Sci Rep

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Municipal solid waste compost, the circular economy's closed-loop product often contains excessive amounts of toxic heavy metals, leading to market rejection and disposal as waste material. To address this issue, the study develops a novel approach based on: (i) utilizing plant-based biodegradable chelating agent, l-glutamic acid, N,N-diacetic acid (GLDA) to remediate heavy metals from contaminated MSW compost, (ii) comparative assessment of GLDA removal efficiency at optimal conditions with conventional nonbiodegradable chelator EDTA, and (iii) enhanced pre- and post-leaching to evaluate the mobility, toxicity, and bioavailability of heavy metals. The impact of treatment variables, such as GLDA concentration, pH, and retention time, on the removal of heavy metals was investigated. The process was optimized using response surface methodology to achieve the highest removal effectiveness. The findings indicated that under optimal conditions (GLDA concentration of 150 mM, pH of 2.9, retention time for 120 min), the maximum removal efficiencies were as follows: Cd-90.32%, Cu-81.96%, Pb-91.62%, and Zn-80.34%. This process followed a pseudo-second-order kinetic equation. Following GLDA-assisted leaching, the geochemical fractions were studied and the distribution highlighted Cd, Cu, and Pb's potential remobilization in exchangeable fractions, while Zn displayed integration with the compost matrix. GLDA-assisted leaching and subsequent fractions illustrated transformation and stability. Therefore, this process could be a sustainable alternative for industrial applications (agricultural fertilizers and bioenergy) and social benefits (waste reduction, urban landscaping, and carbon sequestration) as it has controlled environmental footprints. Hence, the proposed remediation strategy, chemically assisted leaching, could be a practical option for extracting heavy metals from MSW compost, thereby boosting circular economy.

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Section: Introductionsupporting

confidence: 76%

Section: Introductionmentioning

confidence: 87%

Section: Physiochemical Properties Of Original Msw Compostmentioning

confidence: 95%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Bio-chelate assisted leaching for enhanced heavy metal remediation in municipal solid waste compost

Khare,

Singhal,

Rallapalli

et al. 2024

Sci Rep

Self Cite

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Compositional and structural characterization of bioenergy digestate and its aerobic derivatives compost and vermicompost

Loffredo,

Vona,

Porfido

et al. 2024

J of Sust Agri & Env

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IntroductionIn addition to produce biogas, the anaerobic digestion process releases a significant quantity of solid digestate (DG), a C‐rich byproduct suitable both as a soil improver and as a biosorbent of organic and inorganic pollutants. This study considered a mixed biowaste DG and two aerobic DG‐derivatives such as compost (CP) and vermicompost (VC).Materials and MethodsA multianalytical approach was adopted to comprehensively characterize DG, CP and VC. Elemental composition was determined by total reflection X‐ray fluorescence (TXRF) spectroscopy; micromorphological features, surface elements and surface area were evaluated by scanning electron microscopy coupled with energy dispersive X‐ray (SEM‐EDX) technique and Brunauer–Emmett–Teller (BET) analysis; functional properties were investigated by attenuated total reflectance‐Fourier transform infrared (FTIR‐ATR) spectroscopy and Raman spectroscopy.ResultsTXRF analysis showed that DG had the highest K content (~8.9 g kg−1), while VC had the maximum P, S and Ca contents, and appreciable levels of essential plant micronutrients, such as Mn, Fe, Cu and Zn. SEM‐EDX technique evidenced heterogeneous surfaces and low porosity of all materials. BET analysis showed relevant specific surface areas of DG, CP and, especially, VC (~1.6 m2 g−1). FTIR‐ATR and Raman spectroscopy allowed to identify various aliphatic and aromatic functional groups of the materials and provided information on their major molecular classes, such as lignocellulosic moieties and inorganic components. The latter techniques also contributed to understand the chemical transformations of the DG after the aerobic treatments.ConclusionThe overall results obtained confirmed the valuable potential of these materials in improving the physical and chemical fertility of the soil and in retaining pollutants, with consequent benefits for mantaining soil productivity and preserving ecosystem health.

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Characterization and source apportionment of microplastics in Indian composts

Surendran,

Varghese,

Zafiu

2023

Environ Monit Assess

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Heavy metal remediation using chelator-enhanced washing of municipal solid waste compost based on spectroscopic characterization

Cited by 6 publications

References 81 publications

Bio-chelate assisted leaching for enhanced heavy metal remediation in municipal solid waste compost

Bio-chelate assisted leaching for enhanced heavy metal remediation in municipal solid waste compost

Compositional and structural characterization of bioenergy digestate and its aerobic derivatives compost and vermicompost

Characterization and source apportionment of microplastics in Indian composts

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