2000 B.C - The first recorded (The Susruta Samhita, Sanskrit writing) water purification began with the Egyptians. It is said that impure water should be boiled over a fire, heated in the sun, have a hot iron dipped into it or purified by filtration through sand and course gravel.
A major step in the development of desalination technologies came in the 1940s during World War II when various m
pressure; therefore a pressure difference is not needed.
By far the most important application of dialysis is the therapeutic treatment of patients with renal failure. The technique is called hemodialysis and attempts to mimic the action of the nephron of the kidney in the separation of low molecular weight solutes, such as urea and creatinine, from the blood of patients with chronic uremia.
water flow direction, inlet locates downside and outlet locates upside.
Through this, we can know that axial impeller is not suitable. Also, because of wide width of tank, it has poor mixing.
Second, there is a problem with chemicals. PAC is injected with Cl2, so activation of Cl2 must be restricted.
Also, using alum may cause settling.
Alum lowered pH in localized area. To overcome this
Cooling tower location
Hazardous area
Cooling tower fog control
Winter operation
Cooling water 화학적 처리 목적
냉각 표면의 SCALE 방지
Cooling water와 접촉되는 금속의 부식 방지
냉각 탑 자체와 냉각표면의 FOULING 방지
COOLING TOWER TIMBER
2-4. Song jeon Watertreatment plant
- Korea’s first Advanced WaterTreatment Process
- Living water supply (200,000 tons)
- Improved health , sanitation, culture level
- Local economy development
3. Factors of DAF efficiency
Ozone concentration
Temperature
Bubble Size