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Organic carbon (C) and ammonia nitrogen (NH3) are oxidized to carbon dioxide (CO2) and nitrate (NO3-) respectively, by bacteria that are naturally present in wastewater and in natural systems such as lakes and rivers. Both of these reactions consume oxygen and may cause a negative impact on water quality. The amount of oxygen theoretically required to consume a carbonaceous (ThOD) or nitrogenous (NOD) waste may be calculated according to the stoichiometry of the reactions as outlined in this chapter. The production of coke, a fuel produced from coal for use in steel mills, generates a waste gram rich in ammonia, phenol, and naphthalene. Calculate the NOD and ThOD of a waste containing 25 mg/L of ammonia-nitrogen (NH3-N), 50 ing/L of phenol (C6H5OH). and 150 mg/L of naphthalene (C10H8). What is the total theoretical oxygen demand of the waste?
You may pay $15,000 for an annuity that pays $2500 per year for the next 10 years . You want a real rate of return of 5% , and you estimated inflation will average 6% per year. Should you buy the annuity?
A 24-in.-long copper bar with a yield strength of 30,000 psi is heated to 120°C and immediately fastened securely to a rigid framework. The coefficient of thermal expansion for copper is 16.6x10-6 (1/oC).
A four-sided closed field traverse has the following angles. A = 81 degrees 22%u201930%u201D, B = 72 degrees 32%u201930%u201D, C = 89 degrees 39%u201930%u201D, D =116 degrees 23%u201930%u201D.
Determine the internal moments at A and B, then draw the moment diagram. Assume B and C are rollers. EI is constant. Show which FEM equations were used and how you determined them.
The base engine develops 200 ft-lb of torque, and a modified version of the engine develops 240 ft-lb of torque. If the overall gear reduction ratio is 8 to 1, what is the maximum acceleration from rest (in ft/sec^2) for:
At A, the pipe diameter is 24 in and the pressure is 45 psi. At B, the pipe diameter is 12 in and the pressure is 50 psi. Point B is 3 f t lower than A. Find the flow rate if the pump puts 22 hp (16 kW) in to the flow. Neglect head losses.
Assuming that the number of days until the next dry day is geometrically distributed, what is the length of consecutive wet days that has a probability of occurence of no more than 0.05
The volume of the first pond is 5.0 million gallons, and the second pond is 3.0 million gallons. Assuming complete mixing within each pond, find the BOD concentration leaving each pond
A rigid tank contains 5kg of water at 20 degrees Celsius. A gage on the tank reads 200kPa. Determine a) the volume of the tank, b) How much would the pressure in the tank increase if the temperature were increased to 50 degrees Celsius.
A simply supported beam has a concentrated downward force P at a distance of a from the left support, as shown in the figure below. The flexural rigidity EI is constant. Find the equation of the Elastic Curve by successive integration
A hole at the bottom of a fish tank releases water at a rate given by the free jet equation. The hole at the bottom has a .5" diameter. If the water level is desired to be at 2' high and be at steady state, what is the rate of water to be added to th..
what would be the estimated total annual dollar savings of a company with an annual direct labor payroll of 2,500,000 and a fixed overhead rate of 150 percent of direct labor , if the company initiated a methods and standards program
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