고전적층판 이론을 이용한 카본튜브의 재료특성 해석과 원형 콘크리트 기둥의 압축강도 향상에 관한 연구

이경훈 (사)한국열환경공학회 2022 열환경공학 Vol.17 No.2

Carbon fiber is a material that has a very high tensile strength and is flexible, so it is easy to manufacture into a desired shape. If carbon fiber is processed into a thin carbon sheet and then a circular concrete column is wound, the compressive strength can be improved due to the confined effect. In this study, the characteristics of multi-layered carbon sheets were identified by applying the Classical Lamination Theory. To directly measure tensile strength and lateral restraint pressure, tensile test and split disk test specimens were fabricated and then material experiments were conducted using a 2,000kN capacity UTM. The lateral restraint pressure of carbon sheet tube was about 5.4MPa and the tensile strength was 3,790Mpa, which is about 9.5 times the strength of steel reinforcing bars. The equation for predicting compressive strength of circular concrete confined by carbon sheet tubes manufactured at various angles was proposed through regression analysis. It is judged that this can be used as an analytical equation that can predict the strength in advance when a concrete column whose bearing strength has been lowered due to an earthquake, etc. is reinforced with a carbon sheet.

산업단지 폐기물처리시설 설치기준 개선 및 매립시설 설치를 위한 제도적 개선방안에 관한 연구 - 사업장배출시설계폐기물 중심 -

정인선,김선구 (사)한국열환경공학회 2022 열환경공학 Vol.17 No.1

Problems related to waste disposal, such as a shortage of landfill facilities and a surge in illegal waste, are becoming a major social issue. The quantity of wastes generated is continuously increasing, and the rate of wastes from facilities, which accounts for a high percentage of the quantity generated, is gradually increasing. In order to establish an appropriate capacity landfill facility installation plan when planning to develop of industrial complex that discharges large quantity of industrial wastes, the appropriateness of the current industrial complex waste treatment facility installation standards was reviewed, and institutional improvement measures were derived. The research results are as follows. First, industrial complexes showed a large difference in the distribution of the total site area and the industrial area by type, and the quantity of wastes generated in industrial complexes had a higher correlation coefficient with the industrial area than the total site area. Second, it was proposed to change from the total site area to the industrial area as an improvement plan for the area standard among the current standards for installation of industrial complex waste treatment facility. Third, the average value of the generated unit without considering the size of industry is applied to the generated unit, and there is a limitation in that there is a difference in actual quantity due to the application of the subjective generated unit due to the absence of guidelines for calculating the quantity of wastes generated and the application of the generated unit in the middle classification stage. Fourth, as an improvement measure to the calculation of the quantity of wastes generated in industrial complexes, it was proposed to be specified Industrial Complex Code of the Industrial Land Information System and Korea Standard Industry Code in waste discharge report form to improve utilization and subdivide the industrial waste classification unit. Fifth, considering the limitations of the current industrial complex waste treatment facility installation standards, regional concentration of landfill facilities, and lack of remaining capacity, a total amount management plan was proposed that comprehensively considers the overall status of landfill capacity. Sixth, a plan was proposed to introduce a performance guarantee system, enforcement fine imposition, and deposit system to introduce sanctions on non-fulfillment of the obligation to install waste treatment facilities in industrial complexes.

