A Sruvey Report for the Development of Highly Efficient Drying Systems

funder : 산업자원부고효율 건조기 개발을 위해서는 현황파악은 물론 건조기별 특성 파악을 통한 핵심기술 및 주변기술을 파악하고 중점적으로 개발하여야할 기술개발과제 도출이 우선되어야 한다. 이러한 작업을 위해서는 우리나라의 현 기술수준 및 건조기 산업의 실태파악이 중요하므로 건조기 제작업체 및 사용업체를 대상으로 설문조사를 기획, 우편조사 및 방문조사를 실시하였으며 동 설문조사를 통하여 문제점을 파악하였다. 다음으로 건조기 종류가 다양함을 감안하여 기술적으로 접근이 용이하도록 건조기를 작동상 특성별로 재분류하였으며, 재분류된 건조기를 대상으로 건조 형식별 개별적인 특성을 파악하였다. 건조기의 특성에 따라 핵심기술 및 주변기술을 발굴하여 건조기의 기술체계도(Tech. Tree)를 작성하였다. 기술체계도를 바탕으로 우리나라의 현 기술수준을 파악하고 이에따른 건조기 형식별로 향후 개발되어야 할 기술개발과제를 도출(총 36개)하였다. 총 36개의 도출된 각 과제를 대상으로 기술개발방안에 대한 개괄적인 내용을 제시하였다. 각 세부과제별로 개발되어야 할 건조기의 주요사양을 비롯하여, 개발대상 핵심기술 및 주변기술 그리고 연구개발형태, 연구기간, 소요 연구비 등의 개발방법 등을 제시하였다.A long-term plan for the development of highly efficient drying systems is established in this project. For the plan, the dryer manufacturer and user are surveyed to understand the current state of the domestic drying industry. Next, the drying system is classified by its operation characteristics, which leads to the easier systematic approach to the plan. Technical trees that include the core and peripheral technologies are completed. Thirty-six long-term projects are then proposed with the consideration of the current state of the art about a dryer. Each proposed project consists of general aspects, the main specification, key technology containing supplements, research period and finally the related budget

Hazardous Waste Treatment Technology;Hazardous Waste Solidification Technology

funder : 환경부슬러지나 액상 분상 폐기물을 고형화 하기 위해 고형화 대표적인 물질인 포틀란드 시멘트와 석회, 규산염, 플라이 애쉬와 계면활성제, 고화촉진제, Chelate 등에 대한 특성 파악과 과화제의 특성과 고화기구 파악 등이다. 국내의 화성 및 온산 특정 폐기물 처리시설에서 운전중인 고형화 기술의 문제점을 파악하고 일본, 미국, 유럽 각국의 실용화 기술을 중심으로 현황 조사 및 기술자료 수집에 있으며 그 내용은 다음과 같다. 1. 고화 방법의 국내 현황 파악 2. 현장 문제점 도출 3. 일본 및 유럽의 현황 조사 4. 고화제, 감수제 등 첨가제 평가 5. 고화체의 유해물질 용출시험 6. 고화제, 첨가제의 응용Most develiping countries encounter numerous problems regarding waste treatment. Waste is the useless material discharged from households and industrial fields. All of waste is generated from the life of human beings inevitably, and liquid phase, solid phase, mixed phase. The quality and quantity of the wastes become to change depending on times and location. In Korea 3.994 tones of specified wastes were generated from industrial fields in 1995. The specified waste is the hazardous material which can cause the pollution of the surrounding environment like a oil sludge, a planting sludge, a waste oil and so on. Typical treatment method of hazardous waste is solidification. The goal of soidification/stabilization is to accomplish one or more thing, which is the reduce pollutant mobility, decrease surface area and produce solid with no free liquid. By performing these methods, handling and physical characteristics of waste is improved. Solidification/Stabilization is a proven technollogy for the treatment of hazardous wastes, Much of the Solidification/Stabilization is based on the chemistry of lime and cement. Solidification technique is used for binder : organic like a Polyethylene, Formaldehyde and so on. Hazardous wastes are converted by solidification/chemical fixation system (CFS) into nontoxic products. Many CFS processes have additive built into the formulatin for solidification purposes as well as to fix metals and other hazardous constituents like wetting agent, calcium chloride, sodium silicates and silica fume etc. Typical process for solidification is cement base system and occurs hydration reaction as tobermorite. Solidification technique reduces risk by converting waste. Therefore, waste becomes to be less soluble, less mobile and less toxic form mintaining physical natures. Physical properties of solidification matrix is dependent on binder accelerator, retarder, flocculant and interfering mechanism etc. One of the major deficiencies in cement based waste solidification/stabilization(s/s) processes are their difficulties in treating inorgaic wastes containing orgaic contaminant, reactive mineral clays and fly ash which had been studied as pozzolanic reagents and pre-solidification sorbents of orgaic components. Organic component and heavy metal of waste were well adsorbed by the adsorbents. Successful adsorbents for the organic contaminant and heavy metals in hazardous wastes should enable them to treated by cement-based solidification