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Determining Method of Sulfites in Foods by Ion Chromatography

  • Kim, Myung-Hee;Chae, Young-Zoo
    • Journal of Food Hygiene and Safety
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    • v.3 no.4
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    • pp.211-215
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    • 1988
  • Anion chromatographic (lC) method was developed for the determination of sulfites infoods. Sulfites refer to sulfur dioxide that was separated from a food sample by addition of acid and heating, and carried into a trapping solution by distillation. The trapping solution was applied to IC system. Sulfites was separated on an anionic separator column, HPIC-AS4A with 0.75mM $NAHCO_3/2.25mM\;Na_2CO_3$ as the eluent and determined by the use of conductivity detector. The recoveries of sulfites added to water, carrot and apple at level of 1 ppm were 99.8%, 91.6% and 83.5%, respectively. The detection limit was 0.2 ppm in the case of a 10 g sample size. All experiment could be finished within 20 minutes

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Study on the Improvement Process for the Food Waste Resource Facility (II) - Focus on Deodorization Facility of DDM Environment Resource Center - (음식물류 폐기물 자원화시설의 공정개선에 관한 연구(II) - DDM환경자원센터의 탈취시설 사례를 중심으로 -)

  • Kim, Choong-Gon;Bae, Yoonhwan;SHIN, Hyun-Gon
    • Journal of the Korea Organic Resources Recycling Association
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    • v.27 no.1
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    • pp.33-38
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    • 2019
  • This study refers to the deodorization of DDM Environmental Resource Center, which is operating abnormally in the food waste public-resource facilities that are operating nationwide, in accordance with the initial operating conditions. Issues concerning the abnormal deodorization facilities of DDM Environment Resource Center were the deodorization of composting facilities, indoor air quality problems, and overall deodorization of facilities, especially the phenomenon of stopping while operating the RTO and the phenomenon of poor spray in the wet scrubber etc. As an alternative and improvement method for converting such abnormal operation facilities into normal operation facilities, It is proposed to remove the front filter of the upper part of the fermentation tank, and to install scrubbers, air and water separator, and roll filters for dust removal etc.

A Basic Study on the Mobile Separator and Sorter Development of Small and Medium-sized Discharge Site's Mixed Construction Waste in Rural Area (농촌지역 혼합건설폐기물의 중·소규모 배출현장용 이동식 분리선별기 개발을 위한 기초연구)

  • Kim, Byung-Yun;Park, Ji-Sun
    • Journal of the Korean Institute of Rural Architecture
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    • v.21 no.3
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    • pp.17-24
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    • 2019
  • This study aimed to develop a mobile separating and sorting device for discharge sites to separate and sort mixed construction waste generated in small and medium scale in small provincial cities into inorganic materials and combustible materials. The study results can be summarized as follows: 1) As a result of analyzing the existing domestic technology for the separating and sorting mixed construction waste, a device sorting the waste by fusing the vibration screen, disc screen, air blowing methods and the separating and sorting the combustible waste is applied in Korea. 2) In foreign countries, the air blowing, screen, gravity sorters are used for separating and sorting combustible waste in the same way as in Korea. Especially German T Company suggests a construction waste separating and sorting system using an optical sorter. 3) As for the test device for separating and sorting mixed construction waste to be buried in landfill, the processing capacity was set as 16 tons per day. 4) For separating and sorting inorganic materials by granularity, this study set a trommel with two types of diameter as a basic. To operate the mobile all-in-one system, the device is designed to locate a conveyor, a combustible waste conveying device, inside of the trommel. 5) The device is designed in a mobile mode under the concept of primary separating and sorting device, and it can be transported using a 2.5-ton truck minimum. The diameter and length of the trommel are designed to be within 1500mm and 3000mm, respectively. In a further study, an optimized separating and sorting technology is planned to be presented through an experimental study for processing efficiency analysis at the mixed construction waste site by manufacturing the pilot experiment facility reflecting the design elements in the result of this study.

