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4. A dairy farm is planning to use a 40 m3 bioreactor to treat 160 m3/day of wastewater containing 100 mg/L of lactose (C12H22011). Lactose is expected to degrade by microbial action in a completely-mixed reactor (CSTR) with a first-order degradation rate coefficient of 16.0 / day. a. Write a balanced reaction for the complete oxidation of lactose to carbon dioxide and water. C12H22011 + O2 → CO2 + H20 b. Draw a diagram and write a mass balance equation for lactose in the tank reactor. c. Assuming steady-state conditions, determine the concentration of lactose in the outflow. mg/L Check

4. A dairy farm is planning to use a 40 m3 bioreactor to treat 160 m3/day of wastewater containing 100 mg/L of lactose (C12H22011). Lactose is expected to degrade by microbial action in a completely-mixed reactor (CSTR) with a first-order degradation rate coefficient of 16.0 / day. a. Write a balanced reaction for the complete oxidation of lactose to carbon dioxide and water. C12H22011 + O2 → CO2 + H20 b. Draw a diagram and write a mass balance equation for lactose in the tank reactor. c. Assuming steady-state conditions, determine the concentration of lactose in the outflow. mg/L Check

Introduction to Chemical Engineering Thermodynamics
Introduction to Chemical Engineering Thermodynamics
8th Edition
ISBN:9781259696527
Author:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart
Publisher:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart
Chapter1: Introduction
Section: Chapter Questions
Problem 1.1P
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4. A dairy farm is planning to use a 40 m3 bioreactor to treat 160 m3/day of wastewater containing 100 mg/L of lactose (C12H22011). Lactose is expected to degrade by microbial action in a completely-mixed reactor (CSTR) with a first-order degradation rate coefficient of 16.0 / day. a. Write a balanced reaction for the complete oxidation of lactose to carbon dioxide and water. C12H22011 + 02 → СО2 + H20 b. Draw a diagram and write a mass balance equation for lactose in the tank reactor. c. Assuming steady-state conditions, determine the concentration of lactose in the outflow. mg/L Check d. Calculate the grams of lactose that is oxidized each day. g lactose / day e. Calculate the moles of oxygen that would be consumed each day. moles 02 / day Check f. If air is composed of 21 percent oxygen, calculate the volume of air that would have to be bubbled through the reactor each day. (Assume the air temperature is 25°C.) m3 air / day g. If the efficiency of oxygen transfer into the water is 18%, calculate the volume of air that would have to be bubbled through the reactor each day. m3 air / day
Transcribed Image Text:4. A dairy farm is planning to use a 40 m3 bioreactor to treat 160 m3/day of wastewater containing 100 mg/L of lactose (C12H22011). Lactose is expected to degrade by microbial action in a completely-mixed reactor (CSTR) with a first-order degradation rate coefficient of 16.0 / day. a. Write a balanced reaction for the complete oxidation of lactose to carbon dioxide and water. C12H22011 + 02 → СО2 + H20 b. Draw a diagram and write a mass balance equation for lactose in the tank reactor. c. Assuming steady-state conditions, determine the concentration of lactose in the outflow. mg/L Check d. Calculate the grams of lactose that is oxidized each day. g lactose / day e. Calculate the moles of oxygen that would be consumed each day. moles 02 / day Check f. If air is composed of 21 percent oxygen, calculate the volume of air that would have to be bubbled through the reactor each day. (Assume the air temperature is 25°C.) m3 air / day g. If the efficiency of oxygen transfer into the water is 18%, calculate the volume of air that would have to be bubbled through the reactor each day. m3 air / day
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