DOI QR코드

DOI QR Code

Determination of Optimum Coagulants (Ferric Chloride and Alum) for Arsenic and Turbidity Removal by Coagulation

Choi, Young-Ik;Jung, Byung-Gil;Son, Hee-Jong;Jung, Yoo-Jin

  • 투고 : 2010.04.29
  • 심사 : 2010.08.03
  • 발행 : 2010.08.31

초록

The Raw water from Deer Creek (DC) reservoir and Little Cottonwood Creek (LCC) reservoir in the Utah, USA were collected for jar test experiments. This study examined the removal of arsenic and turbidity by means of coagulation and flocculation processes using of aluminum sulfate and ferric chloride as coagulants for 13 jar tests. The jar tests were performed to determine the optimal pH range, alum concentration, ferric chloride concentration and polymer concentration for arsenic and turbidity removal. The results showed that a comparison was made between alum and ferric chloride as coagulant. Removal efficiency of arsenic and turbidity for alum (16 mg/L) of up to 79.6% and 90.3% at pH 6.5 respectively were observed. Removal efficiency of arsenic and turbidity for ferric chloride (8 mg/L) of up to 59.5% at pH 8 and 90.6% at pH 8 respectively were observed. Optimum arsenic and turbidity removal for alum dosages were achieved with a 25 mg/L and 16 mg/L respectively. Optimum arsenic and turbidity removal for ferric chloride dosages were achieved with a 20 mg/Land 8 mg/L respectively. In terms of minimizing the arsenic and turbidity levels, the optimum pH ranges were 6.5 and 8for alum and ferric chloride respectively. When a dosage of 2 mg/L of potassium permanganate and 8 mg/L of ferric chloride were employed, potassium permanganate can improve arsenic removal, but not turbidity removal.

키워드

Arsenic;Coagulation;Drinking water treatment;Flocculation;pH control

참고문헌

  1. Chen, H., Frey, M. M., Clifford, D., McNeil, L. S., Edwards, M.,1999, Arsenic treatment considerations, J. of American Water Works Association, 91, 74-85.
  2. Chen, S. L., Dzeng, S. R., Yang, M. H., 1994, Arsenic species in ground waters of the black-foot diseases area,Taiwan, J. of Environ. Sci. Technol., 28, 877-881. https://doi.org/10.1021/es00054a019
  3. Edwards, M., 1994, Chemistry of arsenic removal during coagulation and Fe-Mn Oxidation, J. of American Water Works Association, 86, 64-78.
  4. Ghosh, M. M., Yuan, J. R., 1987, Adsorption of inorganic arsenic and organo arsenicals on hydrous oxides, Environmental Progress, 6 , 150-157. https://doi.org/10.1002/ep.670060325
  5. Gregor, J. E., 2001, Arsenic removal during conventional aluminum-based drinking-water treatment, Wat. Res., 35, 1659-1664. https://doi.org/10.1016/S0043-1354(00)00424-3
  6. Gupta, S. K., Chen, K. Y., 1978, Arsenic removal by adsorption, J. of Water Pollution Control Federation, 50, 493-506.
  7. Lee, Y., Um, I. H., Yoon, J., 2003, Arsenic (III) Oxidation by Iron (VI)(Ferrate) and Subsequent Removal of Arsenic (V) by Iron (III) Coagulation, J. of Environ. Sci. Technol., 37, 5750-5756. https://doi.org/10.1021/es034203+
  8. Pallier, V., Feuillade-Cathalifaud, G., Serpaud, B., Bollinger, J., 2010, Effect of organic matter on arsenic removal during coagulation/flocculation treatment, J. of Colloid and Interface Science, 342, 26-32. https://doi.org/10.1016/j.jcis.2009.09.068
  9. Pontius, F. W., Brown, K. G., Chen, C. J., 1994, Health implications of arsenic in drinking water, J. of American Water Works Association, 86, 52-63.
  10. Thirunavukkarasu, O. S., Virarghavan, T., Subramanian, K. S., Tanjore, S., 2002, Organic arsenic removal from drinking water, J. of Urban Water, 4, 415-421. https://doi.org/10.1016/S1462-0758(02)00029-8

과제정보

연구 과제 주관 기관 : Dong-A University