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Two shallow lagoons connected in series, each having a surface area of 5 km^2 and depth of 1m, are receiving 8640 m^3/day of sewage containing 100mg/L of biodegradable contaminant. At a steady state, the concetnration of the contaminant in the effluent from the second lagoon must not exceed 20 mg/L. Assuming the lagoons are well mixed and that there are no losses or gains of water in the lagoon other than the sewage input, what biodegradation reaction rate coefficient (in day^-1) must be achieved for a first order reaction that governs the degradation of the contaminant
The particles have an effective drift velocity of 10.0 cm/s. Specify the total plate area, channel width, number and size of plates, number of electrical sections (total and in direction of flow), and total corona power to be supplied, and estimat..
Two kilograms of steam at 300kPa and a quality of 75% are heated in a closed container until a pressure of 600kPA is reached. Determine the final temperature of the steam and the heat input.
If water at 70 degrees C (row=1.94 slugs/ft^3, vapor pressue= 0.363psia) is used in a simple barometer what is the height of the column of water if the atmospheric pressure is 15 psia
The maximum hoop stress is (65000/2) psi and the maximum shear stress is 16000 psi. If the diameter of the tank is 7 inches,what is the minimum wall thickness.
A normally consolidated clay layer is 4 m thick (one way drainage). From the application of a given pressure, the total anticipated primary consolidation settlement will be 80mm. What is the average degree of consolidation for the clay layer.
Assume that an egg can be hatched only in the week after it is laid. Otherwise it must be saved and sold for 10 cents. Assume that there are no eggs available for hatching in the first week.
For a groundwater hydrology problem, if you have an unconfined aquifer, and someone inserts an impermeable wall into the middle of it (a wall that starts at the bottom and does not stretch the full height of the aquifer),
Base course aggregate has a target dry density of 119.7 lb/cu ft in place. It will be laid down and compacted in a rectangular street repair area of 2000 ft*48ft*6in.
Trapezoidal channel is to be excavated in alluvial material on a bed slope of 1:10000. The side slopes will be 1(vertical) : 2(horizontal). Details of the bed material are as follows:
Design a parshall flume to handle 24mgd in a 10ft wide channel at a downstream depth of 3 ft. If the channel floor is at elevation 65.7ft, what is the water elevation upstream of the flume
A completely reversible heat engine uses a solar receiver for a hightemperature reservoir and a lake for a low temperature reservoir. The sun maintains the receiver surface at 290 ° F while the lake remains at 40 °F.
Water flows into and out of a 5 liter tank at a rate of 1 L/min. Within the tank, the mineral apatite is dissolving at a rate of 3x10^-10 moles of Si per m^2 per sec. If the tank contains 10g of the apatite with a specific surface area of 2 m^2/g,
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