• 유기물자원화
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• 제9권1호
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• pp.49-55
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• 2001

남은 음식물을 갈아 액상으로 만든 기질을 이용하여 생효모를 함유한 생균제제사료(probiotics)를 생산하기 위해 효모의 호기적 액상발효를 시도하였다. 기질의 영양조성의 최적화를 위해 미리 진탕배양한 결과를 토대로 액상의 남은 음식물 기질에 우레아($0.5g/{\ell}$), 당밀($4g/{\ell}$), O-phosphate($0.4g/{\ell}$), yeast extract($1g/{\ell}$)를 첨가하여 2리터 용량의 발효기를 이용하여 Kluyveromyces marxianus와 Aspersillus. oryzae를 접종하여 통기발효 시킨 결과 12시간 내에 $1.4{\times}10^{10}/liter$의 생균효모농도를 얻을 수 있었다.

• 한국건설순환자원학회논문집
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• 제4권1호
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• pp.89-95
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• 2009

현행 "건설폐기물의 재활용 촉진에 관한 법률" 시행령 별표1에서는 다양한 성상으로 배출되는 건설폐기물의 종류를 17가지로 구분하고 이중 제17호의 혼합폐기물은 건설폐토석을 제외한 나머지 15가지 성상의 건설폐기물중 둘 이상의 건설폐기물이 혼합된 것으로 정의하고 있다. 이중 폐콘크리트, 폐아스콘과 같은 건설폐재류는 대부분이 순환골재와 같이 재활용되고 있으며 폐금속과 같은 유가성 자재류는 대부분 분리 판매되어 2차 제품 제조등에 활용되고 있다. 그러나 폐목재, 폐합성수지, 폐섬유 등과 같은 가연성 폐기물의 경우 발열량이 높고 인체에 해로운 중금속 함유량이 적어 RDF나 RPF와 같은 에너지 연료로 활용이 가능하지만 상당량이 혼합폐기물 형태로 배출되어 단순 소각 및 매립되고 있는 실정이다. 그러므로 본 연구에서는 단순하게 외관상의 분류만을 고려하여 설정한 현행 "건폐법"과는 달리 최초 발생단계에서부터 최종처리까지 건설폐기물의 흐름을 보다 효율적으로 제어할 수 있도록 건설폐기물의 분류를 크게 가연성, 불연성, 가연성 불연성 혼합, 기타 등으로 분류하였다. 가연성 폐기물의 경우 기존의 소각 폐기물을 중심으로 폐목재, 폐섬유 등 기존의 소각 폐기물을 중심으로 분류를 하고 불연성은 재활용이 원활한 건설폐재류와 기타로 구분, 혼합건설폐기물은 발생 자체부터 서로 다른 물질이 결합되어 있어 분리 자체가 어려운 폐기물을 대상으로 하였다. 또한 이상에서 폐기물은 지정폐기물을 제외하고 모든 기타 폐기물로 분류하도록 하였으며 기본적으로 건설현장에서 발생하는 폐기물은 1차적으로 가연성, 불연성, 혼합폐기물로 분류하여 배출하는 시스템이 되도록 폐기물의 분류를 실시하였다.

• 한국자원리싸이클링학회:학술대회논문집
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• 한국자원리싸이클링학회 2001년도 정기총회 특별강연 및 춘계학술연구발표회(2)
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• pp.121-125
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• 2001

For the probiotic feed production, aerobic liquid fermentation of pulverized food wastes was attempted with a yeast Kluyveromyces marxianus. After grinding finely, optimal fermentation conditions of the substrate was investigated by shaking culture. The most active growth of the yeast was shown at solid content of 10%. The proper addition of urea(0.5g/l), o-phosphate(0.4g/l), molasses(4g/l), and yeast extract (1g/1) increased cell growth rate and viable cell count. For optimizing, the nutrients were all added to substrate and fermentation was carried in 2 litre jar fermenter. For the stimulation of hydrolyzing enzyme excretion, mixed culture with Aspersillus oryzae was also conducted. In 12 hours of fermentation, viable cell count of the yeast Kluyveromyces marxianus amounted to the number of 1.4 $\times$10$^{10}$ /1 in the culture medium.

• Journal of Contemporary Eastern Asia
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• 제14권2호
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• pp.17-36
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• 2015

As an effort of mitigating hazards, pro-environmental programs have been vigorously activated with regard to solid waste recycling. It is beneficial for both the environment and resource saving, but implementation and enforcement are hard to achieve voluntarily. The South Korean Government first implemented the Deposit Refund System (DRS) and later the Extended Producer Responsibility Program (EPR) to reduce waste and encourage recycling in South Korea. Un-der the DRS, producers would pay for recycling the wastes of the products. The government then repealed the DRS and implemented the EPR program. Under this program, the producers recycle as much as the Ministry of Environment determines or pay a penalty for an excessive amount of the waste. In the broader perspective of disaster management, such policy programs can mitigate environmental hazards. This paper compares those two programs that facilitated the level of recycling, focusing on how such programs regulate producers and how they were operated from the perspective of implementation and enforcement.

