Advantages and Disadvantages of manual and mechanical mixing.
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Advantages and Disadvantages of manual and
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- Complete the following problems dealing with rapid mix tanks and flocculation basins:1. Design a rapid mix tank for water at 50° F flowing at Q = 4.0 MGD for a typical process train ina drinking water treatment plant. Use a square tank with a depth 1.25 times the width, a designvelocity gradient G = 900 sec−1, and a hydraulic detention time τ = 30 seconds. Specificallydetermine:a. Rapid mix tank dimensions in feet and inches, to the nearest one inch.b. Input water horsepower (hp).c. Impeller rotational speed if a vane-disc impeller is used having a diameter half of the tankwidth and employing six flat blades and a baffled tank.2. Design a flocculation basin for water at 10°C flowing at Q = 49,200 m3/day for a typical processtrain in a drinking water treatment plant. The basin shall be a cross-flow, horizontal-shaft, paddlewheel type with an average velocity gradient of G = 26.7 sec−1, a detention time τ = 45 minutes,and a Gτ value of 50,000 to 100,000. Tapered flocculation shall be…The design flow for a water treatment plant (WTP) is 4000 m3/d, the rapid mixing tank will have a mechanical mixer and the average alum dosage will be 50 mg/l. The theoretical mean hydraulic detention time of the tank will be 60 second and the depth is 1.4 m. Design a circular rapid mixing tank and determine the quantity of alum needed.The influent suspended solids concentration to a primary settling (clarifier) tank is 300 mg/L. The average flow rate is 0.037 m3/s. If the suspended solids removal efficiency is 65 percent, how many kilograms of suspended solids are removed in the primary settling tank each day?
- You are designing a flocculation basin to handle an average daily flow of 8 MGD with a temperature of 50°F. Laboratory tests show good results with a 40-minute flocculation time and mean velocity gradient of 30 s-1. Determine (a) the volume of the tank needed (in ft3) and (b) the mixing power (hp) required. Assume 1 hp = 550 ft.lb/s. Answer: about 30,000 ft3 and 1.3 hp8 Determine the solid loading rate on a secondary circular clarifier (diameter = 20 m) if the plant influent load is 2 ML/d. The recycle flow from secondary clarifier to the activated sludge system (aeration basin) is set to 10% of the influent load. It is also known that the aeration basin produces an MLSS (mixed liquor suspended solids) concentration of 3000 mg/L.A one cell rapid sand filter tank has a loading rate 9.0 m/h, surface dimensions of 15*6 m. The sand and gravel depths are 70 cm and 60 cm respectively. The height of wash trough is 50 cm and the height of water above surface of sand is 2.0 m. Note that Shape factor of sand is 0.80 and stratified bed porosity is 0.50. a) What flow rate (m³/sec) does the filter handle during production? b) What is the total height of filter basin (m)? c) Calculate the head loss if the value of this term [2 (Co fid)] equal to 105700. d) In your opinion this filter tank specified the Saudi specifications?
- For a spiral membrane filtration system, the membrane was fabricated by adding additional shims to the flow channel to increase the depth of the channel by 30% (the flow rate remains unchanged). What impacts will be on the crossflow velocity? A. increase by about 23% B. increase by about 13% C. decrease by about 23% D. decrease by about 13%The 550-bed Atlanta Hospital has a small, activated sludge plant to treat wastewater from the hospital. The average daily hospital discharge is 1.50 m3 per day per bed, and the average soluble BOD5 after primary settling is 450 mg/L. The aeration tank effective liguid dimensions of 10 m x 10 m x 5 m. The plant operating parameters are as follows: MLVSS - 2,600 mg/L; MLSS - 1.20 (MLVSS); Settling sludge volume after 30 min. = 200 mL/L. The aeration time is nearly?The 550-bed Atlanta Hospital has a small, activated sludge plant to treat wastewater from the hospital. The average daily hospital discharge is 1.50 m3 per day per bed, and the average soluble BOD5 after primary settling is 450 mg/L. The aeration tank effective liguid dimensions of 10 m x 10 m x 5 m. The plant operating parameters are as follows: MLVSS - 2,600 mg/L; MLSS - 1.20 (MLVSS); Settling sludge volume after 30 min. = 200 mL/L. The F/M ratio is nearly?
- Design a rapid mono-media sand filter for a plant that has a design flow rate of 120 MGD Filtering Unit Surface Dimensions. Design a filtering unit with a L:W of 2.5.Determine: a) Is this a satisfactory L:W?b) Width of each filtering unit (ft)c) Length of each filtering unit (ft)A sand bed filter is 50 ft in diameter and filled to a depth of 20 ft with sand. The sand particle diameter is 1 mm and the initial bed void fraction is .34. Wastewater containing 1% by volume suspended solids is fed to the filter at a rate of 4500 gpm by a positive displacement pump which can delvier this rate up to a discharge pressure of 45 psig. Determine how long in hours the filtration system can operate before shutting down for backwashing.If raw water having dynamic viscosity μ=0.001519N⋅s/m2 flows at rate of 30,000 m3/d into a rapid mix tank having hydraulic detention time τ=30s , determine the power input (kW) required to maintain a mixing velocity gradient of 1000 s-1.