Evolution properties and dechlorination capacities of particulate organic matter from a landfill

Liu, Sijia; Zheng, Mingxia; Sun, Xiaojie; Xi, Beidou; He, Xiao-Song; Xiao, Xiao

doi:10.1016/j.jhazmat.2020.123313

Cited by 11 publications

(6 citation statements)

References 40 publications

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“…The large difference in the flotation efficiency of the freshly spiked MPs and the landfill MPs is due to the aging of MPs in mineralized refuse. For example, some environmental substrates, such as humic substances, exhibit strong hydrophobicity and stable hydrophobic structures , and tend to combine with MPs through physical adsorption during aging; − they may not be easily removed by H 2 O 2 digestion, thereby preventing the MPs from floating. In addition, H 2 O 2 digestion may not eliminate interference by minerals. − Therefore, the frequently used flotation method may lead to obvious omission of MPs and result in underestimation of MP pollution in landfills.…”

Section: Results and Discussionmentioning

confidence: 99%

Comparison of Detection Methods of Microplastics in Landfill Mineralized Refuse and Selection of Degradation Degree Indexes

Zhang

Peng

et al. 2021

Environ. Sci. Technol.

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A landfill is an important sink of plastic waste and potential sources of microplastics (MPs) when mineralized refuse is reused. However, limitations are still present in quantifying MPs in mineralized refuse and assessing their degradation degree. In this study, laser direct infrared spectroscopy and liquid chromatography-tandem mass spectrometry (LC-MS/MS) were used to identify MPs of mineralized refuse from a landfill. Although 25− 113 items/g MPs were detected in particles subjected to flotation, 37.9−674 μg/g polyethylene terephthalate (PET) and 0.0716− 1.01 μg/g polycarbonate (PC) were detected in the residual solids by LC-MS/MS, indicating a great amount of plastic polymers still presented in the residue. This suggests that the commonly used flotation-counting method will lead to significant underestimation of MP pollution in mineralized refuse, which might be due to the aging and aggregation process caused by the long-term landfill process. The ratio of "bisphenol A/PC" and "plasticizer/MPs" was found to be positively correlated and negatively correlated with the landfill age, respectively. Therefore, in addition to the spectral index such as the carbonyl index, new indexes based on the concentrations of polymers, free monomers, and plasticizers were proposed to characterize the degradation degree of MPs in a landfill.

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Section: Results and Discussionmentioning

confidence: 99%

Comparison of Detection Methods of Microplastics in Landfill Mineralized Refuse and Selection of Degradation Degree Indexes

Zhang

Peng

et al. 2021

Environ. Sci. Technol.

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“…For the biodegradation of polymers, it was found that certain bacterial strains were able to biodegrade plastics in soil [19,[24][25][26][27][28], in contrast to other studies that used bacterial consortia [29][30][31][32], resulting in a significant reduction in these contaminants as well as a reduction in biodegradation time by 90 days [30] and 30 days [31], demonstrating that the symbiotic capacity of bacteria can be a viable option. Finally, there is the bioremediation of organic matter, the most commonly used techniques were the isolation of bacteria [33,34], and some studies specifically investigated the bioremediation capacity of Pseudomonas [35][36][37] and bacterial mixtures [38][39][40][41].…”

Section: Bioremediation Techniquesmentioning

confidence: 99%

“…Most of these studies focus on evaluating the efficiency of bioremediation by bacterial consortia [38][39][40][41]. Some of these studies used pseudomonas [35][36][37] and other studies selected specific bacteria [33,34], which generally resulted in a high degradation capacity of these contaminants.…”

Section: Organic Mattermentioning

confidence: 99%

Global Situation of Bioremediation of Leachate-Contaminated Soils by Treatment with Microorganisms: A Systematic Review

et al. 2023

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This systematic review presents the current state of research in the last five years on contaminants in soils, especially in leachates from solid waste landfills, with emphasis on biological remediation. In this work, the pollutants that can be treated by microorganisms and the results obtained worldwide were studied. All the data obtained were compiled, integrated, and analyzed by soil type, pollutant type, bacterial type, and the countries where these studies were carried out. This review provides reliable data on the contamination of soils worldwide, especially soils contaminated by leachate from municipal landfills. The extent of contamination, treatment objectives, site characteristics, cost, type of microorganisms to be used, and time must be considered when selecting a viable remediation strategy. The results of this study can help develop innovative and applicable methods for evaluating the overall contamination of soil with different contaminants and soil types. These findings can help develop innovative, applicable, and economically feasible methods for the sustainable management of contaminated soils, whether from landfill leachate or other soil types, to reduce or eliminate risk to the environment and human health, and to achieve greater greenery and functionality on the planet.

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“…For the treatment of industrial waste salt, landfill and incineration are the most commonly used methods [23]. Untreated organic wastes were landfilled, which not only causes serious pollution of soil, water, and air but also wastes salt resources [24][25][26][27]. Incineration is considered to be an effective treatment because it can efficiently decompose organic matter at high temperatures [28][29][30][31], so that the NaCl in the industrial waste salt can be recycled.…”

Section: Introductionmentioning

confidence: 99%

Recovery of Valuable Metals and NaCl from Cobalt-Rich Crust and Industrial Waste Salt via Roasting Coupling Technology

Feng

et al. 2021

J. Sustain. Metall.

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Ocean cobalt crust has attracted much attention due to the high economic potential of various metals. A large amount of industrial waste salt is usually filled or deposited without treatment, causing severe environmental pollution and waste of salt resources. In this work, to recover valuable metals (Cu, Co, Ni, and Mn) and NaCl from cobalt-rich crust and industrial waste salt and diminish energy consumption, a roasting coupling technology has been proposed and process and mechanism were investigated. In the reduction roasting process, the organic matter in industrial waste salt was continuously pyrolyzed, producing a large amount of reducing gases such as CO, CH 4 , and H 2 , which could react with the MnO 2 and Fe 2 O 3 in the cobalt-rich crust to destroy its original crystal structure. The results revealed that the reduction process of cobalt-rich crust was gradually completed from the surface layer of particles to the core. The NaCl and Cu, Co, Ni, and Mn in the roasting residues can be recovered by water leaching and acid leaching, respectively. Under the mass ratio of industrial waste salt to ocean cobalt-rich crust of 7:5, the roasting temperature of 973.15 K, and the roasting time of 25 min, the leaching efficiency of Cu, Co, Ni, and Mn reached 96.03%, 97.98%, 98.52%, and 99.74%, respectively, and the 98.49% recovery rate of NaCl could be achieved. The present process may simultaneously realize the extraction of metals from the cobalt-rich crust and the resource utilization of waste salt.The contributing editor for this article was Zhi Sun.

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Evolution properties and dechlorination capacities of particulate organic matter from a landfill

Cited by 11 publications

References 40 publications

Comparison of Detection Methods of Microplastics in Landfill Mineralized Refuse and Selection of Degradation Degree Indexes

Comparison of Detection Methods of Microplastics in Landfill Mineralized Refuse and Selection of Degradation Degree Indexes

Global Situation of Bioremediation of Leachate-Contaminated Soils by Treatment with Microorganisms: A Systematic Review

Recovery of Valuable Metals and NaCl from Cobalt-Rich Crust and Industrial Waste Salt via Roasting Coupling Technology

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