거품부상법을 이용한 코발트이온제거(I): 침전부상법

정인하; 박희성; 문제선; 임성팔; 배기광

Journal of the Korean Industrial and Engineering Chemistry, Vol.10, No.1, 41-45, February, 1999

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거품부상법을 이용한 코발트이온제거(I): 침전부상법

Removal of Cobalt ion by Foam Flotation(I): Precipitate Flotation

정인하, 박희성, 문제선, 임성팔, 배기광

초록

모의폐액으로 제조한 50ppm의 코발트이온을 sodium lauryl sulfate의 계면활성제를 사용하여 침전부상법으로 제거하였다. 침전부상으로 코발트 이온을 제거하기 전에 35% H₂O₂를 모의폐액에 첨가하여 폐액의 전처리 과정을 도입하였다. 그결과 최적 pH 및 처리후 잔존용액의 pH가 낮아졌고, 넓은 범위의 pH에서 높은 제거율을 나타내었다. 초기 코발트 이온농도, pH, 계면활성제 농도, 제거시간, 공급기체 유속, 외부이온 농도 등을 변수로 하여 실험한 결과, 초기 코발트 이온농도 50ppm, pH 9.5, 공급기체 유속 70mL/min, 제거시간 30분 등의 조건에서 99.8%의 제거율을 나타내었다. 침전물과 계면활성제의 흡착은 zeta potential 뿐만 아니라 침전물의 용해도 및 pH에 따라 변화하는 화학종과의 친화력과도 관계가 되는 것으로 추축되었다. 외부 이온으로서 NO₃^-, SO₄^-2, Na⁺, Ca⁺²를 첨가하여 그 영향을 관찰하였으며, SO₄^2-가 0.1M 함유된 cobalt 용액을 침전부상법으로 처리한 결과 zeta potential 의 감소 및 침전방해 등의 이유로 제거효율은 90%를 나타내었다.

Simulated liquid waste containing 50 ppm cobalt ion was treated by precipitate flotation using the surfactant of sodium lauryl sulfate. The effects of initial cobalt ion concentration, pH, surfactant concentration, removal time, gas flow rate and foreign ions were estimated on removal efficiency. 35% H₂O₂ was added for pre-treatment stage before precipitate flotation. As the result of pre-treatment, optimum removal pH and the pH of treated water being discharged were lowed and optimum removal pH range was broadened. For the result of this experiment, 99.8% removal efficiency was obtained at the condition of 50ppm of initial cobalt ion concentration, pH 9.5, 70 mL/min of gas flow rate, and 30 min of removal time. Attraction between precipitate and surfactant was supposed to be influenced by solubility and chemical affinity among species in sloution as well as zeta potential. The influence of foreign ions such as, NO₃^-, SO₄^-2, Na⁺, Ca⁺² on the removal efficiency was also observed. Removal efficiency by precipitate flotation ocontaining 0.1 M of SO₄^-2 ion decreased to 90% due to the decrease of zeta potential and interruption of precipitation.

Keywords:Liquid Waste Treatment;Foam Flotation;Precipitate Flotation;Cobalt Ion;Sodium Lauryl Sulfate

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[1] Parks GA, Chem. Rev., 65, 177 (1965)

[2] Gau CB, Huang SD, 界面科學, 第 7卷第 2期, 中華民國, 2 (1973)

[3] Grieves RB, Bhattacharyya D, Sep. Sci. Technol., 4, 301 (1972)

[4] Huang SD, Tzuoo JJ, Gau JJ, Hsieh HS, Fann CF, Sep. Sci. Technol., 19, 1061 (1984)

[5] Joseph CB, Brown JM, Nain MAK, Wilson DJ, Sep. Sci. Technol., 14, 777 (1979)

[6] Shakir M, Aziz M, Chem. Scripta, 11, 164 (1977)

[7] Naim MAK, Wilson DJ, Sep. Sci. Technol., 15, 1753 (1980)

[8] Haung SD, Haung MK, Gua JY, Wu TP, Haung JY, Sep. Sci. Technol., 23(4-5), 489 (1988)

[9] Bases CF, Mesmer RE, "The Hydrolysis of Cations," Robert E. Krieger Publishing Company, 203 (1986)

[10] Rosen JM, "Surfactants and Interfacial Phenomena," John Wiley & Sons, New York, 28 (1978)

[11] Adamson AW, "Physical Chemistry of Surface," John Wiley & Sons, New York, 217 (1982)

[12] Robertson RP, Wilson DJ, Wilson CS, Sep. Sci. Technol., 11, 569 (1976)