• Title, Summary, Keyword: 응집제

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Influence of Flocculants During Vacuum Dewatering of Radioactive Slurry Waste (방사성 슬러리 폐액의 탈수에서 응집제 효과)

  • 정경환;이동규;정기정
    • Journal of Energy Engineering
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    • v.10 no.2
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    • pp.114-119
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    • 2001
  • TRIGA Mark-II&III 연구로서의 운영과정에서 발생된 방사성 슬러리 함유 폐액에 대하여 음이온, 앙이온, 그리고 비이온 응집제를 첨가하였을 때의 여과 효과를 실험실 규모의 진공여과 장치로 연구하였다. 여과 실험 자료를 이용하여 Darcy’s Law에서 유도된 여과 케익 저항 값을 산출하였다. 응집제 사용으로 응집제를 사용하지 않은 경우롸 비교하여 케익 저항값의 개선은 있었지만, 수분함량은 증가하였다. 각각의 응집제 사용에 따른 침전율, 여과 케익의 수분함량, 그리고 여과 케익 저항 값을 비교한 결과 음이온 응집제 12~16ppm/$\ell$ waste를 사용하였을 경우가 가장 효과적인 것으로 나타났다.

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Development of Coagulants and Application in Field (국내 수질에 맞는 응집제 개발 및 현장적용)

  • 곽종운;김용태;김봉준;김철웅
    • Environmental engineer
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    • pp.71-76
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    • 2001
  • 본 연구과제는 기존의 응집제에 비하여 우수한 신규 응집제를 개발하는 것으로 목표로 추진했다. 그간의 연구에서 기존의 응집제에 비하여 탁월한 응집성능을 발휘하는 고염기도(70$\%$)응집제인 Ca-PAX를 개발하였다. Ca-PAX는 탁도 제거에서 기존의 PAC에 비하여 70$\%$ 이하의 투입량으로도 동일한 처리결과를 보이며, 유기물 제거에서도 탁월한 성능을 보였다. 또한 적은 투입량으로도 우수한 처리성능을 보이기

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Alum$\cdot$철염 응집제의 응집효과 비교

  • 안현화;황병기;이상호
    • Proceedings of the Korean Environmental Sciences Society Conference
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    • pp.126-127
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    • 2000
  • Fe(III) 응집제는 pH 5~9범위에서 Al(III)계 응집제보다 보다 우수한 응집효과를 보였으며 또한 pH의 영향을 거의 받지 않는 것으로 나타났다. 잔류 Fe의 경우 응집제 주입농도와 pH 증가에 영향을 거의 받지 않고 저농도의 잔류 Fe농도를 나타낸 반면, Al(III) 응집제는 잔류 Al의 급격한 증가를 나타내었다.

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The Effects of Fe-coagulants in Real Textile Wastewater Treatment Process (염색폐수처리 공정에서 Fe 성분 응집제의 효능)

  • Hong, Young-Ho
    • Proceedings of the KAIS Fall Conference
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    • pp.655-658
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    • 2009
  • 본 연구는 철 성분 응집제가 염색폐수 처리공정에서 슬러지 발생에 미치는 영향에 대한 연구로 응집제로 $FeCl_3$, $FeSO_4$, $Al_2(SO_4)_3$를 사용하였다. 본 연구의 목적은 염색폐수처리공정에서 발생되는 폐수를 응집제를 이용하여 처리할 때 부수적으로 발생되는 슬러지의 양을 감량하며, 응집제가 색도제거에 미치는 영향에 대한 상관성을 규명 하는데 그 목적이 있다. 실험에 사용된 염색폐수의 BOD, COD, pH, 그리고 색도의 평균값은 각각 800 mg/L, 600 mg/L, 9.7, 102 이었다.

