Department of Environmental Management and Toxicology, Federal University of Agriculture Abeokuta, Alabata, Ogun State, PMB 2240, Nigeria.
Environ Sci Pollut Res Int. 2019 Nov;26(32):32708-32722. doi: 10.1007/s11356-019-04310-2. Epub 2019 Feb 6.
Indiscriminate disposal and open burning of sawmill and municipal solid wastes constitute hazards to the quality of the immediate environment and human health. This study assessed the levels of pollutants emitted by burning sawmill and municipal wastes, and their potential hazards. Nine selected sawmills and 6 municipal solid-waste dumps in Abeokuta metropolis were investigated. During waste burning, the concentrations of NO, SO, CO, HS, NH and VOC were monitored in replicates at the dumpsites, 10 m, 20 m and the nearest houses using portable samplers (Aeroqual and Multi-RAE). Mean, ANOVA, correlation and regression statistical tools were used to analyse air quality data; air quality index (AQI) was employed to classify the hazard rating of the gaseous pollutants. Nearest neighbour analysis in ArcGIS 10.0 was used to investigate dumpsites location pattern within the city. The concentrations (mg/m) of sampled parameters from source to nearest house (NH) at the dumpsites ranged as follows: < 0.002-0.175 (NO), < 0.002-0.235 (SO), 0.065-0.425 (HS), 13.98-47.40 (CO), 6.74-170.41 (NH) and 31.13-820.03 (VOC) in wet and dry seasons. The mean concentrations of NO, SO and VOC were below permissible limits at most locations while CO values were higher at all dumpsite. Significant variations (p < 0.05) were observed in the concentrations of the monitored parameters except NO values (SMW) in dry season. AQI rated NO and SO concentrations as "good" at all sites while CO emission ranged from unhealthy to hazardous across the dumpsites. In conclusion, the present locations of SMW and MSW dumps in the city degrade environmental quality and are unsafe for human health.
锯木厂和城市固体废物的任意处置和露天焚烧对当地环境质量和人类健康构成危害。本研究评估了燃烧锯木厂和城市废物所排放的污染物水平及其潜在危害。在阿贝奥库塔大都市，调查了 9 家选定的锯木厂和 6 个城市固体废物倾倒场。在废物燃烧过程中，使用便携式采样器（Aeroqual 和 Multi-RAE）在倾倒场、距离 10 米、20 米和最近的房屋处重复监测 NO、SO、CO、HS、NH 和 VOC 的浓度。使用均值、方差分析、相关性和回归统计工具分析空气质量数据；空气质量指数（AQI）用于对气态污染物的危害等级进行分类。ArcGIS 10.0 中的最近邻分析用于调查城市内倾倒场的位置模式。从源头到最近房屋（NH）的采样参数浓度（mg/m）在倾倒场的范围如下：<0.002-0.175（NO），<0.002-0.235（SO），0.065-0.425（HS），13.98-47.40（CO），6.74-170.41（NH）和 31.13-820.03（VOC）在湿季和干季。在大多数地点，NO、SO 和 VOC 的浓度均低于允许限值，而 CO 值在所有倾倒场都较高。除干季的 NO 值（SMW）外，监测参数的浓度均存在显著差异（p<0.05）。AQI 将所有地点的 NO 和 SO 浓度评为“良好”，而 CO 排放则在整个倾倒场范围内从不健康到危险不等。总之，城市中目前的 SMW 和 MSW 倾倒场位置降低了环境质量，对人类健康不安全。
