Onatural water is also know as a- Raw water. b-purified Water if in sedimentation tank, Volume of tank is (20*100*30)m and flow rate is 25 m² min detention time will be: a-2hr b-4hr then 3 if over flow rate or acontinuous flow type rectangy sedimentation tank is Kept at 400 lit/m²/hr with aplan area of 80m² and detention time of 2 hours then effective depth of the tank will be: a- 1.8m b-0.8m

Dechlorination contact tank (Wastewater Treatment) An activated sludge plant has a design flow (average daily flow) of 11 MGD.  Determine dimensions of dechlorination tank.    The design parameters: use 1 tank.   detention time = 30 sec, depth = 10 ft, rectangular tank:  L = 4 W. use maximum hourly flow (3 * Average design flow)

9-2. A flow of 20,000 maay which contains 100 mg/L of suspended solids is coagulated with 50 mg/L of alum. If 90 percent of the solids and chemical precipitates is removed in sedimentation estimate: (a) Total dry mass of sludge produced per day. (b) Total wet mass produced per day, assuming the sludge is 5 percent solids by weight. (c) Total volume produced per day, assuming the specific gravity of the wet sludge is 1.05.

A primary circular clarifier for a municipal wastewater treatment plant is to be designed for an average flow rate of 3570 m³/d. Given the surface loading rate is 35 m³/day.m² and assume that the peak flow factor is 2.5. Calculate: 1) Peak Flow Rate 2) Surface Area of the Clarifier 3) Diameter of the clarifier