African Journal of Environmental Science and Technology最新文献_第4页

Perception of native arid nature in urban surroundings by young urban educated dwellers in Jordan 约旦受过教育的年轻城市居民对城市环境中原生干旱自然的感知

African Journal of Environmental Science and Technology Pub Date : 2023-01-31 DOI: 10.5897/ajest2022.3161

Halimeh Abuayyash, J. Breuste, Ramin Sabouri

引用次数: 1

Comparative study of improved treatment of oil produced-water using pure and chemically-impregnated activated carbon of banana peels and Luffa cylindrica 香蕉皮活性炭与化学浸渍丝瓜活性炭改进处理采油水的比较研究

African Journal of Environmental Science and Technology Pub Date : 2022-12-31 DOI: 10.5897/ajest2022.3134

O. Akinsete, Praise Otitochukwu Agbabi, S. Akinsete, A. Ipeaiyeda

{"title":"Comparative study of improved treatment of oil produced-water using pure and chemically-impregnated activated carbon of banana peels and Luffa cylindrica","authors":"O. Akinsete, Praise Otitochukwu Agbabi, S. Akinsete, A. Ipeaiyeda","doi":"10.5897/ajest2022.3134","DOIUrl":"https://doi.org/10.5897/ajest2022.3134","url":null,"abstract":"Produced water (PW) during oil and gas production operations contains various hazardous substances including heavy metals (HM) with adverse impact on the environment. Disposal of PW interferes with environmental sustainability, making PW treatment obligatory prior to discharge into the environment. Among previously available treatments of PW, environmentally sustainable methods using low-pore space bio-adsorbents require further development. This study investigated the efficacy of chemically-modified activated carbon (cMAC) of Luffa cylindrica (LC) and Banana Peel (BP) for the treatment of PW obtained from Niger-Delta oilfield, treated (2, 4, and 6 h) with finely ground (425 μm) carbonized LC and BP impregnated separately with phosphoric-acid and sodium hydroxide. The derived cMAC was characterized by proximate analysis and FTIR spectroscopy. Treated PW was analysed for HM using AAS, Langmuir, and Freundlich isotherms. Obtained values of the surface area for the cMAC from LC were 880 (NaOH), 830 (H 3 PO 4 ) m 2 /g and BP was 810 (NaOH), and 920 (H 3 PO 4 ) m 2 /g. The existence of active functional groups is revealed on the FTIR spectra. Results revealed a substantial drop in HM concentrations (Zn: 30-86%, Cu: 78-88%, Ni: 33-55%, Fe: 17-52%) in PW after treatment with cMAC at varying contact times. All metals (Zn, Cu, Ni) in the treated PW except Fe were below WHO and USEPA guideline limits. Treatment of Niger Delta oilfield PW was effectively improved with acid-modified carbonized L. cylindrica .","PeriodicalId":7483,"journal":{"name":"African Journal of Environmental Science and Technology","volume":"11 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80033896","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

Biological removal of iron from groundwater in a pilot column on a filter support material with coated jujube seeds 用包覆红枣种子作为过滤支撑材料，生物去除地下水中铁的试验研究

African Journal of Environmental Science and Technology Pub Date : 2022-12-31 DOI: 10.5897/ajest2022.3119

