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An activated sludge system operates at a flow rate (Q) of 400 m3/day with an incoming BOD (So) of 300 mg/L. Throughout pilot plant work, the kinetic constants for this system are determined to be Y = 0.5 kg SS/kg BOD, Ks = 200 mg/L, d = 2/day. The volume of tank is 51.6 m3. A solids concentration of 4,000 mg/L in the aeration tank is considered appropriate and the sludge age (or mean cell residence time, MCRT) is 3.8 days. A treatment system must be designed that will produce an effluent BOD of 30 mg/L (90% removal).Determine (a) the hydraulic retention time (b) the quantity of sludge wasted daily (c ) the F/M ratio
Consider a cold worked C11000 copper alloy rod 21 mm in diameter and 250 mm in length. Calculate (a) the maximum tensile load, in N, and (b) the maximum length, in mm, to which the rod may be stretched without plastic deformation.
A pig farmer owns a 20-arce farm and started business with 22.1 pigs. After one year, he has 319 pigs. Assuming a constant growth rate, what is the doubling time in units of days.
A stratified lake could be idealized as two layers: with 7.0 m of fresh water on top and 10.0 m of cold water (specific gravity = 1.02) on the bottom. What are the pressure heads at the interface and at the bottom of the lake, in terms of water col..
Create a function called [polygon] that draws a polygon in a polar plot. Your function should have a single input paramter - the number of sides.
find the net present worth of the project,and the internal rate of return ,and the annual worth of the project?
Structural design of reinforced cast in - place concrete - Structure design
Air can be assumed as a di-atomic ideal gas. Find the final temperature and the amount of work ( in kW) required for air compression at a rate of 100 mol/s , from an initial condition of 1 bar an 25 C to 10 bar; for the following ways:
What are the effects of water pollution on the components of the hydrologic cycle?
A circular bar of magnesiuen alloy is 750 mm long. The bar is loaded in tension to an elongation of 6.0 mm, and the load is removed. (a) what is the permanent set of the bar (b) if the bar is reloaded, what is the proportional limit
A corporation issues a new 10 year bond that has a coupon rate of 4.65% with quarterly dividend payments. Alex purchases 200 of these bonds at a price of $98.75, for a total investment of $19,750. Assuming he holds them to maturity, what will be..
Water enters a two-armed lawn sprinkler along the vertical axis (normal to the page) at a rate of 80 L/s and leaves the sprinkler nozzles as 1.5-cm diameter jets at an angle of from the tangential direction.
The long-term average January precipitation in the Colorado River basin is 1.11 inches, with a standard deviation of 0.60 inches. Assuming a normal distribution, what is the probability that less than 0.5 inches of precipitation will occur in any ..
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