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음폐수 농도에 따른 음식물류 폐기물 자원화 시설의 전과정 영향 평가에 관한 연구
황용우,민달기 한국폐기물자원순환학회 2012 한국폐기물자원순환학회지 Vol.29 No.4
In this study, life cycle assesment (LCA) was conducted based on a functional unit of 1 ton of food waste recycling from collection and transportation to treatment processes such as feed production, composting, other recycling and incineration for 45 public food waste recycling plants. The Korean life cycle inventory (LCI) data were used for the main input material and energy. For the other input data, which could not be provided by the Korean LCI database, data of other countries were used from the database by Ecoinvent, and the strength of food wastewater for LCI DB was divided low and high concentration. In case of low strength of food wastewater, environmental impacts were suggested incineration, composting and feed production in the order, where collection and transportation were identified as the major influencing factors by contribution analysis and sensitive analysis. Contrary, in case of high strength of food wastewater, environmental impacts were suggested composting, feed production and incineration in the order, where treatment of food wastewater was identified as the major influencing factor. Therefore, discharge volume as well as concentration of food wastewater was found to be important parameter of the LCA.
음식물류 폐기물 자원화의 표준 설치·운영비용 분석에 관한 연구
황용우,민달기 한국폐기물자원순환학회 2012 한국폐기물자원순환학회지 Vol.29 No.6
This paper is a research on the economical analysis of the food waste recycling in order to enhance the proper management of food waste. In Korea, food waste is separated from the source compulsorily and treated on the feed, compost and other recycling plant. In this study the present economical evaluations of food waste recycling plants, such as collection & transportation, construction, operation cost and B/C analysis, is investigated. Based on a food waste recycling plants with a 50 ton/day, costing analysis was conducted by the present value criterion technique. The actual operation costs for directly operated plants were 88,358 won/ton for feed production, 79,015 won/ton for composting, 49,934 won/ton for other recycling, and 96,285 won/ton for incineration. When the profit from products sale for each recycling system and the depreciation cost of plants were considered, the costs for direct operation were 95,784 won/ton for feed production system, 96,824 won/ton for composting system, 56,576 won/ton for other recovery system and 143,776 won/ton for incineration system. And when a new facility is constructed, feed production could be favorable in operation cost and environmental aspects.
과불화합물 물질흐름도 작성 및 함유제품 관리체계 구축연구
황용우,박지형,박광호,이영설,민달기 한국폐기물자원순환학회 2018 한국폐기물자원순환학회 학술대회 Vol.2018 No.05
과불화합물(PFCs, Perfluorinated compounds, 이하 과불화화합물) 등은 발암성, 생식독성, 생농축성 등을 가지고 특히 장거리 이동성을 가지고 있는 대표적인 잔류성 유기오염물질로 분류되고 있다. 스톡홀름 협약은 사전예방 원칙에 입각하여 잔류성 유기오염물질로부터 인간의 건강 및 환경 보호를 목적으로 하는 국제협약으로 ’04년 5월 발효되었다. 우리나라는 ’01년 10월 협약에 서명한 후 협약가입을 위해 잔류성유기오염물질의 배출 실태를 파악하고, 관련 법규를 제정하는 등 협약가입 준비 후, ’07년 2월에 가입하였다. 제4차 스톡홀름협약 당사국총회에서 과불화옥탄술폰산(PFOS)과 그 염류 등은 규제 대상물질로 등재(’09.4)하였으며, PFOS의 경우 용도에 따라 항구적 면제(Acceptable purpose), 특정면제(Specific Exemption), 사용제한하고 있으며 PFOA는 스톡홀름협약 POPs 검토위원회(POPRC)에서 위해성 검토 중으로 규제예고 되어 있다. 하지만 국내에서는 최근 아웃도어용품 등의 방수 기능성 제품에서 과불화화합물이 검출되어 논란이 일어나는 등, 과불화화합물의 위해성에 대한 관심이 증대되고 있으나, 과불화화합물 함유 제품 및 폐기물의 관리체계는 초기 정비 단계로, 스톡홀름 협약의 이행 및 과불화화합물 함유 제품 및 폐기물의 체계적 관리가 필요한 시점이다. 이에 본 연구에서는 스톡홀름협약 이행과 과불화화합물 함유폐기물을 적정처리를 위해 과불화화합물의 생산・사용・폐기 등 전과정 물질흐름분석을 통해 정량적인 자료를 확보하고, 물질과 제품의 사용용도별 폐기물 관리체계를 마련하였다.
Life Cycle Assessment(LCA)을 도입한 오니처리시스템의 평가
황용우,권봉기,유성호 대한상하수도학회 1997 상하수도학회지 Vol.11 No.2
Life cycle assessment (LCA) on total sewage sludge treatment system from thickening to incineration and melting was performed for estimating global environmental impact as CO_2. In general, the life cycles of actual treatment facilities consist of construction, operation and dismantlement. In this study, the amount of CO_2 produced from both whole and each life cycle step of currently used unit sludge treatment processes were calculated by inventory analysis. In addition, in the all processes investigated in this study, individual CO_2 production unit (CPU), i.e. total produced CO_2 by treating a unit weight of sludge was also calculated. By using the CPU matrix of the unit processes, it was possible to simulate the CO_2 production for any type of complex-system as well as to trace a dominant cause of CO_2 production in each process. Four selected alternatives examined here, each involve the same disposal way but differ substantially in the CO_2 exhaust.