Ⅲ Flocculation
The purpose of flocculation is to uniformly mix coagulated water to produce either settleable or filterable floc and accelerate the rate of particle collisions, causing the agglomeration of electrolytically destabilized colloidal particles into settleable and filterable sizes.
Considerations of flocculation are:
1. Baffling to prevent of flow short-circuiting
2. Tapered
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
Figure 13 shows that cryo pump is cooling pump. It means this pump is cooling, liquefaction and store air, not pumping. Generally, it has 3 processes like condensation, absorption and trap at low temperature. The cooled air or molecules do not have any momentum so it is no possibility to heat any molecules. It means vacuum.
Cryo pump have High emission velocity and high emission capacity so it
velocity = 0.2m/s assumed
Velocity through clean bar screen =0.3m/s assumed
Peak design water flow = 0.10417m3/s
Depth of flow in the conduit at peak design flow =1.2m assumed
headloss
hL==1/C ((V^2-v^2)/2g)=1/0.7 ((〖0.3〗^2-〖0.2〗^2)/(2*9.81))=0.003641m
Clear area through the rack openings =0.10417/0.3=0.3472m2=0.35m2
Clear width of the opening at the rack