논 면적(面積)이 75평(坪)되는 논바닥에 비닐을 깔고 생활오수(生活汚水)를 30cm정도(程度)의 수위(水位)를 유지시키면서 40일(日)동안 계속관개(繼續灌漑)하면서 수초(水草)인 부레옥잠을 재배(栽培)한 결과(結果) 다음과 같은 성적(成績)을 얻었다. 1. 부레옥잠재배(栽培)논 입구(入口)의 관개수중(灌漑水中) L.A.S함량(含量)은 6.33 ppm, 중앙부(中央部)는 3.50 ppm, 출구(出口)는 1.37 ppm으로 감소(減少)되었다. 2. 오수(汚水) 및 증류수(蒸溜水)에 부레옥잠을 넣어 재배(栽培)함으로서 L.A.S의 함량(含量)이 $7.3{ o}0$, $4.0{ o}0$ ppm으로 감소(減少)되었다. 3. 부레옥잠 뿌리의 표면(表面)을 alcohol로 살균(殺菌)한 결과(結果) L.A.S의 감소(減少)가 둔화되었다. 4. 생활오수(生活汚水)에 부레옥잠재배(栽培)로 COD가 $107{ o}32$.0ppm $NH_4-N가 $32.7{ o}16.3$ ppm으로 감소(減少)되었고 P, Na 및 Cl함량(含量)도 감소(減少)되었다.
Field experiments were carried out to evaluate the utility of water hyacinth(Eichhornia crassipes Solm-Laub) for purifyng sewage water in paddy fields of $247m^2$(75 Pyung). A field was lined with PVC film at a depth of 30cm and sewage water for 40 days. The results obtained with the use of water hyacinth in the sewage water are summarized as follows : 1. The Sodium linear dodecyl benzene sulfonate content of sewage water on the inlet was 6.33 ppm, themiddle point was 3.50 ppm and the outlet was 1.37 ppm. 2. With the use of water hyacinth in the sewage and the distilled water, the L.A.S. content were decreased from 7.3 and 4.0 to 0, respectively. 3. Sterillization with 70% ethyl alcohol at the roots of the water hyacinth was reduced the degradation effect of L.A.S. 4. The COD and $NH_4^+-N$ content of the sewage decreased from 107 and 32.7 ppm to 32.6 and 16.2 ppm, respectively and the P, Na and Cl content also were reduced.