M. Faye, F. Sambe, A. Toure, E. H. Diop, Mouhamed Ndoye, Mariama Diop

{"title":"Biological removal of iron from groundwater in a pilot column on a filter support material with coated jujube seeds","authors":"M. Faye, F. Sambe, A. Toure, E. H. Diop, Mouhamed Ndoye, Mariama Diop","doi":"10.5897/ajest2022.3119","DOIUrl":"https://doi.org/10.5897/ajest2022.3119","url":null,"abstract":"A co-flow pilot filter with a packing support material (coated jujube seeds) was constructed and tested for the biological removal of iron from Senegalese groundwater. Indeed, it is a PVC tube with an internal diameter of 40 mm and a height of 90 cm. The performance of the filter was tested at a constant hydraulic head of 261.67 m 3 /m 2 per day while the iron feed concentrations varied between 0.5-1, 0.5-1.5 and 0.5-2 mg/L, respectively. Coated jujube seeds, covered with a plastic layer and a biofilm containing microorganisms, were used as the filter material. The iron removal was carried out in a single stage, for which a period of two months was required for the maturation of the bed. In optimal working conditions (Q L = 8.11 L/h; pH = 9.5; [Fe 2+ ] 0 = 2 mg/L; P = 1.013 bar and T = 25±1° C; Redox potential = 300 mV), an operating cycle time of 1 day has proven to be sufficient for the filter bed backwash operation. The results show that the biological treatment gives reduction percentages of 39.3, 48.76 and 67.23%, respectively for the boreholes of Pout Kirène (PK2), Pout Sud (PS5) and Koungheul (KK5).","PeriodicalId":7483,"journal":{"name":"African Journal of Environmental Science and Technology","volume":"2 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83095388","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

Determination of effective organic baiting technique for harvesting of termites (Macrotermes Bellicosus) for use as alternative protein for poultry 白蚁(Macrotermes Bellicosus)作为家禽替代蛋白质的有效有机诱捕技术的确定

African Journal of Environmental Science and Technology Pub Date : 2022-11-30 DOI: 10.5897/ajest2022.3104

Wilson O. Haira, Dennis O. Ochuodho, B. Onyango

{"title":"Determination of effective organic baiting technique for harvesting of termites (Macrotermes Bellicosus) for use as alternative protein for poultry","authors":"Wilson O. Haira, Dennis O. Ochuodho, B. Onyango","doi":"10.5897/ajest2022.3104","DOIUrl":"https://doi.org/10.5897/ajest2022.3104","url":null,"abstract":"Experiments at Mbaga hills of Siaya County in Kenya were aimed to determine the most effective organic baiting technique for mass harvesting of Macrotermes bellicosus . Around two separate mounds, 5 treatments replicated 3 times, using earthen pot and plastic containers with maize stocks, eucalyptus stems, lantana camara twigs, Napier grass and rice husks, were set up. Termite counts, at 6.00 am and 6.00 pm, and data on temperature and humidity, from a Hobo data logger were collected over the 21 days period. The data were analyzed using Analysis of Variance (ANOVA) at (p=0.05) and Least Significance Difference (LSD) tests. Substrate preference differed significantly ( p < 0.05) with highest being maize (2,919). Mean termite count differed significantly by containers ( p < 0.05) with highest being earthen pots (1787). Termite count at 6.00 am (2,021) differed significantly ( p < 0.05) with at 6.00 pm (1,952). The count further differed significantly by temperature at night (22.1 0 C) and day (30.2±0.13). Finally, count differed by relative humidity ( p < 0.05) at night (91.0±0.10) and day (69.1±0.50). Results on the effect of bait type, container type, humidity and temperature on count of termites may have practical, policy and theoretical implications for sustainable agriculture.","PeriodicalId":7483,"journal":{"name":"African Journal of Environmental Science and Technology","volume":"118 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-11-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81302870","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

An analytical assessment of brick moulding processes and its impact on local ecosystems, biodiversity, environment and human health in a rural Zimbabwean village 对津巴布韦农村一个村庄的制砖工艺及其对当地生态系统、生物多样性、环境和人类健康的影响进行分析评估

African Journal of Environmental Science and Technology Pub Date : 2022-11-30 DOI: 10.5897/ajest2022.3118

