• Title/Summary/Keyword: deodorization efficiency

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Development of Silent Discharge Chamber with Al2O3 Dielectric Pellet to Improve Ozone Generation Characteristics (오존발생특성 향상을 위한 강유전성 알루미나 무성방전관의 개발)

  • Kwak, Dong-Joo
    • Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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    • v.20 no.7
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    • pp.58-64
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    • 2006
  • Recently deep interests have been paid on the effective generation of ozone, which has been widely used for water treatment, deodorization, color removal, and chemical processing of exhausted smoke. The silent discharge reaction has been proposed as the most effective one in the many ozone generation methods, because the silent discharge can be generated under the conditions of lower applied voltage and power consumption, compared other ones. In this paper, in order to improve the ozone generation and ozone generation efficiency, the conventional silent discharge chamber with $Al_2O_3$ dielectric layer and tubular ferroelectric bed discharge reactor packed with $Al_2O_3$ pellets were made, and the silent discharge of the reactors were studied experimentally. The ozone generation characteristics are also discussed based on the discharge characteristics, especially on the wall charge accumulation properties and power consumption. The results show that the electric charges of discharge tube with bead are around 2.5 times as large as those without bead. In the discharge chamber packed with dielectric beads, the ozone concentration and the energy yield characteristics were also improved, compared with those in the conventional silent discharge reactor.

Study on Consumer Awareness for the Development of Personal Protective Equipment for Hog Raisers (양돈작업자의 개인보호구 개발을 위한 소비자 인식조사)

  • Hwang, Young-Mi;Kim, Kyung-Ran;Lee, Kyung-Suk;Chae, Hye-Seon
    • Journal of Environmental Health Sciences
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    • v.39 no.6
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    • pp.522-531
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    • 2013
  • Objectives: A field survey was conducted in a hog-raising industry in order to help develop personal protective equipment for workers which would secure the safety and the health of these workers. The attempt by this study will help enhance safety in the livestock industry and contribute to the advancement of the industry. Method: The study first selected a total of 111 workers from the hog-raising industry as research participants and designed a survey with questions on general characteristics, indoor and outdoor working environments, how the workers would in practice wear or purchase the working clothes, what needs to be improved in these new working clothes, how much the workers would be likely to accept the working clothes and protective equipment, and lastly, conditions of the communicable disease control overgarment. The collected data underwent frequency analysis and cross analysis with SPSS 21.0. Result: The research targets' average age was 50 years. Work efficiency by environmental factor was normal, but all age groups had experience of accidents (79.3%). Major wounded parts were under elbow and under knee. Protective equipment most commonly worn was helmet (83.4%), gloves (98.2%) and boots (99.1%), and satisfaction with them was normal at 3.41. Working clothing most commonly worn was old clothing (31.8%) and everyday wear (17.6%) and satisfaction with it was low. Considering the improvement of working clothing, they required attached pouches, elasticity and deodorization. The acceptability of improved working clothing was high at 69.2%. Conclusion: After problems have been addressed in relevant future research, what has been learned from the concerned study will be referred to as a useful basic reference when the relevant field works to develop high-quality working clothing and protective equipment for workers in the hog-raising industry.

Efficiency Investigation of Vanishing Composting Machine Using Exhaust gas Recirculation system (배기가스순환시스템을 적용한 소멸 퇴비화장치의 효율검토)

  • Phae, Chae-Gun;Kim, Jong-Chan
    • Journal of the Korea Organic Resources Recycling Association
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    • v.7 no.2
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    • pp.93-104
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    • 1999
  • Existing composting system was improved to have a high performance for organic degradation, deodorization and energy reduction. Compared with conventional devices, this developed system uses the heat recovered from platinum catalytic tower by three times heat exchange in which 65% of exhaust gas was recirculated. Evaporation of water was made easy by maintaining negative pressure in entire system. It was possible for reaction to be maintained steadily by microorganism agent. The optimum mixing volume ratio of garbage to sawdust was 15:1 contrary to 20:1 in conventional one. Moreover, aerobic condition was maintained efficiently. Effects obtained by using a inner circulation system were as follows. It was possible to reduce the ammonia causing offensive odor and verified that consumption of electricity cut down to 1/3 with reduction of exhaust gas inflowing. According to this inner circulation, the optimum air flow was $0.44m^3$ to 100kg treatment capacity. The electricity consumption was changed in proportion to inflowing air volume.