Development of Oil-water Separator for the Effective Application of Highly Selective Membranes (고선택성 유수분리막 적용성 향상을 위한 유수분리장치 성능 개선 연구)

  • Choi, Kwang-Soon;Lee, Donghun;Uhm, Sunghyun
    • Applied Chemistry for Engineering
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    • v.30 no.1
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    • pp.39-42
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    • 2019
  • We report on the design of oil-water separators and the selection of materials for the effective application of highly selective membranes fabricated by commercial PET (polyester) fabrics. The waterproof ability of PET fabrics was optimized to improve the separation selectivity. The density of individual PET fabrics should be over $60g/m^2$, and the multi-layered structure is more favorable for the waterproof ability together with maintaining the removal efficiency. For the continuous adsorption and removal process, the rotating perforated cylinder was selected, and covered with membranes. Furthermore, more improved and stable removal efficiency was obtained by installing floating baffles which forces the oil content to move toward membranes.

Fabrication of Micro-Porous Membrane via a Solution Spreading Phase Inversion Method (용액 퍼짐 상분리법을 통한 마이크로 기공 분리막 제조)

  • Choi, Ook;Park, Chul Ho
    • Membrane Journal
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    • v.29 no.2
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    • pp.105-110
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    • 2019
  • Porous membranes are widely used in industry for removing particulate matter. Unlike conventional porous membrane fabrication methods, the solution spreading phase separation method can form pores very simply. The first step is to wet the mesh with the support layer, then to let the polysulfone solution flow into a solvent without water. The solvent is readily vaporized and the polysulfone is made into a thin film. When the polysulfone solution is mixed with water to form pores, the pore size can be adjusted according to the concentration ratio of the polysulfone solution. The thickness of the membrane is easily controlled by the concentration of the solution. The porous separator has the formation of meshes intact and is very useful for forming a three-dimensional structure. The solution spreading phase separation method proposed in this study is characterized by its high cost competitiveness compared with conventional membranes due to its low production cost and easy process control.

Preparation of an Anion Exchange Membrane Using the Blending Polymer of Poly(ether sulfone) (PES) and Poly(phenylene sulfide sulfone) (PPSS) (폴리에테르설폰-폴리페닐렌설파이드설폰 블렌딩 고분자를 이용한 음이온교환막의 제조)

  • Lee, Kyung-Han;Han, Joo-Young;Ryu, Cheol-Hwi;Hwang, Gab-Jin
    • Membrane Journal
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    • v.29 no.3
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    • pp.155-163
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    • 2019
  • The anion exchange membrane using the blending polymer of poly(ether sulfone) and poly(phenylene sulfide sulfone) was prepared. It was confirmed by EDXS and FT-IR analysis that the prepared anion exchange membrane had the -N- as an anion exchange group. The ionic conductivity in 1 mol/L $H_2SO_4$ aqueous solution was measured. The ionic conductivity of the prepared anion exchange membrane was 0.015~0.083 S/cm, and had a high value compared with AFN and APS as a commercial anion exchange membrane. Permeabilities of the vanadium ions through the prepared anion exchange membrane were tested to evaluate the possibility as a separator in vanadium redox flow battery. Vanadium ion permeation rate in the prepared anion exchange membrane had a low value compared with Nafion 117 as a commercial cation exchange and AFN as a commercial anion exchange membrane.

Surface Morphology Changes of Lithium/Sulfur Battery using Multi-walled carbon nanotube added Sulfur Electrode during Cyclings (탄소나노튜브가 첨가된 유황전극을 사용한 리튬/유황 전지의 사이클링에 의한 표면형상변화)

  • Park, Jin-Woo;Yu, Ji-Hyun;Kim, Ki-Won;Ryu, Ho-Suk;Ahn, Jou-Hyeon;Jin, Chang-Soo;Shin, Kyung-Hee;Kim, Young-Chul;Ahn, Hyo-Jun
    • Korean Journal of Metals and Materials
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    • v.49 no.2
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    • pp.174-179
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    • 2011
  • We investigated the surface morphology changes of a lithium/sulfur battery using multi-walled canbon nanotube added sulfur electrode during charge-discharge cycling. The Li/S cell showed the first discharge capacity of 1286 mAh/g-S, which utilized is 71% of the theoretical value. It decreased to 328 mAh/g-S at the 100th cycle, which corresponds to about 19% utilization of the total sulfur in the cathode. The spherical lumps of the reaction product were observed on the surface of the sulfur electrode. This material was verified as lithium sulfide by X-ray diffraction measurement. The pores in the separator were filled with reaction product. Thus the diffusion of the $Li^+$ ion decreased, which resulted in the decreased capacity of the Li/S cell.

