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1- The influent suspended solids concentration to a primary settling tank is 435mg/L. The average flow rate is 0.050m3/s. If the suspended solids removal efficiency is 60 percent, how many kilograms of suspended solids are removed in the primary settling tank each day?
2- The town of Camp Verde has been directed to upgrade its primary WWTP to a secondary plant that can meet an effluent standard of 25 mg/L BOD5 and 30 mg/L of suspended solids. They have selected a completely mixed activated sludge system for the upgrade. The existing primary treatment plant has a flowrate of 0.029m3/s. The effluent from the primary tank has a BOD5 of 240mg/L. Using the following assumptions, estimate the required volume of the aeration tank:(a). BOD5 of the effluent suspended solids is 70 percent of the allowable suspended solids concentration.(b). Growth constants values are estimated to be: Ks = 100mg/L BOD5; kd= 0.025 d-1; µm=10d-1; Y= 0.8 mg VSS/mg BOD5 removed.(c). The design MLVSS is 3000mg/L.
3- The 500- bed Lotta Hart Hospital has a small activated sludge plant to treat its wastewater. The average daily hospital discharge is 1500 L per day per bed, and the average soluble BOD5 after primary settling is 500 mg/L. The aeration tank has effective liquid dimensions of 10m wide by 10m long by 4.5m deep. The plant operating parameters areas follows:MLVSS =2500mg/LMLSS= 1.20 (MLVSS)Determine the following: aeration period, F/M ratio, SVI, solids concentration in return sludge.
A 0.20 kg stone attached to a 0.8 m long string is rotated in a horizontal plane. The string makes an angle of 25° with the horizontal. Determine the speed of the stone.
A structural steel beam is attached to a column with bolts. The downward force on the connection is 150 kips. What bolt sizes must be used if the allowable shear stress is 25.0 ksi
Calculate the precentage of carbon hydrogen and oxygen in ethanoic acid.
An airplane flies at a speed of 360 mph at an altitude of 5000 ft. If the boundary layers on the wing surfaces behave as those on a flat plate, estimate the extent of laminar boundary layer flow along the wing in feet.
The plant is to employ alum coagulation. and pertient data for the folcculation basin are as follows: detention time = 20 min, G = 35 /sec at 50F, GT = 10000 to 100000, width = 1.25 depth, length = 2width, no baffling, number of impellers = 2
The service live load is three times the dead load. The 4-in leg contains a single line of 7/8 inch diameter bolts, and the 6 inch leg contains a double gage line of 7/8 inch diameter bolts.
In a certain chemical plant, a closed tank contains ethyl alcohol to a depth of 50 ft. Air at a pressure of 25 psi fills the gap at the top of the tank. Determine the pressure at a closed valve attached to the tank 10 ft above its bottom.
A wheel has an initial clockwise angular velocity of 12 rad/s and a constant angular acceleration of 3 rad/s2. A) Determine the number of revolutions it must undergo to acquire a clockwise angular velocity of 15 rad/s.
A 10-year $2000 Bond with a coupon rate of 10% paid semi-annually is available for purchase. What is the maximum you would pay for this bond if your MARR (without inflation) is 6%, and you estimate an inflation rate of 3% annually
If rod slides along the horizontal slot with a velocity of 44 ft/s , determine the angular velocity of link BC at the instant
Two ships A and B are moving with constant speeds Va and Vb along straight intersecting courses. The navigator of ship B notes the time rates fo change of the separation distance r between the ships and the bearing angle theta.
A concrete mix with a 3-inch slump, w/c ratio of 0.50, and sand with a fine- ness modulus of 2.4 contains 1700 lb/yd3 of coarse aggregate. Compute the required weight of coarse aggregate per cubic yard.
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