• Title/Summary/Keyword: natural purification

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Mineralogical Analysis and Mechano-Chemical Purification of Natural Silica Ore for High Purity Silica Powder

  • Park, Jesik;Lee, Churl Kyoung;Lee, Hyun-Kwon
    • Korean Journal of Materials Research
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    • v.26 no.6
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    • pp.306-310
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    • 2016
  • To produce 4N grade high-purity silica powder from natural ore, the mineralogical characteristics of natural silica ore were investigated and their effects on the purification process were revealed. The Chinese silica mineral ore used was composed of iron and aluminum as main impurities and calcium, magnesium, potassium, sodium, and titanium as trace impurities; these trace impurities generally exist as either single oxides or complex oxides. It was confirmed that liberation and acidic washing of the impurities were highly dependent on the particle size of the ground silica ore and on its mineralogical characteristics such as the distribution and phases of existing impurities. It is suggested that appropriate size reduction of silica ore should be realized for optimized purification according to the origin of the natural silica ore. A single step purification process, the mechano-chemical washing (MCW) process, was proposed and verified in comparison with the conventional multi step washing process.

Odor Reduction Technology in Sewage Treatment Facility Using Biofilter with Reed Grass(Phragmites australls) (갈대(Phragmites australls)수초를 적용한 바이오필터에서의 하수처리시설 악취저감기술)

  • Chung, Jin-Do;Kim, Kyu-Yeol
    • Journal of Korean Society of Water and Wastewater
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    • v.27 no.3
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    • pp.373-382
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    • 2013
  • In this study, a biological odor treatment system was proposed to remove odor(foul smell) materials causing several problems in the closed sewage treatment plant. This odor treatment system was composed of a two-step biofilter system in one reactor. The two-step biofilter reactor was constructed with natural purification layer in upper part and artificial purification layer in lower part. The reed grasses of water purification plants were planted in the surface area and mixed porous ceramic media were filled with the lower part of biofilter reactor. By using the above experimental apparatus, the ammonia gas removal efficiency was attained to 98.3 % and the hydrogen sulfide gas removal efficiency was appeared more than 97.7 % which shows more effective than the conventional odor removal process.

Emission characteristics of Natural Gas Fueled Vehicl and its Purification Technologies (천연가스 자동차의 Emission 배출특성 및 저감법)

  • 최병철;이지연;손건석;이귀영
    • Transactions of the Korean Society of Automotive Engineers
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    • v.5 no.2
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    • pp.127-135
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    • 1997
  • Experiments have been conducted to investigate emission characteristics of compressed natural gas fueled vehicle(CNGV) by the FTP 75 mode test. Its purification technologies were also investigated. It was found that CNGV was operated on the rich A/F condition by comparison with gasoline vehicle. The Pd catalyst was higher in methane purification performance than Pt and Pd/Pt/Rh catalysts. Up to 60% portion of the accumulative HC emissions(that contains above 80% methane) form CNGV occurs during the first phase of the FTP 75 mode. CO that is exhausted at rich conditions of the air-fuel ratio more than lean conditions should be used for the catalytic reduction of NOX, because the methane is not the effective reduction for NOX in the CNGV with 3-way catalyst system.

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Effectiveness of elimination inflowing algae in water treatment plant using natural algae remover (천연 조류 제거제를 이용한 정수장 유입 조류 제거 효율)

  • Jung, Hoyoung;Kim, Younghee
    • Journal of Korean Society of Water and Wastewater
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    • v.33 no.4
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    • pp.311-319
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    • 2019
  • The purpose of this study was to analyze water treatment characteristics, including the efficiency of removing algae from water purification plants, by installing a demonstration facility for decontamination of algae, including natural algae remover injection equipment, in the water purification plant. Jar-test showed that the optimum injection of natural decontaminant was 20 mg/L. Of the water contaminant treatment efficiency of the intake and water purification plants, Chl-a averaged 74.0% elimination efficiency from $5.0mg/m^3$ to $1.3mg/m^3$ and the maximum treatment efficiency was 91.5% removal efficiency when the inflow concentration of Chl-a was $11.8mg/m^3$. In addition, 51.2% and 47.1% of the taste and odor indicator items, geosmin and 2-MIB, resulted from the overgrowth and decaying of algae, respectively, to identify toxic substances and odor reduction effects. In addition, elimination efficiencies of SS and Turbidity materials were higher than 70.0%. In the injection of natural algae remover, no effects such as sudden changes in water quality due to secondary reactions were found, and appropriate levels were maintained under water treatment conditions.

Convergence Study on Organic Sludge Treatment System (유기성 슬러지 처리 시스템에 관한 융합연구)

  • Han, Doo-Hee
    • Journal of the Korea Convergence Society
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    • v.11 no.10
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    • pp.213-217
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    • 2020
  • An eco-friendly water purifier was developed using natural minerals, plants, and sludge from water purification plants. A wastewater complex treatment system using this water purification agent was developed. The wastewater complex treatment system goes through the process of inflow of contaminated water, input of water purification agent, operation of a pressurized flotation device, sludge flotation, sludge collection and treatment water discharge. This device was applied to the removal of green algae in livestock desorption liquid, broiler washing water, factory wastewater, sewage treatment plant and pond to obtain excellent removal rate. The use of natural water purification agents for organic waste purification has not been investigated.

Study on Natural Purification in the Midstream of Nakdong River (낙동강 중류부의 자정능력에 대한 연구 -용존산소를 중심으로-)

  • 이홍근;한진석
    • Water for future
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    • v.17 no.2
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    • pp.85-97
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    • 1984
  • Measuring the river flow and water quality in the midstream of the Nakdong River, the natural purification status in examined through the analyses of the elements which affect the variation of dissolved oxygen, and DO model is evaluated to the midstream reach of the river. The major results of this study are as follows; the pruification factor of the of the river is relatively high, it is worried over eutrophication considering much production of algae, and it is evaluated that important factor affecting the DO value computed by the proposed DO model are in order of reaeration coefficient, carbonaceous BOD and deoxygenation constant.

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Preliminary Experiment of Gravel Contact Oxidation Process in the Tropics

  • Abdullah Keizrul bin;Omachi Toshikatsu
    • Proceedings of the Korea Water Resources Association Conference
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    • 2006.05a
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    • pp.12-17
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    • 2006
  • Natural rivers have water purification functions called Gravel Contact Oxidation Process, which decontaminate river water by biological absorption, oxidation and degradation on riverbed gravels. This function has been developed and applied to many small/medium-sized urban rivers in Japan as one of the direct river water purification methods. However the method hasn't been verified in the tropics, which have different climate conditions and river characteristics. A preliminary experiment carried out at a polluted urban tributary in the outskirts of Kuala Lumpur, Malaysia where an increasing attention has been paid to river environment, showed a good applicability to the tropical conditions as a technically practical water purification measure with some maintenance cares for sludge management.

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