College of Environmental Resources Management

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Browsing College of Environmental Resources Management by Author "LAWAL, OLAMIDE AFEEZ"

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    ENVIRONMENTAL IMPACTS ASSESSMENT OF THE PROPOSED LANDFILL SITE ALONG SIUN/AJURA ROAD, OGERE REMO, IN IKENNE LOCAL GOVERNMENT AREA OFOGUN STATE, NIGERIA
    (2025-08-23) LAWAL, OLAMIDE AFEEZ
    ABSTRACT Landfills remain a major facility for waste disposal in developing nations due to its cost-effectiveness, yet they pose significant environmental and public health risks. This study assessed the environmental impacts of the proposed landfill site by Ogun State Government at Ogere-Remo community. Seventeen (17) sampling sites including controls were selected for air quality assessment using MultiRae gas meter for Carbon monoxide (CO), Carbon-dioxide (CO2), Nitrogen (IV) oxide (NO2) Sulphur (IV) oxide (SO2), Volatile Organic Compounds (VOCs) and Particulate matter (PM2.5 and PM10). A Portable Automatic Weather System was used to collect meteorological data. Soil samples, surface water, and groundwater were also collected and analysed for physico-chemical parameters such as OC, OM, pH, EC, TDS, NO3, SO42-, and heavy metals such as Cd, Pb, Zn, Cr, and Cu in both water and soil were analysed using an Atomic Absorption Spectroscopy AAS machine. In addition, two hundred and sixty (260) copies of the structured questionnaire were used for the analysis. Data were analysed using descriptive and inferential statistics. The air quality index (AQI) was calculated to classify the hazard rating of the air pollutants. Mean concentrations (µg/m3) of air quality parameters ranged between 67.33 – 162.33 (CO), 879.0.12 – 2293.83 (CO2), 0.00 – 2.76 (SO2), 231.17 – 1586.33 (VOCs), 42.17 – 1128.83 (CH4), 0.23 – 1.30 (H2S), 0.18 – 0.31 (NO2), 20.83 – 134.33µg/m3 (PM2.5), and 45.17 – 275.04µg/m3 (PM10) across the sampling sites. The mean concentrations of PM2.5 and PM10 exceeded the permissible limit except in one location (SP17). The concentrations of CO, CO2, VOC, CH4, SO2, H2S, and NO2 exceeded the allowable limits in all sampling sites. Concentrations of air pollutants varied significantly (p<0.05) across locations. The AQI of atmospheric PM2.5 and PM10 varied from “moderate” to “unhealthy” for the sensitive group. Air Quality Index (AQI) rated CO in the air samples of the study area as “hazardous”. Mean concentrations of heavy metals in soil ranged from 2.151 – 5.322 (Pb); 1.152 – 3.839 (Cu); 2.464 – 8.470 (Zn), 7.151 – 11.147 (Cr), and 1.533 – 305.3 (Cd). The mean concentration in the topsoil and subsoil was significantly (p<0.05) higher than that of the control site. Mean concentrations of heavy metals in soil were within the WHO limits, except for Cd (1.533 to 305.3 mg/kg). Most of the physico-chemical parameters in soil were within the recommended limits except EC values at 2500-5100 µs/cm at PTD31 and PTD41 points. Mean concentrations of heavy metals in leachates and water exceeded the WHO limits in about 90% of the sampling sites. Most of the physico-chemical parameters for both groundwater and surface water were within the recommended limits, except for leachates, which were above the optimal range. The mean values of bacteria ranged from 21.3 to 163.17 cfu/100 ml, while the high value of coliform bacteria exceeded the WHO and NSDWQ water quality standards (1 cfu/100 ml). 90% of the respondents indicated water and air pollution as the significant environmental hazard from the proposed landfill site. The study revealed that people living closer to the proposed landfill site experience health conditions such as asthma, diarrhea, recurring flu, malaria, cough, cholera, and skin irritation than those living farther away. In Conclusion, a sanitary landfill is the best option for the proposed landfill site.