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1.Compare the total reactor volume required for 90% removal of a substance that decays according to first-order kinetics with a rate constant of 0.05 day –1 in a CM system that contains a single reactor against a system that contains three CM reactors of equal volume in series.
2.An activated sludge plant is to be designed for a population of 4000 persons. The influent flow is 380 Lpcd and the influent BOD5 is 200 mg/L. Pertinent data are: Primary clarifier removes 33% of the influent BOD5, and the state regulatory agency allows a volumetric loading of 0.48 kg BOD5 /(m3.day). Determine the reactor basin volume.
A new machine will cost $25,000. The machine is expected to last 4 years and have no salvage value. If the interest rate is 12%, determine the return and the risk associated with the purchase.
Rope BCA passes through a pulley at point C and supports a crate at point A. Rope segment CD supports the pulley and is attached to an eye anchor embedded in a wall.
An important dimensionless parameter in certain types of fluid flow problems is the Froude number defined as V/(gl)^1/2 where V is a velocity, g the acceleration of gravity, and l a length
Each exerts a force of 600 N directed at a t= 20.0° anglerelative to the forward motion of the boat. If the boat moves withconstant velocity, find the resistive force exerted by the water on the boat.
A horizontal Curve is designed for a two lane mountainous terrain. The following data are known. intersection angle: 40 degrees tangent length: 436.76 ft Station on PI: 2700+10.65 fs=0.12 e=0.08
In the construction management, there is a lot of procurement route that are necessary and suitable for the construction industry.
Determine the vertical stress increment due to the strip load and the total pressure both at point 3 m below the center of the strip load.
What is the chemical name of the first hazardous air pollutant under Title III regarding the Clean Air Act
A plate is pulled upward from a pool of liquid with velocity, V, entering a thin liquid film on the surface of the plate. The flow is assumed to be laminar and the film thickness
A sailor is being rescued using a boatswain's chair that issuspended from a pulley that can roll freely on the support cableACB amd is pulled at a constant speed by cablle CD
A light rail transit agency operates trains over a 25-km long single-track line. During the peak period, it operates five trains at 15-min headway. Train travels at an average speed of 50 km/hr.
A liquid has the peculiar property that its mass density increases linearly with depth according to the expression p = p_water (1+0.01d) where d is the depth below the liquid surface in meters.
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