• Title, Summary, Keyword: rice husk

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The effects of biomaterials in growing medium on the response of Zelkova serrata in a containerized production system

  • Youn, Woo-Bin;Han, Si-Ho;Seo, Jeong-Min;Aung, Aung;Dao, Huong Thi Thuy;An, Ji-Young;Park, Byung-Bae;Cho, Min-Seok
    • Korean Journal of Agricultural Science
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    • v.46 no.4
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    • pp.781-790
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    • 2019
  • Changes in the physical and chemical properties of soil materials during the nursing process have a great influence on the quality of containerized seedlings and on growth and survival after planting. In this study, the effect of biomaterials and their mixed ratios on the growth of Zelkova serrata seedlings in a containerized seedling production system was investigated. Mushroom sawdust, pine bark, and carbonized rice husk were used as biomaterials. The mixed ratios were 10% and 20% volume ratio of the growing medium volume, including the untreated controls. There was no significant difference in the height growth of the Zelkova serrata seedlings according to the biomaterials. The root collar diameter was the highest with the 20% carbonized rice husk and the lowest with the mushroom sawdust. The difference between the highest quality index and the lowest quality index was 30% in the order of the carbonized rice husk, pine bark, control, and mushroom sawdust, but there was no statistical significance. In this study, if the growing medium mixed with biomaterials does not reduce the seedling growth compared with the control, it is considered that the biomaterial can replace a part of the growing media. Therefore, the results show that some of the growing media can be replaced with carbonized rice husk or pine bark when producing Zelkova serrata seedlings.

Soil Stabilization with time and Rice Husk Ash (Rice husk ash를 이용한 토질안정처리)

  • 민덕기;황광모;김현도;황택진
    • Journal of the Korean Geotechnical Society
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    • v.18 no.5
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    • pp.19-25
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    • 2002
  • In this paper, a laboratory investigation was carried out to change the geotechnical properties of clayey soil with quicklime and rice husk ash for surplus soil strength improvement. The organic content of soils is 8.67%, 6.45% and 3.84% respectively. The geotechnical properties of treated soil were evaluated by a series of laboratory unconfined compression test, consolidation test and etc. The test results indicated that the presence of RHA enhanced the efficiency of lime stabilization. Especially, the increase in strength is very high at the first stage, while the significant improvement occurs in a sample C with organic content of 3.84%. These results can be identified by X-ray diffraction(XRD) and scanning electron microscope(SEM). The results of consolidation test indicate that the presence of RHA with lime reduces the properties of swelling of soil. Thus, it was verified that the addition of RHA is more effective than using only lime for soil stabilization.

Wet Fine Grinding of Rice Husk Ash using a Stirred Ball Mill (교반 볼밀을 이용한 왕겨재의 습식 미세분쇄에 관한 연구)

  • Park, S.J.;Kim, M.H.;Choi, Y.K.
    • Journal of Biosystems Engineering
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    • v.31 no.1
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    • pp.33-38
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    • 2006
  • This work was conducted to find the operating characteristics of an efficient wet grinding system designed to obtain fine rice husk ash powder. Once the rice husk was combusted and the thermal energy was recovered from the furnace, the ash was fed and pulverized in the grinding system resulting a fine powder to be used as a supplementary adding material to the portland cement. Grinding time (15, 30, 45 min), impeller speed (250, 500, 750 rpm), and mixed ratio (6.7, 8.4, 11.l, 20.9) were three operating factors examined for the performance of a wet-type stirred ball mill grinding system. For the operating conditions employed, mean diameter of fine ash powder, specific energy input, and grinding energy efficiency were in the range of $2.83{\sim}9.58{\mu}m,\;0.5{\sim}6.73kWh/kg,\;and\;0.51{\sim}3.27m^2/Wh$, respectively. With the wet-type stirred ball mill grinding system used in this study, the grinding energy efficiency decreased with the increase in total grinding time, impeller speed, and mixed ratio. The difference in specific surface area of powder linearly increased with logarithm in total number of impeller revolution and the grinding energy efficiency linearly decreased. Grinding time of 45 min, impeller speed of 500 rpm, and mixed ratio of 6.7 were chosen as the best operating condition. At this condition, mean particle diameter of the fine ash, grinding energy efficiency, grinding throughput, and specific energy input were $2.84{\mu}m,\;2.28m^2/Wh,\;0.17kg/h$, and 2.03kWh/kg, respectively. Wet fine grinding which generates no fly dust causing pollution and makes continuous operation easy, is appeared to be a promising solution to the automatization of rice husk ash grinding process.

