• Title, Summary, Keyword: rice husk

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Effect of Expanded Rice Husk Medium on Rice Seedling for Machine Transplanting

  • Ko Jonghan;Kim Doo Yeol;Sa Jong Gu;Lee Byun Woo;Lee Youn Su
    • KOREAN JOURNAL OF CROP SCIENCE
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    • v.50 no.1
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    • pp.55-59
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    • 2005
  • Rice farmers can save labor and expenses by using expanded rice husk (ERH) as a seedling medium since ERH is lighter and cheaper than other commercial seedling media (CSM). This study was carried out to develop a method for rice seedling cultivation using ERH as a seedling medium. It is suggested that a mixture of $60\%$ of ERH and $40\%$ of a CSM could be used as a seedling medium; the planting densities would be 240g per tray for infant seedlings and 200 g for young seedlings; and nitrogen (N) would be applied at a rate of 1g per tray for infant seedlings prior to planting and 2g per tray for young seedlings with division. Great care should be taken to use $CO(NH_2)_2$ as an N-source fertilizer. These results would lay a foundation for the rice seedling cultivation with ERH as a medium.

Evaluating germination of lettuce and soluble organic carbon leachability in upland sandy loam soil applied with rice husk and food waste biochar (왕겨 바이오차 및 음식물쓰레기 바이오차가 밭 사양토에서 상추발아 및 수용성 유기탄소 용출에 미치는 영향 평가)

  • Han, Kyung-Hwa;Zhang, Yong-Seon;Jung, Kang-Ho;Cho, Hee-Rae;Sonn, Yeon-Kyu
    • Korean Journal of Agricultural Science
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    • v.41 no.4
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    • pp.369-377
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    • 2014
  • This study was carried out to evaluate the effect of rice husk (RHB) and food waste biochar (FWB) on upland soil with sandy loam texture, in terms of physico-chemical analysis, lettuce seed germination test, and orgainc carbon leaching experiment. RHB and FWB had different physico-chemical properties each other. Carbon to nitrogen ratio (C/N ratio) of RHB was 32, showing two times higher than that of FWB. FWB had high salt and heavy metal content, compared to RHB. This is probably due to different ingredients and production processing between two biochars each other. Results of germination test with Lettuce showed lower germination rate when FWB was applied because of higher salt concentration compared to control and RHB. Organic carbon leaching test using saturated soil column (${\Phi}75{\times}h75mm$) with $10MT\;ha^{-1}$ biochar application rate, showed higher saturated hydraulic conductivity in rice husk biochar treatment column, compared to control and food waste biochar treatment. The highest total organic carbon concentration in column effluent was lower than those in both of rice husk biochar and food waste biochar, whereas the differences was negligible after 9 pore volumes of effluent. Consequently, biochars from byproducts such as rice husk and food waste in sandy loam textured upland soil could enhance a buffer function such as reduction of leaching from soil, but the harmful ingredient to crops such as high salt and heavy metals could limit the agricultural use of biochars.

Studies on the Utilization of Exothermic Heat Composting during Winter Season (동계(冬季) 퇴비부숙열(堆肥腐熟熱) 이용(利用)에 관(關)한 연구(硏究))

  • Kim, Sung-Pil;Park, Young-Dae;Joo, Young-Hee;Uhm, Dae-Ik
    • Korean Journal of Soil Science and Fertilizer
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    • v.17 no.3
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    • pp.283-288
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    • 1984
  • This study was conducted to evaluate the characteristics of exothermic heat and compost generated from decomposition of organic wastes composts were piled up with various sources of raw materials of rice straw, rice husk, human and animal wastes. The duration of generated exothermic heat during compositing process was longer in mixture piles of rice straw/rice husk ratio of 1:1 compared to rice straw alone. Temperature in compost piles added with phosphate as fused superphosphate fertilizer was rapidly increased at the earlier stage of composting and gradually decreased in 30 days compared to the check. pH of compost showed 5.5 at initial piling, however, its peak appeared 8.8 in 10 days with rapidly increasing temperature of compost and maintained around 8.3 after one month. Compost of mixture of rice straw and chicken droppings maintained temperature ranges of 30 to $65^{\circ}C$ for 39 days, compost of rice straw, rice husk and chicken droppings for 69 days, piles of rice straw, rice husk and hog manure for 56 days, mixture of rice straw, rice husk and cow manure for 66 days and compost of rice straw, rice husk and human wastes for 21 days.

