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Raw primary sludge at a solids concentration of 3% is mixed with waste activated sludge at a solids concentration of 6,000 ppm. The flows are 20 and 25 gal/min, respectively. What is the resulting solids concentration? This mixture is next thickened to a solids concentration of 80,000mg/L solids. What are the quantities ( in gallons per minute)of the thickened sludge and thickener overflow (water) produced ? Assume perfect solids capture in the thickener. Also, draw a blackbox diagram for this problem. Show all work
Describe the problem of lack of coordination between design and construction in a traditional contract. In agency CM,what expertise does the CM provide during the pre-design and design phase.
Provide a reasonable design for a 99.4% efficient ESP treating 30,000 m^3/min of gas. The dust has a resistivity of 7.1 (10)^10 ohm-cm. Specify the total plate area, channel width, number and size of plates
For the case of the uniaxial compression, determine the maximum shear stresses that exist at that piont. Identify the planes on which they act by drawing the orientation of the element for these shear stresses. Show all stresses that act on the eleme..
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
A sample of moist soil has a volume of 40.5 cc mass weight of 59.2 gms. After drying it has a mass weight of 48.3 grams. The specific gravity of the solids are 2.68.
Find the expanded depth of the bed after the backwash when initial depth of the bed is 3 ft using given conditions. m = 0.01g/cm/sec, T = 25oC, rs = 2.65, r=1, washrate = 1.5 cm/sec, ks2 = 196.
Using the USLE, estimate the annual erosion from a 100 ha. forested watershed assuming the following: R =112 tonnes/ha/year. The forest is in fair condition with 40% cover; Average slope is 3%; The soils are clay loam in hydrologic group C.
Consider a 75-ft wide overflow spillway with no piers and a design head of 18 ft. The crest elevation of the spillway is 2400 ft and the streambed elevation just upstream of the spillway is 2350 ft.
Determine the service flow rate with a level of service B for asection of 4-lane freeway (2 lanes in each direction) with 10-ftlanes and obstructions 4 feet from the traveled pavement on oneside of the roadway. The section has a 5% grade 0.95 miles l..
A continuous distillation column containing plates is required to distil a 46% w/w ethanol (C2H5OH) in water solution. The overhead product must contain 91 % w/w ethanol and the bottom product 5 % w/w ethanol.
What is the Distribution reinforcement percentage of area ? Hot to take it for the calculation of distribution reinforcement in dog-legged stair case.
The cables A and B exert forces FA and FB on the hook. The magnitude of FA is 100 lb. The tension in cable B has been adjusted so that the resultant of the two forces is oriented perpendicular to the wall to which the hook is attached.
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