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A sedimentation basin is used to remove suspended solids from a wastewater. The rate of flow of wastewater into the tank is 10 L/s, and the influent concentration of suspended solids is 200 mg/L. The removal efficiency of the settling tank for suspended solids is 60%. Calculate the amount of suspended solids (sludge) accumulating in the sludge zone each day. You may assume that the amount of water withdrawn when pumping out the sludge from the sludge zone is very small compared to the inflow of wastewater to the tank and can therefore be ignored.
A concrete mix with a 3 inch slump, w/c ratio of 0.50, and sand with a fineness modulus of 2.4 contains 1.700 lb/yd^3 of coarse aggregate. Compute the required weight of coarse aggregate per cubic yard.
Many years ago, well-known architect Frank Lloyd Wright designed a mile-high skyscraper, which has never been built.
A nuclear facility in a coastal region is built to withstand ocean wave forces. Suppose the annual maximum wave height of the ocean waves (above the sea level) is a lognormal random variable with mean height of 4.0 meters and a c.o.v. of 0.8
At steady state air enters a turbine at a pressure of 0.4 MPa and a temperature of 77C. As a result the turbine generates 80 kJ of work per kg of air flowing. The air exits the turbine at a pressure of 1 bar.
A tape is calibrated and found to measure 100.04ft between the 0- and 100-ft marks. What measurements should be laid out to establish a horizontal distance of 682.25ft?
Determine the moment of inertia of the beam's cross-sectional area about the x-axis. Set a = 40mm , b = 130mm , d = 110mm , h = 380mm .
Over the past 3 years, there have been 14, 13, and 15 crashes on this section of College Street. The two-way ADT on this section is 16,474 vehicles per day. What is the annual crash rate for this section of College Street
Earth whose in situ weight is 110 lb per cf and compacted weight is 124 lb per cf is placed ina a fill at rate of 280 cy per hr, measured as compacted earth. The thickness of the compacted layers is 8 in.
A log that is 2 ft in diameter is to be cut into a rectangular section for use as a simply supported beam. The material is wood select structural grade (Douglas Fir) with a specific gravity of 0.017 lb/in3.
the path of particle p ios the elipse difined by relations r=2/(2-cosPIEt) and theta=PIEt, where r is exspressed in meters , tis in seconds nd thet is in radians. Determine the velocity and the acceleration of the particle whern t=0 seconds
A simple steam power plant operates at steady state with water circulating through the components with a mass flow rate of 100 kg/s. Stray heat transfer, kinetic energy and potential energy effects are negligible.
A light bar AD is suspended from cableS and supports a 20 kg block at C. The extremities A and D of the bar are in contact with frictionless, vertical walls. Determine the tension in cable BE and the reactions A and D
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