• 제목/요약/키워드: Waste-to-Energy

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파이로프로세싱 발생 LiCl염폐기물의 열발생 (Thermal Release of LiCl Waste Salt from Pyroprocessing)

  • 김정국;김광락;김인태;안도희;이한수
    • 방사성폐기물학회지
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    • 제7권2호
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    • pp.73-78
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    • 2009

  • 사용후핵연료 파이로프로세싱의 전해환원 공정에서 발생하는 LiCl 염폐기물내 Cs과 Sr의 방사능 붕괴열을 계산하였다. 계산시 대부분의 LiCl염폐기물을 재생하여 재활용하고 나머지를 고화체로 만든다고 가정하였다. 계산결과 Cs 및 Sr의 붕괴로 생성되는 자핵종인 Ba와 Y에 의한 열발생량이 모핵종에 비해 최대 4.6배 더 많았다. LiCl염폐기물내 Cs 및 Sr에 의한 열발생은 초기 한달 정도에 최대이므로 일정 기간 초기 LiCl염폐기물의 온도 급상승을 제어할 냉각설비의 운영이 바람직할 것으로 보인다.

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2단(유산발효+광발효) 발효공정을 통한 음식물쓰레기로부터의 수소생산 (Biohydrogen Production from Food Waste by Two-Stage (Lactate+Photo)-Fermentation Process)

  • 김옥선;손한나;김동훈;전동진;이영우;김미선
    • 한국수소및신에너지학회논문집
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    • 제22권3호
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    • pp.333-339
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    • 2011

  • In the present work, it was attempted to produce $H_2$ from food waste by the two-stage fermentation system. Food waste was acidified to lactate by using indigenous lactic acid bacteria under mesophilic condition, and the lactate fermentation effluent (LFE) was subsequently converted to $H_2$ by photo-fermentation. $Rhodobacter$ $sphaeroides$ KD131 was used as the photo-fermenting bacteria. The optimal conditions for lactate fermentation were found to be pH of 5.5 and substrate concentration of 30 g Carbo. COD/L, under which yielded 1.6 mol lactate/mol glucose. By filtering the LFE and adding trace metal, $H_2$ production increased by more than three times compared to using raw LFE, and finally reached the $H_2$ yield of 3.6 mol $H_2$/mol lactate. Via the developed two-stage fermentation system $H_2$ yield of 5.8 mol $H_2$/mol glucose was achieved from food waste, whose value was the highest that ever recorded.

  • https://doi.org/10.7316/khnes.2011.22.3.333 인용 PDF KSCI

Preparation of the Applicable Regulatory Guideline on Mixed Waste in Korea Based on the Analysis of US Laws and Regulations

  • Sim, Eun-Jin;Lee, Sun-Kee;Kim, Chang-Lak;Kim, Tae-Man
    • 방사성폐기물학회지
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    • 제19권1호
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    • pp.141-160
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    • 2021

  • Unit 1 of the Kori Nuclear Power Plant (NPP) and Unit 1 of the Wolsong NPP are being prepared for decommissioning; their decommissioning is expected to generate large amounts of intermediate-level, low-level, and very low level Waste. Mixed waste containing both radioactive and hazardous substances is expected to be produced. Nevertheless, laws and regulations, such as the Korean Nuclear Safety Act and Waste Management Act, do not define clear regulatory guidelines for mixed waste. However, the United States has strictly enforced regulations on mixed waste, focusing on the human health and environmental effects of its hazardous components. The U.S. Nuclear Regulatory Commission and the U.S. Department of Energy regulate the radioactive components of mixed waste under the Atomic Energy Act. The U.S. Environmental Protection Agency regulates the hazardous waste component of mixed waste under the Resource Conservation and Recovery Act. In this study, the laws, regulations, and authorities pertaining to mixed waste in the United States are reviewed. Through comparison and analysis with waste management laws and regulations in Korea, a treatment direction for mixed waste is suggested. Such a treatment for mixed waste will increase the efficiency of managing mixed waste when decommissioning NPPs in the near future.

  • https://doi.org/10.7733/jnfcwt.2021.19.1.141 인용 PDF KSCI