African Journal of Environmental Science and Technology最新文献_第3页

Contamination level of spent engine oil in the rhizosphere of Arachis Hypogea L. 花生根际废机油污染水平的研究。

African Journal of Environmental Science and Technology Pub Date : 2023-05-31 DOI: 10.5897/ajest2023.3189

B. Chinenye, Chinedu Amadi Chibugo, Boniface Ezea Ifeanyi, I. E. Ngele, Clara Ikegbunam, Stella Okeke Chinaza, Obashi Ojua Eugene

引用次数: 0

Community perception of heavy metal pollution and related risks in Lake Victoria Wetlands, Uganda 乌干达维多利亚湖湿地社区对重金属污染及相关风险的认知

African Journal of Environmental Science and Technology Pub Date : 2023-05-31 DOI: 10.5897/ajest2023.3186

Asiyo Ssanyu Grace, Kiwanuka Marvious, Lunkuse Irene, Mbeiza Mutekanga Norah

{"title":"Community perception of heavy metal pollution and related risks in Lake Victoria Wetlands, Uganda","authors":"Asiyo Ssanyu Grace, Kiwanuka Marvious, Lunkuse Irene, Mbeiza Mutekanga Norah","doi":"10.5897/ajest2023.3186","DOIUrl":"https://doi.org/10.5897/ajest2023.3186","url":null,"abstract":"Wetlands contributing a wide range of livelihoods to the riparian communities are progressively challenged with compounding heavy metals pollution. Controlling the negative impacts of the associated toxicants and adherence to policy implementation requires increased awareness among the local communities. This study investigated the socio-economic variables determining community risk perception of heavy metal pollution in the Lake Victoria wetlands associated with different land uses. A cross-sectional survey was conducted focusing on the wetlands’ pollution status, sources and effects of toxicants on human health. Age, education and occupation were significant predictors of the community risk perception of the wetlands’ heavy pollution. Individuals with at least secondary education were more likely to say a wetland was polluted or not. 68 % and 45 % of respondents agreed that industrial and commercial agricultural activities respectively, were the major sources of heavy metal pollution. Less than 25% of respondents identifying related implications of heavy metal contamination on human health was attributed to the low pollution risk awareness among the wetland dwellers. Therefore, there is a need to incorporate environmental pollution risk concepts at the different education levels using proper risk communication strategies to enable local communities to exploit wetlands resources from an informed point of view.   Key words: Community risk perception; heavy metal pollution; Lake Victoria wetlands.&nbsp","PeriodicalId":7483,"journal":{"name":"African Journal of Environmental Science and Technology","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-05-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135434500","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Investigation of parameters influencing gas production and gasification kinetics of Ziguinchor biomass 紫金草生物质产气及气化动力学影响参数的研究

African Journal of Environmental Science and Technology Pub Date : 2023-04-30 DOI: 10.5897/ajest2022.3170

DIEDHIOU Ansoumane, NDIAYE Lat-Grand, BENSAKHRIA Ammar

{"title":"Investigation of parameters influencing gas production and gasification kinetics of Ziguinchor biomass","authors":"DIEDHIOU Ansoumane, NDIAYE Lat-Grand, BENSAKHRIA Ammar","doi":"10.5897/ajest2022.3170","DOIUrl":"https://doi.org/10.5897/ajest2022.3170","url":null,"abstract":"This study presents the gasification of three types of biomass residues (wood, stem and shells) under CO2 and water steam, using the different analyses X-ray fluorescence (XRF). Generally, the experiments are carried out using XRF installations and a fixed bed reactor system. The tests are carried out on wood, stems, and shells, because of their energy contents (Lower heating value LHV), and their high availability in the Ziguinchor region (Senegal). The solid residues obtained after pyrolysis were used to carry out the gasification tests. Thus, several gasification tests were carried out and the results were interpreted using the Arrhenius equation. Two kinetic models (Volume Reaction Model, and Shrinking Core Model) were used to explain the influence of experimental parameters (nature of biomass, reagent type, and temperature) on synthesis gas production. From the experimental results, it is found that the nature of the sample, the reagent, and the variation in temperature have significant effect on the char kinetics conversion. In addition to the differences in the chemical composition of the raw sample, ash and char density, an explanation on the parameters effects, which vary the conversion kinetics during the gasification tests is given. The purpose of this work is to understand the kinetic variations of raw materials in the fixed bed reactor during gasification.   Key words: Biomass residues, gasification, kinetic conversion, ash chemical composition.","PeriodicalId":7483,"journal":{"name":"African Journal of Environmental Science and Technology","volume":"197 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-04-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135757369","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Giant African land snails (Achatina achatina and Archachatina marginata) as bioindicator of heavy metal pollution 巨型非洲蜗牛(Achatina Achatina和Archachatina marginata)作为重金属污染的生物指标

