• Title, Summary, Keyword: Bentonite

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Study on the Adsorptivity of Korean Bentonite Premixed with Salts (염을 혼합한 국산 Bentonite의 흡착능에 관하여)

  • Myun Sup Kim
    • Journal of the Korean Chemical Society
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    • v.17 no.1
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    • pp.53-59
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    • 1973
  • The adsorptivity of Methylene Blue on Korean Yeongil bentonite which was premixed with a salt of KF or $NH_{4}Cl$ etc., treated at $200-500^{\circ}C$, washed and dried, was studied. In case of treatment with$NH_{4}Cl$, slight improvement of the adsorptivity of methylene blue on the products was observed. With KF, treated at$200-300^{\circ}C$, the best results was obtained. The adsorption capacity of the products was improved about 1.7 times than that of original bentonite. With $FeSO_4$ or $Na_{2}CO_3$ etc. improvement of the adsorption capacity on the products was not observed.

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Viability test hydrocarbon-degrading bacterium by carriers according to temperature conditions

  • 박진희;김영식;여인봉;박기영
    • Proceedings of the Korean Society of Soil and Groundwater Environment Conference
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    • pp.203-208
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    • 2002
  • 미생물 생산은 다양한 산업에 이용되는 핵심산업이다. 그러나 미생물을 장기간 보존하거나 생산 후 현장처리에 상황에 있어 미생물의 활성이 환경 및 각종조건에 따라 장기간 유지되지 못하는 경향이 있다. 따라서, 본 실험에서는 Pseudomonas putida SSEoX의 생산 후 시중에서 판매되는 perlite, diatomite, bentonite, zeolite, dolomite, vermicullite 등의 담체를 이용하여 미생물의 생리활성유지를 위한 실험을 자연현상에서 나타날 수 있는 다양한 온도에서 담체의 종류별로 수행하였다. 그 결과 bentonite를 이용한 담체의 경우 5, 20, 3$0^{\circ}C$에서 40일간 미생물의 밀도가 거의 감소하지 않은 결과로 나타났고 zeolite의 경우 20일 이내의 저온에서 생존율이 높은 것으로 나타났으나 온도의 상승으로 생존율이 현저히 떨어졌다. 또한 Dololite의 경우 초기 20일 내에서는 20t에서 생존율이 매우 높았으나 40일 후 생존율이 현저히 감소하였다. 또한 bentonite의 경우 전체적으로 생존율이 거의 감소되지 않았으며 그중 5$^{\circ}C$와 2$0^{\circ}C$에서 생존율이 가장 높았고 3$0^{\circ}C$에서 30일 후까지는 비교적 적은 감소를 보였으며 40일 이후 비교적 큰 감소율이 있었다. 따라서, 본 실험결과 비교적 낮은 온도에서 bentonite와 vermiculite를 혼합한 담체를 이용한 미생물보존이 가장 우수만 생존유지법이었다.

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A Study on the Purification Chara00cteristics of Bentonite with Dry-Based Process (벤토나이트광의 건식 정제 특성 연구)

  • 정수복;김완태;채영배;임정한
    • Journal of the Mineralogical Society of Korea
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    • v.15 no.4
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    • pp.283-291
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    • 2002
  • Dry-based processes such as crushing, milling, sieving, magnetic and gravity separation were employed in order to investigate the purification characteristics of bentonite. The CECs of Gampo 13 and 35 bentonites were estimated at 88.3 and 93.3 meq/100 g and the samples contained quartz and feldspar as impurity minerals. According to the physical properties of constituent minerals of bentonite, the purification techniques were adopted to enhance the grade of montmorillonite High grade of montmorillonite could be obtained by the combination of each process. Consequently, the recovery of final products of Gampo 13 and 35 bentonite were 68.6 and 49.5%, and the CECs of them were 96.9 and 109.6 meq/100 g, respectively.