• 한국콘크리트학회:학술대회논문집
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• 한국콘크리트학회 2003년도 봄 학술발표회 논문집
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• pp.805-810
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• 2003

It is the real circumstance in the country that not only the data and special books but also people who have an expert knowledge are short of the field of the study about plastic wastes, so that to build the Database carrying out gathering info of that is the present question obviously. The business on recycling plastic, for some reason or other, is one of the best ways as called bright prospect industry to prevent environmental pollution and obtain economical outcome by using limited resources. Plastic wastes with construction industry especially using Polymer may have a good effect on the environment and human beings and have a fine view to produce functional and Eco-friendly concrete as well. In this study, Chemical resistance and Water Absorption test in Polymer concrete using bentonite as a shrinkage control agent was made an experiment by comparing with influence on concrete strength and used to offer some valuable data about Polymer concrete.

• 한국신재생에너지학회:학술대회논문집
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• 한국신재생에너지학회 2010년도 춘계학술대회 초록집
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• pp.209.1-209.1
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• 2010

본 연구에서는 울산산업단지 및 인근 지자체에서 발생하는 가연성폐기물 중 화학산업의 원료로 공급하기 위하여 활용가능한 폐기물들을 선정하고, 선정된 폐기물들의 안정적인 수급을 위하여 자원순환네트워크를 구축하는 연구를 수행하였다. 활용가능한 폐기물을 선정하기 위하여 먼저 선정기준을 설정하고, 울산지역에서 발생하는 가연성폐기물의 발생 및 처리현황, 폐기물의 특성 등을 고려하여 활용가능량을 산출하였다. 또한 이들 폐기물을 지속적으로 수급하기 위하여 울산산업단지 기업과 지자체, 합성가스 이용 업체 등으로 구성된 컨소시움을 구축하는 방안을 제안하였다.

• 자원리싸이클링
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• 제5권2호
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• pp.52-56
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• 1996

콘크리트 건설폐기물 중에서 재활용이 가능한 천연골재(모래, 자갈)를 분리하기 위하여 분쇄특성을 조사하였다. 30mm이하의 파쇄물을 롤분쇄기와 함마분쇄기를 사용하여 분쇄한 결과, 시멘트콘크리트가 아스팔트콘크리트보다 미세한 입자크기로 분쇄되는 반면, 함마분쇄물이 롤분쇄물보다 골재와 기타물질간 분리가 양호하게 나타났다. 분쇄한 콘크리트를 다시 Shaking table을 사용하여 비중분리실험한 결과, 70∼90% 이상의 높은 천연골재 함유율을 얻을 수 있었다.

• 자원리싸이클링
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• 제5권4호
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• pp.17-24
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• 1996

The computer simulation model was established to verify the applicability of smelting reduction concept to treatment of industrial wastes which becomes issue on the enviromental and recycling view point. Computer simulation model provides as following results. The increase of post combustion ratio(PCR) and heat transfer efficiency of PC energy(HTE) is effective ways to save energy. But, in order to increase PCR, recovery efficiency of post combustion energy(HTE) have to be higher than 85% HTE considering refractory life and saving energy together. Coke is most useful fuel source because it shows lowest dependence of PCR and low hydrogen content. The quality of hot metal of current process would be expected to the similar level with that of blast furnace. The utilization of scrap and Al dross can be also possible to maximize the advantages of current process which is high temperature and chemical dilution with hot metal and slag. In case of scrap, energy consumption was slightly increases because of heating up energy of scrap. Consquently, current process concept provides the possibility of intergrating recycles of industrial wastes materials such as EAF slag, coke oven dust, life terminated acidic refractory, aluminium dross and scrap by smelting reduction process.

• 한국분말재료학회지
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• 제13권2호
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• pp.102-107
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• 2006

Recycling industrial wastes such as fly ash from a coal burning heat power plant and shell from an oyster farming were investigated to prevent environment contamination as well as to enhance the value of recycling materials. In this study, the lightweight aggregates and the red bricks were fabricated from fly ashes with other inorganic materials and wastes. The starting materials of the lightweight aggregate were fly ash powder and water glass, and the compacts of these materials were heat treated at $1100^{\circ}C$. The fabricated lightweight aggregates had low bulk density, $0.9-1.2\;g/cm^3$, hence floated on the water and had the strength of 7.0-11.0 MPa and the modulus of 2900-3300 MPa which indicates it has enough strength as the aggregate. Another type of the light weight aggregate was prepared from fly ashes, shell powders and clays. The bulk density, porosity, and compressive strength of these aggregates were $1.19-1.34\;g/cm^3,\;18.3{\sim}56.1%$ and 5-12 MPa, respectively. The addition of a small amount of fly ash powder prevented hydration of the light weight aggregates. The red brick was also fabricated from the fly ash containing materials. It is suitable for the brick facing of a building as it has moderate strength and low water absorption rate.

• 한국환경보건학회지
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• 제20권4호
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• pp.60-71
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• 1994

The average volume of waste per a person in Korea is exceedingly higher than that of Europeans. But the social movement for the resources recycling and the environmental conservation makes the people play their part in several activities like the Separate Collection System. At the time of this agitation, Korean central government brought the Volume Based Waste Charge System into operation in some regions on a trial basis having full-scale operation nationwidely near at hand. Andong City which is one of points under trial operation had remarkble result during this term in resources recycling as well as wastes reducing. The wastes' diminution reached to 32.0 % and the resources recycling was increased by 13.7 times. The responses from the 701 housewives in Andong were also very stimulative. The neccesity of this system was judged conclusively by 91.6 % of total answerers. Also this system was considered as a successful one by 78.4 % popular support. But not little portion (53.8 %) of the answerers felt that the detail methods of this system were unconvenient. In order to take root this system in it's early stages, the Separate Collection should be carried out perfectly and systematically with top priority. And the next program should be the improvement of the detail methods in this system.