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A complete mix activated sludge plant operates at design Q, with the reactor tank volume set by a nominal residence time of 6 hours..
a) It was anticipated that it would operate at 25% RAS for an expected Xr= 2,000 mg/l. What would the actual residence time be?
b) The secondary clarifier only produces Xr= 1,000 mg/l, so RAS is increased to 50% Q. What is the actual residence time then? Does the F/M, the MLVSS concentration and SRT change?
c) The secondary clarifier actually produces 3,000 mg/l Xr, but RAS stays at 25% as originally planned. Do F/M, MLVSS and SRT change from what was planned?
An 18 in. newriveted steel pipe 1000 ft long runs from elevation 150 ft toelevation 200 ft. If the pressure at elevation 150 ft is 100 psiand at elevation 200 ft is 72 psi, what flowrate can be expectedthrough the line? (use e = 0.003 ft)
A W16 x 36 simply supported beam is 30 ft long and supports auniform dead load of 970 lb/ft, a roof live load of 240 lb/ft and asnow load of 270 lb/ft. Is this beam adequate to support the load
Convert a stress of 4500 Newtons per square millimeter to kipsper square foot. Use complete and utterly perfect unit analysismethods. Do one one calculation line.
(a) Use differentiation to find a general expression for the rocket's velocity as a function of time, (b) When is the velocity zero?
You have been hired to plan and build a subdivision on the volcanic island of Hawaii. As you know, this island is made of several shielf volcanoes. A) List the volcanic hazards associated with shield volcanoes.
For a given stockpile of aggregate, do you think the unit weight of the aggregate is a constant? please provide a clear and concise explanation
Force P is directed from point A(5,10,3) towards point B(1,-2,5) and has a magnitude of 15N. Vector Q=6i+2j-5k. When finding the projection of P onto Q what do you do with the 15N
To provide knowledge and practice AutoCAD software package for engineering activities.
At the proportional limit, . gage length of a -diameter alloy rod has elongated . and the diameter has been reduced . The total tension force on the rod was . Determine the following properties of the material
Consider a beam of length 1.5L(meters) with hinge support and roller support from both the ends (respectively left and right) at distance of L/4. The beam is subjected to triangular loading from 0 to q KNper meter.(left to right)
If the normal stresses in the x and y direction are given byσx and σy, find the normal strains in these two directions.
If a truck has a capacity of 24m^3 (Heaped) and 18m^3 (struck), with a total empty weight of 31600kg (truck), and needs to move soil at a density of 1850kg.m^3 (Bank) with a swell of 41%
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