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A waste water plant may have to remove phosphorus (phosphate) from its wastewater prior to discharge to the River. The DNR may set an effluent standard as low as 0.1 mg P/L. You are to make some preliminary calculations about phosphorus removal by chemical precipitation. Use the following data to make your calculations.Design average wet-weather flow (AWW) = 10 MGDTotal phosphorus concentration = 6 mg P/LAlkalinity = 120 mg/L as CaCO3pH = 6.9Alum: $1/gallon; density = 11.1 lb/gallon; 42% active alum by weightFeCl3: $1.10/gallon; density = 11.3 lb/gallon; 35% active FeCl3 by weight(a) Calculate the annual costs ($/yr) of meeting the proposed effluent requirement of 0.1 mg P/L using alum to precipitate AlPO4(s). Assume the chemical formula for alum is Al2(SO4)3·18H2O (MW = 666).(b) Assuming an interest rate of 6% and a design life of 20 years, calculate the net present worth of the annual costs determined in part (a).(c) Calculate the annual costs ($/yr) of meeting the proposed effluent requirement of 0.1 mg P/L using FeCl3 to precipitate FePO4(s).
Samples of 20 rivets for a steel structure are checked for quality every hour. The probability of finding a bad rivet that has to be scrapped is 1%.assume that x is the number of parts in the sample of 20 that have to be scrapped.
A crest vertical vurve and a horizontal curve on the same highway have the same design speed. The equal-tangent vertical curve connects a +3% initial grade with a +1% final grade and has a PVC at 101+78 and a PVT at 106+72
A roadway is to be designed on a level terrain. The roadway is 500 ft. Six Cross Sections have been selected at 0 ft, 100 ft, 200 ft, 300 ft, 400 ft, and 500 ft. . The cross sections have areas of 130 ft2, 140 ft2, 70 ft2, 110 ft2, 80 ft2, and 25 ..
A 4000-m 3 /day conventional activated sludge plant has an influent with a BOD5 of 190 mg/L and SS of 225 mg/L. What population would this plant serve?
Calculate average figures for tonnes/round and powder factors in kg/tonne and Determine the drill metres required to achieve a production rate from grade control blasting.
As an agronomist you have been approached by a large pepper farmer who wishes to determine an appropriate"yield goal" fot this season. He provides you with yield data for ten year period which indicates that his production has been slowly decreasi..
Discuss and use examples to explain the specific factors that you will need to consider when pricing the following items in the bill of quantities foundation excavation
The maximum gage pressure is known to be 8MPa in a spherical steel pressure vessel having a 250mm diameter and a 6mm wall thickness. Knowing that the ultimate stress in the steel used is (sigma u)= 400MPa, determine the factor of safety with respe..
Does the presence of Mg2+ significantly interfere with the determination of Ca 2+ by the EDTA titration?
What is the average length of queue, the average time spent in the system, and the average waiting time in the queue?
An empty air tank has a volume of 0.024 m3. The compressor on the tank is run until the pressure gauge reads about 65 psi (or 22,500 Pa). Assuming the temperature of the tank is 25 C, find the density of the air and the weight of the air in the ta..
During a 108 minute long storm, the precipitation rate over a 100 acre area is 1.65 in/hr. The phi index is 0.42 in/hr. The average outflow from the area is 92 cfs during the storm. What is the value of combined detention and interception storages ..
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