• Title/Summary/Keyword: 분말활성탄 흡착

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Evaluation of the adsorptive capacity of spent coffee powder for the removal of aqueous organic pollutants (액상 유기오염물질에 대한 폐커피가루의 흡착능력 평가)

  • Kim, Seulgi;Na, Seungmin;Son, Younggyu
    • Journal of Wetlands Research
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    • v.18 no.1
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    • pp.39-44
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    • 2016
  • The reuse of spent coffee powder has been researched for environmental engineering applications such as adsorbents of organic/inorganic pollutants. In this study adsorption equilibrium tests and adsorption kinetics tests for the removal of aqueous organic pollutant (methylene blue) were conducted using spent coffee powder, granular activated carbon, and powdered activated carbon. It was found that the maximum adsorption capacity of three adsorbents followed the order of powdered activated carbon (178.6 mg/g) > spent coffee powder (60.6 mg/g) > granular activated carbon (15.6 mg/g). The results of adsorption kinetics tests also indicated that spent coffee powder had higher kinetic parameters than granular activated carbon for pseudo 1st and 2nd order kinetics. The high performance of spent coffee powder might be due to its porous surface like those of granular and powdered activated carbons and smaller particle size comparing with granular activated carbon.

유가금속 회수공정 폐액중 셀레늄 제거에 관한 연구

  • Han, Sang-Uk;Lee, Hak-Seong
    • Proceedings of the Korean Environmental Sciences Society Conference
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    • 2008.11a
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    • pp.495-498
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    • 2008
  • 여러 가지 흡착제를 사용한 회분식 흡착성능 측정 실험에서 흡착성능은 음이온교환수지 > 입상활성탄 > Biomass > 분말활성탄 > 제올라이트 순으로 나타났으며, 모든 흡착제는 30분 안에 흡착평형 상태에 도달 하였다. 음이온교환수지를 이용한 회분식 흡착실험에서 최대흡착량은 pH 10에서 0.0483 mmol/g로 가장 높았고, 대체적으로 pH가 높은 범위에서 흡착이 잘 되는 것으로 밝혀졌다. 이것은 산화물 상태의 셀레늄이 pH 6 이하의 영역에서는 HSeO$_3^{-}$가 존재하며, PH 6$\sim$10 영역에서는 HSeO$_3^{-}$와 SeO$_3^{-2}$가 공존하며, pH 10 이상에서는 SeO$_3^{-2}$만 존재함을 알 수 있는데, 실험에서도 유사한 결과가 나온 것으로 사료된다. 입상활성탄을 이용한 흡착실험에서 최대흡착량은 pH 4.5에서 0.0574 mmol/g으로 가장 높았다. pH 4.5$\sim$6.5 범위에서는 대체적으로 비슷한 성능을 나타내었다. 입상활성탄의 표면전위 특성상 음이온으로 존재하는 셀레늄과 정전기적 반발력으로 인해 흡착이 거의 일어나지 않는 것으로 보이지만, 음이온 상태로 존재하는 셀레늄 이외의 금속간 화합물이나 물리적인 결합상태의 미세입자들이 흡착된 것으로 보인다.

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A Study on Removal of Dissolved Organic Matter and Phosphorus in Eutrophic Lake by Coagulation Process Using Powdered Activated Carbon (분말활성탄 응집침전 공정을 이용한 부영양화 호소수의 용존 유기물 및 인의 제거 연구)

  • Cho, Kyung Chul;Lee, Min Hee;Park, Jung Hwan;Jung, Jongtai
    • Journal of Wetlands Research
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    • v.14 no.4
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    • pp.629-635
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    • 2012
  • This study was conducted to evaluate the removal behaviors of DOM(dissolved organic matter) and phosphorus in eutrophic lake water by coagulation process with PAC(powdered activated carbon). It was observed that the removal characteristic of soluble matter was different from that of dissolved one, and the removal of DOM was effected by both pH and coagulant dosage. It was founded that PAC could increase the removal efficiency by an adsorption of DOM in coagulation process. A formation of soluble and colloidal matters resulted in the degradation of phosphorus removal efficiency in a chemical precipitation process. The phosphorus removal efficiency could be enhanced by an absorption of colloidal matter and dissolved complex with PAC addition. In addition, the PAC addition caused the increase of floc density in coagulation process, that led to the rise of sedimentation rate, and resulted in a significant improvement of solid-liquid separation efficiency.

A Study on the Removal of Phenol by Hybrid Process coupling adsorption with microfiltration (흡착과 정밀여과의 혼성공정에 의한 페놀 제거에 관한 연구)

  • ;;Fane, A. G.
    • Membrane Journal
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    • v.6 no.2
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    • pp.109-116
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    • 1996
  • This work is a fundamental study for applying hybrid process coupling adsorption with microfiltration to waste-water treatment. Phenol was separated by adsorption on powdered activated carbon, adsorbed phenol with activated carbon was separated by microfiltration. As the particle size in suspension increased, filtration resistance decreased, and effect of particle concentration on resistance was less pronounced. The rate of uptake was greatly dependent on the degree of phenol loading. For a smaller amounts of activated carbon, the change of permeate concentration before break point and phenol loading with time were steeper than in the case of large amounts. Permeate concentration before break point decreased with decreasing particle size, this could be due to the increase of outer surface of particle and film mass transfer coefficient.

