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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's request is unfeasible.
what is the effect of temperature on compressive strength of concrete?
a wheel barrow is used to lift a 200lb load. the lenght from the wheel axle to the center of the load is 2ft. the length from the wheel and axle to the effort is 5 ft. illustrate and annotate the lever system.
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A water treatment plant with a maximum daily flow of 4.4 m3/s is treating surface water with a minimum ambient temperature of -1°C (30°F). The water is coagulated with alum and the alum floc was measured to have a settling velocity of 1.6 m/h at 1..
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Physics two skaters with masses of 65 kg and 45 kg, respectively stand 8.0 m apart each holding one end of a rope.
Biological treatment processes for wastewater can be catogarised as dispersed growth and attached growth systems. Discuss the advantages and disadvantages of attached growth systems over dispersed growth systems.
design a rectangular reinforced concrete beam (tension steel only) for the span and superimposed service loads shown. use f'c=5000psi and A615 grade 60 steel. LL=3.5 k/ft over the first 12 feet of the beam
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
Vehicles begin to arrive at a toll booth at eight vehicles per minute from 9 A.M. to 10 A.M. The booth opens at 9:10 A.M. and services at a rate of ten vehicles per minute until 9:40 A.M. From 9:40 A.M. until 10 A.M.
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