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Determine the volume of three identical activated sludge tanks following primary clarification to aerate 36,000 m cubed/d with a BOD concentration of 180 mg/l at a BOD loading of 560 g/m cubed*d. What is the aeration time? For an F/M of 0.35, what MLSS concentration should be maintained in the aeration tanks?
Estimate the operating sludge age, assuming an effluent suspended solids of 30 mg/l and the daily amount of waste activated sludge solids. If the waste sludge has a concentration of 10000 mg/l, what is the calculated volume of sludge to be wasted each day?
Determine the dimensions of three identical rectangular clarifiers (length, width, and side water depth) with a 2:1 length to width ratio.
A soil specimen has a water content of 18% and a wet unit weight of 118.5 lb/cu. ft. The specific gravity of solids is found to be 2.72. Find the:
Find the settling velocity of a 20 µm diameter particle with density 1500 kg/m3. If this particle had been hurled to a height of 8,000 m during a volcanic eruption, estimate the time required to reach the ground
The potentiometric surface elevations at two observation wells 1000 m apart are 52.35 m and 56.90 m. If the horizontal hydraulic conductivity of the auquifer is 25 m/ day determine the flow rate per unit width of the auquifer.
The mine wants to change the hole diameter to 229 mm and needs a new drilling pattern that will not result in coarser fragmentation. For this exercise you can assume homogenous geology and no adverse effects due to geological structure.
Describe how test flumes and associated equipment are used to assess and confirm hydraulic behaviour in open channel
How do you propose to do this at the above treatment plant and estimate the head loss both immediately after backwash and 10 hours later, if the same water is applied at a rate of 2 L/s.m 2 .
A Waste water has been characterized for nitrogen-containing compounds and the TN was 26 mg N/L, the TKN was 14 mg N/L and nitrate was 27.3 mg NO3-/L. What is the potential theoretical oxygen demand (mg O2/L) associated
what is the force P to move the cabinet if a) caster A and B are locked b) B is locked A is free to move c) A is locked B is free to move p is applied from the left side pushing right. the width of the cabinet from caster a to b is 24 inches.
The 3.0-ft diameter piper is 3,400 feet long with a steady flow rate of 10,000 gal/minozone (in mg/L) should be Injected at the head of the piper so what there will be an ozone concentration of 1.0mg/L
a certain pesticide is fatal to fish fingerlings at a level of 0.5 parts per million in water. a leaking metal can
A bowling ball is dropped from a boat so that it strikes the surface of a lake with a speed of 25 ft/s. Assuming the ball experiences a downward acceleration of a = 10-9v2 when in the water, determine the velocity of the ball when it strikes the bott..
One issue is to calculate the "pooled" variance and "pooled" standard deviation. Since we expect that the variances of the improvement scores by both groups could be a bit different, we'd want an overall value that reflects the variance of both gr..
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