Nigerian Journal of Technological Development最新文献_第4页

Removal of heavy metals from domestic wastewater using Beneficiated Kaolin Clay, Silver Oxide and zinc Oxide nanocomposite 高岭土、氧化银和氧化锌纳米复合材料去除生活污水中的重金属

Nigerian Journal of Technological Development Pub Date : 2023-10-15 DOI: 10.4314/njtd.v20i3.1651

F.O. Ogundipe, M. Saidu, A.S. Abdulkareem, A.O Busari

{"title":"Removal of heavy metals from domestic wastewater using Beneficiated Kaolin Clay, Silver Oxide and zinc Oxide nanocomposite","authors":"F.O. Ogundipe, M. Saidu, A.S. Abdulkareem, A.O Busari","doi":"10.4314/njtd.v20i3.1651","DOIUrl":"https://doi.org/10.4314/njtd.v20i3.1651","url":null,"abstract":"This study describes the removal of total iron, cadmium, lead, copper, manganese, arsenic, mercury silver and zinc from domestic wastewater disposed of via sewers, using Beneficiated Kaolin Clay (BKC), BKC/Ag, BKC/ZnO and BKC/Ag/ZnO nanocomposite adsorbents produced by blending Silver Oxide (Ag) and Zinc Oxide (ZnO) nanoparticles with kaolin clay. High Resolution Transmission Electron Microscope (HRTEM) results showed that the produced adsorbents were polycrystalline in nature, while the interplanar spacing and average crystalline sizes are 1.775 – 4.712 nm and 26. 834 – 40.258 nm respectively, according to X-Ray Diffractometer (XRD) analysis. The Dispersive X – Ray Fluorescence (XRF) analysis indicated that SiO2/Al2O3 ratios for BKC/Ag, BKC/ZnO and BKC/Ag/ZnO nanocomposites adsorbents were 1.5170, 1.4818 and 1.5231 respectively. Brunauer – Emmett – Teller (BET) analysis showed that the desorption average pore sizes fell in the mesopore widths of 13.8994 – 16.9233 nm and surface areas of 1.0545 - 14.5126 m2.g-1. The removal efficiencies of the produced adsorbents followed this trend: BKC/Ag/ZnO > BKC/Ag > BKC/ZnO > BKC. These adsorbents were excellent in the removal of total iron, cadmium, lead, copper, manganese, arsenic, mercury silver and zinc pollutants from domestic wastewater, and hence, recommended for large scale production.","PeriodicalId":31273,"journal":{"name":"Nigerian Journal of Technological Development","volume":"21 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135760884","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

Absorbent mixtures optimisation for COD and Ammonia Nitrogen reduction in stabilised leachate 稳定渗滤液中COD和氨氮减少的吸收剂混合物优化

Nigerian Journal of Technological Development Pub Date : 2023-10-15 DOI: 10.4314/njtd.v20i3.1321

M. H. Abubakar, Z. Daud, H. A. Abba

{"title":"Absorbent mixtures optimisation for COD and Ammonia Nitrogen reduction in stabilised leachate","authors":"M. H. Abubakar, Z. Daud, H. A. Abba","doi":"10.4314/njtd.v20i3.1321","DOIUrl":"https://doi.org/10.4314/njtd.v20i3.1321","url":null,"abstract":"This paper describes the optimisation of mixed media for Chemical Oxygen Demand (COD) and Ammonia Nitrogen (NH3-N) removal from stabilised leachate by feldspar (FE), zeolite (ZE), activated carbon (AC), and cockle shells (CS) mixtures using D-optimal mixture design. Linear equations characterised the optimal mixture. The optimum mitigation of COD and NH3-N in landfill leachate was favourable at 12.5 mg/L, 9.72 mg/L, 6 mg/L, and 11.79 mg/L of adsorbent mixed dosage for FE, ZE, AC, and CS, respectively, with the desirability value of 0.886. The predicted R-squared values for NH3-N (0.9839) and COD (0.8972) were in close agreement with the adjusted R-squared values of 0.9940 and 0.9900 for COD and NH3-N, respectively, which validates the obtained regression models. The Lack of Fit F-values of 0.6015 (COD) and 0.4565 (NH3-N) are insignificant, indicating that the models accurately predict the removal. The Fourier transform infrared spectroscopy (FTIR) revealed that the predominant hydroxyl group consisted of –OH at spectra 3306.18 and 3338.74. The study also revealed that the D-optimal mixture design has extremely high application potential as it produces a good mixture design based on the remediation of contaminants from stabilised leachate.","PeriodicalId":31273,"journal":{"name":"Nigerian Journal of Technological Development","volume":"2011 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135760885","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

