A 15-cm-thick mesh filter is being used to filter uniformly sized microorganisms from a 10 m3/minute air stream, effectively reducing the concentration from 200 microorganisms/m3 to 10/m3 over a 100-hour fermentation period. New regulations mandate a reduction to 1/m3 . If the air velocity and ambient conditions do not change, what depth of the same type of filter is required?

This method of leak detection is simple and practical as it does not require expensive equipment, sometimes the use of antifreeze is required. c) ultrasonic detection b) ultraviolet light d) simple auditory inspection a) soap solution   Which of the following groups of refrigerants has the greatest impact on the ozone layer? b) HCFC d) HFC a) CFC c) HC

In the process of drying carrots using a parallel flow drying system, the material with a moisture content of 85% enters the drying system at a rate of 500 Kg / hour to produce dry carrots with a moisture content of 20%. If it is known that hot air used as the drying medium has a humidity ratio of 0.006 Kg of water per Kg of dry air and the flow of hot air enters the system at a rate of 200 Kg of air for each dry matter produced, calculate the ratio of humidity to air leaving the system assuming that the system is under steady state conditions.

1.6 Properties: Diffusivity Estimate the molecular diameter and diffusion coefficient for the proteins ribonuclease (MW 13,700 Da), hemoglobin (MW 68,000), and urease (MW 480,000), assuming the molecules are spherical and the density of each protein molecule is 1.3 g/cm³.

An evaporation-crystallization process (as shown below) is used to obtain solid potassium sulfate from an aqueous salt solution. The feed contains 18.7 wt% K2SO4. The wet filter cake contains solid sulfate crystals and a 40.0 wt% salt solution. The filtrate is recycled to mix with the feed. The evaporator has a capacity of 175 kg of water evaporated per second. The filtrate has 40.0 wt% salt solution, as well, and from the water entering the evaporator, 45.0% is evaporated. In the wet filter cake, there is 10 kg of the solid crystals for every 1 kg of the salt solution. a.) Calculate the fresh feed rate. (Include units) b.) Determine the production rate of crystal. (Include units) c.) Calculate the recycle ratio. (kg recycle/kg feed) Include units

A double effect evaporator is used to concentrate an 18% CuSO4 solution. At the end of evaporation, 26,000 kg/h of 50% CuSO4 solution were obtained. If the water evaporated in the second effect is half the water evaporated in the first effect, determine: a) The amount of solution fed into the first effect. b) The amount of water evaporated in the first and second effect. c) The amount of solution fed into the second effect, as well as its composition. Problem diagram 18% CuSO4 82% H₂O M₁ M₂ M3 X CuSO4 Y H₂O A 2 M4 = 0.5 M₂ M5 H₂O steam M6 M2 M6 is the water that condenses 26 000 kg/hr 50% CuSO4 50% H2₂O

An evaporation-crystallization process (as shown below) is used to obtain solid potassium sulfate from an aqueous salt solution. The feed contains 18.7 wt% K2SO4. The wet filter cake contains solid sulfate crystals and a 40.0 wt% salt solution. The filtrate is recycled to mix with the feed. The evaporator has a capacity of 175 kg of water evaporated per second. The filtrate has 40.0 wt% salt solution, as well, and from the water entering the evaporator, 45.0% is evaporated. In the wet filter cake, there is 10 kg of the solid crystals for every 1 kg of the salt solution. a.) Calculate the fresh feed rate. (Include units) b.) Determine the production rate of crystal. (Include units) c.) Calculate the recycle ratio. (kg recycle/kg feed) Include units

Reverse Osmosis is used by water bottling companies to produce desalinized water from sea water. Giventhe figure below, determine the fraction of brine leaving the RO cell that is recycled.

The following consideration(s) is/are relevant to the choice of refrigerant (SELECT ALL that apply): Vapor pressure Environmental factors Toxicity and corrosion properties Water is usually used as the refrigerant

To make an instant tomato soup, a company makes soup powder from liquid step by a two-step process: concentrating the soup by removing water using a membrane to reach a concentration of 45% water, followed by a spray drying process which leads to a final moisture content of 3%. If the initial liquid tomato soup contains 9.0% solids and fat and enters the membrane separator at 4000 kg/hr, calculate: The flow-rate of the concentrated soup after membrane separation: kg/hr The flow-rate of water removed by the spray drying process (the second stage): kg/hr