V. Chipfakacha

{"title":"An analytical assessment of brick moulding processes and its impact on local ecosystems, biodiversity, environment and human health in a rural Zimbabwean village","authors":"V. Chipfakacha","doi":"10.5897/ajest2022.3118","DOIUrl":"https://doi.org/10.5897/ajest2022.3118","url":null,"abstract":"Climate change, environmental degradation, loss of biodiversity, changes in the ecosystem and disasters play an important role in the development and economic advancement. In Zororo Village, Zimbabwe, environmental degradation, changes in the ecosystem and biodiversity have occurred rapidly during the last few decades. A literature review, key informant interviews, and focus group discussions were the methodologies used for this research. All the participants agreed that environmental changes had occurred during the last few decades, however, they could not connect these to activities such as brick moulding. Brick moulding is a lucrative and economic backbone of many communities in rural Zimbabwe and other Southern African countries. It is a way of value adding to the clay deposits for economic development but the practice is associated with various environmental challenges linked to the various stages in the brick production process. The process impacts on the environment, ecosystem, biodiversity and human health. Vegetation, indigenous trees, edible insects, small animals and wild fruit trees have disappeared from the environment. Children and domestic animals drown in uncovered holes which also become breeding sites for mosquitoes and other vectors. This article discusses community contributions to the negative impacts of environmental degradation, changes in the ecosystems, biodiversity and human health, through the destruction of anthills in the process of brick moulding in rural Zimbabwe.","PeriodicalId":7483,"journal":{"name":"African Journal of Environmental Science and Technology","volume":"49 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-11-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82244729","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

Increasing soil condensation capacity for agricultural purposes 增加农业土壤凝结能力

African Journal of Environmental Science and Technology Pub Date : 2022-11-30 DOI: 10.5897/ajest2021.2985

S. Arvandi, F. Sharifi

引用次数: 0

Essential and potentially toxic trace elements in selected antimalarial plants: A pilot study in Kilembe copper mine catchment, Kasese District, Uganda 选定抗疟植物中的必需和潜在有毒微量元素:乌干达卡塞塞区Kilembe铜矿集水区的一项试点研究

African Journal of Environmental Science and Technology Pub Date : 2022-10-31 DOI: 10.5897/ajest2022.3130

Namara Sarah, R. Abraham, Katuura Esther

{"title":"Essential and potentially toxic trace elements in selected antimalarial plants: A pilot study in Kilembe copper mine catchment, Kasese District, Uganda","authors":"Namara Sarah, R. Abraham, Katuura Esther","doi":"10.5897/ajest2022.3130","DOIUrl":"https://doi.org/10.5897/ajest2022.3130","url":null,"abstract":"Majority of people in rural areas of Uganda and other malaria-endemic parts of the world use medicinal plants to treat the disease. This study documented medicinal plants used to treat malaria around Kilembe copper mines and assessed the presence of essential and potentially toxic elements. Household surveys and key informant interviews were carried out while anti-malarial plants were sampled, prepared and concentrations of Fe, Mn, Zn, Co, Cu and Ni determined by atomic absorption spectrometry. It was established that Vernonia amygdalina (40%), Ocimum suave (35%), Justicia betonica (32%) and Aloe felox (20%) were the most used plants to treat malaria. Leaves were the most commonly used plant part (83%) while decoctions were reported by 51% of respondents. Concentration of trace elements (mg/kg) in the four plant species ranged from 50.4-422 (Mn), 16.7-202 (Fe), and 19.6-198 (Zn) and from 1.6-44.1, 0-7, and 0.1-31.5 for Cu, Co and Ni, respectively. Fe, Cu and Ni exceeded the recommended thresholds in almost all Kilembe mine samples as well as controls while Mn, Zn and Co exceeded thresholds in more than 25% of the samples. Remediation of Kilembe catchment soils as well as public sensitisation on the safety of medicinal plants is recommended.","PeriodicalId":7483,"journal":{"name":"African Journal of Environmental Science and Technology","volume":"110 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-10-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91267846","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 comparison of selected heavy metals in soils mixed with domestic and industrial sludges and assessment of effects of the sludge pollutants on oxidative stress markers of the African kale (Brassica oleracea var acephala) grown using sewage sludge manure 比较了生活污泥和工业污泥混合土壤中选定重金属的含量，并评估了污泥污染物对使用污水污泥粪便种植的非洲羽衣甘蓝(Brassica oleracea var acephala)氧化应激标志物的影响

African Journal of Environmental Science and Technology Pub Date : 2022-10-31 DOI: 10.5897/ajest2022.3127