Permeation Characteristics of the Submerged Membrane Module Using the Rotating Disks (회전원판을 이용한 침지형 분리막 모듈의 투과특성)

  • Chung Kun-Yong;Cho Young-Su;Kim Jong-Pyo
    • Membrane Journal
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    • v.16 no.1
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    • pp.51-58
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    • 2006
  • The permeation experiments were carried out for the submerged membrane module equipped with self-designed rotating disks in order to determine the effect of fouling reduction and the optimum operating conditions as a function of operating time. Kaolin and bentonite particles were used to prepare various concentrations of feed solution. Every experiment was continued until 60 minutes at various rotating disk speeds up to 120 rpm. The suction pressure for kaolin solutions decreased to 28% by using rotating disk to decrease the fouling. Also, the optimum permeation flux decreased as kaolin concentration increased, and became 60 to 70 LMH for 0.4 wt% of kaolin solution. The suction pressure for bentonite experiment approached to 0 mmHg at 30 LMH and above 80 rpm rotating disk speed.

Thinning Effect Due to Bentonite Migration on Performance of GCL (벤토나이트 유실로 인한 협착이 GCL 거동에 미치는 영향)

  • Choi, Hangseok;Lee, Chulho;Stark, Timothy D.
    • Journal of the Korean Geosynthetics Society
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    • v.5 no.4
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    • pp.49-58
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    • 2006
  • Recently, geosynthetic clay liners (GCLs) have increasingly been used to replace compacted clay liners (CCLs) in composite liner systems. Since the introduction of GCLs to waste containment facilities, one of the major concerns about their use has been the hydraulic equivalency to CCLs as required by regulations. Laboratory test results and more recently field observations show that the thickness, or mass per unit area, of hydrated bentonite in a GCL can decrease under normal stress, especially around zones of stress concentration or nonuniform stresses, such as a rock or roughness in the subgrade, a leachate sump, or wrinkles in an overlying geomembrane. This paper presents field case histories that confirm the laboratory observations of bentonite migration and the effect of bentonite migration on hydraulic equivalency and contaminant transport through a GCL.

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A Study of the Bottom Ash as Environmentally Grouting Materials (Bottom Ash를 이용한 그라우팅재의 환경적 연구)

  • Doh, Young-Gon;Kwon, Hyuk-Doo;Lee, Song
    • Journal of the Korean Geotechnical Society
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    • v.22 no.11
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    • pp.5-11
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    • 2006
  • The purpose of this study was to examine the proper mixing ratio of ordinary portland cement and Bottom Ash to recycle the Bottom Ash, which is an industrial waste. After the evaluation, the compressive strength and durability were assessed using the mixture of completely weathered soil (Hwangto), weathered granite soil, and Bentonite. Then environmental friendliness of this mixed material was examined through heavy metal leaching method. It was found out that proper mixing ratio is 6:4, and that the 6% mixture quantity of completely weathered soil (Hwangto), weathered granite soil, and Bentonite is the most effective for compressive strength and durability It was also found out through heavy metal leaching method that the Bottom Ash could be below the standard of the Clean Water Law.

Study on physical characteristic of Graphite-added grout for backfilling cloed-loop groud heat exchanger (흑연(Graphite) 첨가를 통한 수직 밀폐형 지중열교환기 뒤채움재의 열전도 특성 향상 연구)

  • Lee, Kang-Ja;Gil, Hu-Jeong;Lee, Chul-Ho;Choi, Hang-Seok;Choi, Hyo-Pum
    • 한국신재생에너지학회:학술대회논문집
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    • pp.579-582
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    • 2009
  • The thermal conductivity and viscosity(or workability) of graphite-added bentonite grouts and cementitious grouts have been evaluated and compared to determine the suitability of these materials for backfilling vertical boreholes of ground heat exchangers. Seven bentonite grouts from different product sources and a portland cement grout with various mixture ratios were considered in this paper. As a new additive for grout, we choose graphite which has high thermal conductivity. The bentonite grouts indicate that the thermal conductivity and viscosity increase with the content of bentonite or with an addition of Graphite compared with that of silica sand. In case of cementitious grout also increase the thermal conductivity and decrease the workability dramatically though an addition of Graphite. Therefore, we cautiously select the amount of graphite and mixture ratio of bentonite and cement considering not only thermal conductivity but also viscosity for the optimum condition of backfilling material.

