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Two towns, located directly across from each other, operate municipal wastewater treatment plants situated along a river. The river flow is 50 million gal. per day (50 MGD). Coliform counts are used as a measure to determine a water%u2019s ability to transmit disease to humans. The coliform count in the river upstream of the two treatment plants is 3 coliforms/100 mL. Town 1 discharges 3 MGD of wastewater with a coliform count of 50 coliforms/100 mL, and town 2 discharges 10 MGD of wastewater with a coliform count of 20 coliforms/100 mL. Assume the state requires the downstream coliform count not exceed 5 coliforms/100 mL.
a) Is the state water-quality standard being met downstream? (Assume coliforms do not die by the time they are measured downstream.)
b) If the state standard downstream is not met, the state has informed town 1 that it must treat its sewage further so the downstream standard is met. Use a mass balance approach to show that the state%u2019s request is unfeasible.
A particle of mass 200kg is lifted up vertically by a force of 104N. Assuming the acceleration due to gravity is 10meterper.secondsquare, write a program to calculate the upward acceleration of the particle.
a hollow steel shaft with an outside diameter of 400 mm and inside diameter of 300mm is subjected to the torque of 300 Kn. The modulus of rigidity for the steel is 80 GPa.
A 40-cm straight pipe is used to carry water at 20 degrees C from resevoir A to resevoir B that is 0.7 km away. There is an elevation difference of 9-m between the two resevoirs. Determine the discharge for
A pipeline 1200 ft long and 8 in. in diameter has at its inlet point 75ft of available hydraulic energy with respect to the reference level. The velocity in the pipe is 5 fps: the pressure at its end is 12psi.
A pickup truck has a width of 78.7 in. Ifit is traveling north at 39 m/s through amagnetic field with vertical component of 32 µT, what magnitude emf is induced between the driver and passenger sides of the truck
Two triaxial tests were performed on two prepared samples of the same limestone. At a confining pressure of 2000 psi, the first sample failed at 9000 psi. Then at a confining pressure of 5000 psi
Briefly describe the simplest heat treatment procedure thatwould be used in converting a 0.76 wt% C steel from onemicrostructure to the other, as follows:
A town is installing a new 10” main to carry drinking water. The only section remaining to be installed is a segment through the middle of town. However, the excavators discover an archaeological site. The town decides to split the main into two sect..
A rural freeway has an ideal free-flow speed of 120 km/h and two 3.6 m lanes in each direction, with right shoulder lateral clearance of 1.2 m. Interchanges are spaced approximately 5 km apart. Traffic consists of 10 percent trucks and buses and 8..
given bulk density as 1300kg/cubic meter and field capacity as 22% by weight and permanent wilting point as 10% by weight calculate available water capacity.
For the eccentric shear loading of the accompanying figure, 7/8 inch diameter A325 bolts are used in two vertical lines in a bearing-type (A325-X) connection. The loading is 10 kips dead load and 30 kips live load.
A constant-head test was conducted on a sample of soil 15cm long and 60 cm^2 in cross-sectional area. The quantiities of water collected was 50 cm^3 in 20 seconds undera a head difference of 24 cm.
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