Journal of Korean Society of Environmental Engineers (대한환경공학회지)

Korean Society of Environmental Engineers (대한환경공학회)
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Removal Improvement in Water Treatment Plant for Occurrence of Diatoms (Synedra sp.) in the Nakdong River

낙동강유역 상수원의 규조류 발생에 따른 정수장에서 제거율 향상 방안

  • Kim, Min-Chai (Kwater Gyeongnam Busan Water Supply Regional Headquarters) ;
  • Kim, Ji-Hoon (Kwater Gyeongnam Busan Water Supply Regional Headquarters) ;
  • Seo, Gyu-Tae (Department of Environmental Engineering, Changwon National University)
  • 김민채 (한국수자원공사 경남부산지역본부) ;
  • 김지훈 (한국수자원공사 경남부산지역본부) ;
  • 서규태 (창원대학교 환경공학과)
  • Received : 2013.11.26
  • Accepted : 2013.12.24
  • Published : 2014.01.31
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Abstract

This study was conducted to investigate removal characteristics for Synedra sp. and filter run time (FRT) according to the cell length in the Nakdong River. When used alone flocculent, the removal efficiency for Synedra tenera (around $100{\mu}m$) was constant with 90.9~94.4%, while Synedra acus (around $300{\mu}m$) had the lower removal efficiency as 60~70%. $PACS_2$ and PAC showed 5~6% higher removal for S. acus than others (HiB and LAS). When added coagulant aid, loess had no effect and also needed more amount of flocculent. Sodium Silicate increased the removal rate by max 10.6%. On the other hand, 2.5 mg/L of Polyamine showed 96.9% removal efficiency for S. acus increasing up to 25% more than $PACS_2$ alone. In the effect of water temperature, the removal for S. acus at $15^{\circ}C$ were 6% higher than at $4^{\circ}C$. There was no significant correlation between the removal efficiencys of turbidity and S. acus. The results of this study was similar to the actual water treatment process's removal characteristics for Synedra sp. depending on the cell length and temperature. In the actual process, the numbers of Synedra in settled water was established natural logarithm function with the filter run time (FRT), so we can predict FRT as Synedra numbers.

본 연구는 낙동강에 출현하는 Synedra 속의 길이 차이가 제거 효율과 여과지속시간에 미치는 영향과 특성을 고찰하였다. 길이가 $100{\mu}m$ 내외인 S. tenera 제거율은 90.9~94.4%로 고른 반면, 길이가 $300{\mu}m$ 내외인 S. acus 제거율은 60~70%로 낮았다. 무기응집제 만을 사용할 때 $PACS_2$와 PAC가 다른 응집제보다 S. acus 제거율이 5~6% 높았다. 황토 첨가는 주 응집제의 주입률을 15 mg/L 증가시키고, 모든 Synedra 속의 제거율을 감소시키는 역효과가 나타났다. Sodium Silicate 첨가는 S. acus의 제거율은 다소 향상시켰다. Polyamine은 2.0~2.5 mg/L 첨가하여 S. acus 제거율을 96.9%까지 상승시켰다. Polyamine 주입률과 S. acus 제거율은 비례관계식이 성립하였다. 수온 $15^{\circ}C$가 $4^{\circ}C$보다 S. acus 제거율이 높았다. S. acus의 제거율과 탁도 제거율 및 다른 조류 제거율간의 상관성이 매우 낮았다. 2012년 정수장 운영 사례에서 Synedra 속의 길이에 따른 제거율 특성이 본 실험결과와 비슷하였다. 침전수의 S. acus 개체수와 여과지속시간은 ln 함수관계가 성립되어 여과지속시간을 예측할 수 있었다.

