논문 상세보기
pp.999-1005
The H water treatment plant has been operating since 1982 and has had no renovation. It is assumed that the filters have been operated for more than 30 years and therefore are deteriorated. Many of the filters show an unequal state of air scouring during backwashing. For this study one filter, which was presumed most deteriorated among eighteen filters, was selected as a model filter for renovation. Some of the effects seen after renovation of the underdrain system were a lower average filtrated turbidity by approximately 0.02 NTU and an equal backwash state throughout the filter bed. Sand wash efficiencies by backwash before renovation of the underdrain system were 28%, 8%, and 5% at the surface, 50 cm depth, and 100 cm depth, respectively, and after renovation of the underdrain system were 94%, 26%, and 15% , respectively. The standard deviation of the effective sand size was 0.025-0.033 mm before renovation of the underdrain system and 0.002-0.011 mm after renovation of the underdrain system, meanings there was equal backwash pressure throughout the filter. Filtration time after renovation was approximately 2 times longer than before renovation.
1. 서 론
2. 실험 재료 및 방법
2.1. 실험 재료
2.2. 실험 방법
3. 결과 및 고찰
3.1. 노후 급속 모래여과지 개량 작업
3.2. 노후 급속 모래여과지 개량에 따른 하부 집수장치압력 분포
3.3. 노후 급속 모래여과지 개량에 따른 여과 효율 비교
3.4. 하부집수장치 개량에 따른 역세척 효율 평가
3.5. 노후 급속 모래여과지 개량에 따른 여과 지속시간비교
3.6. 노후 급속 모래여과지 개량에 따른 여재 입경분포비교
4. 결 론
REFERENCES
