Hydraulic detention time, Mechanical Engineering

a.The closest point to discharge treated effluent is a lake, but the pipeline is extended so it discharges into the river draining the lake. This allows a conventional secondary treatment level (Table 11-6) and not be required to also reduce NH3, TKN and P, as per Table 11-7. Explain why the difference in receiving waters affects the treatment required.

b. Influent wastewater SS or TSS = 220 mg/l. Primary sedimentation removes 60% of it. The sludge has 6% solids. Calculate the daily volume (liters) and dry solids weight (kg) of primary sludge.

c. The hydraulic detention time F/M= 4 hours, the overflow or surface settling rate is v0 =500 gpd/ft2. Compute the volume and depth of the sedimentation tank.

d. Say the organic SS particles have specific gravity Gs = 1.1. The inorganic SS particles have Gs= 2.65. For which type of material are the removed particles of larger diameter? Illustrate by formula.

e. Activated sludge treatment is used. 2.0 mgd inflow to the aerobic reactor has 100 mg/l BOD5 (So). How many pounds of air at 20% O2 must be transferred into the wastewater each day?

f. Using same F = Q x So, it's desired to keep F/M= 0.2 in the 40,000 ft3tank. Find the desired X (VSS concentration) that must be maintained. Sketch the system used to keep reactor aerated, mixed, and at X.

g. The microorganisms doing the treatment are endogenous, chemheterotrophs Explain what each of these descriptors of metabolism means.

h. The COHNS substrate includes both VS and FS content. What are the 3 possible fates? Yield = 40%. If its 100% degraded (just VS), how many moles of CO2 are produced per mole substrate?

i. Primary & secondary sludge are blended and anaerobically digested in a closed tank for θ = 20 days to reduce VSS. How does this help the plant to be energy self-sufficient?

Posted Date: 3/2/2013 6:25:23 AM | Location : United States







Related Discussions:- Hydraulic detention time, Assignment Help, Ask Question on Hydraulic detention time, Get Answer, Expert's Help, Hydraulic detention time Discussions

Write discussion on Hydraulic detention time
Your posts are moderated
Related Questions
Equation for principal stresses and principal planes: Derive equation for principal stresses and principal planes for the element subjected to compound stresses. Sol.:

Determine the stresses in the shell: A cylindrical boiler is 2.5 m in diameter and 20 mm in thickness and it carries steam at a pressure of 1.0 N/mm2. Determine the stresses i

Evaluate an expression for minimum number of teeth on the wheel if interference is to be avoided between two mating gears. Also determine the above expression if gear ratio is equa

Q. What do you mean by Risers and Downcomers? Risers and downcomers shall be staggered along the shell of the WHB and steam drum for uniform water/steam circulation in the syst

write the conservation of mass for steady flow throught a streamtube with asingal one dimensional inlet 1and exit 2

Angle of Repose(α): It is the maximum angle of inclined plane on which body tends to move down the plane because of its own weight. Consider the equilibrium of body when body

Formula for maximum power transmitted by belt: Derive formula for maximum power transmitted by belt when centrifugal tension is considered. Sol: Let T 1  = Tension on

Describe the Mechanics of orthogonal cutting. What is chip thickness ratio and formulae for it ? Explain Shear angle relationship based on Merchant's minimum cutting energy prin

EQUIPMENT FOR RESISTANCE WELDING-Measurements Measurement of the parameters are important while fixing the parameters or testing a machine. Resistance welding instrumentation s

Thermodynamic equilibrium - Thermodynamics: Equilibrium is the state of a system in which the state does not undergo any change in itself with the passage of time without the