2.원리
이 방법은 다른 방법과는 달리 세균을 확실하고 간편하게 농축하는 방법으로 균 농도가 낮은 물 시료 등에서 자주 사용된다. 여기에 표시한 것은 한천 배지와 액체 배지를 사용하여 필터 위에서 집락이 생기도록 한 것이지만 집균한 필터를 액체 배지가 담긴 시험관에 옮기고 최확수법을 이용
Filtration의 세번째 key concept 이유: (to promote readily biodegradable organics) -> GAC
In this slide, I will explain 2 kinds of problems of original flash mix. Structural and chemicals.
First, It has structural problems. As you can see the water flow direction, inlet locates downside and outlet locates upside.
Through this, we can know that axial impeller is not suitable. Also, becau
directed into pipes or holding tanks
to remove large debris such as sticks, leaves, trash and other large particles
water stored in reservoirs for periods between a few days and many months to allow natural biological purification to take place
salts are treated with soda-ash (Na2CO3) to precipitate CaCO3 out utilizing the common-ion effect
chlorinated to minimize the growth of fouling organ
is a low cost alternative to propellers. Vertical impeller flocculator has high energy efficiency (it means less power is required) and has low shear stress (lower variation in G). Also it can compact flocs well and has less settling problem at the bottom. Direction of water flow by impeller rotation must be down to prevent settling, and motor is on the top of the tank for easy maintenance.
3. Experiment & Procedure
3-1 Reagent
- Water, 수돗물(15℃)
3-2 Apparatus
- single media deep bed filter column
- manometer
- mass cylinder
- thermometer
- stopwatch
3-3 Procedure
1) 실험에 사용할 여재(모래)를 준비한다.(세척 및 이물질 분리)
2) 모래를 건조시킨 후, 체 거름을 이용하여 입자 크기를 잰다.
3) 공극률(P