Volatile organic compounds (VOCs) in solid waste landfill cover soil: Chemical and isotopic composition vs. degradation processes

Randazzo, Antonio; Asensio-Ramos, María; Melián, Gladys V.; Venturi, Stefanía; Padrón, Eleazar; Hernández, Pedro A.; Pérez, Nemesio M.; Tassi, Franco

doi:10.1016/j.scitotenv.2020.138326

Cited by 47 publications

(36 citation statements)

References 90 publications

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“…Where rainfall in the region of a landfill is abundant, a cover layer should be arranged on the sludge surface following the sludge disposal process [18]. Landfill covering should be conducted after the sludge is processed to control rainwater infiltration with an impervious barrier [19]. Finally, closure management should be conducted for landfills and leachate should be collected until the landfill becomes stable [20].…”

Section: Discussionmentioning

confidence: 99%

Numerical Evaluation and Management Suggestions for Heavy Metal Pollution Risks in a Sludge Landfill: A Case Study from Fuyong Landfill, Shenzhen, China

Sun

Shu

2020

Advances in Civil Engineering

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Despite the extensive attention paid to the transport of heavy metals in sludge landfills, the processes of transporting these pollutants from a landfill to the underground environment are quite complicated and subject to significant uncertainty. In this study, the transport of typical heavy metal pollutants in a sludge landfill through saturated and unsaturated soil zones during rainfall was investigated via numerical modeling. The objectives of the study are to evaluate the heavy metal pollution risk from a sludge landfill under rainfall infiltration conditions and to propose several management suggestions. The results indicate that, during rainfall, heavy metal concentrations at the top of the unsaturated sludge layer decrease rapidly, but they decrease more gradually at the bottom of the layer. The maximum concentration appears in vertical distribution and decreases gradually through the saturated zone. Nickel is the first heavy metal pollutant to break through the low-permeability natural silt barrier. The transport parameters not only influence the simulated time for heavy metal pollutants to break through the silt layer and cause underground environmental pollution but also affect the extent to which the heavy metal pollutants in pore water exceed the guidelines. On the basis of these results, for dredged sludge with heavy metal concentrations significantly exceeding the standard, the concentration of heavy metals in pore water should be reduced before the sludge is landfilled, and a covering layer should be established on the sludge surface to control rainfall infiltration.

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Section: Discussionmentioning

confidence: 99%

Numerical Evaluation and Management Suggestions for Heavy Metal Pollution Risks in a Sludge Landfill: A Case Study from Fuyong Landfill, Shenzhen, China

Sun

Shu

2020

Advances in Civil Engineering

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“…Despite their low concentration in raw biogas (usually 1% by volume), just like hydrogen sulfide, VOCs lead to equipment problems and negative environmental effects such as greenhouse gases, groundwater contaminants, and disagreeable odor, and they can affect human health [9,73]. For example, acids can be formed during halogenated hydrocarbons combustion (in the presence of water) such as hydrofluoric acid (HF) or hydrochloric acid (HCl) which can cause acidification, premature equipment degradation, and corrosion of materials and catalytic surfaces [20,72].…”

Section: Volatile Organic Compoundsmentioning

confidence: 99%

A Critical Overview of the State-of-the-Art Methods for Biogas Purification and Utilization Processes

et al. 2021

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Biogas is one of the most attractive renewable resources due to its ability to convert waste into energy. Biogas is produced during an anaerobic digestion process from different organic waste resources with a combination of mainly CH4 (~50 mol/mol), CO2 (~15 mol/mol), and some trace gasses. The percentage of these trace gases is related to operating conditions and feedstocks. Due to the impurities of the trace gases, raw biogas has to be cleaned before use for many applications. Therefore, the cleaning, upgrading, and utilization of biogas has become an important topic that has been widely studied in recent years. In this review, raw biogas components are investigated in relation to feedstock resources. Then, using recent developments, it describes the cleaning methods that have been used to eliminate unwanted components in biogas. Additionally, the upgrading processes are systematically reviewed according to their technology, recovery range, and state of the art methods in this area, regarding obtaining biomethane from biogas. Furthermore, these upgrading methods have been comprehensively reviewed and compared with each other in terms of electricity consumption and methane losses. This comparison revealed that amine scrubbing is one the most promising methods in terms of methane losses and the energy demand of the system. In the section on biogas utilization, raw biogas and biomethane have been assessed with recently available data from the literature according to their usage areas and methods. It seems that biogas can be used as a biofuel to produce energy via CHP and fuel cells with high efficiency. Moreover, it is able to be utilized in an internal combustion engine which reduces exhaust emissions by using biofuels. Lastly, chemical production such as biomethanol, bioethanol, and higher alcohols are in the development stage for utilization of biogas and are discussed in depth. This review reveals that most biogas utilization approaches are in their early stages. The gaps that require further investigations in the field have been identified and highlighted for future research.

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“…Some studies state that soil can emit VOCs to the atmosphere although they are often 1-2 orders of magnitude lower than those from aboveground vegetation, thus, soil acts as both a source and sink for VOCs (Peñuelas et al, 2014). In soils, VOCs are produced by all living organisms (Leff & Fierer, 2008) such as microbes or worms, and by no living components, including dissolved OM, particulate OM pools (Mc Bride et al, 2020) and land ll wastes (Randazzo et al, 2020).…”

Section: Introductionmentioning

confidence: 99%

Atmospheric emissions of volatile organic compounds from a mine soil treated with sewage sludge and tomato plants (Lycopersicum esculentum L.)

Fernández-Espinosa

Peña

Oliva

2021

Preprint

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A laboratory study was carried out to investigate the emissions of volatile organic compounds (VOCs) from a mining soil amended with sewage sludge and irrigated with wastewater in comparison to the non-amended soil, with or without tomato plants (Lycopersicum esculentum L.). The study detected a total of nine VOCs emitted from the polluted soil: benzene, toluene, ethylbenzene, p-xylene, m-xylene, o-xylene, styrene, benzene-1,2,4-trimethyl and tetrachloroethylene, among which the most abundant were toluene, m-xylene and styrene (82.2, 4.1 and 3% respectively). The results showed that soil amended with sewage sludge reduced the emission of VOCs (styrene in pots without plants and benzene and xylenes in pots with plants). On the other hand, tomato plants contributed to increase significantly the emissions of all VOCs except styrene in both amended and non-amended soils.

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Volatile organic compounds (VOCs) in solid waste landfill cover soil: Chemical and isotopic composition vs. degradation processes

Cited by 47 publications

References 90 publications

Numerical Evaluation and Management Suggestions for Heavy Metal Pollution Risks in a Sludge Landfill: A Case Study from Fuyong Landfill, Shenzhen, China

Numerical Evaluation and Management Suggestions for Heavy Metal Pollution Risks in a Sludge Landfill: A Case Study from Fuyong Landfill, Shenzhen, China

A Critical Overview of the State-of-the-Art Methods for Biogas Purification and Utilization Processes

Atmospheric emissions of volatile organic compounds from a mine soil treated with sewage sludge and tomato plants (Lycopersicum esculentum L.)

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