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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?
Report on any construction based for example "BRIDGE CONSTRUCTION PRACTICE BY USING INCREMENTAL LAUNCHING METHOD"
Assume that the coils are close to each other so that θ ≈ 0°and the deflection is caused entirely by the torsional stress in the coil.
Compute the corrected horizontal distance for the following conditions: Temperature: 25oC Tape length: 29.990m Slope angle: -3o42’ Slope measurement: 211.416m
A lake has an area of 1000 ha. The concentration of the toxicant PCB in rainfall is 100 ng/l and the average annual rainfall is 70 cm. What is the average annual mass loading of PCB from the precipitation to the lake in kg/year.
A survey distance of 369.98 ft was recorded when the field temperatures was 100 degreesF. What is the distance, corrected for temperatures
One mole of an ideal monoatomic gas initially at 300 K is expanded from an initial pressure of 10 atm to a final pressure of 1 atm. The molar heat capacity for constant volume for the gas is Cv = 3/2 R .
The particle has a mass of 0.6 and is confined to move along the smooth horizontal slot due to the rotation of the arm .Determine the force of the rod on the particle and the normal force of the slot on the particle when = 35.
The influent BOD5to a primary settling tank is 345 mg/L.The average flow rate is 0.050 m3/s.If the BOD5 removal efficiency is 30%,How many kg of BOD5 are removed in the primary settling tank each day?
A wastewater is discharged to a stream with a reoxygenation constant of 0.5 day-1 and a velocity of 1 m/sec. The oxygen saturation concentration in the stream is 11 mg/L.
An investment of $80,000 is projected to generate escalated dollar net revenues (income minus costs) of $10,000 in year one, $30,000 in year 2 and $40,000 in year 3 with a $100,000 salvage
A 100-ft steel tape of cross-sectional area of 0.0020 in2, weight 2.4 lb, and standardized at 68Fo is 100.008 ft between end marks when supported throughout under a 15-lb pull. What is the true horizontal length of a recorded distance AB for the cond..
The A tannery asked for assistance in prep for NPDES permits to discharge wastewater into X river. Water quality criterion for X river is 5.00 mg/L of DO. What is critical DO and where (at what distance) downstream does it occur?
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