유기성 폐자원을 이용한 외부탄소원 적용시 질소제거 특성 변화에 관한 연구

오현일,정진도,조경환 (사)한국열환경공학회 2022 열환경공학 Vol.17 No.1

Waste water emitted from industrial facilities is increasing in relative inorganic content along with a decrease in the amount of organic matter every year, making it difficult to remove nutrients caused by high concentrations of organic matter in the early stages of wastewater treatment. In the wastewater treatment process, the denitrification process for nitrogen removal requires organic carbon as an electronic donor, so the addition of external carbon sources is necessary, but there is a concern of increased cost, obstruction of nitrification of residual organic carbon sources. The external carbon sources used for denitrification can include methanol, ethanol, and wastewater, which have been studied in various ways. However, failure to properly use these sources of external carbon can lead to a decrease in denitrification efficiency, which can lead to increased COD(Chemical Oxygen Demand), resulting in deterioration of water quality as well as a decrease in nitric oxide efficiency. Therefore, the purpose of this study was to investigate the nitrogen removal characteristics of wastewater when applying wastewater, methanol, and antibiotic-announced wastewater used as an external carbon source. This study was conducted in a biological diffuse reaction tank, and the KNO3 reagent was injected to 1.4 mg/L within the reaction tank to see the denitrification efficiency, and methanol, A negative wastewater, B negative waste water, and antibiotic fermented waste were injected in the same amount. Methanol, primary treated water, and antibiotic fermented waste reduced the total solids concentration of sludge in bioreactors by 5.2%, 17.4% and 3.4%, respectively, but the total solids concentration of A food wastewater and H food wastewater was increased by 9.1% and 8.3%, respectively. In addition, the concentration of T-N(Total Nitrogen) in bio-reactor treated water decreased by 15.6% and 0.97% and 0.85%, respectively, when methanol, primary treatment water and antibiotic fermented waste liquid were injected, but T-N in A food wastewater and H food wastewater negative waste water increased by 6.7% and 2.9%, respectively. The concentration of NO3 --N in methanol, primary treated water, antibiotic fermented waste solution, A negative wastewater, and H negative wastewater was reduced by 56.4%, 9.95%, 0.85%, 11.8% and 18.3%, respectively. If organic waste resources are applied as external carbon sources in the wastewater treatment process, it is possible to supply insufficient carbon sources during the denitrification process, but the nitrogen concentration of organic waste resources can rather increase the concentration of T-N. Further research on the possibility of decomposition of nitrogen sources contained in drinking water and antibiotic fermented waste liquid in the wastewater treatment process will be conducted through continuous experiments by type of organic waste resources.

옥외체육시설 조명환경에 따른 빛공해 영향 분석에 관한 연구 - 안양새물공원 상부체육시설 중심으로 -

정진산,김선구 (사)한국열환경공학회 2022 열환경공학 Vol.17 No.1

Light pollution intrusion light due to overuse and misuse of lighting, Urban Skyglow, Glare, Clutter, and Overillumination affect the human body's physiological process, and excessive light mainly causes confusion in night activities. This study suggested a way to reduce light pollution by measuring the vertical illuminance, discomfort glare index(UGR), and glare index(TI) of the residential area for light pollution caused by the lighting environment of outdoor sports facilities adjacent to the residential area. The results of this study are as follows. First, as a result of the illumination simulation, it was confirmed that the reference value according to the KSC illumination standard was met, and the lighting environment of the sports facility has no problem in proceeding with the game. Second, the maximum illuminance value of the vertical plane measured in the window of the residential area barely satisfies the reference value of 10[lx] or less. As a result of implementing it as a way to reduce light pollution, the maximum illuminance value of the vertical plane was measured from 0.94 to 9.82[lx] before improvement to 0.72 to 6.62[lx], and the maximum illuminance of the vertical plane after improvement was reduced by more than 20%. Third, the UGR index of residential area (apartment housing) was satisfied with the international standard of 22, and also satisfied with the domestic Central Environmental Dispute Committee's acceptance limit of 36, so there was no difference between before and after the change. Fourth, as a result of evaluating the unpleasant glare measured in the 500M range of the up and down lines, it was measured as 4.6[%] of the up line and 3.1[%] of the down line, and there was no difference before and after the change as a result of satisfying the unpleasant glare acceptance limit(10%). It is meaningful to use it as light pollution prevention lighting installation data for outdoor sports facilities in the future by presenting supplementary points for the "light radiation permission standard" of the "light pollution prevention method of artificial lighting" according to the lighting environment of sports facilities.

Polypropylene(PP), Polyethylene(PE) 폐플라스틱의 무촉매 열분해 특성 연구

박찬,김혁진,오세천 (사)한국열환경공학회 2022 열환경공학 Vol.17 No.1

Plastic is used for various purposes in everyday and industrial fields, and has excellent characteristics such as corrosion resistance and insulation. Plastic production is increasing every year, and waste plastics generated accordingly need to be treatment. Currently reclamation and incineration are used as waste plastics treatment methods, but secondary environmental pollution causes ground instability or emission of HCl and dioxin, so research on proper treatment and recycling is required. Therefore, polypropylene and polyethylene which account for a high proportion in waste plastic were used as samples in this study, the composition and pyrolysis characteristics of samples were considered through TGA, elemental analysis, and proximate analysis. In addition, activation energy according to the heating rate was derived using kinetic analysis based on TGA data, and pyrolysis was performed in the fixed bed reactor with the reaction temperature and heating rate as parameters. The yield was measured based on the mass change of solids and liquid products before and after pyrolysis, and we accordingly investigated the optimal reaction temperature and heating rate at which the highest yield can be obtained.