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Effect of re-based Coagulants on Cell Separation Efficiency from the Culture Broth of Alcaligenes eutrophus. (Alcaligenes eutrophus의 배양액으로부터 균체 분리 효율에 미치는 철(Fe)계 응집제의 효과)

  • 류희욱;조경숙;곽종운;장용근
    • Microbiology and Biotechnology Letters
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    • v.26 no.3
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    • pp.257-263
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    • 1998
  • Alcaligenes eutrophus was successfully recovered from high cell density broth by pre-treatment with Fe-based coagulants. An inorganic coagulant, Fe$_2$(SO$_4$)$_3$, and a polymerized coagulant, Ferix-3, were used. Good coagulation was observed in broad pH range of 3 to 13, the floe size was increased with increasing pH of culture broth. The optimum pH of fermentation broth for cell recovery was 10 to 13. The optimum coagulant dosages to recover cells with 95% cell recovery were increased with increasing cell concentration. Optimal coagulant dosage was lower when the polymerized coagulant was used rather than the inorganic coagulant. The coexistence of NH$_4$$\^$+/ was increased coagulant requirement, and the coagulant requirement was 0.066g Fe$_3$$\^$+//g NH$_4$$\^$+/.

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A Study on Solid-liquid Separation of Swine Wastewater Using Coagulation and Dissolved Air Flotation (응집침전 및 부상분리에 의한 돈사폐수의 고액분리에 관한 연구)

  • Kim, Jong-Oh;Jeong, Seong-Uk
    • Journal of the Korea Organic Resources Recycling Association
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    • v.12 no.2
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    • pp.101-109
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    • 2004
  • In this study, the solid-liquid separation characteristics of swine wastewater were investigated for the coagulation and dissolved air flotation (DAF). Coagulation characteristics were studied using jar-tester with the different coagulants and dosage amounts. DAF characteristics were also investigated in terms of the different flotation conditions with the raw swine wastewater, pH adjustment only, and adding coagulants. When the raw swine wastewater was coagulated with the only inorganic coagulants, the proper inorganic coagulants were founded as $FeCl_3$ > PAC > Alum orderly, and the optimal coagulant dosages were founded as $1,000mg/{\ell}$, $1,500mg/{\ell}$, $1,500mg/{\ell}$, respectively. As the raw swine wastewater was treated with the polymer coagulants, the only cationic polymer coagulant showed an effective coagulation and the optimal dosage of cationic coagulant was founded as $200mg/{\ell}$. When the different dosages of cationic polymer was added to each $500mg/{\ell}$ of the inorganic coagulants, the proper inorganic coagulants were founded as $FeCl_3$ > Alum > PAC orderly, and optimal cationic polymer dosages was founded as $25mg/{\ell}$, $25mg/{\ell}$, and $100mg/{\ell}$, respectively. Resulting from the raw swine wastewater experiments using DAF without coagulation, the proper operation conditions of DAF were set to 400% of recycling ratio, 4 atm in air dissolving tank, and under pH 3. But the raw swine wastewater was difficult to successfully operate DAF without pre-coagulation. While the DAF separation after pre-coagulation using inorganic coagulants was not accomplished due to the low intensity of the floc, DAF after pre-coagulation using both the inorganic and cationic polymer coagulants was accomplished very well. Optimal dosage of cationic polymer coagulant in case of $500mg/{\ell}$ Alum dosage was founded as $500mg/{\ell}$.

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CST를 적용한 하수슬러지 탈수특성에 관한 연구

  • Gu, Bong-Heon;Lee, Chang-Su;Jeon, Bong-Jun;Park, Seung-Cheol
    • Proceedings of the Korean Environmental Sciences Society Conference
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    • pp.356-359
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    • 2005
  • 하수를 처리하는 공정에서 해마다 슬러지의 발생량은 증가하고 있으며, 이를 효과적으로 처리하는 것이 매우 중요하다. 따라서, 본 연구는 경제적이면서도 측정이 간편한CST(Cap-illary Suction Time)을 통해 슬러지 의 탈수성 과 적 정 주입량을 산출하는 방법을 연구하였다. 이를 위하여 본 실험의 대상인 도시 하수슬러지에 대하여 함수율 및 pH변화, 무기 및 유기 응집제의 주입량 변화, 그리고 응집제 투입 후 침전된 응집제량을 조사하여 탈수성을 조사하였다. 슬러지의 함수율을 97%, 98%, 99%로 했을 때, CST는 99%일 때가 가장 적은 값으로 나타났다 응집제 주입 후 침전된 슬러지의 생성량은 응집제가 증가됨에 따라 증가하다가, 최적 주입량보다 더 많은 응집제를 주입할 경우에는 그 양이 감소했다. 이는 형성된 응집물의 구조적 특성의 변화를 나타내고 있음을 알 수 있다. 위와 같은 실험 결과를 통해 CST는 수분이내(< Smin)에 슬러지의 탈수성을 신속하게 측정할 수 있는 방법이며 비교적 정확하게 측정할 수 있음을 알 수 있다. 뿐만 아니라 응집제의 최적 주입량 및 응집물의 구조적 특성을 평가하는 데에도 유용하게 사용할 수 있다.