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Isolation and Identification of a Lactic Acid Bacterial Strain KJ-108 and Its Capability for Deodorizing Malodorous Gases Under Anaerobic Culture Conditions

  • KIM, JEONG-DONG;JUNG-HOON YOON;YONG-HA PARK;DAE-WEON LEE;KYOU-SEUNG LEE;CHANG-HYUN CHOI;WON-YEOP PARK;KOOK-HEE KANG
    • Journal of Microbiology and Biotechnology
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    • v.13 no.2
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    • pp.207-216
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    • 2003
  • A number of different sources, such as composts, leachates, and pig feces samples, were collected from different pig farms in Korea, and several microorganisms were screened for their ability to deodorize the malodorous gases. Consequently, a novel malodorous gases-deodorizing bacterial strain, KJ-108. was isolated, because it was highly abundant in nitrate-supplemented minimal medium ($MM-NO_3^-$) under anaerobic culture conditions. Airtight crimp-sealed serum bottles containing $MM-NO_3^-$ , medium were inoculated with KJ-108. Nitrate concentration was decreased rapidly after 20 h of incubation, and incubation was carried out until nitrite production reached almost zero. Taxonomic identification, including 16S rDNA base sequencing and phylogenetic analysis, indicated that the isolate had $100\%$ homology in its 165 rDNA base sequence with Lactobacillus pentosus. Among the volatile fatty acids, acetic acid contained in large amounts in fresh piggery slurry was decreased by about $40\%$ after 50 h incubation with strain KJ-108. n-Butyric acid, n-valeric acid, and isovaleric acid were gradually decreased, and isobutyric acid and capronic acid were dramatically eliminated at theinitial period with the treatment. Moreover, NH, removal efficiency reached a maximum of $98.5\%$ after 50 h of incubation, but the concentration of $H_2S$ was not changed.

A Study on Combined Processes of Sliding Arc Plasma and Corona Dielectric Barrier Discharge for Improve the Efficiency Treatment of Harmful Substance (슬라이딩아크 방전과 코로나 방전의 복합공정을 통한 유해물질 처리효율 개선에 관한 연구)

  • Kwon, Woo-Taeg;Lee, Woo-Sik
    • Fire Science and Engineering
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    • v.28 no.6
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    • pp.108-113
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    • 2014
  • The combined process of Sliding Arc Plasma and corona dielectric barrier discharge process (CDBD) was used to efficiently improve harmful substance, which convert into OH radicals which have strong oxidation potential, and so have deodorization and sterilizing effects, by generating specific radicals and anion and then reacting with the moisture contained in harmful substance. As a result of experiment, even if the size of SAP reactor is reduced from 80 A to 50 A, there is no much change and therefore it is judged the size of reactor may be minimized. And it was confirmed that after the anion and ozone generated from CDBD rector react with harmful substance, a anion was reduced from 510,000 ppb to 470 ppb and ozone from 98 ppb to 22 ppb. It was also judged the stability and durability of plasma producer are excellent. Accordingly, it is considered the harmful substances which exist in indoor air quality will be efficiently improved and removed by using further plasma combined process through this study.

Properties and Industrial Applications of Seaweed Polysaccharides-degrading Enzymes from the Marine Microorganisms (해양 미생물 유래 해조 다당류 분해 효소의 특성 및 산업적 응용)

  • Kim, Jeong-Hwan;Kim, Yeon-Hee;Kim, Sung-Koo;Kim, Byung-Woo;Nam, Soo-Wan
    • Microbiology and Biotechnology Letters
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    • v.39 no.3
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    • pp.189-199
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    • 2011
  • Recently seaweed polysaccharides have been extensively studied due to their various biological functions including antitumor, antiviral, anticoagulant, and anti-inflammatory activities. Although seaweed polysaccharides are known to possess numerous beneficial properties, their industrial applications have been limited due to the low inclusion efficiency and high cost of manufacturing involved in chemical hydrolysis. In addition, the smell of seaweed has been a limiting factor in its application in the food and cosmetic industries. Therefore, novel hydrolysis methods and the deodorization of seaweed are required if the extensive application of seaweed polysaccharides is to be seen. A number of studies have examined various seaweed polysaccharide-degrading enzymes, which have been isolated from marine microorganisms, and enzymatic hydrolysis processes have been investigated for the improvement of production yields and the bioefficacy of seaweed polysaccharides. This review is a synopsis on the properties of seaweed polysaccharides-degrading enzymes from marine microorganisms and their industrial applications. The review reveals the pressing need for more concentrated research on the development of new biological materials from seaweed.