Utilization of Paper Sludges for Developing Bed Soils and Seedling Pots (II) - Manufacture of artificial bed soils by optimum mixing of paper sludges and additives - (상토 및 육묘 포트의 개발을 위한 제지 슬러지의 이용 (제2보) - 제지 슬러지 및 첨가제의 최적 혼합을 통한 인공 상토 제조 -)

  • Kim, Chul-Hwan;Kim, Gyeong-Yun;Sin, Tae-Gi;Jung, Ho-Gyeong;Lee, Young-Min;Song, Dae-Bin;Huh, Moo-Ryong
    • Journal of Korea Technical Association of The Pulp and Paper Industry
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    • v.39 no.4
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    • pp.68-75
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    • 2007
  • In order to supplement insufficient nutrients of paper sludges, additional materials such as saw dust and rice husk were added during preparation of bed soils. Rice husk was more finely ground, compared to saw dust. The fine particles of the rice husk prevented their flow in a barrel of the expander. The mixed additives with paper sludges could be used to control the quantity of required nutrients for raising plants. That is, except for potassium and manganese, most of nutrients were decreased with adding the additives to paper sludge. The acidity of the paper sludges mixed with the saw dust or the rice husk was a little decreased with the increased amount of the additives. Differently from the bulk density of the paper sludges, the moisture content and the water absorption rate of the paper sludges were incremented with increasing the additives.

Cultivate Characterics of Chili Growth using Nutrient Solution in Articifial Soil (인공 토양에서의 양액을 이용한 고추의 재배 특성)

  • Yoon, Sang Jin;Sean, Keefe Dimas Harris;Kwon, Soon Hong;Chung, Sung Won;Kwon, Soon Goo;Park, Jong Min;Kim, Jong Soon;Choi, Won Sik
    • Journal of the Korean Society of Industry Convergence
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    • v.20 no.5
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    • pp.351-357
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    • 2017
  • Growing plant in potting media without soil is known as Soilless cultivation. This method is used mostly in greenhouse cultivation to increase horticultural commodities production. Peat moss is commonly utilized as potting media substrate because of its characteristic. However, peat moss price is high because of the quantity of peat moss in nature has been decreased. Recently, most of the research is conducted to find the alternative growing medium to cultivate horticulture plant in potting media. Perlite and rice husk ash were mentioned that had a potent as alternative growing media for seasonal plants to increase agriculture production due to the lack of production area. This study aimed to determine the effect of using different substrate and growth performance of chili. The method used was the soilless cultivation. The chili was planted in the pot with perlite media, rice husk ash media, and peat moss media. The chili was measured after 65 days after planting. The result showed that rice husk ash and perlite were more potentials in chili growth performance than peat moss. Rice husk ash had the significant result of plant height. While, Perlite effect on root length, plant weight, leaf length, and stem diameter. The best alternative for cultivation chili without substrate based on this research was perlite then rice husk ash and peat moss.

Durability Performance Evaluation On Early-Aged Concrete with Rice Husk Ash and Silica Fume (Rice Husk Ash와 실리카퓸을 혼입한 초기재령 콘크리트의 내구성능 평가)

  • Saraswathy, Velu;Kwon, Seung-Jun
    • Journal of the Korea Concrete Institute
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    • v.27 no.4
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    • pp.343-351
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    • 2015
  • Currently, lots of researches have been performed for reducing cement usages due to increasing social/engineering problems caused by $CO_2$ emission. Supplementary cement materials like fly ash, slag, and silca fume are usually employed for cement replacement, and nowadays rice husk ash (RHA) is widely studied for enhancement of concrete performance as mineral admixture. In this paper, concrete samples with RHA and SF which is known for its engineering advantages are prepared and a resistance to chloride attack is evaluated in early-aged concrete. For the work, replacement ratios of 10~30% for RHA concrete and 2~8% for SF concrete are considered, and various durability tests such as density, void, sorptivity, current measurement, and chloride diffusion coefficient are performed including mechanical test like compressive and tensile strength. Replacement of RHA 10~15% shows better improvement of corrosion resistance and strength than that of SF 2~4% and normal concrete, which shows a strong applicability for utilization as construction materials.

