Hw4 with updated answer key
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This document contains 10 homework problems related to environmental engineering calculations. The problems cover topics like water softening, sizing rapid mix basins and flocculation tanks, particle removal in clarifiers, sizing rapid sand filters, and sizing sedimentation tanks and estimating chlorine concentrations for water treatment. For each problem the question is stated and the calculated answer is provided.
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Jonathan Mulosa ET'Al
This document summarizes the design of a hydrometallurgical copper processing plant aimed at processing 15 tons of copper oxide ore per day. The plant utilizes a comminution circuit to grind the ore to an optimal size, followed by leaching to extract the copper. Solid-liquid separation then purifies the solution, which undergoes solvent extraction and electrowinning to produce copper cathodes. Laboratory experiments and theoretical calculations were used to design and size the equipment. The plant is estimated to recover over 80% of the copper at a capital cost of $1.5 million and produce around 583 tons of copper annually, making it a viable small-scale option. Recommendations include using design software and specialized engineers to
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Geopolymer concrete is a type of concrete that is made by reacting aluminate and
silicate bearing materials with a caustic activator. Commonly, waste materials such as fly ash or
slag from iron and metal production are used, which helps lead to a cleaner environment. Since,
the current usage of fly ash in India is still around 25% and below 45% even in the developed
countries like United States, there is a huge scope for fly ash in upcoming years. So let us harness
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Microbial Fuel Cell
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- 1. EG-CE 441 Environmental Engineering Homework #4 (Due 10/29/2013) 1. (Problem 6-13) Determine the lime and soda ash dose, in mg/L as CaCO3, to soften the following water to a final hardness of 80 mg/L as CaCO3. The ion concentrations reported below are all mg/L as CaCO3: Ca+2 = 120; Mg+2 = 30, HCO3- = 70, CO2 = 10. Answer: 100 and 40mg/L respectively 2. (Problem 6-16) Determine the lime and soda ash dose, in mg/L as CaCO3, to soften the following water to a final hardness of 70 mg/L as CaCO3. The ion concentrations reported below are all mg/L as CaCO3: Ca+2 = 220; Mg+2 = 75, HCO3- = 265, CO2 = 17. Answer: 352 and 0, respectively 3. (Problem 6-30) What is the volume required for a rapid-mix basin that is to be used to treat 0.05 m3/s of water if the detention time is 10 seconds? Answer: 0.5 m3 4. (Problem 6-31) Two parallel flocculation basins are to be used to treat a water flow of 0.150 m3/s. If the design detention time is 20 minutes, what is the volume of each tank? Answer: 90 m3 5. (Problem 6-45) If the settling velocity of a particle is 2.80 mm/s and the overflow rate of a “horizontal” clarifier is 0.56 cm/s, what percent of this kind of particles are retained in the clarifier? Answer: 50% 6. (Problem 6-47) If the flow rate in Problem 5 is doubled, what percent removal of this kind of particles would be expected? Answer: 25% 7. (Problem 6-54) For a flow of 0.8 m3/s, how many rapid sand filter boxes of dimensions 10m × 20 m are needed for a loading rate of 110 m3/d•m2? Answer: 4 filters (rounding to the nearest even number) 8. A water plant superintendent tells you the four dual media filters (each 5m × 10m) are loaded at a velocity of 280 m/d. What is the flow rate through the filters in m3/s? Answer: 0.65
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