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박기학 ( Kihak Park ),이호식 ( Hosik Lee ),하준수 ( Junsu Ha ),김극태 ( Keugtae Kim ),임채승 ( Chaeseung Lim ) 한국물환경학회(구 한국수질보전학회) 2021 한국물환경학회지 Vol.37 No.2
It is generally known that a wastewater treatment plant (WWTP) consumes immense energy even if it can produce energy. With an aim to increase the energy independence rate of WWTP from 3.5% in 2010 to 50% in 2030, the Korean government has invested enormous research funds. In this study, cost-effective operating alternatives were investigated by analyzing the energy efficiency and economic feasibility for biogas and power generation using new and renewable energy. Based on the US EPA Energy Conservation Measures and Korea ESCO projects, energy production and independence rate were also analyzed. The main energy consumption equipment in WWTP is the blower for aeration, discharge pump for effluent, and pump for influent. Considering the processes of WWTP, the specific energy consumption rate of the process using media and MBR was the lowest (0.549 kWh/m<sup>3</sup>) and the highest (1.427 kWh/m<sup>3</sup>), respectively. Energy-saving by enhancing anaerobic digester efficiency was turned out to be efficient when in conjunction with stable wastewater treatment. The result of economic analysis (B/C ratio) was 2.5 for digestive gas power generation, 0.86 for small hydropower, 0.49 for solar energy, and 0.15 for wind energy, respectively. Furthermore, it was observed that the energy independence rate could be enhanced by installing energy production facilities such as solar and small hydropower and reducing energy consumption via the replacement of high-efficiency operating.
사용후 커먼레일 디젤엔진의 성능복원을 위한 재제조 기술 연구
이호길(Hokil Lee),우재환(Jaehwan Woo),정도현(Dohyun Jung),송현석(Hyunseok Song),하치상(Chisang Ha),강춘길(Chunkil Kang) 한국자동차공학회 2014 한국자동차공학회 부문종합 학술대회 Vol.2014 No.5
Recent settlement of the industrial society of mass production and mass consumption brings about an exhaustion of natural resources and global warming. Therefore, various researches are under way for the pursuit of resource utilization and environmental protection at the same time. In Europe and America, the remanufacturing industry has been systemically managed as a higher-value. on the other hand, In our country remanufacturing industry has not established of quality assurance system. So, This paper analyzes the common rail diesel engine remanufacturing process, also engine performance test implements to retain remanufacturing engine reliability. As well, vehicle emission performance test implements to compare used vehicle and remanufacturing vehicle. The results in this paper, in accordance with apply the remanufacturing technology to used engine almost restore with the new engine level.