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A lagoon with volume 1200 m3 has been receiving a steady flow of a conservative waste at a rate of 100 m3/day for a long enough time to assume that steady-state conditions apply. The waste entering the lagoon has a concentration of 10 mg/L. Assuming completely mixed conditions:
(a) What would be the concentration of pollutant leaving the lagoon?
(b) If the input waste concentration suddenly increased to 100 mg/L, what would the concentration in the effluent be 7 days later?
(c) Same questions for a non conservative pollutant with rate constant k= 0.2/day
determine diameter of 200 m section commercial steel pipe (darcy's friction factor f = 0.0115) that carries a flow of 0.24 m^3/s and allowable head loss ove the section is 3.5 m.
Suppose 2.3 g/day of vinyl chloride, with a half-life of 1 day, leaks into a 20,000 m3 pond. Suppose an adult obtains his drinking water from the pond and consumes the water daily for 7 years
The river channel itself is 20m wide and flow depth is 5m and the sandy bottom has an n=0.02, the left bank is 40m wide and the flow depth is 0.5m, while the right bank is 100m wide with a flow depth of 1m.
A microwave oven has a rotating plate for uniform cooking. The plate takes 8 seconds to complete one revolution and is driven by three rollers.
A rectangular channel is 25ft wide and has a flow of 500 cfs at a velocity of 5ft/s. (a) Determine the specifc energy of water in the channel. (b) What is the criticl depth of water in the channel (c) What is the critical velocity
If the stage of a stream increases by 40% and the slope of the water surface becomes half of its original slope, then what will be changes in discharge of the stream?
The velocity of the center point of the wheel is constant at 20 ft/sec to the right. For the instant, determine the following: a) The velocity and acceleration of point B (which is attached to the wheel) measured with respect to ground.
An 180 m long 100 mm diameter compressed air pipeline is to be run from a stationary compressor to an air-track drill which requires a flow of 780 l/sec. The pipeline contains 2 large radius bends (R=2d) ,and 4 half closed gate valves.
In the field, if the relative compaction is 90%, determine the hydraulic conductivity of the sand in the field compaction condition (given that k for the sand at the maximum dry density condition is .040 cm/sec and Gs = 2.65).
A 1.2-in. rainfall occurs in a 6-hour duration. If this represents an exceedence probability of 10%, what is the probability it will be equaled or exceeded at least once in the next 3 years. What is the probability it will be equaled or exceeded e..
A certain gas has a molecular mass of 40. It is under a pressure of 2.5atm and a temperatature of 25 Degree Celsius. Determine its density and pressure in CGS absolute units.
Three completely mixed stabilization ponds are connected in series, and the system removes 99.998% from the total coliform count of the influent to the first pond. In stabilization ponds, coliform bacteria are removed by a first-order process
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