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Effects of Green Manure and Carbonized Rice Husk on Soil Properties and Rice Growth (녹비작물 혼파 이용 벼 재배 시 왕겨숯 처리가 벼 생육 및 토양 특성에 미치는 영향)

  • Jeon, Weon-Tai;Seong, Ki-Yeong;Lee, Jong-Ki;Oh, In-Seok;Lee, Young-Han;Ok, Yong-Sik
    • Korean Journal of Soil Science and Fertilizer
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    • v.43 no.4
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    • pp.484-489
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    • 2010
  • The cultivation of green manure crops plays an important role in soil quality and sustainability of agricultural system. However, the incorporation of green manure crops may be of concern because it can lead to strongly reducing conditions in the submerged soil. This study was conducted to evaluate the effects of rice husk carbon on rice (Oryza sativa L.) cultivation using green manure mixtures (hairy vetch + rye) in rice paddy. Field experiments were conducted in rice paddy soil (Shinheung series, fine loamy, mixed, nonacid, mesic family of Aeric Fluventic Haplaquepts) at the National Institute of Crop Science (NICS), Korea from October 2007 to October 2008. The experiments consisted of three treatments: application or no application of carbonized rice husk, and conventional fertilization. These treatments were subdivided into whole incorporation and aboveground removal of green manure mixtures. The redox potential (Eh) was higher upon application of the carbonized rice husk when compared to no application at 8 and 37 days after transplanting (DAT). The ammonium-N ($NH_4$-N) in soil was highest upon the application of carbonized rice husk + whole green manure incorporation at 17 and 49 DAT. Plant height and tiller number of rice were similar to the $NH_4$-N concentration in soil. Rice yields of application and no application of carbonized rice husk treatment were not significant. However, application of carbonized rice husk improved the soil physical properties such as bulk density and porosity after rice harvest. Therefore, the results of this study suggest that carbonized rice husk could be used as soil amendment for environmentally-friendly rice production under a green manure mixture-rice cropping system.

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

  • 박승제;최연규;김명호;이종호
    • Journal of Biosystems Engineering
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    • v.25 no.1
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    • pp.39-46
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    • 2000
  • This work was conducted to study the operating characteristics of a grinding system designed to obtain fine rice husk ash powder. To find better utilizing of rice husk, a valuable by-product from rice production, once the rice husk was incinerated 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 manufacturing . The rice husk ash grinding system consisted of a high speed centrifugal fan for the preliminary coarse milling and a dry-type stirred ball mill for the subsequent fine grinding . Total grinding time 9 5, 15, 30, 45 min), impeller speed (250, 500, 750 rpm) , and mixed ratio (4.8, 7.9, 14.9) were three operating factors examined for the performance of a stirred ball mill used for the fine grinding of ash. With the stirred ball mill used in this study, the minimum attianable mean diameter of rice husk ash powder appeared to be 2 ${\mu}{\textrm}{m}$. During the find grinding, the difference in specific surface area of powder showed an increase and the grinding energy efficiency decreased with the increase in total grinding time, impeller speed ,and mixed ratio. For the operating conditions employed , the resulting mean diameter of fine ash powder, specific energy input, and grinding energy efficiency were in the range of 1.79 --16.04${\mu}{\textrm}{m}$, 0.072-5.226kWh/kg, an d1.11-12.15$m^2$/Wh, respectively. Grinding time of 30 min , impeller speed of 750 rpm, and mixed ratio of 4.8 were chosen as the best operating conditions of the stirred ball mill for fine grinding . At these conditions, mean particle diameter of the fine ash, grinding energy efficiency, grinding throughtput, and specific energy input were 2.73${\mu}{\textrm}{m}$, 3.95$m^2$/Wh, 0.25kg/h, and 1.22kWh/kg, respectively.

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Fabrication and property of silica nanospheres via rice-husk (왕겨를 통한 실리카 나노스페어의 제작과 특성)

  • Im, Yu-Bin;Kwk, Do-Hwan;Wahab, Rizwan;Lee, Hyun-Choel;Kim, Young-Soon;Yang, O-Bong;Shin, Hyung-Shik
    • 한국신재생에너지학회:학술대회논문집
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    • pp.619-619
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    • 2009
  • Recently, silica nanostructures are widely used in various applicationary areas such as chemical sensors, biosensors, nano-fillers, markers, catalysts, and as a substrate for quantum dots etc, because of their excellent physical, chemical and optical properties. Additionally, these days, semiconductor silica and silicon with high purity is a key challenge because of their metallurgical grade silicon (MG-Si) exhibit purity of about 99% produced by an arc discharge method with high cast. Tremendous efforts are being paid towards this direction to reduce the cast of high purity silicon for generation of photovoltaic power as a solar cell. In this direction, which contains a small amount of impurities, which can be further purified by acid leaching process. In this regard, initially the low cast rice-husk was cultivated from local rice field and washed well with high purity distilled water and were treated with acid leaching process (1:10 HCl and $H_2O$) to remove the atmospheric dirt and impurity. The acid treated rice-husk was again washed with distilled water and dried in an oven at $60^{\circ}C$. The dried rice-husk was further annealed at different temperatures (620 and $900^{\circ}C$) for the formation of silica nanospheres. The confirmation of silica was observed by the X-ray diffraction pattern and X-ray photoelectron spectroscopy. The morphology of obtained nanostructures were analyzed via Field-emission scanning electron microscope(FE-SEM) and Transmission electron microscopy(TEM) and it reveals that the size of each nanosphares is about 50-60nm. Using the Inductively coupled plasma mass spectrometry(ICP-MS), Silica was analyzed for the amount of impurities.

