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Phenol is approximately 12 times more soluble in 1 volume of isopropyl ether than it is in 1 volume of water. How many extractions are required to decrease the concentration of phenol below 100 mg/L in a wastewater containing 2000 mg/L of phenol if an ether-to-watewater ratio of 0.2 by volume is used in each extraction?
Remember:
Kd = Ci, org. solvent / Ci, water = (molesi, org. solvent/Vorg. solvent) / (molesi, water/Vwater)
Indoor Air quality is greatly affected by Radon, which can cause lung cancer. When we moved to Colorado, we tested the house for Radon and installed a radon mitigation system.
A constant head permeability test was conducted on a clean sand sample. The diameter and length of the test specimen were 10 cm and 12 cm respectively.
Assuming a density of 120 lb/ft*3 for masonry brickwork,determine the maximum height of a brick wall if the allowable compressive stress is limited to 150 psi,and the brick is (a) four inches wide and (b) six inches wide.
Water at 120 celcius with a quality of 25 % has its temperature raised 20 celcius in a constant volume process. What is the new quality and pressure? Draw P-v and T-s diagrams.
Two shafts are made of the same material and are of equal lengths.one of them is solid and another one is hollow. the ratio ofinside and outside diameters for hollow shaft is 0.65. They are subjected to the same torque and same maximum shearstress. D..
A normally consolidated clay layer is 4 m thick (one way drainage). From the application of a given pressure, the total anticipated primary consolidation settlement will be 80mm. What is the average degree of consolidation for the clay layer.
The wastewater discharge flow rate is 0.3 m3/s. The coliform first-order death rate in seawater is approximated 0.3 h-1. The current carries the wastewater plume toward the beach at a rate of 0.5 m/s.
A concrete building has floor area 10 m by 20 m and is 4 m high. THe building has four windows with a height 1.6 m and a width 2 m. After 10 minutes gases in the room have an average temperature of 700 degree Celcius.
The vertical portion of the press shown below consists of rectangle tube of wall thickness t=8mm. knowing that the press has been tightened on wooden planks being glues together until P = 20 kN, determine the maximum tensil and compressive stresses i..
Coal has about 5% sulfur. How many pounds of sulphur would be emitted from coal-fired power plants in the united states in 3 years? (each year. U.S electricity production in about 0.28 x 1012 watts, and coal has an energy content of about 30 x 106 J/..
if the mass of liquid to vapor in a mixture of saturated liquid and vapor water is 0.8, what is the quality of the mixture
1. What is meant by the "base value" in an arithmetic gradient 2. Which two alternative comparison techniques requier equal service lives Why
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