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Removal of Ammonia in Water using Acid-impregnated Activated Carbon and Dynamic Membrane System (산 첨착활성탄과 동적막 공정을 이용한 수중 암모니아 제거)

  • Choi, Won Kyung;Shin, Dong-Ho;Lee, Yong Taek
    • Applied Chemistry for Engineering
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    • v.17 no.3
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    • pp.310-316
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    • 2006
  • In this study, activated carbon in a powder form was used to remove dissolved ammonia which causes a fouling smell in water. Since the adsorption capacity of common powder activated carbon is not high enough, we prepared powder activated carbon deposited on an acid solution to enhance the adsorption capacity. The acid-impregnated activated carbon was applied on the surface of porous fibril support ($10{\sim}50{\mu}m$) by which adsorption and separation processes take place simultaneously by varying effective pressure. As the result, the ammonia removal efficiency is above 60% in the mixing process which is 10~15% higher than general powder activated carbon. From the result of an experiment on the pure permeable test of a dynamic membrane, its transmittance is 400~700 LMH (liter per hour), indicating that the prepared membrane works as a microfiltration membrane. Therefore, it is expected that the membrane prepared in this way would improve the efficiency of water treatment than conventional membranes.

Manufacturing Tailored Powder Activated Carbon for Removing Perchlorate in Water (수중 과염소산염(Perchlorate) 제거를 위한 맞춤 분말활성탄 제조)

  • Kim, Sang-Goo;Song, Mi-Jeong;Choi, Keun-Joo;Ryu, Pyung-Jong;Kim, Shin-Chul;Lee, Yong-Doo
    • Journal of Korean Society of Environmental Engineers
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    • v.30 no.6
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    • pp.637-641
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    • 2008
  • The aims of this research were to manufacture tailored powder activated carbon having a higher prechlorate removal efficiency and to compare perchlorate removal efficiency with different carbon materials for applying to the drinking water treatment plant. Activated carbon pre-loaded with cetyltrimethylammonium chloride(CTAC) has been researched to be an effective adsorbent for removing perchlorate in the water. 10,000 mg/L tailored powder activated carbon were manufactured by mixing 5.0 g of powder activated carbon(PAC) into 500 mL of 5,000 mg/L CTAC solution. The tailored powder activated carbon had 10 times higher perchlorate removal efficiency than virgin powder activated carbon. The residual perchlorate gradually decreased with the first 15 minute contact time with the tailored powder activated carbon, however, the longer contact time did not affect perchlorate removal. Tailored powder activated carbon by manufactured with 1,083 mg/g iodine value carbon had almost 4 times higher perchlarate removal efficiency than the 944 mg/g iodine value carbon. Dosage of 5 mg/L tailored powder activated carbon, which can adaptable dosage at the treatment plant, could decrease the perchlorate concentration from 50 $\mu$g/L to 15 $\mu$g/L.

Detection of Extremely Low Concentration Compound and Adsorption by Activated Carbon (극미량 농도 물질의 측정 및 활성탄 흡착 처리)

  • Lee, Sung-Bum;Yoon, Yeo-Min;Choi, Chang-Kyoo;Jung, Jin-Wook;Lee, Yong-Woo;Park, Se-Yong;Kim, Moon-Il
    • Journal of Korean Society of Environmental Engineers
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    • v.30 no.9
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    • pp.913-917
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    • 2008
  • Since the difficulty of analysis at low concentration and the uncertainty of the removal mechanism for Nitrosodimethylamine (NDMA) have been reported, this study has detected extremely low concentration $^{14}$C-NDMA using the LSC(Liquid Scintillation Counter) and tested NDMA removal by Powdered Activated Carbon(PAC). The results showed the highest correlation over 99% when samples were measured with the mixture ratio of sample to scintillation liquid of 10 : 10 and at the detection time of 10 min. For $^{14}$C-NDMA removal by the PACs(S-A(Sigma-Aldrich co.) and Dj(Daejung co.)) raging from 50$\sim$10,000 mg/L, $^{14}$C-NDMA was removed over 90% by adsorption treatment. In addition, S-A showed twice greater adsorption capacity than that of Dj. However, the required PAC amount for $^{14}$C-NDMA removal was higher than that of other amine compounds.

Removal of Geosmin and 2-methylisoborneol in Drinking Water by Powdered Activated Carbon (분말 활성탄에 의한 먹는 물 내의 이취미 물질 제거)

  • Chae, A Na;Shin, Jae Won;Cho, Kang Woo;Lee, Byung Chan;Song, Kyung Guen
    • KSCE Journal of Civil and Environmental Engineering Research
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    • v.37 no.2
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    • pp.475-483
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    • 2017
  • Geosmin and 2-methylisoborneol (2-MIB) produced by cyanobacteria during algal blooming in surface water are the major taste-and-odor-causing compounds in drinking water and need to be removed. Activated carbon is often used in treatment plants for the mitigation of odor problem. However, there is a lack of information on the effect of pore size distribution and particle size of activated carbon for adsorption of both odor compounds. Therefore, we studied the effect of pore size distribution and particle size of activated carbon on the adsorption of geosmin and 2-MIB. When comparing the adsorption of geosmin and 2-MIB between activated carbon fiber (ACF), powdered activated carbon (PAC) and granular activated carbon (GAC), the order of removal efficiency was PAC > ACF > GAC. As a result of comparing PACs with various pore distribution characteristics, well-developed micropores on activated carbon were found to be favorable for adsorption of geosmin and 2-MIB. For particle size, smaller was more effective for adsorption of geosmin and 2-MIB.

부상공정과 PAC-MF에 의한 수용액으로부터 색 제거

  • Kim, Seon-Il
    • 한국생물공학회:학술대회논문집
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    • 2002.04a
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    • pp.435-438
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    • 2002
  • The permeate flux was lower when PAC was added compared to without PAC system. It can be concluded that PAC is cause of membrane fouling. The effect of flow volume was found not significant for the three samples. But it was shown high rejection rate due to adsorption of organic matter to PAC in the case of adding PAC.

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