African Journal of Environmental Science and Technology Pub Date : 2023-04-30 DOI: 10.5897/ajest2022.3131

Ayodeji Ajayi Andrew, Odunayo Oyewole Bisola

{"title":"Giant African land snails (Achatina achatina and Archachatina marginata) as bioindicator of heavy metal pollution","authors":"Ayodeji Ajayi Andrew, Odunayo Oyewole Bisola","doi":"10.5897/ajest2022.3131","DOIUrl":"https://doi.org/10.5897/ajest2022.3131","url":null,"abstract":"It is important to always monitor the bioaccumulation potential for heavy metals by organisms especially the edible ones, to assess their potential risk to human health. This study evaluated the bioaccumulation of heavy metals in the shell and soft tissues of snails. Forty snails each were purchased from Ikire and Ore towns. The snails’ shells, feet, digestive tracts and glands were analysed for bioaccumulation of heavy metals using an Atomic Absorption Spectrophotometer. The results showed that the concentration of heavy metals varied with the location and species of the snail. Archachatina marginata from Ore accumulated higher concentrations of heavy metals than A. marginata from Ikire. The concentration of Pb in Achatina achatina and A. marginata from Ikire, and Cd in A. marginata from Ore are slightly above the FAO/WHO permissible limits. Foot bioaccumulated more heavy metals in A. achatina while the digestive gland bioaccumulated more heavy metals in A. marginata. The study concluded that the shell and soft tissues of A. achatina at Ikire and A. marginata at Ikire and Ore bioaccumulated some levels of toxic heavy metals. A. achatina and A. marginata are capable of being used as a sentinel to study the physiological and biochemical imbalances in living organisms arising from the accumulation of heavy metals.   Key words: Bioaccumulation, heavy metal pollution, snails, Achatina achatina, Archachatina marginata.","PeriodicalId":7483,"journal":{"name":"African Journal of Environmental Science and Technology","volume":"64 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-04-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135757371","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Ecosystem modification and land use change in South East Nigeria: Realities and prospects for conservation 尼日利亚东南部生态系统改造和土地利用变化:保护的现实与前景

African Journal of Environmental Science and Technology Pub Date : 2023-03-31 DOI: 10.5897/ajest2023.3181

