Heavy metals in leachate, impacted soils and natural soils of different landfills in Malaysia: An alarming threat

Hussein, Munirah; Yoneda, Kenichi; Mohd-Zaki, Zuhaida; Amir, Amnorzahira; Othman, Norhayani

doi:10.1016/j.chemosphere.2020.128874

Cited by 139 publications

(72 citation statements)

References 71 publications

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“…The concentration of heavy metals found was low, but most probably enough to impact the soils surrounding the landfill. Hussein et al (2021), which quantified even lower concentrations for cadmium and chromium compared with the current study, confirmed an advanced decline of soil quality by leachate contamination. The authors still mentioned that the existence of heavy metals represented a potential threat to the local flora, groundwater, and surface water in the landfill vicinities.…”

Section: Raw Leachate Physicochemical Characterizationsupporting

confidence: 78%

Influence of humic substances on the landfill leachate biodegradability with a focus on temporal seasonality

Moravia

Moreira

Lebron

et al. 2021

Water Science and Technology

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The high resilience to biological treatments from the landfill leachate is generally associated with the presence of humic substances (HS). The brown color characteristic of this effluent is also related to these substances. Landfill leachate with low biodegradability can make biological treatments unfeasible, which can drive up the cost for the treatment of large leachate volumes. In this context, this research aimed to characterize the leachate in different seasonal periods, and verify the influence of HS species on the biodegradability of the effluent to assist in the selection of adequate treatment techniques. The HS quantification was performed using the modified Lowry method and speciation through fractionation according to the molar masses of the HS species. The tropical regions can be the precursor for the rapid stabilization of biodegradable organic matter. The warmer climate contributed to a reduced BOD/COD ratio (0.03) and the predominance of compounds of lower mass (e.g.: fulvic acids). The tests showed an HS concentration of 26.9% of the total COD in the raw leachate in the rainy season, which increased to 37.3% in the dry season. Approximately 70% of HS species refer to fulvic acids, a fraction identified as having the highest biologic treatment resilience.

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Section: Raw Leachate Physicochemical Characterizationsupporting

confidence: 78%

Influence of humic substances on the landfill leachate biodegradability with a focus on temporal seasonality

Moravia

Moreira

Lebron

et al. 2021

Water Science and Technology

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“…Leachate, which is produced by leaching and degradation of municipal solid waste deposited in landfills and contains a variety of pollutants in high concentration [ 5 , 6 , 7 ], is an important potential groundwater pollution source [ 8 , 9 ]. Heavy metals [ 10 , 11 ] and organic pollutants [ 12 , 13 ] in leachate can migrate for long distances in groundwater and accumulate in every link of the food chain, resulting in decreased cell activity, disturbance of human and animal endocrine systems, and even a variety of adverse health effects [ 14 , 15 , 16 , 17 , 18 , 19 , 20 ]. To eliminate or avoid the substantial risk to local groundwater resource user and the natural environment, and achieve effective management of drinking water source safety, it is essential to identify groundwater pollution around landfills and assess the corresponding health risks.…”

Section: Introductionmentioning

confidence: 99%

Identification of Groundwater Pollution Characteristics and Health Risk Assessment of a Landfill in a Low Permeability Area

Wang

Song

et al. 2021

IJERPH

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The shallow weathering fissure groundwater in the red-bed area of Southwest China is usually the only drinking water source for most rural residents. In this study, a typical landfill with surrounding residents drinking unpurified groundwater in red-bed area was selected and water quality detection, groundwater numerical simulation and human health risk assessment were used to identify and assess groundwater pollution in the region. The chemical type evolved from HCO3-SO4-Ca-Mg and HCO3-SO4-Ca to Na-Ca-Cl-HCO3 contaminated by the landfill. Na+ and Cl− were selected as factors for rapid identification of groundwater pollution. Subsequent analyses using these factors showed that the leachate pollution plume boundary was 190 m downstream of the landfill. Analysis of the redox conditions revealed that the area from the landfill to 5 m downstream was the reduction zone, while the area beyond 5 m was the oxidation zone. The migration and attenuation patterns of inorganic salts (such as SO42−) and heavy metals (such as Fe and Mn) in the oxidation and reduction zones differed obviously. Meanwhile, the organic pollutants in the leachate were reduced and decomposed into organic acids, which caused the groundwater 80 m downstream of the landfill to become weakly acidic (pH ranged from 6.51 to 6.83), and promoted re-entry of adsorbed heavy metals (such as Pb) into the groundwater. The groundwater risk assessment based on human health revealed that lead, manganese, chlorobenzene, dichloroethane and chloroform constituted a major health threat to the residents. The rank of non-carcinogenic risk was lead >manganese, and the maximum area of non-carcinogenic risk was 15,485 m2. The total carcinogenic risk caused by organic pollutants was 7.9 × 10−6, and the area of the carcinogenic risk zone was 11,414 m2. Overall, the results of this study provide a scientific basis for management of drinking water and groundwater remediation in the red-bed area with low permeability.

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“…It signifies the presence of concentrated biodegradable organic load that could be utilized by microalgae as a carbon source. Although not measured in this study, leachate at Jeram landfill also contains macronutrients such as Cd, Cr, Zn, and Cu as reported by Syazwani et al (2019) and Hussein et al (2020). These trace elements are essential for stimulating optimum growth of the microalgae.…”

Section: Nutrient Content In Leachatementioning

confidence: 57%

Sustainable Cultivation of Desmodesmus armatus SAG276.4d using Leachate as a Growth Supplement for Simultaneous Biomass Production and CO2 Fixation

Fuad

Khalid

Kamarudin

2021

Int. J. Renew. Energy Dev.

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Microalgae cultivation has been identified to be highly beneficial for the production of valuable biomass. The recent worldwide interest is to cultivate microalgae in wastewater to replace the use of expensive commercial media. Microalgae can utilize nutrients from the wastewater for their biomass growth, which is useful as feedstock in many products. Interestingly, microalgae cultivation is also capable of reducing a greenhouse gas due to absorption of carbon dioxide (CO2) during photosynthesis. This study was conducted to study the growth of microalgae using leachate as a nutrient supplement. The scope of the research involved the cultivation of freshwater microalgae, Desmodesmus armatus, in the synthetics medium with various percentages of leachate under different light exposures. The growth parameters such as the specific growth rate, biomass productivity, and cell division time were used to evaluate the microalgae growth performance. The amount of CO2 absorbed during the cultivation was determined based on the total biomass production. The highest growth rate of 0.423/day was achieved using a 5% leachate medium under 12 h light duration, and the highest carbon fixation of 1.317 g CO2/L/day was calculated using a culture supplemented with 5% leachate with 24 h light period. The high presence of nutrients in the leachate has contributed to the growth of the microalgae; thus, it has great potential as an alternative growth medium to support biomass production and subsequently help to mitigate global warming.

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Heavy metals in leachate, impacted soils and natural soils of different landfills in Malaysia: An alarming threat

Cited by 139 publications

References 71 publications

Influence of humic substances on the landfill leachate biodegradability with a focus on temporal seasonality

Influence of humic substances on the landfill leachate biodegradability with a focus on temporal seasonality

Identification of Groundwater Pollution Characteristics and Health Risk Assessment of a Landfill in a Low Permeability Area

Sustainable Cultivation of Desmodesmus armatus SAG276.4d using Leachate as a Growth Supplement for Simultaneous Biomass Production and CO2 Fixation

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