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A two-stage trickling filter plant treats 291.7 m3/h of municipal wastewater that has a BOD5 of 200 mg/L. The two filters have equal dimensions (depth = 1.68 m; diameter = 21.3 m), and each has a recycle ratio of 1.0. If the primary clarifier removes 33% of the BOD,
(a) Find the BOD5 of the final effluent using the NRC equation.
(b) Calculate the hydraulic loading and the organic loading for each filter.
When the pressure drops across the basket strainer by half(i.e., to 0.5 bar after the strainer)at the 100 m3/hr flow rate, itis removed for cleaning. What is the local loss coefficient of thebasket strainer at this point
Assume that the sewer flow and the stream flow are completely mixed, that the salt is a conservative substance (it does not react), and that the system is at steady state.
Determine the number of gallons of paint needed to paint the outside surface of the water-supply tank, which consists of a hemispherical bottom, cylindrical sides, and a conical top. Each gallon of paint can cover 250 ft^2
A piston-cylinder device initially contains 1.4 kg saturatedliquid water at 200 C. Now heat is transferred to the wateruntil the volume quadruples, and the cylinder contains saturatedvapor only
The canal shown below is to be widened so that it can carry twice the amount of water. Determine the additional width L required if all other parameters (i.e. flow depth, bottom slope, surface material, side slope) are to remain the same.
what is the definition of critical state. explain at which stage a critical state may be approached in a drained triaxial text on a overconsolidated clay using stress path and strain-strain plot.
A tracer study was conducted to assess groundwater velocity and showed that a slug of a conservative tracer took 34 days to travel the 10-m distance between two wells.
The potentiometric surface elevations at two observation wells 1000 m apart are 52.35 m and 56.90 m. If the horizontal hydraulic conductivity of the auquifer is 25 m/ day determine the flow rate per unit width of the auquifer.
Locate the image using both the spherical mirror equation and a ray diagram and identify if it is real or virtual, upright or inverted, and smaller or larger.
calculate the required compressive strength for a concrete mix design if f'c = 5000 psi and data indicate a standard deviation of 600 psi based on 15 tests for a similar concrete mix.
During a hot air balloon race one specific balloon, initially at rest, accelerate vertically upward at a constant rate of a=4.5 ft/s^2 when t0=42 s from the ground the surface, which is at an altitude above mean sea level of s0=3750 ft.
Using the Hazen-Williams approach (seecoefficient table below), find the headloss of water flowingthrough 1,000-ft of 6-ft diameter concrete pipe at a flow rate (Q)of 80 ft3/sec
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