The Effects of the Fermentation Broth of Fruits and Vegetables on Antimicrobial Activity and Egg Quality with its Supplementation in Feed (과채발효액의 항균 및 탈취력 효과와 사료 첨가시 계란 품질에 미치는 영향)

  • So, Kwang-Seob;Park, Young-Ho;Joung, II-Yong;Ko, Byoung-Seob;Hong, Sang-Mee;Park, Sun-Min
    • Journal of Applied Biological Chemistry
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    • v.52 no.2
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    • pp.77-83
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    • 2009
  • This study was conducted to investigate the effect of the fermentation broth of fruits and vegetables and various kinds of lactobacillus containing in the broth on anti-microbial activity, anti-acidity, its organic acid concentrations and deorderization. In addition, the quality of eggs laid from the hens supplemented with the fermentation broth was determined. The fermentation broth contained over 8 kinds of lactobacillus and other microbes. Lactobacillus (L.) hilgardii, L. reuteri, L. nagelii, L. plantarum, and Zygosaccharomyces bisporus were survived especially in pH 2.0 among them. The concentrations of acetic acid and lactic acid in the broth were higher than minimum inhibitory concentration values (MIC) to Escherichia (E.) coli and Salmonella sp. Overall the broth contained sufficient organic acid to inhibit the growth of E. coli and Salmonella sp. In addition, L. nagelii and L. plantarum had the greatest anti-microbial activity against E. coli, Salmonella (S.) typhimurium, Staphylococcus aureus and S. gallinarium among lactobacillus in the broth. The broth had greater anti-microbial activity than individual lactobacillus. The fermentation broth had deodorization capacity of ammonia and hydrogen sulfate and the 50% of their concentrations were removed after 30 min treatment. Egg production rates, egg weight, and feed efficiency were increased in eggs laid from hens that supplemented with 0.1 % fermented broth compared to the control. The supplementation also increased the thickness and strength of egg shell to reduce broken eggs and decreased cholesterol levels in egg yolk. In conclusion, the fermentation broth of fruits and vegetables can be a natural alternative supplementation of feed in laying hens.

Effect of Biofilter Made of Composted Pine Tree Bark and Perils on Reducing Odor from Pig House (부숙수피-펄라이트 혼합충전재의 돈사악취 제거 효과)

  • Lee, Seung-Joo;Chang, Dong-Il;Chang, Hong-Hee
    • Korean Journal of Environmental Agriculture
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    • v.25 no.2
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    • pp.118-123
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    • 2006
  • To remove effectively order component ($NH_3\;and\;H_2S$) from pig house, biofilter was made of composted pine tree bark and polite and odor removal efficiency was evaluated in the lab and pilot scales. The columns were designed with ${\Phi}120mm{\times}450mm$ (H) and ${\Phi}850mm{\times}900mm$ (H) in the size in the lab and pilot scale testes, respectively. Single material of composted pine tree bark and polite and the mixture of two materials with 7:3 ratios (vol/vol) were packed in the column, and, herein air flow was controlled upward direction from column bottom. To enhance the efficiency of biofilter, ammonia (Rhodococcus equi A3) and hydrogen sulfide oxidizing bacteria (Alcaligenes sp. S5-5.2) were inoculated in packing materials before the test Removal effect of ammonia and hydrogen sulfide gases were higher in the mixture$[88.7{\sim}98.2%,\;89.5{\sim}97.9%]$ than that in single packing material (composted pine tree haft$[89.4{\sim}98.7%,\;78.7{\sim}85.6%]$ and petite$[65.3{\sim}73.2%,\;88.7{\sim}98.2%]$ by the lab scale biofilter. In the modeled pig house, about 96 and 91% of ammonia and hydrogen sulfide gases were removed by the pilot scale of biofilter, respectively. Conclusively, composted pine tree bark and polite could be a good candidate of biofilter packing materials to remove the odor components.