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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).
HOCL is added to water in a tank as a disinfectant. After equilibrium is reached it is found that the pH of the water in the tank is 8.2 and the gas phase partial pressure is the head space of the tank is 0.2E-7 atm.
the rigid bar abcd is supported by a pin at B and restrained by identical steel bars at C and D, each of area 250mm^2. if the temperature is increased by 80C, determine the force P that will cause the bar at c to be stress-free.
A 0.20 kg stone attached to a 0.8 m long string is rotated in a horizontal plane. The string makes an angle of 25° with the horizontal. Determine the speed of the stone.
A fluid flowing in a pipe 30cm in diameter has a uniform velocity of 4m/s. The pressure at the center of the pipe is 40KPa, and the elevation of the pipe's centerline above an assumed datum is 4.5m. Compute the total energy per unit weight of the ..
Estimate the median and 90th percentile load of SS contained in the runoff. Note: COV = coefficient of variance
Determine the magnitude of reaction at point A (in kips) of a 20' beam with 5kips at 4' of the beam and 2kips at 9' of the beam at 350lbs./ft.
Design an algorithm that lists all possible rearrangements of the symbols in a string of five distinct characters. (in pseudocode)
what is the distiniction b/n point and non point sources of water pollution and thier varation with surface and ground water?
the pressure inside a commercial airliner is maintained at 1.00 ATM. what is the net upward force exerted on a (1.0 m)(200 cm) cabin door if the outside pressure is 0.30 ATM?
The pollutant has a reaction rate coeeficient k of 0.25/day. Assuming is pollutant is well mixed in the lake, find the steady-state concentration of pollutant in the lake.
Assume you are responsible for determining the maximum load that can be carried by a rectangular barge that is 8 m wide and 18 m long. The water line when the barge is empty is 3 m below the level of the cargo deck.
A young engineer has invented holographic mobile phones and has approached a venture capital company to invest in it. The venture capital company considers the product to be an all or nothing product
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