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a completely mixed activated sludge plant is to treat 10,000 m^3\day. the wastwater has a BOD5 of 1200 mg\liter that must be reduced to 200 mg\liter.if the mean cell residence time 5 days and suspended solids concentration of 5000 mg\liter and Y 0.7 kg\kg and kd 0.03 \day determine sludge recycle ratio R?
in an air standard otto cycle , the air at the beginning of the compression stroke is at 95 kpa and 22c ,and the cylinder volume is 0.0028 m^3 . the compression ratio is 9 and 4.3 kj are added during the heat addition process
You have been hired to do a survey to search for old tunnels that are rumored to be in the area, previously used to smuggle people across the US-Mexico border. The tunnels are not expected to be exceptionally deep underground.
The concentration of Chemical Oxygen Demand (COD) in the effluent from this system is 25 mg L-1. The growth rate of the organisms in this case is 0.9 days-1. The activated sludge tank has a volume of 50 m3 and the flow rate through it is 500 m3 da..
One method of removing phosphate from wastewater effluents is to precipitate it with aluminum sulfate. A plausible stoichiometry (but not exact because aluminum and phosphate can form many different chemical materials) is
Iron and vanadium both have the BCC crystal structure, and V forms a substitutional solid structure in Fe for concentrations up to approximately 20 wt% V at room temperature.
What is the average length of queue, the average time spent in the system, and the average waiting time in the queue?
A structural element subjected to cyclic loading is made of fc' = 3000 psi concrete. Compressive stresses are changing between 2200 psi and 1600 psi. The frequency of loading is 8 Hz.
This distance is indicated correctly on a steel surveyor's tape whenused at a temperature of 70 degrees F and subjected to a pull of 10lbs. If in measuring a certain distance the tape indicatesthe distance to be 100 feet
The torsional assembly consists of a solid bronze [G = 49 GPa] segment (1) with diameter d1 = 90 mm securely connected at flange B to solid stainless steel [G = 89 GPa] segments (2) and (3), with diameter d = 100 mm.
The relative roughness ofa pipe is 0.0005, if the blasius equation is applicable for Thecflow Reynolds number above 2700 rather then 3000
Write a MATLAB program that loads the sensor_new.dat file. The sensor readings were actually taken every second over a period from 0 to 19 seconds. Create a time vector going from 0 to 19 in 1 second increments.
A stream with a flow of 22 mgd contains 180 mg/L of sodium cyanide in the form of NaCN. Chlorine can be added to destroy the NaCN waste according to the reaction shown below. Find the theoretical minimum amount of chlorine required (in lb/day).
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