High-Grade Characteristics of Solid Refuse using Food Waste Fermentation Product (음식물류 폐기물 분해산물 활용 고형연료 고품위화)

  • Jeong, Cheol Jin;Park, Seyong;Song, Hyoungwoon
    • Journal of Korean Society of Environmental Engineers
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    • v.40 no.9
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    • pp.372-377
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    • 2018
  • In this study, the value of solid refuse fuel was evaluated by using fermentation products generated after processing food wastes with high moisture content by using bio-dying process, and the characteristics of solid refuse fuel production for high-grade production were obtained and analyzed. The highest quality was obtained at 10% rice husk mixing ratio and 5% rice straw mixing ratio, and average density of mixed pellets was $605kg/m^3$. It was concluded that 25% of moisture content of mixed pellets was optimum. As a result of thermogravimetric analysis, rice straw, rice husks and fermentation product were first pyrolyzed. In the order of rice husk mixing ratio 5%, rice straw mixing ratio 10%, rice straw mixing ratio 5% and rice husk mixing ratio 10% proceeded slowly. It was indirectly confirmed that rice straw was slowly pyrolyzed at mixing ratio of 5% and pellet compacting power was the highest. Rice straw was optimal condition for mixing ratio of 5% As a result of comparison between rice husk and rice straw of this study show that rice husk was optimal condition at mixing ratio of 10%. The average higher heating value of pellets was 3,870 kcal/kg, which was 5% higher than that of fermentation products and was more than 3,500 kcal/kg.

The applicability of Freundlichs isotherm model for the leaching of solidified hazardous waste using cementitious binders

  • Jong Ho Youn;Heo
    • Journal of Environmental Science International
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    • v.2 no.1
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    • pp.9.2-19
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    • 1993
  • A laboratory study was conducted to investigate the immobilization of the laboratory waste sludge, mainly from chemical oxygen demand (COD) waste, using cementitious binders. The binders were: Ordinary Portland Cement (OPC), and lime-Rice Husk Ash (RHA) cement. The economic evaluation was done for three different kinds of cementitious binders, namely, OPC, Portaind Rice Husk Ash Cement (PRHAC) which contained rice husk ash U percent by dry weight, and lime-RHA cement. The result showed that lime-RHA cement was the cheapest. The applicability of Freundlich's desorption isotherm was studied to assess the teachability of sludges. The teachability of cement mortars was found to follow the desorption isotherms. Therefore, it was concluded that based on this test, the leachate concentrations of the solidified heavy metals could be predicted, approximately by the Freundlich's isotherm desorption modeling.

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The Influence of Firing Conditions on the Color Properties of Pr-ZrSiO4 Pigments Synthesized Using Rice Husk Ash

  • Pyon, Kyu-Ri;Lee, Byung-Ha
    • Journal of the Korean Ceramic Society
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    • v.46 no.4
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    • pp.397-404
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    • 2009
  • Using rice husk ash as silica, the influence of the firing temperature and holding time on the color intensity of Pr-$ZrSiO_4$ pigments were investigated. The Pr-yellow pigments were calcined at 500, 700, 800, 900, 950, 1000, $1100^{\circ}C$ in a ceramic method. The synthesized pigments were characterized by DT-TG thermal analysis, X-ray diffraction, UV-Vis spectroscopy, and SEMEDAX analysis. The relationship between the zircon phase-formation growth and Pr-yellow color development was evaluated and the optimum firing conditions were determined. The color of the pigment samples was characterized on the grounds of the Commission Internationale de l'Eclairage (CIE) standard procedure (CIE $L^*a^*b^*$ measurement) after an application on the bisque ceramic tile.

Microalgal Culture Conditions for Utilization of Flue Gas from Rice Husk Incinerator (왕겨 소각로 배연가스 이용을 위한 미세죠류 배양 조건 확립)

  • 박승제;조성호;이진석;정용섭
    • Journal of Biosystems Engineering
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    • v.24 no.1
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    • pp.9-18
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    • 1999
  • This study was performed to investigate the optimum microalgal culture conditions using flask culture and to find the feasibility of using the flue gas of the rice husk incinerator for cultivating the microalgae. The optimum initial pH of media was 4.5 for the microalgae culture, and the intermittently illuminated culture was more effective than the continuous illuminated culture. Thus, the balance between photosynthesis and formative metabolism must be considered thoroughly to cultivate microalgal cells. The optimum CO2 concentrations were in the range of 7 to 10%, and the optimum temperature was about 35$^{\circ}C$ in both the daytime and the nighttime for the culture. When flue gas of the rice husk incinerator was applied to the microalgae culture using stirred photobioreactor, the dry cell weight was 0.026 g dry biomass/hr$.$l. The results obtained in experiments indicated that the flue gas was effective for microalgae culture without any limitations.

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