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Isolation and Characterization of Bioflocculant Producing Strain YG-02 (생물응집제를 생산하는 Strain YG-02의 분리 및 특성)

  • Jung, Yeongon;Ko, Joonil;Chung, Seonyong
    • Journal of the Korean Society of Urban Environment
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    • v.18 no.3
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    • pp.251-260
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    • 2018
  • In this study, we researched the characteristics of germs that produce a bioflocculant, which is harmless and has a high flocculating activity used for the purpose of application to water treatment and other industrial processes that could replace chemical flocculants currently in use, through isolation and identification. Also, in order to increase the flocculant output and flocculation efficiency, we investigated the optimized culture conditions and environments such as flocculant optimal dose, pH condition, temperature condition, and et cetera. As a result, by conducting separation of the flocculant producing new microorganisms and identification through 16S rRNA sequencing, it exhibited 97% homology with Delftia acidovorans strain NBRC 14950, and thus we named it strain YG-02. Strain YG-02 grew most optimally in pH 7.0 range and $22^{\circ}C$ and the maximum flocculating rate of strain YG-02 that grew in the optimal condition turned out to be 92.73%. As a result of this study, we discovered a new microorganism that produces a bioflocculant and a possibility of replacing chemical flocculants.

Determination of Optimum Dosage of Polymer by Zeta potential in the Wastewater Treatment (수처리 시 Zeta전위 측정에 의한 응집제 주입량 결정)

  • Cho, Jun-Hyung;Kang, Mee-Ran
    • Journal of Forest and Environmental Science
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    • v.22 no.1
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    • pp.27-31
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    • 2006
  • Sedimentation characteristics such as SS, COD removal efficiency of wastewater in the toilet paper mill using recycled paper were examined by zeta potential. Optimum dosage of coagulant were determined by turbidity, SS, COD and then equation for treatment efficiency was suggested. Mechanical strength of floc was determined by turbidity.

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Recovery of Poly(3-hydroxybutyrate) from the Coagulated Cells of Alcaligenes eutrophus. (응집 처리한 Alcaligenes eutrophus 균체로부터 poly(3-hydroxybutyrate)의 회수)

  • 조경숙;홍은화;류희욱;장용근
    • Microbiology and Biotechnology Letters
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    • v.26 no.3
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    • pp.206-212
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    • 1998
  • The effects of the pretreatment with coagulants on the recovery efficiency of poly (3-hydroxybutyrate, PHB) synthesized in Alcaligenes eutrophus were investigated. Al-base or Fe-base coagulants, and the dispersion method of 30% hypochlorite solution and chloroform were used as coagulants and PHB recovery method, respectively The recovery efficiency of PHB from the cells harvested with Al-base coagulants at the range from 0 to 1000 mg-Al/L was similar to that from cells harvested without the coagulants. At these conditions, the concentrations of residual aluminium in the purified PHB were below 250 mg-Al/kg-PHB, indicating the effect of residual aluminum on the characteristics of the purified PHB can be insignificant. When the dosage of coagulants was over 1000 mg-Al/L, the PHB recovery remarkably decreased with increasing the coagulant dosage. However, the PHB recovery could be enhanced by the use of 50% hypochlorite solution instead of 30% hypochlorite solution. Even though the reduction of PHB recovery efficiency was not found by using Fe-base coagulants, the purified PHB was stained pale red due to residual iron, These results suggest that the use of Al-base coagulants did not exert bad influence on neither PHB recovery efficiency and PHB purity.

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