Currently, septic tank in separate houses & flats decompose fecal sewage only by settling and anaerobic digestion. Therefore, decomposing efficiency is lower than the criteria set by government regulations. This study was carried out to ameliorate effluent water quality from septic tanks using madia , which is consisted of wasted fishing net. The septic tanks used in experiments are equipped in flats( villa called in Korean) in Su-yong district of Pusan city. Results of experiments are as follows 1. Biofilm was formed on the surface of media, wasted fish net and the components produced by anaerobic degradation was methane 42%, carbon dioxide 51 % respectively. 2. The effective volume was decreased to 50.0% in the first basin of septic tank at Hanyang villa , 24.0% at Sunmoon by scum and sludge after 8 months operation 3. Compared effluent water quality before and putting media into septic tank, the decreasing rate of effluent TBOD by media was shown 46.3% at Hanyang, 25.8% at Sunmoon(as the blank) and then the decreasing efficency by putting media was calculated to 20.5% 4. In the aspect of recycling wasted fishing net resulting to natural environmental protection and decreasing loading rate of municipal sewage treatment plant, the saved money of plant operation and disposal of wasted fishing net will be summed up to 3 billions won in Pusan.
I. 서론
II. 실험방법
III. 결과 및 고찰
IV. 결론