Capacities and irreversibility of the vapour compression refrigeration system’s components using aluminium oxide (Al2O3) based nanolubricants 使用氧化铝(Al2O3)基纳米润滑剂的蒸汽压缩制冷系统组件的容量和不可逆性

Nigerian Journal of Technological Development Pub Date : 2023-10-15 DOI: 10.4314/njtd.v20i3.1459

M. Ogbonnaya, O. O. Ajayi, M.A. Waheed

{"title":"Capacities and irreversibility of the vapour compression refrigeration system’s components using aluminium oxide (Al2O3) based nanolubricants","authors":"M. Ogbonnaya, O. O. Ajayi, M.A. Waheed","doi":"10.4314/njtd.v20i3.1459","DOIUrl":"https://doi.org/10.4314/njtd.v20i3.1459","url":null,"abstract":"Hydrochlorofluorocarbon and chlorofluorocarbon refrigerants commonly used in vapour compression refrigeration system (VCRS) have been phased out due to their negative impact on the ecosystem. R134a and R600a refrigerants were considered as their replacement, but they possess low thermal properties, thereby affecting the performance of the VCRS. In this study, the effect of varying aluminium oxide (Al2O3) nanoparticle size (10 nm, 20 – 30 nm and 80nm) and volume concentration (1%, 3%, 5% 10% and 20%) on the capacity and exergy efficiency of each component of VCRS for the optimisation of the VCRS performance and reduction of energy consumption was analysed using R134a and R600a refrigerants. The nanolubricant were prepared using the two-step method. The VCRS showed no significant deterioration in the performance of its components as confirmed for over 24 hours when nanorefrigerant was used. The compressor capacity of nanorefrigerant was lower than that of pure refrigerants while the addition of nanoparticle enhanced the refrigeration effect. The exergy efficiency of the vapour compression system improved with the addition of nanoparticles into the system, the exergy destruction caused by friction in the compressor significantly reduced, thereby reducing the energy consumed by the system.","PeriodicalId":31273,"journal":{"name":"Nigerian Journal of Technological Development","volume":"13 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135760886","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 electric field enhancement and effects of discharge severity in an insulated power cable with multiple gaseous cavities 多气腔绝缘电力电缆电场增强及放电强度影响的研究

Nigerian Journal of Technological Development Pub Date : 2023-10-15 DOI: 10.4314/njtd.v20i3.1435

U. Musa, A. A. Mati, A. A. Mas’ud, G. S. Shehu, S. H. Sulaiman, J. M. Rodriguez-Serna

引用次数: 0

Heat transfer enhancement using combined microchannel with vertical rectangular micro fins 垂直矩形微鳍组合微通道强化传热

Nigerian Journal of Technological Development Pub Date : 2023-10-15 DOI: 10.4314/njtd.v20i3.1454

N. Y. Godi

{"title":"Heat transfer enhancement using combined microchannel with vertical rectangular micro fins","authors":"N. Y. Godi","doi":"10.4314/njtd.v20i3.1454","DOIUrl":"https://doi.org/10.4314/njtd.v20i3.1454","url":null,"abstract":"This paper focuses on the numerical optimisation of a combined hybrid microchannel heat sink with rectangular solid fins. The axial length and volume are fixed, and external structure is allowed to vary. The simulation was performed on an elemental unit cell of the microchannel heat sink . The purpose of the optimisation is to discover an optimal geometric arrangement in internal and external configurations that minimises peak temperature in the microchannel heat sink. A high-density uniform heat flux of 250 W/cm2 is assumed to be dissipated on the bottom wall of the unit cell by microelectronics circuit boards devices. Computational fluid dynamic code was used to discretized the fluid domain and solve a set of governing equations. The influence of hydraulic diameter, external structural shape and fluid velocity on peak temperature and global thermal resistance, is discussed. Coolant or water of Reynolds number range 400 to 500 in a forced convection laminar flow is introduced through the inlet of the computational domain to remove the heat at the bottom of the rectangular block microchannel. The results show that when the fluid velocity is increased from 9.8 to 12.3 m/s across the axial length of the micro heat sink, more heat is removed from the bottom of the combined heat sink. The results revealed that the pump power increased by 37.1% in combined microchannels with fins and from by 27.2% in finless micro heat sink. The result of the study is validated with what is documented in open literature for a traditional micro heat sink with circular flow channel and the trends agree.","PeriodicalId":31273,"journal":{"name":"Nigerian Journal of Technological Development","volume":"59 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135760878","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