I. Igu Nwabueze, N. Ayogu Chinero, V. Okolo Ngozi, O. Duluora Joseph, I. Eburu Peter

{"title":"Ecosystem modification and land use change in South East Nigeria: Realities and prospects for conservation","authors":"I. Igu Nwabueze, N. Ayogu Chinero, V. Okolo Ngozi, O. Duluora Joseph, I. Eburu Peter","doi":"10.5897/ajest2023.3181","DOIUrl":"https://doi.org/10.5897/ajest2023.3181","url":null,"abstract":"Ecosystem modification is increasing in scale and presents the need to provide suitable conservation strategies to address dearth in policy guidelines. This work elucidated the dynamics of land use change, prevalent forest use and policy, and conservation strategy. Geometrically rectified satellite imagery data were processed for 40 years; covering three epochs. Questionnaires were distributed across four locations: 50 questionnaires per location. Results of land use change showed that vegetation cover changed from 11666.6 ha to 6067.2 ha; bare surface: 2833.8 to 1831.4 ha; built up: 1084.4 to 6378.1 ha; farmland: 81.1 to 1407.5 ha and water body: 25.5 to 5.9 ha. Built up area had much land use change gains while vegetation cover recorded much loss. Results showed that individual ownership of forest areas dominated the area. As much as 83% are not aware of rules guiding forest use, details are neither known to a vast majority (88%), nor were the people’s interests considered when making such rules (up to 84%). Principal component analysis showed strategies for promoting conservation: Making and enforcing laws ensuring forest loss reduction, regulation of forest resource use and awareness on the implications of overharvesting, establishing small reserves, planting new forests and inclusion of local people in management.   Key words: Biodiversity, forest management, land use change, tropical ecosystem.","PeriodicalId":7483,"journal":{"name":"African Journal of Environmental Science and Technology","volume":"49 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-03-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135951071","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Microbiological quality of stream and borehole water in Lushoto District, Tanzania 坦桑尼亚卢绍托地区溪流和井水的微生物质量

African Journal of Environmental Science and Technology Pub Date : 2023-03-31 DOI: 10.5897/ajest2023.3182

M. CHOVE Lucy, ATHUMANI Hadija

{"title":"Microbiological quality of stream and borehole water in Lushoto District, Tanzania","authors":"M. CHOVE Lucy, ATHUMANI Hadija","doi":"10.5897/ajest2023.3182","DOIUrl":"https://doi.org/10.5897/ajest2023.3182","url":null,"abstract":"A study was conducted to assess the microbiological quality of water in two streams and three boreholes from Sunga and Mbaru wards in Lushoto district, Tanzania. Water samples were collected in duplicate from the streams and boreholes. Three locations were selected along the stream including unpopulated forest areas, highly populated and less populated areas both with agricultural activities. Analysis of data was done by R-Software and means separated by Turkey‘s honest significance test at p<0.05. Significant differences (p<0.05) in Escherichia coli and Salmonella contamination were observed along the three locations of the streams. Although the unpopulated forest areas were not contaminated by either microorganism except for one sample, the rest of the areas were contaminated. Highly populated agricultural areas were found to be contaminated by E. coli and Salmonella, followed by the less populated agricultural areas. Generally, water samples from the streams failed to meet the TZS 789 Standard and WHO 2011 water guidelines, a risk to water borne disease outbreaks. With the exception of E. coli from boreholes in Madukani, all other borehole water samples were within the limits stipulated in both the TZS 789 Standard and WHO 2011 Guidelines. Communities should be warned about the dangers of water contamination especially at the sources. In addition, water should be treated regardless of its source to improve its safety and quality for human consumption.   Key words: Water, Escherichia coli, Salmonella species, safety, quality, contamination, WHO.","PeriodicalId":7483,"journal":{"name":"African Journal of Environmental Science and Technology","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-03-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135950911","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Pollution assessment of light rare earth metals in sediments of the Ogun River 奥根河沉积物中轻稀土金属污染评价

African Journal of Environmental Science and Technology Pub Date : 2023-02-28 DOI: 10.5897/ajest2021.3024

