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A 2-tank Step Aeration Activated Sludge (SAAS) system has the following characteristics: V1 V2 Q Waste Recycle Oxygen demand (L) (L) (L/min) Ratio Ratio of Cells 500,000 450,000 100 0.45 0.5 1.2 Xv1 Xv2 Xd1 Xd2 SO S1 S2 Xrv Xrd (mg/L) (mg/L) (mg/L) (mg/L) (mg/L) (mg/L) (mg/L) (mg/L) (mg/L) 1500 ☐ 14 1400 200 150 150 10 2 2000 1000 1. What is the mean cell residence time and hydraulic residence time in days? 2. Write the mass balance equation for required oxygen in tank #1. 3. What is the oxygen requirement for tank #1 in kg/day? (equation will be in units of mg/min)

A 2-tank Step Aeration Activated Sludge (SAAS) system has the following characteristics: V1 V2 Q Waste Recycle Oxygen demand (L) (L) (L/min) Ratio Ratio of Cells 500,000 450,000 100 0.45 0.5 1.2 Xv1 Xv2 Xd1 Xd2 SO S1 S2 Xrv Xrd (mg/L) (mg/L) (mg/L) (mg/L) (mg/L) (mg/L) (mg/L) (mg/L) (mg/L) 1500 ☐ 14 1400 200 150 150 10 2 2000 1000 1. What is the mean cell residence time and hydraulic residence time in days? 2. Write the mass balance equation for required oxygen in tank #1. 3. What is the oxygen requirement for tank #1 in kg/day? (equation will be in units of mg/min)

Structural Analysis
Structural Analysis
6th Edition
ISBN:9781337630931
Author:KASSIMALI, Aslam.
Publisher:KASSIMALI, Aslam.
Chapter2: Loads On Structures
Section: Chapter Questions
Problem 1P
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A 2-tank Step Aeration Activated Sludge (SAAS) system has the following characteristics: V1 V2 Q Waste Recycle Oxygen demand (L) (L) (L/min) Ratio Ratio of Cells 500,000 450,000 100 0.45 0.5 1.2 Xv1 Xv2 Xd1 Xd2 SO S1 S2 Xrv Xrd (mg/L) (mg/L) (mg/L) (mg/L) (mg/L) (mg/L) (mg/L) (mg/L) (mg/L) 1500 ☐ 14 1400 200 150 150 10 2 2000 1000 1. What is the mean cell residence time and hydraulic residence time in days? 2. Write the mass balance equation for required oxygen in tank #1. 3. What is the oxygen requirement for tank #1 in kg/day? (equation will be in units of mg/min)
Transcribed Image Text:A 2-tank Step Aeration Activated Sludge (SAAS) system has the following characteristics: V1 V2 Q Waste Recycle Oxygen demand (L) (L) (L/min) Ratio Ratio of Cells 500,000 450,000 100 0.45 0.5 1.2 Xv1 Xv2 Xd1 Xd2 SO S1 S2 Xrv Xrd (mg/L) (mg/L) (mg/L) (mg/L) (mg/L) (mg/L) (mg/L) (mg/L) (mg/L) 1500 ☐ 14 1400 200 150 150 10 2 2000 1000 1. What is the mean cell residence time and hydraulic residence time in days? 2. Write the mass balance equation for required oxygen in tank #1. 3. What is the oxygen requirement for tank #1 in kg/day? (equation will be in units of mg/min)
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