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Performance of Cold Atmospheric Plasma in Reducing Airborne Particles and Carbon Dioxide Concentrations in Sports Facilities
Namwon Paik,
Younghyo Park,
Namkyung Kim,
Yonghee Kim,
Doyeon Kim,
Hyunyoung Hong
Issue:
Volume 7, Issue 1, March 2023
Pages:
1-4
Received:
21 December 2022
Accepted:
10 January 2023
Published:
17 January 2023
Abstract: According to a few reports recently published, cold atmospheric pressure plasma (CAP) is a state-of-the-art technique in the field of environmental science. Studies reported the performance of CAP in the removal of particulate matter (PM) and microorganisms, including fungi, bacteria, and viruses. The CAP also effectively removed the odor, volatile organic compounds (VOCs), and numerous chemicals, including formaldehyde. However, studies on the control of PM and carbon dioxide (CO2) in sports facilities are limited. This study was conducted in two parts. In Part 1, the levels of indoor PM10, PM2.5, PM1.0, and CO2 were measured in two sports facilities, including a table tennis center and a fitness center, to determine the occupants’ exposure levels to the pollutants. In part 2, the performance of the CAP technique in the reduction of airborne concentrations of PM10 and CO2 was investigated. The PM10 concentrations were significantly higher in the fitness center than in the table tennis center. The concentration ratios of PM10, PM2.5, and PM1.0 to PM10 concentrations were 1.00, 0.95, and 0.81, respectively. The CO2 concentrations were significantly higher in table tennis centers where aerobic exercise was predominant. The performance of CAP on the removal of PM10 and CO2 was highly promising. The average reduction rates against PM10 and CO2 concentrations were 69% and 35%, respectively. Further studies on the performance of CAP against other pollutants, such as total volatile organic compounds and microorganisms in sports facilities are needed.
Abstract: According to a few reports recently published, cold atmospheric pressure plasma (CAP) is a state-of-the-art technique in the field of environmental science. Studies reported the performance of CAP in the removal of particulate matter (PM) and microorganisms, including fungi, bacteria, and viruses. The CAP also effectively removed the odor, volatile...
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Research on PVT Module Operating at High Temperature
Issue:
Volume 7, Issue 1, March 2023
Pages:
17-22
Received:
6 February 2023
Accepted:
14 March 2023
Published:
15 March 2023
Abstract: At present, the research and development of PVT modules by researchers and engineers worldwide is still in the stage of small-scale production and research and development. Most PVT modules use ordinary photovoltaic cells. In order to ensure their best operating efficiency, the output hot water temperature is generally not more than 30°C. To obtain high temperature hot water, secondary heating is required, such as using heat pump, so the overall system cost is high. Based on the above problems, this paper studies and develops a new PV-thermal integrated module, re-optimizes the overall structure, selects the characteristic high-temperature resistant crystalline silicon photovoltaic cell (black silicon) and solar special heat-absorbing coating to improve the operating temperature of the PVT module, and uses graphene heat conductive material to increase the contact area of heat conduction and heat transfer, which is packaged and processed. After a series of experimental tests, the operating temperature of the PVT module reaches 60°C, and it can stably obtain high-quality hot water above 50°C. The PVT module can work under high temperature conditions for a long time, effectively improving the overall energy conversion efficiency of the system, and the generated hot water can directly meet the needs of daily life and space heating without secondary heating, has a good market development prospect.
Abstract: At present, the research and development of PVT modules by researchers and engineers worldwide is still in the stage of small-scale production and research and development. Most PVT modules use ordinary photovoltaic cells. In order to ensure their best operating efficiency, the output hot water temperature is generally not more than 30°C. To obtain...
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Assessment of Physicochemical Parameters of Water from Selected Boreholes Around Nnewi Industrial Area, Anambra State, Nigeria
Nkiruka Charity Eboagu,
Vincent Ishmael Egbulefu Ajiwe,
Chiedozie Chukwuemeka Aralu,
Kate Ekwy Ochiagha,
Ebele Joy Morah
Issue:
Volume 7, Issue 1, March 2023
Pages:
23-33
Received:
20 February 2023
Accepted:
13 March 2023
Published:
11 April 2023
Abstract: The study seeks to evaluate the quality of borehole water around the Nnewi industrial area of Anambra State, Nigeria, and to determine the extent of its deterioration due to waste from nearby industries. Samples were collected from 16 different borehole sampling sites around 8 industries for twelve consecutive months (May 2019 to April 2020) and analysed for various physicochemical parameters such as pH, temperature, biochemical oxygen demand (BOD), chemical oxygen demand (COD), dissolved oxygen (DO), etc., using standard methods. The results were compared with World Health Organisation (WHO) standards. In both seasons, data acquired indicate COD ranges of 4.50 – 20.50 mg/L (mean value 9.63±5.28 mg/L), temperature 27.00 – 30.00°C (mean value 28.59±0.99°C), pH 5.60–7.99 (mean value 6.97±0.47), DO 2.00 – 6.60 mg/L (mean3.99±0.76 mg/L), BOD 4.00 – 9.60 mg/L (mean 6.54±1.33mg/L). All the physicochemical parameters examined, with exception of BOD and COD, are within the WHO standard limits. Pearson’s correlation showed that physicochemical parameters were strongly and moderately correlated with each other at either p < 0.01 or < 0.05. The BOD and COD results revealed that the borehole water was found to be contaminated, unfit for drinking, and likely health hazards to users. It is, therefore, recommended that water from these study areas will be properly treated before human consumption, to rid it of contaminants.
Abstract: The study seeks to evaluate the quality of borehole water around the Nnewi industrial area of Anambra State, Nigeria, and to determine the extent of its deterioration due to waste from nearby industries. Samples were collected from 16 different borehole sampling sites around 8 industries for twelve consecutive months (May 2019 to April 2020) and an...
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