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A Study on the Improvement of Treatment Efficiency for Nitrogen and Phosphorus by Improved Sewage Treatment Process in Constructed Wetland by Natural Purification Method

자연정화공법에 의한 인공습지 하수처리장에서 하수처리 공정개선에 따른 질소 및 인의 처리효율 향상 방안

  • Seo, Dong-Cheol (Wetland Biogeochemistry Institute, Louisiana State University) ;
  • Park, Woo-Young (Division of Applied Life Science, Gyeongsang National University) ;
  • Lim, Jong-Sir (Division of Applied Life Science, Gyeongsang National University) ;
  • Park, Chan-Hoon (Division of Applied Life Science, Gyeongsang National University) ;
  • Lee, Hong-Jae (Department of Environmental Engineering, Jinju National University) ;
  • Kim, Hong-Chul (Department of Microbiological Engineering, Jinju National University) ;
  • Lee, Sang-Won (Department of Microbiological Engineering, Jinju National University) ;
  • Lee, Do-Jin (Department of Agricultural Education, Sunchon National University) ;
  • Cho, Ju-Sik (Division of Applied Life and Environmental Sciences, Sunchon National University) ;
  • Heo, Jong-Soo (Division of Applied Life Science, Gyeongsang National University)
  • 서동철 (루이지애나주립대학교 습지생물지구화학연구소) ;
  • 박우영 (경상대학교 응용생명과학부) ;
  • 임종서 (경상대학교 응용생명과학부) ;
  • 박찬훈 (경상대학교 응용생명과학부) ;
  • 이홍재 (진주산업대학교 환경공학과) ;
  • 김홍출 (진주산업대학교 미생물공학과) ;
  • 이상원 (진주산업대학교 미생물공학과) ;
  • 이도진 (순천대학교 농업교육과) ;
  • 조주식 (순천대학교 생명환경과학부) ;
  • 허종수 (경상대학교 응용생명과학부)
  • Published : 2008.03.31

Abstract

To effectively treat the domestic sewage that was produced on a small-scale in farming and fishing village in order to encourage an ecologically friendly environment, a small-scale sewage treatment apparatus using natural purification methods that consisted of an aerobic and an anaerobic plots were constructed. The efficiency of sewage treatment according to the sewage loading was investigated to obtain the optimum sewage loading in small-scale sewage treatment apparatus. Removal rate of pollutants according to the sewage loading were in the order of $150\;Lm^{-2}day^{-1}{\fallingdotseq}300\;Lm^{-2}day^{-1}>600\;Lm^{-2}day^{-1}$. Therefore, the optimum sewage loading was 300 L m-2 day-1. Under the optimum sewage loading, removal rate of BOD, $COD_{Mn}$, turbidity, T-N and T-P were 99, 94, 99, 49 and 89%, respectively. However, to satisfy the water quality standard in effluent in small-sclae sewage treatment apparatus for domestic sewage treatment, the low removal efficiency of T-N and T-P must be improved. So to improve the removal rate of T-N and T-P, the efficiency of sewage treatment according to the improved sewage treatment process such as, re-treatment at aerobic plot, anaerobic condition of aerobic plot, changing the filter media sizes and the depths in anaerobic plot, and also addition of oyster shells to filter media at anaerobic plot were investigated. In case of 150 cm depth in anaerobic plot with filter medium A (effectivity particle size 1.50 mm) and addition of oyster shells to filter media at anaerobic plot, removal rate of T-N and T-P in both plots were increased by 10 and 3%, and 14 and 7% in comparison with 100 cm depth in anaerobic plot with filter medium B(effectivity particle size 0.95 mm), respectively. The optimum improved sewage treatment process in small-scale sewage treatment apparatus were 150 cm depth in anaerobic plot with filter medium A and addition of oyster shells to filter media at anaerobic plot.

Keywords

constructed wetland;sewage treatment;oyster shell;T-N;T-P;anaerobic plot;aerobic plot

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