The design flow for a water treatment plant (WTP) is 1 MGD (3.8x10' m' /d). The rapid mixing tank will have a mechanical mixer and the average alum dosage will be 30 mg/L. The theoretical mean hydraulic detention time of the tank will be 1 minute. Determine the following: a) the quantity of alum needed on a daily basis in kg/d, b) the dimensions of the tank in meters for a tank with equal length, width, and depth, c) the power input required for a G of 900 sec' for a water temperature of 10 °C. Express the answer in kW, given that u = 1.307 x 10³Kg/m.s.

The design flow for a water treatment plant (WTP) is 1 MGD (3.8x10' m' /d). The rapid mixing tank will have a mechanical mixer and the average alum dosage will be 30 mg/L. The theoretical mean hydraulic detention time of the tank will be 1 minute. Determine the following: a) the quantity of alum needed on a daily basis in kg/d, b) the dimensions of the tank in meters for a tank with equal length, width, and depth, c) the power input required for a G of 900 sec' for a water temperature of 10 °C. Express the answer in kW, given that u = 1.307 x 10³Kg/m.s.

Structural Analysis

6th Edition

ISBN:9781337630931

Author:KASSIMALI, Aslam.

Publisher:KASSIMALI, Aslam.

Chapter2: Loads On Structures

Section: Chapter Questions

Problem 1P

See similar textbooks

Similar questions

The design flow for a water treatment plant (WTP) is 7.2 x 10³ m³/d. The rapid mixing tank will have a mechanical mixer and the average alum dosage is 50 mg/L. The theoretical mean hydraulic detention time of the tank is 1.5 minutes. Determine the followings: (i). The quantity of alum needed on a daily basis. (ii). The dimensions of the tank in meters for a tank with equal length, width, and depth. (iii). The power input required for a G of 1000 s¹ for a water temperature of 25°C.
Q.5. The design flow for a water treatment plant (WTP) is 1 MGD. The rapid mixing tank will have a mechanical mixer and the average alum dosage will be 35 mg/L. the theoretical mean hydraulic detention time of the tank will be 60 seconds. Determine the following: 1-The quantity of alum needed on a daily basis in kg/d, 2-The dimensions of the tank in meters for a tank with equal length, width and depth, 3- The power input required for aggo Go of 900 seê' forawa te Tempreature of lóc (M=1•307*15°N• s/mz express The a $is wer in kw
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.
A completely mixed activated sludge process operating at equilibrium is designed to treat 300 MLD of waste water. The influent and effluent BOD are 200 mg/1 and 18 mg/1 respectively If the F M then the hydraulic retention time is A 0.125 day B 4.21 hours C 8.42 hours D 0.225 day = 0.3 and MLSS is 3800 mg/1,
A tank is initially filled to capacity with 300 L pure water. At t=0, brine containing 2 g/L salt is pumped into the tank at a rate of 25 L/min. The well-mixed solution is pumped out at a larger rate of 50 L/min. Determine the concentration of the salt inside the tank after 5 min. Use dQ/dt = ci vi - co vo as a formula
2. (a) Design a gravity thickener to concentrate the mixture of sludge obtained from primary and secondary settling units in an activated sludge wastewater treatment plant. Make appropriate assumptions in your calculations. Sludge waste flow rate in the primary settling unit= 140 m³/d; and concentration = 2.5% Sludge waste flow rate in the secondary settling unit= 350 m/d; and concentration = 0.6% Qi ci Solids Loading Rate (SLR) = 40 kg ds / m².d, and SLR : A ci Qi Tc Expression for thickening zone depth= 0.75Cu A Ci: Incoming mixed sludge concentration Qi: Incoming mixed sludge flow rate A: Cross section area of the thickening tank Cu: Target underflow concentration (=5%) Tc: Time in compression zone (=2 days)
A storage tank of a treatment water has a holding capacity of 750 m' up to an overflow point. The treatment water having silica content of 0.003 mg /L is flowing in to a tank at a rate of 30 L/sec. the out flow from the tank to the high pressure boilers is 30 L/sec. With time the quality of treatment water increased to 0.025 mg/L. Assuming that the inflow in to and out flow from the tank remains constant at 30 L/sec, calculate the time required for the silica content in the storage tank to increase to 0.01 mg/L.
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%
a) An activated sludge plant with recycle is evaluating its secondary clarification system. Settling column tests are conducted and analyzed for settling velocities at different initial solids concentrations. The data are provided below. The plant flow rate is 10,000 m3/d, with a recirculation ratio of 0.5. The MLSS in the reactor is 4000 mg/L. The desired underflow concentration is 17,000 mg/L. Solids concentration mg/L Settling velocity m/h 1500 6.5 3000 5.1 4500 4 6000 2.95 7500 2 9000 1.4 12,000 0.5 15,000 0.27 17,000 0.2 b) Design secondary clarifiers for the activated sludge plant of problem a), with a recycle ratio of 0.6. Calculate the required surface area if two clarifiers are used. Also calculate underflow rate, underflow velocity, and overflow rates. Clearly state your assumptions.
Given:Flow rate of water = 500 L/minSuspended solids concentration in influent water = 100 mg/LRequired effluent suspended solids concentration = 10 mg/LFiltration rate = 10 m^3/m^2/hrFiltration tank dimensions: Length = 5 m, Width = 3 m, Depth = 4 mCalculate:o Calculate the total suspended solids (TSS) load in the influent water:o Calculate the filtration tank surface area:o Calculate the required filtration tank capacity:o Calculate the required detention time in the filtration tank: Q2) DisinfectionGiven:Flow rate of water = 2000 m^3/hChlorine residual required in effluent = 0.5 mg/LInitial chlorine concentration in influent water = 2 mg/LChlorine decay rate in disinfection tank = 0.05 per hourDisinfection tank volume = 300 m^3Calculate:o Calculate the chlorine demand in the influent water:o Calculate the chlorine dosage required:o Calculate the chlorine dosage rate:o Calculate the actual chlorine dosage rate considering chlorine decay:
(a) A groundwater borehole at USM engineering campus contains 3000 mg/L of TDS. The flow is 0.32 m3 /s. The design TDS concentration of the product water is below 400 mg/L. The net pressure is 40 atm. The membrane manufacturer provides that the membrane has a water flux rate coefficient of 2.2 x 10-6 s/m and a solute mass transfer rate of 1.5 x 10-6 m/s. Calculate the membrane area required for the RO system. (B) A water treatment at Nibong Tebal receiving a raw water contains a concentration of 0.5 µg/m3 atrazine from Kerian River. In order to comply with the drinking water quality guideline, the treatment plant should reduce the concentration of Atrazine to 0.1 µg/L. If the dosing of powdered activated carbon have been applied before the coagulation, calculate the minimal dose of PAC in mg/m3 .
Given the required grout hydraulic head is 10 m, the head of the grout pipe is 1.5m above the ground. The injection point is at a depth of 4 m. The groundwater is 2m above the injection point. Calculate the required grout pressure.