M. A. Diayi, A. M. Gbadebo, T. A. Arowolo, J. A. Awomeso

{"title":"Pollution assessment of light rare earth metals in sediments of the Ogun River","authors":"M. A. Diayi, A. M. Gbadebo, T. A. Arowolo, J. A. Awomeso","doi":"10.5897/ajest2021.3024","DOIUrl":"https://doi.org/10.5897/ajest2021.3024","url":null,"abstract":"This research was aimed at determining the concentrations of light earth metals in sediments of the Ogun River as well as their pollution and contamination status. Sediment samples collected using a graduated hand held sediment grab were stored in polythene bags and transported to the laboratory in an ice chested cooler. At the laboratory, the sediment samples were air dried, pulverized and sieved. Induced Couple Plasma Mass Spectrometry (ICP/MS) was used to determine the concentrations of light rare earth metals in the samples. Results obtained showed that the Cs values obtained which ranged from 21.10 to 121.40 mg kg-1 were higher than the Average Shale Value (ASV) of 5.00 mg kg-1. Similarly, La ranged from 47.60 to 56.20 mg kg-1; a value which exceeded the ASV value of 43.00 mg kg-1. Values obtained were subjected to Geochemical Pollution Intensity (Igeo) and Contamination Factor (CF) analyses where all Cs values were seen to be very strongly contaminated while Igeo values for Cs which ranged from 3.20 to 4.00 showed highly polluted status. Cs is of great concern to sediment quality in areas surveyed. Likewise, light rare earth metals from Arakanga New Scheme (dam area) and Lafenwa (residential area) should be closely monitored to avoid adverse effects on aquatic or human lives due to high values observed.   Key words: Light rare earth metals, sediment, river, concentration, contamination.","PeriodicalId":7483,"journal":{"name":"African Journal of Environmental Science and Technology","volume":"415 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-02-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135827600","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Benthic macroinvertebrates in the biomonitoring of a Nigerian coastal water 尼日利亚沿海水域底栖大型无脊椎动物的生物监测

African Journal of Environmental Science and Technology Pub Date : 2023-02-28 DOI: 10.5897/ajest2021.3034

A. Nkwoji Joseph

{"title":"Benthic macroinvertebrates in the biomonitoring of a Nigerian coastal water","authors":"A. Nkwoji Joseph","doi":"10.5897/ajest2021.3034","DOIUrl":"https://doi.org/10.5897/ajest2021.3034","url":null,"abstract":"Most coastal waters are exposed to high influx of pollutants due to the obvious elevated human activities. In order to adequately evaluate the extent of toxicity of contaminants in the ecosystem, and their synergistic effects, marine ecologists prefer biomonitoring to chemical approach. The benthic macroinvertebrates, due to their sedentary mode of life and residence at the sediment-water microcosm, are regarded as the most veritable tool for biomonitoring. This is because these organisms are impacted by the interstitial forces of the sediment-water interface in the marine ecosystem and also serve as the main channel for the interchange of biomass. This review focuses on the biomonitoring status and prospects of a coastal lagoon with reference to the benthic macroinvertebrates. The levels of biomonitoring activities which are suborganismal, organismal, population, community and ecosystem levels are critically analyzed. However, most of the molecular and biochemical assays, and biomarkers used in biomonitoring studies at the suborganismal and organismal levels of biological development are being outsourced. This poses great challenges to holistic biomonitoring programs in the vast Nigerian coastal ecosystem.   Key words: Biomonitoring, coastal waters, Lagos lagoon, bioindicators, benthic macroinvertebrates.","PeriodicalId":7483,"journal":{"name":"African Journal of Environmental Science and Technology","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-02-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135827599","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

A targeted resource, the giant freshwater prawns Macrobrachium species in the Mangrove Marine Park in D.R. Congo 刚果民主共和国红树林海洋公园的巨型淡水对虾是一种目标资源

African Journal of Environmental Science and Technology Pub Date : 2023-01-31 DOI: 10.5897/ajest2022.3142

Kutshukina Francine Luhusu, Zebe Victorine Mbadu, Baudouin Michel, J. Micha

引用次数: 0

Multifaceted analytical flood risk assessment in major tributaries-river benue basin-Taraba State, Nigeria 主要支流-贝努埃河流域-尼日利亚塔拉巴州的多方面分析洪水风险评估

African Journal of Environmental Science and Technology Pub Date : 2023-01-31 DOI: 10.5897/ajest2022.3149

T. Adelalu, B. E. Bwadi

引用次数: 0