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Controllability of White Pitch and Compatibility of Micropolymer on PEO/Cofactor Retention System and PAM/Bentonite Retention System (PEO/cofactor 보류 시스템과 PAM/bentonite 보류 시스템에서의 micropolymer 상용성과 백색 점착성 이물질 제어 효과)

  • Jung, Chul-Hun;Lee, Jin-Ho;Park, Jong-Moon
    • Journal of Korea Technical Association of The Pulp and Paper Industry
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    • v.44 no.6
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    • pp.43-49
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    • 2012
  • In this work, the non-ionic polyethylene oxide(PEO)/phenolic formaldehyde resin(PFR) retention system, which was less affected by furnish charge, was analyzed for possibility and effectiveness when using recycled stock. When the micropolymer was added at the PEO/PFR retention system and the PAM/bentonite retention system, performance of retention and drainage was improved. When the cationic micropolymer was added on the PEO/PFR retention system, the highest retention was achieved. The Polyacrylamide(PAM)/bentonite system induced flocculation of white pitch by electrostatic flocculation. On the other hand, the non-ionic PEO/PFR retention system induced less flocculation of white pitch than the PAM/bentonite retention system.

The Strength Properties of Cement-Bentonite Soil Mixtures with Geosynthetics and Metakaolin (토목섬유 및 메타카올린 첨가 시멘트-벤토나이트 혼합토의 강도 특성)

  • Lee, Jae-Deuk;Yeon, Kyu-Seok;Kim, Kwang-Woo;Kim, Yong Seong
    • Journal of The Korean Society of Agricultural Engineers
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    • v.54 no.6
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    • pp.159-167
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    • 2012
  • In the present study, an investigation has been made on the application of cement-bentonite soil mixtures as the countermeasure against leachate produced by buried animal carcasses. For this purpose, the strength characteristics of the cement-bentonite soil mixtures mixed with geotextile and metakaolin. After the mixtures with different contents of the cement (0 %, 10 %), bentonite (0 %, 5 %, 10 %, 15 %, 20 %), and weathered soil (100 %, 95 %, 90 %, 85 %, 80 %) were prepared, metakaolin and geotextile were added with different contents (metakaolin : 0 %, 5 %, 10 %, 15 %, 20 % of the cement weight; geotextile : 0 %, 0.5 %, 1 %, 1.5 %, 2 %). Experimental results suggested that the early strength of the mixture increases due to the pore filling, the hydration acceleration, and the pozzolan reaction when metakaolin of 5~10 % of the cement weight was added. In addition, the compressive strength increase when 0.5~1 % geotextile contents were added, and the above these contents, the rate of strength increase was gradually decreased because of the fibrous tangles.

A Study on the Chemical Characteristics for the Leachate of Open(Illegal) Dumping Waste Landfill Mixing with Bentonite (벤토나이트 첨가시 불량폐기물매립지의 침출수에 미치는 화학적 특성에 관한 연구)

  • 이재영;노회정
    • Journal of Korea Soil Environment Society
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    • v.4 no.1
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    • pp.75-83
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    • 1999
  • The purpose of this study is to investigate the chemical characteristics of the leachate for the open(illegal) dumping waste. In this study, the open dumping waste were mixed with 0, 5, 10, 15% of bentonite in each Iysimeter as a rate of weight. The simulation was evaluated by CODcr, ${NO_3}^-$, ${SO_4}^{2-}$, $Cl^-$ and heavy metals in leachate. As a result, the mixed waste with bentonite in all Iysimeters showed the reduction of CODcr and heavy metals were hardly detected. The removal rate of ${NO_3}^-$, ${SO_4}^{2-}$, $Cl^-$ was increased with the mixing rate of bentonite.

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