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Suppose a ponds water contains 10.0 mg/L of some algae, which can be represented by the chemical formula C6H15O6N. Using the following reactions:
C6H15O6N + 6 O2 -> 6 CO2 + 6 H2O + NH3
NH3 + 2 O2 -> NO3- + H+ + H2O
a. Find the theoretical carbonaceous oxygen demand (CBOD)
b. Find the nitrogenous oxygen demand (nBOD)
c. Find the total theoretical (carbinaceous plus nitrogenous) oxygen demand (ThOD)
If the tensil testing machine can apply no more than 925 lbs. of force to the specimen, calculate the maximum rod diameter that should be used. (precision 0.000)?
Assuming you have a roadway with 5 million traffic ESALS, and a Nominal Maximum Aggregate Size of 12.5mm, determine the requirements for:
after falling from rest from a height of 32 m a 0.45 kg ball rebounds upward reaching a height of 22 m. if the contact
At a wastewater treatment plant, FeCl3 (s) is added to remove excess phosphate from the effluent. Assume the following reactions occur: FeCl3(s) Fe3+ + 3Cl- Fe3+ + PO4 (3-) FePO4 The equilibrium constant for the second reaction is 10^26.4.
A fan is to be selected to ventilate a bathroom whose dimensions are 2 m x 3 m x 3 m. The air velocity is not to exceed 8 m/s to minimize vibration and noise. The combined efficiency of the fan-motor unit to be used can be taken to be 50 percent.
determine the factor of safety against overturning about point a if 3 .the factor of safety is defined as the ratio of
A soil borrow material in its natural state in the ground has a unit weight of 86 pcf. Its natural water content is 9%. What is the dry weight of this material
if a source of groundwater gets contaminated with a DNAPL and another one gets contaminated with a LNAPL, which one will be harder to remediate and why
Atlas Long-Haul Transportation is considering installing Valutemp temperature loggers in all of its refrigerated trucks for monitoring temperatures during transit. If the systems will reduce insurance claims by $100,000 two years from now
You are going to assemble 1,000 bolt + hole combinations. The bolts have a mean diameter of 1.000 cm, normally distributed with standard deviation of 0.010 cm. The holes have a mean diameter of 1.030 cm, normally distributed with standard deviatio..
Calculate the net present value of each option based on a discount rate of 5%/year. (Hint: draw a cash flow diagram for each of the two options.)
A bicyclist leaves from her home at 9 am and rides to a beach 40 mi away. Because of a breeze off the ocean, the temperature at the beach remains 60 °F throughout the day. At the cyclist's home the temperature increases linearly with time, going from..
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