The analysis of questionnaire survey to develop advanced fishing gear and to improve safe fishing procedure for offshore pot fishery (근해통발조업의 안전향상 및 어로장비 개발을 위한 요인분석)

  • AHN, Jong-Kap;JEONG, Geum-Cheol;PARK, You-Jin;AN, Young-Su
    • Journal of the Korean Society of Fisheries and Ocean Technology
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    • v.57 no.4
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    • pp.302-315
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    • 2021
  • In this study, factors such as improvement of a fishing process and safety, reduction of the labor force and headcount and development of the automation technology for offshore (eel and crab) pot fishing vessels were analyzed. A questionnaire survey was conducted to analyze and select the key factors using independent/paired sample t-test and correlation analysis, and a living lab was operated with ship owners, skippers and experts to discuss practical needs of the site. From the result of questionnaire survey and field requirements, it was possible to understand the level of awareness of ship safety, general safety equipment, fishing work process and fishing safety equipment from the point of view of the field. In addition, there were differences in the measurement results of each items because the working environment and experience were different according to the position of the ship owner and the skipper. The results of the questionnaire survey and various perceptions of field stakeholders were reflected when analyzing the fishing system and fishing process to choose the development equipment applicable to the field. From the analysis results, the selected development equipment based on the fishing equipment and process currently in operation are pot washing device, catch separation and fish hold injection device, length limit regulations and bait ejection device after use, automatic main line winding device, bait crusher, automatic (crab) pot hauling separator and so on.

Performance Analysis of Ammonia-Fed Solid Oxide Fuel Cell Using Alternating Flow (교류 흐름 방식을 적용한 암모니아 공급 고체산화물 연료전지의 성능 분석)

  • QUACH, THAI-QUYEN;GIAP, VAN-TIEN;LEE, DONG KEUN;LEE, SUNYOUP;BAE, YONGGYUN;AHN, KOOK YOUNG;KIM, YOUNG SANG
    • Journal of Hydrogen and New Energy
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    • v.33 no.5
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    • pp.557-565
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    • 2022
  • The effect of flow configuration in ammonia-fed solid oxide fuel cell are investigated by using a three-dimensional numerical model. Typical flow configurations including co-flow and counter-flow are considered. The ammonia is directly fed into the stack without any external reforming process, resulting in an internal decomposition of NH3 in the anode electrode of the stack. The result showed that temperature profile in the case of counter-flow is more uniform than the co-flow configuration. The counter-flow cell, the temperature is highest at the middle of the channel while in the case of co-flow, the temperature is continuously increased and reached maximum value at the outlet area. This leads to a higher averaged current density in counter-flow compared to that of co-flow, about 5%.

A study on structural analysis of GRINDING DISC ASS'Y for secondary battery material decompositiom (이차전지 원료 해쇄용 GRINDING DISC ASS'Y 구조해석에 대한 연구)

  • Yun, Dong-Min;Jeon, Yong-Han
    • Design & Manufacturing
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    • v.16 no.1
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    • pp.36-42
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    • 2022
  • Globally, as population growth and economic development continue, resource consumption is increasing rapidly. As an alternative to electric vehicles was suggested as the environmental pollution problem emerged, the number of registered electric vehicles in Korea increased by more than 137 times compared to 2013. Secondary batteries are expected to expand into various markets such as small IT devices and electric vehicles, and the most important part of electric vehicles is the battery (secondary battery). Therefore, in this study, to analyze the stability of the CSM (Classifier Separator Mill) grinding disc that crushes secondary battery raw materials, structural analysis and vibration analysis of the 1st to 4th grinding discs and the final model were performed. The change of bending by the weight of the Grinding Disc is at least 0.065㎛ and maximum 0.075㎛, and the change by the standard gravity is judged to be very low. The strain is at least 0.00031㎛/㎛ and maximum 0.00078㎛/㎛, and even if the number of Hamer increases, the change by the weight is judged to be insignificant. When the Grinding Disc rotates at a maximum of 6000rpm, the deformation and deformation rate of the first to third models are similar, but the fourth model (Hamer 10EA) is more than three times and the final model (Hamer 12EA) is about four times. However, the maximum deformation is 28.21㎛, which is considered to be insignificant when the change is 6000rpm. Six modes of natural Frequency analysis of the 1st~4th order and final model of the grinding disc appeared to be bent or twisted.