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In order to evaluate the impact of a waste on a receiving water, we must calculate the concentration of the waste as it mixes with the stream and how that concentration changes as the waste moves downstream, degrading as it travels. The first step involves a mixing basin analysis, and the second applies first-order kinetics in a plug flow reactor. A steel mill waste is dis-charged at a rate of 0.75 m3/s; the waste has a dissolved oxygen (DO) concentration of 3 mg/L, a CBOD equal to 229 mg/L and an NBOD equal to 114 mg/L. The river receiving the waste has a.flow of 6 m3/s and travels at a velocity of 9 km/day. The river has an ammonia-nitrogen concentra-tion of 0.5 mg NH3-N/L, a CBOD of 2 mg/L, and a dissolved-oxygen (DO) concentration of 6 mg/L upstream of the discharge. Calculate the DO, NBOD, and CBOD in the river immediately after it becomes mixed with the waste and the NBOD, NH3-N, CBOD, and CBOD518 km downstream of the point of discharge. Assume a rate constant for ammonia oxidation (kA,) of 0.15 day" and a rate constant for CBOD exertion of 0.1 day".
Is the test result reasonable? Explain your answer.
On a busy construction site, most control stations are blocked from a proposed area of layout. Describe how to create a convenient free station control point using resection techniques.
A 100 ft cut steel tape was used to measure between two property markers. The rear surveyor held 93 ft, while the head surveyor cut .67ft. What was the distance between the markers?
The u-tube manometer has legs of unequal internal diameter d1 and d2, which are partially filled with immiscible liquids of density1, and density2 respectively and which are open to the atmosphere at the top.
A Waste water has been characterized for nitrogen-containing compounds and the TN was 26 mg N/L, the TKN was 14 mg N/L and nitrate was 27.3 mg NO3-/L. What is the potential theoretical oxygen demand (mg O2/L) associated
The beam is positioned such that the observer on the train measures an angle of 19 between the crossbeam and the floor of the train. At what speed would the train have to be traveling in order for an observer standing outside the train
the pressure ratio across the compressor is 9 and the maximum temperature is 827c.the turbine and comprssor processes are adiabatic with turbine efficiency of 90% and a compressor efficiency of 85%.
You are in charge of the construction site of a new dam. Extremely heavy rainfall starts and Bureau of Meteorology hydrologists tell you that beginning at about 8 AM, 2 GL per hour (2 x 106 m3 per hour) will flow into the dam. The lake behind the dam..
If a single deposit of $15,000 is invested at 2.75% yearly interest, what equal year-end withdrawls can be made each year for 10 years, leaving nothing in the fund after the 10th withdrawl
Estimate the chronic daily intake of 1,1,1-trichloro ethane from exposure to a city water supply that contains a 1,1,1-trichloroethane concentration equal to the drinking water standard of 0.2 mg/L.
An aircraft has a glide ratio of 12 to 1. (glide ratio means that the plane drops 1m for every 12m it travels horizontally.) A building 45m high lies directly in the glide path to the runway.
The 30-Mg freight car A and 15-Mg freight car B are moving toward each other with the velocities VA= 20 km/h to the right and VB= 10 km/h to the left. the spring constant on car A is k= 3MN/m.
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