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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 round steel rod, 25 mm in diameter, subjected to a bending moment of 160 Nxm. calculate the maximum bending stress.
Although primary and secondary sedimentation is responsible for the removal of some BOD, you will design a bioreactor which removes 85% of BOD entering the plant using an activated sludge bioreactor. Use the following values: Influent (to bioreactor)..
A power plant situated 20 km directly upwind from a protected old-growth forest emits SO2 at a rate of 120 g s-1with an effective stack height of 100 m (uH= 2 m s-1). Environmentalists claim that the acidic deposition is damaging the valuable fore..
Barron Chemical uses a thermoplastic polymer to enhance the appearance of certain RV panels. The initial cost of one process was $130,000 with annual costs of $49,000 and revenues of $78,000 in year 1, increasing by $1000 per year
It takes $10,000 to put on a festival each year immediatly before this years festival the sponsoring committee finds that it has $40,000 in an account paying 15% interest compounded annualy after this year how many more festivals can be sponsored wi..
A stack (T=550 F and P=750 mmHg) was sampled using EPA Method 5. The total gas volume that flowed through the dry gas meter was 2.785 cubic meters (at T=60 F and P=800 mmHg).The mass of particles collected was 1.50 g.
What power must the pump supply to the system to pump the oil from the lower reservoir to the upper reservoir at a rate of .2 m^3/s. Sketch the HGL and the EGL for the system.
Identify the forces that work against the success of cladding systems in keeping the elements out.
The solid compound shaft, made of three di¤erent materials, carries the two torques shown. (a) Calculate the maximum shear stress in each material. (b) Find the angle of rotation of the free end of the shaft.
A precast concrete wall section is temporarily held by two cables as shown. Knowing the tension in cable BD is 900 N, determine the moment about point O of the force dxerted by the cable at B. Next determine the perpendicular distance from O to cable..
what size galvanized iron pipe (e=0.0005ft) is required to carry a flow of 5 cfs of water at 60 degrees F (v=1.217X10^-5) without exceeding a head loss of 5.0 ft/100ft of pipe
A wheeled tractor with high-pressure tires and weighing 74,946 lb is pulled up a 5% slope at uniform speed. If the tension in the tow cable is 13,000 lb, what is the rolling resistance of the road
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