Basopo Norah, N. Donald, Trish Chitsa Rumbidzai

{"title":"A comparison of selected heavy metals in soils mixed with domestic and industrial sludges and assessment of effects of the sludge pollutants on oxidative stress markers of the African kale (Brassica oleracea var acephala) grown using sewage sludge manure","authors":"Basopo Norah, N. Donald, Trish Chitsa Rumbidzai","doi":"10.5897/ajest2022.3127","DOIUrl":"https://doi.org/10.5897/ajest2022.3127","url":null,"abstract":"Sewage sludge is used as fertiliser and contains nutrients required for plant growth. It also contains contaminants that can leach into crops. The effects of sewage sludge on kale plants were investigated. Mixture ratios of 50:50 and 20:80 for soil and sludge were prepared. The soil-sludge blends were analysed for selected metal residues. Kale seedlings of 10-13 cm were planted on the different soil-sludge combinations. Leaf lengths were measured 21 days post transplanting for four weeks. After sixty days, the leaves were analysed for metal residue levels and antioxidant enzyme activities. The results showed higher metal concentrations in soil blended with industrial sludge than in soil mixed with domestic sludge. The highest growth of plants was observed after 28 days in plants grown on 50% soil-industrial sludge mixtures. Superoxide dismutase and glutathione peroxidase activities were higher in plants grown on soil applied with sewage sludge when compared to enzyme activities in plants grown on sludge-free soil. The high levels of metals and enhanced antioxidant enzyme activity observed were attributed to the contaminants in the sewage sludge. Preassessment of sewage sludge to be used as soil manure is recommended to safeguard the health of plants and, indirectly, humans who consume the crops. were added to 0.5% thiobarbituric acid made in 20% trichloroacetic acid, and the mixtures were heated at 95°C for 30 min. After rapid cooling on ice, the mixtures were centrifuged at 10,000 × g for 10 min. The absorbance of each sample was measured at 532 nm.","PeriodicalId":7483,"journal":{"name":"African Journal of Environmental Science and Technology","volume":"11 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-10-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79187370","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

Impact of dust accumulation and deposits on polycrystalline solar panel: Case of Senegal 粉尘堆积和沉积对多晶太阳能电池板的影响:塞内加尔案例

African Journal of Environmental Science and Technology Pub Date : 2022-09-30 DOI: 10.5897/ajest2022.3112

Bouya Diop Abdoulaye, N. Babacar, Wade Malick, Diakhaby Aboubakary, Thierno Gaye Amadou, Diop Bouya

引用次数: 0

Contaminated land management policy transfer: Drivers and barriers within the Nigerian context 受污染土地管理政策转让:尼日利亚背景下的驱动因素和障碍

African Journal of Environmental Science and Technology Pub Date : 2022-09-30 DOI: 10.5897/ajest2020.2924

K. Sam

{"title":"Contaminated land management policy transfer: Drivers and barriers within the Nigerian context","authors":"K. Sam","doi":"10.5897/ajest2020.2924","DOIUrl":"https://doi.org/10.5897/ajest2020.2924","url":null,"abstract":"Barriers to successful transfer of contaminated land management policy from one country to another include socio-cultural, economic and environmental differences. While weak contaminated land management regimes desire effective legislation and make efforts to transfer policies from established regimes, contextual differences or characteristics between the two countries involved is a key challenge. These differing characteristics include social values, economic strength, governance structure, and technical know-how. An investigation was conducted through workshop and interviews to determine core social values that are impacted due to contaminated land by oil spills in the Niger Delta region of Nigeria. Workshop was undertaken for participants involving community groups (N=35), while interviews involved contaminated land management regulator (N=8), experts in contaminated land management in the Niger Delta (N=6), and operators in the oil exploration industry (N=7). Water quality, soil quality for agriculture, farming and fishing, and health/wellbeing indicated core social values that influence contaminated land management decisions while stakeholders expressed long-term concern about economic losses, clean-up, environmental degradation and public engagement. It is proposed that policymakers should consider unique conditions and country-specific characteristics in the event of policy adaptation for contaminated land management. An alternative approach to improving contaminated land management is recommended that will account for core social values and accommodate varying perceptions of stakeholders.","PeriodicalId":7483,"journal":{"name":"African Journal of Environmental Science and Technology","volume":"187 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72805562","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: 5