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Design a CSTR to provide pre-treatment for an industrial wastewater that flows at a rate of 1000 gpm (gallons per minute) with a phenol concentration of 200 mg/l. Phenol undergoes a first-order decay reaction in the CSTR with rate constant, k = 0.50 hr^-1. The current industrial pre-treatment permit for Phenol is 20 mg/l. The permit limitation may be changed, either higher or lower, in the future.
Determine the required CSTR volume, V (gallons), and hydraulic residence time, t = V/Q (hours), to comply with the current industrial pre-treatment permit limitation for phenol.
Plot a graph with CSTR effluent phenol concentration (mg/l) along the vertical axis as a function of CSTR hydraulic residence time, t (hours), on the horizontal axis for assessing the impact of changes in the permit limitation. Comment on a type of "Law of Diminishing Returns" on effluent phenol concentration versus 't' that applies to CSTR design for first-order decay reactions.
The owners wish to achieve an initial acceleration from rest of 22 ft/(sec^2) on a level paved surface. What is the minimum coefficient of road adhesion needed to achieve this acceleration
Assume that the sewer flow and the stream flow are completely mixed, that the salt is a conservative substance (it does not react), and that the system is at steady state.
The diaphragm is ruptured and fluid fills the entire volume of the vessel. Assume that the fluid is an ideal gas. After you have determined Qsub12, Wsub12, and delta U for the process, calculate the final temperature of the gas.
A bridge has cylindrical piers 1 m in diameter and spaced 15 m apart. Downstream of the bridge where the flow disturbance from the piers is no longer present, the flow depth is 2.9 m and the mean velocity is 2.5 m/s.
A construction company requires to know how much of additives A and B to use to prepare concrete to be used in a freezing environment (northern location). The concrete mix should contain a minimum concentration of nitrate and sulphate.
The scale of a spring balance reading from 0 to 235 N has a length of 13.0 cm. A fish hanging from the bottom of the spring oscillates....
Estimate the power needed to overcome the aerodynamic drag of a person who runs at a rate of 100 yds in 10 s in still air. repeat the calculations if the race is run into a 20-mph headwind: a 20-mph tail wind.
Determine the maximum and minimum stress intensities in the section.
Estimate the median and 90th percentile load of SS contained in the runoff. Note: COV = coefficient of variance
Design a parshall flume to handle 24mgd in a 10ft wide channel at a downstream depth of 3 ft. If the channel floor is at elevation 65.7ft, what is the water elevation upstream of the flume
a regular hexagonal pyramid has an upper base edge of 16 ft. and a lower base edge of 28 ft. if the volume of the frustum is 18041 ft^3., find the lateral area of the frustum.
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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