• Applied Chemistry for Engineering
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• v.22 no.3
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• pp.286-290
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• 2011

Syngas was produced out of pellet refuse derived fuel (RDF) produced from an RDF production facility of W city, Korea. A two-stage gasification system was developed to use the RDF char as an auxiliary heat source for gasification reaction. The composition and heating value of syngas as well as the heating value of residual product (char) were measured at a different residence time to investigate the optimal operating condition of the two-stage gasification system for syngas production. The optimal char residence time to minimize the energy cost due to an external heat source supply was also deduced.

• Korean Journal of Construction Engineering and Management
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• v.23 no.1
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• pp.73-82
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• 2022

Waste paint, one of the specified wastes in Korea, is currently treated entirely by incineration treatment method, and is hardly recycled compared to other wastes. Incineration treatment method also causes environmental problems such as air pollution. Thus, this study breaks away from the existing incineration treatment method of waste paint and switch to a method of pretreatment operation through evaporation, condensation, and thermal decomposition by temperature control. and then proposes a sustainable waste paint treatment process that can be recycled as an alternative energy heat source. If a new method of disposing of waste paint and technology for recycling are developed and disseminated, it is expected that the effect will be large from an economic and environmental point of view.

• Korean journal of applied entomology
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• v.3
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• pp.21-25
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• 1964

1. Purpose of this experiment is to investigate the influence of wheat scab fungus(Gibberella zeae) remaining in soil or residues of infected plants to the growth of the seedlings of 14 different crops. 2. Susceptibility of these crops to the infection by G. zeae was investigated by planting these crops both to the artificially inoculated soils and naturally infected soils where both serious and light wheat scab epidemic have occurred previously. 3. In artifical inoculation tests, bailey, wheat, rye, soybean, rice, buckwheat, corn, cotton and greenbean has shown susceptible reaction, while indianbean, sesame, sorghum, chinese cabbage and radish has shown resistant reaction. 4. In artificial inoculation tests, there was significant difference in the germination ratio of the susceptible crops between the plants planted in inoculated soils and uninoculated soils with the exception of rice, com and cotton. Preemergence seedling blight was confined only to barley and corn, whereas postemergence seedling blight was confined to rye, wheat, rice buckwheat, barley and corn. la most of the susceptible crops secondary roots were almost rotted and the primary roots were either partially rotted or discolorated in inoculated soil. There was significant difference in the stem length of the plants grown in inoculated soils and uninoculated soils in susceptible crops. 5. No infection by G. zeae was observed when wheat, barley and rye plants were sown to the soils where both serious and light wheat scab epidemic occurred naturally.

• Korean Journal of Agricultural Science
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• v.9 no.2
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• pp.562-568
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• 1982

These studies were carried out to investigate of detection of Fasciola egg from positive cattle faces in the intradermal reaction method by laborsaving composition of sieves and Kim's sedimental tube method. The results obtained are summerized as follows: 1. Detection method of Fasciola eggs was improved by 3 meshes(100mesh, 150mesh, 250mesh) for filtration of fecal fluid contained Fasciola eggs. 2. III type of tube in the 3 kinds of sedimental tube had the highest recovery rate of Fasciola egg. Thus, this type of tube was selected and called as Kim's sedimental tube. 3. A-II, A-III, B-III and C-III type by Kim's sedimental tube method had the recovery rates of eggs in the 1st dropping as ranged 99 to 100% and A-I, B-II, C-I and C-II as 71 to 91%. 4. All types as themselves contained the special aspects. In the these type was useful to determine the results in the urgent cases add to shorten the time of the diagnostic procedures. 5. Kim's sedimental tube method high recovery rate and convenient procedures as compared with other detection methods reported. In addition, through this method can also obatained E. P. C. value. Therefore, it is desirable that Kim's sedimental tube method be recommended by clinicians.

• Proceedings of the Korean Geotechical Society Conference
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• 2004.03b
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• pp.692-697
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• 2004

This study is on the increasement of strength about soft ground improvement material using waste residual(paper fly ash, coke ash, slag) by fire. Through this study the authors have analyzed the strength improvement of mixed soft silty sand with improvement materials. The strength of mixed soils with high mixture ratio and more curing days increased. But CA-30(cokes 60%) make more low strength improvement than others. Therefore the authors find out that paper fly ash+cokes, paper fly ash+slag or cokes+slag improvement material is more effect in improvement of soft silty sand than cokes+cenlent. And Ettringite reaction is free mixed soils with more than two materials.

