Abstract

본 연구에서는 농어촌취락배수의 효율적 처리를 위해 수생식물인 부레옥잠과, 미나리를 이용한 연속식 실험에서 유기물부하(COD)와 Total N, Total P 등을 HRT와 농도를 달리하여 제거효율을 측정하였다. 유기물(COD)의 제거효율은 HRT가 2 day인 부레옥잠조에서는 평균 50%의 제거율을 보였으며, 미나리조에서는 HRT 1.2<TEX>$\sim$</TEX>2 day 동안 30<TEX>$\sim$</TEX>50%의 제거율을 보였다. 영양염류의 제거효율은 총 질소의 경우 부레옥잠조는 약 329 kg <TEX>$N/ha{\cdot}day$</TEX>의 부하에서 HRT 2<TEX>$\sim$</TEX>3 day인 경우 40<TEX>$\sim$</TEX>53%가 제거되었으며, <TEX>$NH_4^+-N$</TEX>의 제거효율은 평균 52%로 Total N의 제거효율보다 다소 높았으며, 인은 8.2 kg <TEX>$P/ha{\cdot\}day$</TEX>의 부하에서 HRT 2<TEX>$\sim$</TEX>3 day인 경우 31<TEX>$\sim$</TEX>40%로 조사되었다. N 및 P 흡수율은 미나리보다 부레옥잠이 높게 나타났으며, 인의 흡수율은 질소의 흡수에 비해 낫게 조사되었다. This study was carried out to investigate sewage treatment efficiencies using water hyacinth (Eichhornia crassipes) and watercress (Oenanthe Javanica). In the hyacinth system about 30% of COD introduced was removed during 2 days of hydraulic retention time, and about 30<TEX>$\sim$</TEX>50% of COD was removed in the watercress system during 1.2<TEX>$\sim$</TEX>2 days of hydraulic retention time. Therefore, COD loading of <TEX>$76\sim170$</TEX> kg <TEX>$COD/ha{\cdot}day$</TEX> was removed during 2<TEX>$\sim$</TEX>3 days of hydraulic retention time at the 0.18 <TEX>$m^2$</TEX> area in the water hyacinth-watercress continuous system. Also 40<TEX>$\sim$</TEX>50% of N and P in the sewage were removed in the tested water hyacinth-watercress system Although COD, N and P concentrations in the final effluent were still higher than the limits of waste discharge, applicability of this waste water treatment system should be further investigated as an alternative method far small scale sewage treatments.

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