1. The design flow for a water treatment plant (WTP) is 1 MGD (3.8x103 m'/d). The...
Example 8: A 10 MGD (million gallons per day) surface water treatment plant proposes to use alum coagulation for turbidity reduction using 45 mg/L alum! dosage. The raw water has an alkalinity of 20 mg/L as CaCo,. Commercial alum has the formula Al(SO2)2.144,0 (MW = 594). Determine the daily alum dosage required in kg/d. Z.6 -> EW - 99
A water treatment plant is processing water at a flow rate of 1.5 m/s using three parallel treatment trains. The detention times for the rapid mix tank, flocculation basin, and rectangular sedimentation basin are 10 sec, 30 min and 60 min, respectively. The velocity gradients for the rapid mix and flocculation tanks are 900 s and 60:40:20 s1, respectively. The viscosity of water is 0.001 Pa-s. (a) Determine the size and power requirements for rapid mix tanks. (b) Determine the...
1. A square rapid mixing basin, with a depth of water (i.e., basin's depth) equal to 1.25 times the width, is to be designed for a flow of 2 million gallons per day. G is 790 per second; detention time is 40 second; operating temperature is 10 °C. Determine the following: Basin dimensions Horsepower required (mixer is 100% efficient) • 2. A rapid mix tank, equipped with a mechanical mixer, will be used to mix the coagulant into water at...
A water treatment plant (10 MGD) uses 50 kg/d of chlorine. The residual chlorine after 30 minutes contact time is 0.55 mg/L. Find the chlorine dosage and chlorine demand of the water.
Secondary Treatment Based on a plant flow rate of 40 mgd, design an activated sludge, secondary treatment system with recycle which maintains a MLVSS = 2,000 mg/L in the aeration reactor and has an average Solids Retention Time (SRT)-4 days. The biota kinetic constants are Kinetic Coefficients for the Activated-sludge Process for the Removal of Organic Matter from Domestic Wastewater Endogenous Decay Coefficient- k(d) 0.1 Half-velocity constant- K(s VSS/qVss-da 15 Mg/L bsCOD Max. Specific Substrate Utilization Rate-k 6 G bsCOD/gVSS-da...
4. (20 pts) A rapid mixing basin is designed to process 3.0 MGD of water. The basins will be square, and the depth is assumed to be 1.times of the width. Use a detention time of 30 s and velocity gradient of 750 s'. Two basins will be constructed each having a capacity to process exactly half the entire water flow. Determine: (a) Dimensions of the basin (L, W and H) (b) Power input (hp) (c) Rotational speed (rpm) of...
Water and Wastewater Treatment SP-WATER TREATMENT PLANT SEDIMENTATION BASIN Design a rectangular, horizontal flow sedimentation process for a water treatment plant for turbidity removal Design Maximum Day Flow-20,000 m2ld Two parallel sedimentation tank, each designed for half of the total flow Depth 4.5 m, Width 6 m, Surface Overflow Rate 50 m/day Chain and flight sludge collector will be used, hence the limiting width of 6 m. Minimum Hydraulic Retention Time (detention time) 2 hrs Maximum weir rate 250 m/day/m...
Ex. 4 A water treatment plant with a maximum daily flow of 3 m/s (1.5 times the average flow) is treating a surface water. The water is coagulated with alum and the alum floc was measured to have a settling velocity of 2.2 m/h at 10 °C. Design a horizontal-flow rectangular sedimentation system based on the maximum day flowrate. Include the number of basins, dimensions and criteria checks.
Design a grit chamber for a wastewater treatment plant with an average flowrate of 25,000 m3/d and a peak flowrate of 55,000 m/d. The detention time at peak flow is 3.0 min. The width to depth ratio is 2:1. Use a depth of 2 m. The aeration rate is 0.4 m/min per m of tank length. a) Determine the total air required, (15 points) b) Dimensions of the grit chamber, (15 points) c) Determine detention time at average flow. (10...
[3 pts] A water treatment plant consists of coagulation, flocculation, sedimentation, filtration and disinfection. The suspended solids concentration in the raw water coming into the plant is 500 mg/L and the plant treats 8 MGD. Alum (Al2(S04)3 14H20) is used as a coagulant with a dose of 50 mg/L. Compute the total solid sludge produced daily if a complete reaction of alum to aluminum hydroxide (Al(OH)3] occurs and 98% total solids are removed by the sedimentation and filtration steps. The...