Ecotoxicological status and risk assessment of heavy metals in municipal solid wastes dumpsite impacted soil in Nigeria

Essien, Joseph P.; Inam, Edu; Ikpe, D. I.; Udofia, Godwin E.; Benson, Nsikak U.

doi:10.1016/j.enmm.2019.100215

Cited by 33 publications

(23 citation statements)

References 28 publications

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“…Since most dyes do not degrade biologically, measures have to be put in place in order to contain and control them to prevent pollution problems [2]. Dyes and other pollutants found in water sources do not only pose a threat to aquatic life but also endanger human health when found in drinking water sources [3,4]. For most people, the water quality is greatly affected by how the water looks, as such color is the first contaminant to be observed in wastewater.…”

Section: Introductionmentioning

confidence: 99%

Synthesis and Characterization of Hydroxyapatite- (HAP-) Clay Composites and Adsorption Studies on Methylene Blue for Water Treatment

Annan

Arkorful

Konadu

et al. 2021

Journal of Chemistry

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Dyes used by the textile, tannery, and food industries tend to pollute water bodies and must be removed to get clean water. Hydroxyapatite (HAP) was synthesized from eggshells using the wet precipitation process. The as-synthesized HAP was characterized using Fourier Transform Infrared (FTIR) and X-ray powder diffraction (XRD). The synthesized HAP was mixed with three different clays: halloysite (HNT), kaolinite (KAO), and bentonite (BENT). The removal efficiency values of methylene blue (MB) from the data showed that HAP-BENT adsorbents had higher values, followed by HAP-HNT and then HAP-KAO adsorbents. The combined masses of 24 mg, 34.5 mg, and 33 mg (representing 20%, 15%, and 10% of HAP-BENT mass) had average adsorption capacity values of 20.7 mg/g, 17.2 mg/g, and 17.9 mg/g, respectively. For each mass percentage, the adsorption capacity values were found to decrease with adsorbent dosage. The HAP-BENT composites had removal efficiency values of 98.4, 91.9%, and 91.9%, respectively. Adsorption data for the HAP-BENT adsorbents were found to be well described by the Langmuir isotherm model and pseudo-second-order kinetic model. The effect of temperature on adsorption capacity was evaluated and thermodynamical modeling was undertaken. The thermodynamical modeling predicts that based on the value of the change in enthalpy and Gibbs free energy the process was exothermic and spontaneous. This work confirms the potential of HAP-clay composites in removing MB from water.

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Section: Introductionmentioning

confidence: 99%

Synthesis and Characterization of Hydroxyapatite- (HAP-) Clay Composites and Adsorption Studies on Methylene Blue for Water Treatment

Annan

Arkorful

Konadu

et al. 2021

Journal of Chemistry

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“…In metropolitan centers, particularly in rapidly expanding municipalities in developing countries, the dilemmas of solid waste management are of significant concern [ 1 ]. In most developing economies, it is a routine trend to dispose of household waste in poorly maintained and unregulated dumpsites, drainages, waterways, street piles, water channels, and concrete sidewalks [ 2 ]. However, in most developed nations, large-scale disposal of municipal solid wastes (MSW) may not pose a big problem due to the availability of waste management facilities.…”

Section: Introductionmentioning

confidence: 99%

“…However, heavy metals are frequently detected in municipal landfill leachates from hazardous waste landfills as well as solid waste dumpsites [ 21 – 24 ]. Toxic chemical compounds such as heavy metals and persistent organic compounds are released into the atmosphere and the environment when municipal solid wastes are burned or dumped in the open [ 2 , 25 – 28 ]. Leachates from municipal landfills have been reported to release toxic metals into the environment, posing serious threats to nearby lands and groundwater, and then to surface water [ 2 ].…”

