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BOD: Biochemical Oxygen DemandBOD5 is the total amount of oxygen consumed by microorganisms during the first five days of biodegradation
BOD5 = (DOi - Dof)/(P) this is the five-day BOD of a diluted sampleWhere DOi = the initial dissolved oxygen (DO) of the diluted wastewaterDOf = the final DO of the diluted wastewater, 5 days laterP = the dilution fraction = (volume of wastewater)/(volume of wastewater plus dilution water)A standard BOD bottle holds 300 mL, so P is just the volume of wastewater divided by 300 mL
5.53)A cubic meter of a gravel-and-sand aquifer has been contaminated with 20 L of tetrachloroethylene. If the amount of tetrachloroethylene dissolved in aquifer water is 20 percent of its aqueous solubility,a) How much tetrachloroethylene is dissolved?b) How much remains as undissolved DNAPL mass?c) If the aquifer has a gradient of 0.001, use porosity and hydraulic conductivity data for gravel-and-sand aquifers to estimate the average linear velocity of the groundwater.d) How long would it take to remove the tetrachloroethylene?
Gas diffusion and Viscosity are both transport properties, Derive the general relationship between the viscosity for a gas and diffusion coefficient .calculate the diffusion coefficient if Given that the viscosity of Ar is 223 micro Pascals at 29..
CHEM 354 Extended Problems, The variation of EMF for the cell below with temperature is shown in the graph below.
Have you observed that when you spill water over your skin on a hot day it will cool you down but if you spill vegetable oil in place of water it will not cool you down give explanation for this difference?
Give explanation why it is not practical to evaluate the solubility of the two salts AX and BY2, by simply comparing the solubility product constants?
Chemical Kinetics - Determine the time taken by a reactant to reach a particular concentration
Determine the molarity of a solution of sodium hydroxide (NaOH) if 27.9 mL of this solution combines exactly with 22.30 mL of 0.253 M
what are the pH and the change in pH after the addition of 0.054 mol hydrochloric acid to the buffer solution?
Find out the Kb of ammonia if the pH of a buffer formed by mixing 50.0 mL of 1.00 M NH 3 and 50.0 mL of 1.00 M ammonium nitrate?
An electron traveling at the velocity of 3.7 105 m/sec has an uncertainty in its velocity of 2.34 105 m/s. determine the uncertainty in its position?
Using a sample of gas has a mass of 38.7mg. Calculate the molar mass if its volume is 228mL at a temperature of 57°C and a pressure of 832torr?
Find out how much energy is needed to raise the temperature of 22.8 g of diethyl ether from -10.0 degree celsius to 142.0 degree celsius?
Determine the pressure in Standard atmospheres,Torr and mm Hg units when A gauge on compressed gas cylinder reads 1500 psi ( pounds per square inch; 1 atm =14.7 psi).
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