Korean Journal of Environmental Agriculture (한국환경농학회지)

The Korean Society of Environmental Agriculture (한국환경농학회)
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Evaluation of Pollutant Removal Efficiency in Environmentally Friendly Full-scale Constructed Wetlands for Treating Domestic Sewage during Long-term Monitoring

장기 모니터링을 통한 환경친화형 인공습지 하수처리장의 수질정화효율 평가

  • Seo, Dong-Cheol (Department of Oceanography and Coastal Sciences, Louisiana State University) ;
  • Jo, In-Seong (Division of Applied Life Science, Gyeongsang National University) ;
  • Lim, Seok-Cheon (Division of Applied Life Science, Gyeongsang National University) ;
  • Lee, Byeong-Ju (Division of Applied Life Science, Gyeongsang National University) ;
  • Park, Seong-Kyu (Division of Applied Life Science, Gyeongsang National University) ;
  • Cheon, Yeong-Seok (Division of Applied Life Science, Gyeongsang National University) ;
  • Park, Jong-Hwan (Division of Applied Life Science, Gyeongsang National University) ;
  • Lee, Hong-Jae (Department Sancheong Insitute of Medicinal Herb on Foundation) ;
  • 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 (루이지애나주립대 해양연안과학과) ;
  • 조인성 (경상대학교 응용생명과학부) ;
  • 임석천 (경상대학교 응용생명과학부) ;
  • 이병주 (경상대학교 응용생명과학부) ;
  • 박성규 (경상대학교 응용생명과학부) ;
  • 천영석 (경상대학교 응용생명과학부) ;
  • 박종환 (경상대학교 응용생명과학부) ;
  • 이홍재 ((재)산청한방약초연구소) ;
  • 조주식 (순천대학교 생명환경과학부) ;
  • 허종수 (경상대학교 응용생명과학부)
  • Published : 2009.06.30
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Abstract

A constructed wetland which was composed of aerobic and anaerobic areas was evaluated for 3 years to effectively treat the sewage produced in farming and fishing communities. For 3 years in a constructed wetland, biochemical oxygen demand(BOD), chemical oxygen demand(COD), suspended solids(SS), total nitrogen(T-N), and total phosphorus(T-P) in effluent were 0.2${\sim}$11.8, 1.0${\sim}$41.9, 1.1${\sim}$6.5, 4${\sim}$60 and 0.02${\sim}$3.51 mg/L, respectively. Removal rate of BOD, COD and SS in effluent were 97, 92 and 99%, respectively, in the third year. As time goes by, removal rate of T-N and T-P in treated water in aerobic area and effluent were gradually increased in a constructed wetland. In the third year, removal rate in effluent were 62 and 73%, respectively. By the seasons, removal rate of BOD, COD, SS, T-N and T-P were 97${\sim}$98, 87${\sim}$91, 99, 43${\sim}$61 and 76${\sim}$86%, respectively. Removal rate of BOD, COD, SS and T-P were not affected by the seasons, but that of T-N in winter and spring were decreased than the other seasons.

농어촌 등에서 소규모로 발생하는 하수를 환경친화형 인공습지 하수처리장에서 효과적으로 처리하기 위하여 인공습지 하수처리장을 시공한 후 3년 동안의 수처리 효율을 조사하였다. 하수처리 시기별 오염물질 농도 변화를 조사한 결과 BOD, COD 및 부유물질은 하수원수 농도의 편차가 심하였으나, 호기성조와 혐기성조를 통과하면서 농도가 급격히 감소하여 방류수의 BOD는 0.2${\sim}$11.8 mg/L, COD는 1.0${\sim}$41.9 mg/L 및 SS 함량은 1.1${\sim}$6.5 mg/L이었다. 방류수의 총 질소 농도는 4${\sim}$60 mg/L범위로 각 조에 유입되는 총 질소 농도에 따라 편차가 심하였고, 방류수의 총 인 농도는 0.02${\sim}$3.51 mg/L범위이었다. 연차별 BOD, COD 및 부유물질 처리효율은 연차에 따라 큰 차이를 보이지 않았으며, 시공 후 3차년도의 방류수의 BOD, COD, 부유물질의 처리효율은 각각 97, 92 및 99%로 매우 높았다. 연차별 총 질소와 총 인의 처리효율은 호기성조 처리수와 방류수 모두에서 연차가 증가함에 따라 점차 그 처리효율이 증가하는 경향이었으며, 시공 후 3차년도의 방류수 중 총 질소 및 총 인 처리효율은 각각 62 및 73%이었다. 계절별 BOD, COD, 부유물질 및 총 인의 처리효율은 4계절 모두 큰 차이가 없었으며, 방류수의 BOD 처리효율은 97${\sim}$98%, COD 처리효율은 87${\sim}$91%, 부유물질 처리효율은 99% 및 총 인 처리효율은 76${\sim}$86%로 나타났다. 하지만 계절별 방류수의 총 질소 처리효율은 봄과 겨울철이 다른 계절에 비해 처리효율이 약간 감소하였고, 특히 겨울철 방류수의 총 질소 처리효율은 43%로 여름철의 61%에 비해 18%정도 감소하였다.

Keywords

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