• Proceedings of the Korea Institute of Fire Science and Engineering Conference
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• 2011.11a
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• pp.205-208
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• 2011

최근 사용하는 소방배관의 현장 시공에 사용되는 공법 및 부속을 살펴보면 정통방식의 부속연결 방식, Tee 가공방식, 분기관 방식을 사용하고 있다. 이 방식 중 가장 많이 사용되고 있는 방식은 Tee가공 방식과 분기관 방식으로 이는 우리나라의 소방배관 시설의 규모로 보았을 때 부속과 공법이 미흡하다 할 수 있다. 기존의 공법은 현장 적용성이 떨어지고 화재안전 성능이 미흡하다 할 수 있으며 사회가 발달 하며 건축물의 형태가 다양해지고 초고층화가 이루어지고 있는 과정에서 본 연구에서는 현재사용 하고 있는 공법의 분석과 새로운 소방배관 부속을 개발 하려 한다.

• Journal of the Korea Organic Resources Recycling Association
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• v.13 no.1
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• pp.100-114
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• 2005

Organic waste, which is defined as wastes derived from various biological organisms that contain more than 40% of organic materials, is generated about 100 million tons per year in Korea. These organic wastes are now controlled by several governmental entities, under different rules and regulations, leading to the improper management and inefficient treatment. Therefore, integrated management system is primarily needed for the efficient recycling of organic waste. In this study, six kinds of organic wastes, which are food waste, sludges(sewage, waste water, night soil), animal excreta, animals and plants residues, and three kinds of recycling by-products(compost, feed, anaerobic digestion by-products) made of organic wastes, were analyzed for their physical and chemical characteristics. On the basis of this result, a possibility for the efficient recycling of organic waste was investigated.

• Korean Journal of Environmental Agriculture
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• v.21 no.4
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• pp.274-278
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• 2002

Nitrate removal rate in three wetland cells was examined. The acreage of each cell was 150 $m^2$. They were a part of a stream water treatment demonstration system which was composed of two ponds and six wetland cells. Earth works far the pond-wetland system were finished from April 2000 to May 2000 and reeds were planted in the three cells in May 2001. Waters of Sinyang Stream flowing into Kohung Esturiane Lake located southern coastal area of Korean Peninsula were pumped into a primary pont Effluents from a secondary pond were funneled into the three cells. Volumes and water quality of inflow and outflow were analyzed from July 2001 through December 2001. Inflow and outflow averaged 20 $m^3/d$ and 19.3 $m^3/d$, respectively. Hydraulic retention time was 1.5 days. Average influent and effluent nitrate concentration was 2.30 mg/L, 1.75 mg/L, respectively. Nitrate removal rate in the three cells averaged 80.9 $mg/m^2/day$. Seasonal changes of nitrate retention rates were closely related to those of wetland temperatures. Full growth of reeds within a few years can develope litter-soil substrates beneficial to the denitrification of nitrate, which may lead to increases of the nitrate retention rates.

• Journal of Mushroom
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• v.5 no.2
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• pp.76-80
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• 2007

After bottle culture of Pleurotus eryngii, media were taken out the bottle and normally utilized compost. However, nutritional elements were remained in the waste media. This study was carried out to investigate the reusable possibility and the optimal additive rate of waste media in an artificial cultivation of Pleurotus eryngii. The pH had tendency to decrease as the waste media was added from 6.0 to 4.8. Based on the additive rate of 10, 20, 30, 40, and 50%, each treatment waste media was added to new media for culturing Pleurotus eryngii. Among various treatments, the mycelial growth and primordia formation of Pleurotus eryngii were more favorable in the addition of 10-30% waste median than in the addition of 40 and 50%. The yield of its fruiting body was increased slightly in the treatment of 10-30% waste media.

• Korean Chemical Engineering Research
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• v.47 no.1
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• pp.89-95
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• 2009

Because of high contents of cellulose (~37 wt%) and hemicellulose (~17%), rice straw seems to be a potential lignocellulosic biomass for production of bioethanol. In this study, Ammonia Recycled Percolation (ARP) pretreatment of rice straw was extensively investigated. In particular, the experimental study included the effects of temperature, reaction time and concentration of ammonia on compositions and enzymatic digestibility of the resulting solid residues; the ranges of pretreatment conditions were, in turn, $150{\sim}190^{\circ}C$, 10~90 min and 0~20 wt%. Through ARP pretreatment, the lignin content was reduced by as high as ~84% while 20~80% of the hemicellulose was also solubilized. The solid residue resulted from the pretreatment with 15 wt% aqueous ammonia solution at $170^{\circ}C$ for 90 mim showed as high as ~90% of digestibility with 15FPU/g of glucan enzyme loading. Supplement of xylanese to cellulase led to a notable enhancement of digestibility, indicating a discernable inhibitory role of hemicellulose. Simultaneous Saccharification and Fermentation (SSF) and Simultaneous Saccharification and Co-Fermentation (SSCF) were performed to obtain ethanol productions of 13.8 g/L (corresponding to 81% yield) and 15 g/L (corresponding to 89% yield), respectively.