Keywords

References

  1. Ha, G., Kim, H. W. and Ju, G. J., "The correlation between Phytoplankton and Water Quality in Downstream of Nakdong River," Inje University Environment Institute, 4th Symposium, pp. 21-39(1995).
  2. Lee, G. S., Kim, M. C., Kwon, J. K. and Seo, G. T., "Effect of pH adjustment by $CO_2$ on Coagulation and Aluminum Elution in Water Treatment," J. Kor. Soc. Environ. Eng., 35(1), 17-22(2013). https://doi.org/10.4491/KSEE.2013.35.1.017
  3. Lee, H. Y., "A study on the Filter Clogging by S. acus in raw water," Waterworks Headquarters Daegu Metropolitan City, Waterworks Workshop, pp. 247-236(1998).
  4. Jun, H. B., Lee, Y. J., Lee, B. D. and Lee, J. D., "Optimal Combination of Coagulants for Removal of the Filter Clogging Algae," J. Kor. Soc. Environ. Eng., 20(12), 1803-1809
  5. Hiroshi, K., Asuhisa, S. and Yasumoto, M., "Influence of Length of Slender Type Diatom and Size of Filter Grain to Filter Clogging Problem in Rapid Sand Filteration Process," Water Technol, 24(1), 41-47(1997).
  6. Jun, H. B., Lee, Y. J., Lee, B. D. and Ahn, C. J., "Effect of the Ratio of Diatom Length to the Effective Size of Filter Medium on Filter Clogging," J. Kor. Geo-environ Soc., 2(1), 31-35(2001).
  7. Park, G. T., "The Water treatment by Mixture of organic and inorganic coagulants at low temperatures," Master's Thesis, Kyungpook National University(1999).
  8. Lim, Y. S., Song, W. S., Cho, J. S., Lee, H. J. and Heo, J. S., "The Effect of Algae on Coagulation and Filteration of Water Treatment Process," J. Kor. Environ. Agric., 19(1), 13-19(2000).
  9. Ha, T. W., "Analysis of the Characteristic for the Application of Polymer Flocculants (polyamine, poly (DADM)) to Potable Water Treatment," J. Environ. Sci., 13, 23-35(1999).
  10. Gwak, J. U., "Aggregation of inorganic coagulants for water treatment theory and recent developments," 28th Water Symposium, Kwater, pp. 41-65(1994).
  11. Lee, J. D., "Sinking Behavior of Freshwater Diatoms-With Special Reference to Measurement of Phytoplankton Sinking Rate," J. Kor. Soc. Water Qual., 18(6), 683-692(2002).
  12. Ha, G. S., Lee, S. W. and Lee B. S., "Removal of Synedra A. by coagulation in raw drinking water," Proceeding of the 1998 spring conference, Kor. Soc. Environ. Eng., pp. 316-317(1998).
  13. Jun, H. B., "Effects of Prechlorination on Diatoms Coagulation," J. Kor. Soc. Water Environ., 17(3), 347-365(2001).
  14. Choi, S. K., Lee, J. Y. and Cho, K. J., "Floc-Sedimentation Efficiency of Problematic Algae in the Water Treatment Process," Proceeding of the 2003 autumn joint conference of KSWW and KSWQ, E51-E53.
  15. KWWA, Waterworks facility standards, pp. 332-333(2010).
  16. Lee, J. H. and Kim, Y. J., "A study on the Removal of Algae by Coagulation and Sedimentation in the Raw water of the Nakdong River," J. Kor. Soc. Environ. Eng., 10(2), 113-117 (2001).
  17. Park, J. H., Lee, J. D. and Cho, S. J., "Study of diatom removal by preozonation and polyamine coagulat and characteristics of their sinking rate," Proceeding of the 2001 autumn joint conference of KSWW and KSWQ, pp. 347-350.
  18. Kim, S. J., "Flocculation of Red Tide Organisms in Sea Water by Using an Ignited Oyster Shell Powder and Loess Combination," J. Kor. Fish. Soc., 36(6), 716-722(2003). https://doi.org/10.5657/kfas.2003.36.6.716
  19. Lee, H. D., Lee, E. S. and Seo, G. T., Biology of Waterworks, pursuit of truth publisher corp., pp. 35-39, 209-250 (1996).
  20. NIER, "Phytoplankton occurrence of the Nakdong River," NIER, pp. 35-37(2000).
  21. Kawamura, S., "Considerations on Improving Flocculation," J. AWWA, Research, pp. 328-337(1976).
  22. Lee, Y. J., Coagulation Characteristics and Removal Mechanism of Filter Clogging Algae, Master's Thesis, Chungnam National University(1999). (1998).