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The municipal wastewater treatment process for a hypothetiical town consists of two separate lagoons being operated in series. The first lagoon has a volume of 4 million gallons, while the second lagoon has a volume of 2.5 million gallons. Average flow into the first lagoon is 650,000 gallons/day. The concentration of BOD (material to be degraded) in the infuent is 175 mg/L, and its concentration in such a system has been observed to decrease according to first-order kinetics with a rate constant of 0.25/day. Presume that both lagoons can be considered well-mixed and to be operating at steady state.
(a) Find the BOD concentrations at the outlet of both lagoons.
(b) If the NPDES permit specifies an outlet BOD of 40 mg/L, might this lagoon system be meeting requirements?
Vehicles begin to arrive at a toll booth at 850 am with an arrival rate of x(t) = 4.1 + .01t (with t in min and x(t) in veh /min.) The toll booth opens at 9am and processes vehicles at a rate of 12 per minute throughout the day. Assuming D/D/1 que..
A total of 13,610 kg/h of air at 1 atm abs pressure and 15.6C is to be heated by passing over a bank of tubes in which steam at 100C is condensing. The tubes are 12.7mm OD, 0.61 m long, and arranged in-line in a square pattern with Sp=Sn= 19.05mm.
A distance of 1000 feet is to be taped in a manner to ensure a standard deviation smaller than ±0.06 feet. What must be the standard deviation per 100-ft tape length to achieve the desired precision?
inability and green engineering can be integrated in the four components of materials science and engineering?
how many cubic feet of seawater, density 60 lb/ft^3, must be processed to recover 1 ton of magnesium, 1,272 ppm?
A piston-cylinder contains 40 kg water of which 20 kg is saturated liquid. The equilibrium pressure of the system is 100 kPa. a) Find the system initial volume b) The water undergoes an isothermal expansion until the pressure reaches 10 kPa.
this cuts it down to a single force that you have to solve for, regardless of what type of member it is. Prove that the forces are equal and that the lines of action are along an angle theta. HINT: Use to do equations of equilibrium.
The ball is released from position A and drops 0.75m to the incline. If the coefficient of resistitution in the impact is e=0.85, determine the slant range R. See Engineering Mechanics Dynamics meriam and Kraige 7th edition number 3/255 for figure
a closed tank contains two straified non misicble fluid layers and compressed air. the fluid of the tank is saline water (relative density 1.036) with a total depth of 3.5m. the top fluid layer is oil (relative density of 08.2) with a depth of 0.6..
The velocity of a body is given by v(t) = 2t+t3. The body starts from rest at time t = 0 at position s(0) = (2,-10). What are the position and acceleration of the body as functions of time At what time, t, does the body cross the X-axis
A proposal has been submitted to replace a group of assembly workers, each working individually, with an assembly line. The following table gives the individual work elements. The demand rate for this job is 1600 units/week (assume 40h/week)
A wastewater treatment plant must disinfect its effluent before discharging the wastewater to a near-by stream. The wastewater contains 4.5*105 fecal coliform colony-forming units (CFU) per liter.
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