Leveraging on low-cost devices for wireless data acquisition in remote pipeline networks 利用低成本设备在远程管道网络中进行无线数据采集

Nigerian Journal of Technological Development Pub Date : 2023-10-15 DOI: 10.4314/njtd.v20i3.1587

I. C. Febaide, G. O. Uzedhe

{"title":"Leveraging on low-cost devices for wireless data acquisition in remote pipeline networks","authors":"I. C. Febaide, G. O. Uzedhe","doi":"10.4314/njtd.v20i3.1587","DOIUrl":"https://doi.org/10.4314/njtd.v20i3.1587","url":null,"abstract":"Pipeline infrastructures are the most used means of transporting oil and gas from extraction point to production and sales point. These pipelines are exposed to various attacks either by natural occurrences, indiscriminate human activities around pipelines or direct criminal sabotage, and therefore require constant monitoring. The use of low-cost wireless devices for pipeline data acquisition as it applies to remote and difficult terrain is presented. Different methods and models have been suggested in literature with several existing systems such as SCADA, DCS, and satellite spectral imaging currently in use for pipeline operations. Among the challenges here is the need for lower operational costs, even at reduced response time demand. The Wireless Data Acquisition System (WDAS) presented simulates a pipeline system in a testbed in which a petroleum product is caused to flow and its parameters read, processed as data and wirelessly transmitted, through a wireless sensor network, to a remote device for monitoring. Results indicate a very short response time of about 3.0sec in the simulation at a percentage accuracy of 0.07% over 1km. It also shows that low-cost wireless sensor networking can provide a cost-effective means for pipeline infrastructure management and should be explored.","PeriodicalId":31273,"journal":{"name":"Nigerian Journal of Technological Development","volume":"15 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135760607","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

Performance analysis of a permanent magnet synchronous motor with dual stator windings 双定子绕组永磁同步电机的性能分析

Nigerian Journal of Technological Development Pub Date : 2023-10-15 DOI: 10.4314/njtd.v20i3.1472

O. J. Tola, E. S. Obe, L. U. Anih

引用次数: 0

Maximising efficient water capacity through reservoir configuration with a case study for Malang City of Indonesia 通过水库配置最大化有效水量——以印度尼西亚玛琅市为例

Nigerian Journal of Technological Development Pub Date : 2023-10-15 DOI: 10.4314/njtd.v20i3.1616

G. Samudro, H. Samudro, S. Mangkoedihardjo

{"title":"Maximising efficient water capacity through reservoir configuration with a case study for Malang City of Indonesia","authors":"G. Samudro, H. Samudro, S. Mangkoedihardjo","doi":"10.4314/njtd.v20i3.1616","DOIUrl":"https://doi.org/10.4314/njtd.v20i3.1616","url":null,"abstract":"All forms of water supply systems had unique characteristics of idle capacity. However, achieving a sustainable water supply over the long term could not eliminate idle capacity. This paper discussed methods for providing efficient capacity without compromising long-term water requirements. The objective of efficient capacity was to reduce idle water capacity and water-carrying infrastructure. This study method reviews previous research results with an in-depth case of a piped water supply system in an urban area. The assessment method referred to the pattern of water demand by consumers. Fluctuations in water demand determined the dimensions of all water supply system components. The results of this study showed that water distribution determines the minimum idle capacity, which directs the need for priority areas for efficient capacity and opens reservoir placement options. Under these priority areas, a decentralised reservoir position resulted in an efficient system dimension. The closer the reservoir was to the consumer, the smaller the idle capacity, which was the contribution of the onsite reservoir. The critical implementation was based on the flexibility of the phasing of water supply and infrastructure. The flexibility addressed the use of flow rates for a certain period, diversification of water sources, and system configuration that determines the dimensions of the infrastructure and maximising utilisation.","PeriodicalId":31273,"journal":{"name":"Nigerian Journal of Technological Development","volume":"21 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135760882","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