Section: Introductionmentioning

confidence: 99%

“…Toxic chemical compounds such as heavy metals and persistent organic compounds are released into the atmosphere and the environment when municipal solid wastes are burned or dumped in the open [ 2 , 25 – 28 ]. Leachates from municipal landfills have been reported to release toxic metals into the environment, posing serious threats to nearby lands and groundwater, and then to surface water [ 2 ]. Even though the impact of generated leachate is reduced to a certain degree from the source of its generation, it could still bear deleterious effects to the environment and the public health through accumulated toxicants to the underlying surface and groundwater contamination.…”

Section: Introductionmentioning

confidence: 99%

“…In Nigeria, the waste management system is rudimentary, with virtually no landfills equipped with good bottom liners. Many studies in Africa and the Middle East have documented the occurrence, ecotoxicological, and health risk assessment of heavy metals in soils, sediments, leachate wells, and surface waters impacted by non-sanitary municipal solid wastes landfills [ 2 , 25 , 41 – 45 ]. Thus, non-sanitary landfills could become a repository and point source of multiple types of chemical compounds, which could contaminate soil and groundwater through seepage of toxic leachates.…”

Section: Introductionmentioning

confidence: 99%

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Occurrence and spatial distribution of heavy metals in landfill leachates and impacted freshwater ecosystem: An environmental and human health threat

et al. 2022

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Municipal landfill leachates are a source of toxic heavy metals that have been shown to have a detrimental effect on human health and the environment. This study aimed to assess heavy metal contamination in leachates, surface water, and sediments from non-sanitary landfills in Uyo, Nigeria, and to identify potential health and environmental effects of leachate contamination. Over the wet and dry seasons, surface water and sediment samples were collected from an impacted freshwater ecosystem, and leachates samples from six monitoring wells. Elemental analyses of samples were conducted following standard analytical procedures and methods. The results indicated that leachate, surface water, and sediment samples all had elevated levels of heavy metals, implying a significant impact from landfills. Pollution indices such as the potential ecological risk index (PERI), pollution load index (PLI), degree of contamination (Cd), modified degree of contamination (mCd), enrichment factor (EF), geoaccumulation index (Igeo), and Nemerov pollution index (NPI) were used to assess the ecological impacts of landfill leachates. The following values were derived: PERI (29.09), PLI (1.96E-07), Cd (0.13), mCd (0.16), EF (0.97–1.79E-03), Igeo (0), and NPI (0.74). Pollution indicators suggested that the sediment samples were low to moderately polluted by chemical contaminants from the non-sanitary landfills, and may pose negative risks due to bioaccumulation. Human health risks were also assessed using standard risk models. For adults, children, and kids, the incremental lifetime cancer rate (ILCR) values were within the acceptable range of 1.00E-06–1.00E-04. The lifetime carcinogenicity risks associated with oral ingestion exposure to heavy metals were 9.09E-05, 1.21E-05, and 3.60 E-05 for kids, adults, and children, respectively. The mean cumulative risk values for dermal exposures were 3.24E-07, 1.89E-06, and 1.17E-05 for adults, children, and kids, respectively. These findings emphasized the risks of human and biota exposure to contaminants from landfills.

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Assessment of heavy metal pollution in soils and health risk consequences of human exposure within the vicinity of hot mix asphalt plants in Rivers State, Nigeria

Ilechukwu

Osuji

Okoli

et al. 2021

Environ Monit Assess

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Ecotoxicological status and risk assessment of heavy metals in municipal solid wastes dumpsite impacted soil in Nigeria

Cited by 33 publications

References 28 publications

Synthesis and Characterization of Hydroxyapatite- (HAP-) Clay Composites and Adsorption Studies on Methylene Blue for Water Treatment

Synthesis and Characterization of Hydroxyapatite- (HAP-) Clay Composites and Adsorption Studies on Methylene Blue for Water Treatment

Occurrence and spatial distribution of heavy metals in landfill leachates and impacted freshwater ecosystem: An environmental and human health threat

Assessment of heavy metal pollution in soils and health risk consequences of human exposure within the vicinity of hot mix asphalt plants in Rivers State, Nigeria

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