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Effect of Manufacturing Factors on Mechanical Properties of the Rice-husk Powder Composites (왕겨분말 복합재료의 기계적 특성에 미치는 제조인자의 영향)

  • Choi J.Y.;Wang Renliang;Yoon H.C.;Lim J.K.
    • Transactions of the Korean Society of Mechanical Engineers A
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    • v.30 no.7
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    • pp.794-799
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    • 2006
  • In recent years, the use of natural fiber as reinforcement in polymer composites to replace synthetic fiber such as glass fiber is receiving increasing attention. Because of increasing usage according to the high demand, the cost of thermoplastic has increased rapidly over the past decades. We used a thermoplastic polymer(polypropylene) as the matrix and a lignocellulosic material(rice-husk flour) as the reinforcement filler to prepare a particle-reinforced composite to examine the possibility of using lignocellulosic material as reinforcement filler and to determine data of test results for physical, mechanical and morphological properties of the composite according to the reinforcement filler content in respect to thermoplastic polymer, In this study, PLA/PP rice-husk fiber-reinforced thermoplastic composites that made by the hot press molding method according to appropriate manufacturing process was evaluated as mechanical properties.

The Comparison Study on Reburning Effects of LNG and Rice Husk in Heavy Oil Flamed Furnace (중유 화염 연소로에서 LNG와 왕겨분말의 재연소 효과 비교)

  • Shin, Myeung-Chul;Kim, Se-Won;Lee, Chang-Yeop
    • Journal of the Korean Society of Combustion
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    • v.14 no.4
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    • pp.25-32
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    • 2009
  • In commercial combustion systems, heavy oil is one of main hydrocarbon fuel because of its economical efficiency. Regarding heavy oil combustion, due to increasing concerns over environmental pollutants such as carbon monoxide, unburned hydrocarbon and nitrogen oxides, development of low pollutant emission methods has become an imminent issue for practical application to numerous combustion devices. Also a great amount of effort has been tried to developed effective methods for practical using of biomass. It is also an important issue to reduce carbon tax. In this paper, an experimental study has been conducted to evaluate the effect of biomass reburning on NOx formation in a heavy oil flamed combustion furnace. Experiments were performed in flames stabilized by a multi-staged burner, which was mounted at the front of the furnace. Experimental tests were conducted using air-carried rice husk powder and LNG as the reburn fuel and heavy oil as the main fuel. The paper reports data on flue gas emissions and temperature distribution in the furnace for several kinds of experimental conditions. NOx concentration in the exhaust has decreased considerably due to effect of reburning. The maximum NOx reduction rate was 62% when the rice husk was used by reburn fuel, however it was 59% when the LNG was used by reburn fuel. The result shows the positive possibility of biomass reburning system for optimal NOx reduction.

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Application of Fuller's ideal curve and error function to making high performance concrete using rice husk ash

  • Hwang, Chao-Lung;Bui, Le Anh-Tuan;Chen, Chun-Tsun
    • Computers and Concrete
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    • v.10 no.6
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    • pp.631-647
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    • 2012
  • This paper focuses on the application of Fuller's ideal gradation curve to theoretically design blended ratio of all solid materials of high performance concrete (HPC), with the aid of error function, and then to study the effect of rice husk ash (RHA) on the performance of HPC. The residual RHA, generated when burning rice husk pellets at temperatures varying from 600 to $800^{\circ}C$, was collected at steam boilers in Vietnam. The properties of fresh and hardened concrete are reviewed. It is possible to obtain the RHA concrete with comparable or better properties than those of the specimen without RHA with lower cement consumption. High flowing concrete designed by the proposed method was obtained without bleeding or segregation. The application of the proposed method for HPC can save over 50% of the consumption of cement and limit the use of water. Its strength efficiency of cement in HPC is 1.4-1.9 times higher than that of the traditional method. Local standards of durability were satisfied at the age of 91 days both by concrete resistivity and ultrasonic pulse velocity.

Growth Performance of Chinese Cabbage using Soilless Cultivation Method

  • Keefe, Dimas Harris Sean;Yoon, Sangjin;Kwon, Soonhong;Kwon, Soongu;Park, Jongmin;Kim, Jongsoon;Chung, Songwon;Choi, Wonsik
    • Journal of the Korean Society of Industry Convergence
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    • v.22 no.1
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    • pp.55-60
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    • 2019
  • 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 research aims to determine the growth of in rice husk ash, perlite and peat moss as growing substrates. The method used was the soilless cultivation. The chinese cabbage was planted in the pot with perlite media, rice husk ash media, and peat moss media. The chinese cabbage was measured after 35 days after planting. The result showed that peatmoss was more potentials in chinese cabbage growth performance than rice husk ash and perlite. Peat moss had the significant result of every research parameters such as plant height, plant weight, number of leaves, plant diameter, root length, and root weight. The best alternative for cultivation chinese cabbage without substrate based on this research was peat moss then rice husk ash and perlite.