Sea water can be desalinated by using reverse osmosis. A plant treats 4,000 m^3/day of feed water containing 27,000 ppm of salinity. The product salinity is 300 ppm. What is the product recovery (desalinated water) based on the volume of the feed? The salinity of the brine output is 52,000 ppm.

please answer number 09 please

A stream containing propionic acid and water at 70:30 mass ratio is fed to a mixer at 3.181 kg/s with pure cyclohexane as solvent. What should be the flow rate of the solvent in order to attain 30:70 mass ratio of solute and solvent in the extract (solvent-rich) stream? Prepare graphical and computational solution. Propionic acid 0.0 1.0 0.1 0.9 0.2 0.8 0.3 0.7 +1 0.4 + ++ 0.6 0.5 0.5 0.6 0.4 0.7 0.3 0.8 0.2 0.9 0.1 1.0 0.0 0.0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0 Cyclohexane Water

What advantage does traditional distillation for desalination of seawater has compared to reverse osmosis? A) The total energy requirement is much lower. B Operating costs are much lower. C) none of the choices D Fouling is not much of an issue. E) The technology involved is much simpler and can be attempted at small or large scales.

A water cleanup operation involves stripping vinyl chloride from contaminated ground water at 25 °C and 850 mm. Hg using a countercurrent, staged stripper. The feed has 5.0 ppm(molar) vinyl chloride, and the outlet water contains 0.1 ppm (molar) vinyl chloride. Inlet air used for stripping is pure. For a liquid flow rate of L = 1 kmol/h , determine the following :  Minimum gas flow rate in kmol/h. If the actual gas flow rate = 2.0 × (minimum gas flow rate) calculate the number of stages Henry’s constant (HB) for vinyl chloride = 1243. 84 atm.

34. calculate the residence time of the methane stream in the porous absorber given the solar power of 2.3193 kW and a felt temperature of 1758 K. the methane flow rate is 12683.916793505834 cm^3/min. the porous carbon felt absorber has a porosity of 0.9 and a thickness of 3.2 mm.

An evaporator is concentrating solutions coming from two different sources. The solution from the first source containing 10% NaCl and 10% NaOH flows at the rate of 44kg/min. The other solution containing 8% NaCl and 12% NaOH flows at the rate of 90 kg/min. Two streams are fed directly to the evaporator. If 34% of the total water is to be evaporated, how many kg of water evaporated?

If the slurry is filtered using a larger filter press with an area of 15 m2 at a constant rate of 450 L/h, calculate the volume of filtrate that will be recovered and the time it will take to reach a pressure of 1000 kPa.

(a) Scenario 1 Picture shows a agriculture field located near a chemical factory and often encounter acid rainfall. The field was previously used to plant corn. The metal water pipe buried underneath the soil corrodes. i. Scenario 1 shows a combination of factors, discuss how a combination of pH, microbiological activities and degree of aeration affect the rate of corrosion in the context of this scenario. ii. Explain how the lack of oxygen may have caused the metal water pipe buried underneath the soil to corrode.

In a counter-current absorption tower, a process gas containing 0.04 (mole fraction) ammonia is scrubbed with pure water. The exit gas contains 0.002 (mole fraction) ammonia.The diameter of the tower is 1m, and the packing has a large area per volume of 200 m2m–3. The overall mass transfer coefficient based on the liquid side driving force, KL, is 1.5×10−5ms–1. The total gas and liquid concentrations are 0.6kmolm–3and 20 kmolm–3respectively and the gas flowrateis 0.03kmols–1. The actual liquid to gas ratio is 1.5 times that of the minimum liquid to gas ratio. The equilibrium for ammonia between the air and water is given by y* = 1.04x. If the operator increases the gas flow by 20% while keeping the liquid flow and the entering gas and liquid compositions constant,what are the new mole fractions of ammonia in the exit gas and the exit liquid? Assume that the overall mass transfer coefficient does not change with the gas flow.