Time series forecasting of electrical energy consumption using deep learning algorithm 基于深度学习算法的电能消耗时间序列预测

Nigerian Journal of Technological Development Pub Date : 2023-10-15 DOI: 10.4314/njtd.v20i3.1424

E. O. Edoka, V. K. Abanihi, H. E. Amhenrior, E. M. J. Evbogbai, L. O. Bello, V. Oisamoje

{"title":"Time series forecasting of electrical energy consumption using deep learning algorithm","authors":"E. O. Edoka, V. K. Abanihi, H. E. Amhenrior, E. M. J. Evbogbai, L. O. Bello, V. Oisamoje","doi":"10.4314/njtd.v20i3.1424","DOIUrl":"https://doi.org/10.4314/njtd.v20i3.1424","url":null,"abstract":"Energy consumption forecasting is an operation of predicting the future energy consumption of electrical systems using previous or historical data. The Long Short-term Memory (LSTM) Model; a deep learning model was used in this project to analyze the Short-term consumption forecast performance. This was carried out by using an energy consumption dataset obtained from the Transmission Company of Nigeria (TCN) Benin City regional 132/33KV transmission station. The dataset were daily load readings recorded in the half-hourly format from August to December 2021. The model was used to demonstrate the feasibility of generating an accurate short-term load forecast for the case study despite the peculiarity and insufficiency of the energy consumption readings. Mean Absolute Percentage Error (MAPE) and Root Mean Square Error (RMSE) are the statistical evaluation metrics used. The approach produces exceptional levels of accuracy, with MAPE of 0.010 and RMSE of 19.759 for a 100 time-step. The findings imply that the LSTM model can make accurate predictions with minimal error, and this Deep learning model may be a useful tool for short-term forecasting demand. This finding serves as a baseline for future research in this field of study and power system planning.","PeriodicalId":31273,"journal":{"name":"Nigerian Journal of Technological Development","volume":"21 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135760879","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

Physio-mechanical assessment and process mapping of AlSi10mg/Cu material for automobile application 汽车用AlSi10mg/Cu材料的物理力学评价及工艺制图

Nigerian Journal of Technological Development Pub Date : 2023-10-15 DOI: 10.4314/njtd.v20i3.1492

O. Olaniran, A. A. Adediran, A.A. Akinwande, O.S. Adesina, O.A. Mosadomi

{"title":"Physio-mechanical assessment and process mapping of AlSi10mg/Cu material for automobile application","authors":"O. Olaniran, A. A. Adediran, A.A. Akinwande, O.S. Adesina, O.A. Mosadomi","doi":"10.4314/njtd.v20i3.1492","DOIUrl":"https://doi.org/10.4314/njtd.v20i3.1492","url":null,"abstract":"In this study, copper (Cu) particles were used as a replacement for ceramic particles in an AlSi10Mg matrix to lessen the brittleness often associated with ceramic particles when used as fillers in aluminum matrix. AlSi10Mg was combined with 0, 2, 4, and 6% Cu, and microwave sintering was performed at 300, 450, and 600 °C. The composites produced were subjected to physical tests (porosity, density, shrinkage, and relative density), tensile tests (yield and ultimate strength, elastic modulus, and elongation), and microstructure test. Cu particles were observed to be dispersed at 2% and 4% sintering temperatures and clustered at 6% sintering temperatures, according to the microstructural images. The incorporation of 2% and 4% Cu decreased porosity, leading to increased yield, ultimate tensile strength, and elastic modulus respectively. It was noted that 6% Cu addition resulted in strength reduction owing to particle clusters. Sintering temperatures between 300 and 450 ℃ were favorable for all property investigated; nevertheless, temperatures above 600 °C were detrimental to property responses. The proposed process map revealed diverse response values for varying input combination parameters; hence, a Cu dosage of 4% at a sintering temperature of ≤ 450 °C is recommended.","PeriodicalId":31273,"journal":{"name":"Nigerian Journal of Technological Development","volume":"13 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-10-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135760869","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