The flow-rate into a lake will be 3,000,000,000 liters per day and flow-rate out is 3,000,000,000 liters per day. The concentration of contaminant in the water flowing in is 0.0001mg/L. The initial volume of the lake is 737,040,000,000 million liters with a current mercury concentration of 0.8 mg/Liter of water. How much time until contaminant levels to drop to 0.0005mg / Liter once the dams have been opened to full capacity. (Assume evaporations rates, ground water recharge nor other environmental conditions do not affect your model.)
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- X=0 C = 6 mg/L at X=? A wastewater treatment plant discharges to a stream at X-0 as shown above. At the mixing point, the dissolved oxygen in the stream is 2.0 mg/L, which is too low for fish. They want a minimum of 6 mg/L. If the gas transfer coefficient is 0.4/day and the stream velocity is 3.6 mi/d, at what point downstream (X) will the DO be 6 mg/L? Assume the saturation concentration is 11 mg/L. (Hint: This is a plug flow reactor. In lab you did your measurements on a batch reactor, but remember that PFRS and batch reactors act the same mathematically.) Answer to one decimal place.A wastewater treatment plant discharges 20,000 m3/d of treated sewage into a river. The effluent’s BOD is 25.0 mg/L. The river’s flow and velocity are 5,500 m3/d and 23 km/hr, respectively. At the point of the effluent discharge, the river’s BOD and DO are 2 mg/L and 6 mg/L, respectively. The river’s water temperature is 25 °C. The deoxygenation coefficient, kd, was determined to be 0.45 day-1, and the reaeration coefficient, kr, is 0.52 day-1. Apply the plug flow model assumptions and calculate the the oxygen deficit at the point of the effluent discharge, the BOD at the point of the effluent discharge, the critical time and distance and minimum DO level.The figure below shows a flow net under a concrete dam. H1 H3 Toe filter H2 21 m 21 m (a)ifk = 5x107 m/s, calculate the seepage under the dam in mlyr/m. (Use the values of H1, H2 and H3 from the tables below corresponding to your University ID).
- Assume the described is at steady state. A fluid goes up to an aquifer that has groundwater and a chloride concentration of zero. The groundwater reservoir is 20,000 m^3 and has an outflow of 2 m^3/hour. If the fluid has a chloride concentration of 0.04 M and the aquifer outflow has 0.0084 M, how much chloride is precipitated in the reservoir? Any missing chloride is due to chemical reaction consumption.JUTHM Example 1.4 The storage capacity in a reservoir at certain period is given as 9.5 ha-m. The inflow and outflow of reservoir is recorded as 25 m³/s and 16.5 m³/s, respectively. However, the inflow and outflow is changed to 20 m³/s and 22 m3/s, respectively after four (4) hours. (a) Calculate change of storage capacity in the reservoir during the four hours period. (a) Calculate total storage at the end of four hours Give answers in cubic-meter.An open cylindrical tank 800mm in diameter and 2000mm high contains water to a depth of 1.6m. It is rotated about its vertical axis at 13 rad/s. How many liters of water are spilled? Use density of water as 1000kg/m3 and specific weight as 9.81kN/m3
- You are investigating the water quality of a river with an average velocity of 30 m/min and a sewage discharge which impacts the dissolved oxygen in the river. It is linear and regular for a length of 100 miles, except there is a small waterfall 10 miles downstream of discharge. At the waterfall, the oxygen deficit falls back to zero. The load to the river is 20 mg/L. The de-oxygenation rate coefficient (kj) is 0.3 day' and the re-aeration rate coefficient (k.) is 0.5 day'. If the initial oxygen deficit is 0 mg/L and oxygen saturation is 8 mg/L, what is the minimum concentration seen in the river? Answer: 2.78 mg/LAs the project engineer for your consulting firm, you are in charge of designing a flocculation tank to treat municipal drinking water. The design flow for the plant is 0.050 m3/s. The average water temperature is 10oC. The following design assumptions for the flocculation basin have been made:Number of tanks = 1Number of compartments in tank: 3Tapered G in 3 compartments: 60, 50, and 20 s-1Detention time = 30 min for entire flocculation basinDepth = 3 mTanks will have a square compartment plan (overhead) view1 Horizontal shaft paddle wheel per axis will be usedPaddle wheels will have 4 arms and 2 blades/armPaddle blades are 3 m long by 0.6 m wide. Assume blade spacing (diameter) of 1 and 2 m. Design the flocculation tank by providing the following for the first two compartments only:a) Tank and compartment dimensions in mb) Water power input in kWc) Rotational speed of the paddle wheel shaft in rpmThe volume of ocean water is 1338x10^6 km^3. The runoff from rivers is 44.7x10^3 km^3/year and the runoff from groundwater is 2.2x10^3 km^3/year. The precipitation on the ocean is 1270mm/year (The ocean area is 361.3x10^6 km^2). Estimate the residence time of water molecules in the ocean (in years).
- A 15 kW centrifugal pump working at 75% efficiency, is pumping a liquid of unit weight 10000 N/cum through an additional head of 10 m, what is the discharge in cum/s ?In a wastewater treatment plant, the supply of oxygen supply is 073 kgO2/h is necessary underoperating conditions, using a mechanical aeration system. Calculate theStandard Oxygen Transfer Rate. Using relevant data: Liquid temperature: T = 23 ◦C, Altitude = 1000 m, DO concentration to be maintained in the liquid CL = 1.5 mg/L, α = 0.90, β = 0.95, θ = 1.024 (Note: calculate the required value if it is missing)Homework 6- The monthly flows of a river during a critical period are tabulated below. Determine the active storage capacity of a reservoir ( as x10° m’) to be constructed on this river. a) for 100% regulation. b) for 10.5 m/s water supply for each month in June, July, August and September and 7.5 m'/s water supply for each month in the others. Month | O N J F M A M J J A S Q 10 (m³/s) 3 10 6. 14 15 6 6. 10 9. 4 9