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ACTIVATED SLUDGE REACTOR
Given:
BOD5 Influent = 400 mg/L
20% BOD removal in Primary Clarifier
BOD5 Effluent = 1 mg/L
Flow Rate is 60% of the Drinking Water flow rate for your particular location
Determine:
Volume of the Activated Sludge Reactor
Dimensions of the tank (Assume, L=3-5 W; L=5-10 D)
Concentration of Biomass in the Reactor (2000 – 4000 mg/L)
Solids Retention Time
Hydraulic Retention time (3-6 hrs)
Biomass wasted per day
Oxygen requirement per day
Recirculation Ratio
Draw a complete flow diagram with the values for flow rate, concentration,
volume, etc. clearly labelled.
Arka Pandit, Ph.D.
Kinetics of Microbial Growth
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10/11/2017
The microbial growth equation can be represented as:
dX a
Xa
dt
M
X a active (viable) biomass concentration 3
L
t time T
1
Xa
dX a
1
specific
growth
rate
dt
T
1 dX a
1 ln 2
ˆ
maximum
specific
growth
rate
T td
X a dt max
td doubling time T
Kinetics of Microbial Growth
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For 𝑋𝑎0 =active biomass concentration at t=0,
ln X a ln X a0 t ; or X a X a0e t
The bacterial growth rate is proportional to the substrate
utilization rate:
dX a
dS
Y
dt
dt
dS 1 dX a
or ,
dt Y dt
Combining ,
dS
Xa
dt Y
1
Define : U
Y Xa
Kinetics of Microbial Growth
Where,
Y = true-yield coefficient (M biomass formed/M
substrate utilized)
S = rate-limiting substrate concentration (ML-3)
Where,
dS U = specific substrate utilization rate (M
dt substrate utilized/(M biomass per T)
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Kinetics of Microbial Growth
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Kinetics of Microbial Growth
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Kinetics of Microbial Growth
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Kinetics of Microbial Growth
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Kinetics of Microbial Growth
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Kinetics of Microbial Growth
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Class Notes of Prof. Spyros G. Pavlostathis, Georgia Institute of
Technology
Kinetics of Microbial Growth
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Arka Pandit, Ph.D.
Suspended Growth Process
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Suspended Growth Process
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Suspended Growth Process
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Suspended Growth Process
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Suspended Growth Process
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Suspended Growth Process
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Suspended Growth Process
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Suspended Growth Process
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Suspended Growth Process
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Suspended Growth Process
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Suspended Growth Process
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Suspended Growth Process
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Arka Pandit, Ph.D.
Suspended Growth Process
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10/31/2017
Suspended Growth Process
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Suspended Growth Process
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Suspended Growth Process
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Suspended Growth Process
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Suspended Growth Process
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Suspended Growth Process
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Suspended Growth Process
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Suspended Growth Process
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Suspended Growth Process
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Suspended Growth Process
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Suspended Growth Process
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Suspended Growth Process
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Suspended Growth Process
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Suspended Growth Process
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Suspended Growth Process
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Suspended Growth Process
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Suspended Growth Process
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Suspended Growth Process
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Class Notes from Spyros G Pavlostathis, Georgia Institute of
Technology
Suspended Growth Process
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Reports
Technical reports are often written to enable executives, project engineers, or supervisors to make
decisions regarding a technical investigation, experiment, or design. The reports required for the
Civil Engineering Materials Courses should be neat, orderly, and produced individually, unless
otherwise instructed.
In general, all text should be 12-point font Times New Roman. Please single space the lines (or
use 1.15 as done here) and put an extra space between paragraphs. All paragraphs should be
“justified” (i.e. not left aligned). Tables and figures should be just large enough to read and should
be properly referenced in the text. Captions should be placed below all figures and above all tables
(ex: Table 1: description of Table 1). Remember that someone should be able to read your report
and be able to understand what you did, how you did it, and the results of your testing/design calcs.
All reports must be submitted in paper form.
Reports
The reports are designed to be somewhat longer than the memo reports and provide more
information. The lead author is responsible for putting all of the parts of the report together, making
sure the language is consistent, and submitting the report. They essentially act as the project
manager for that lab. All team members are responsible for working on individual sections, data
analysis, proof reading, etc. Each team will need to decide how to divide the work for each group
report; however, a sheet with the percent of each task completed by each team member will be
submitted with each report. The lead author is also responsible for attaching an evaluation rubric
with the top portion completed. Appendix B includes an example of the format of the Group Memo
Report and a copy of the grading sheet.
A-1
Appendix B: Group Reports
Format of Group Reports………………… B-2
Group Report Grading Sheet……………. B-5
B-1
Date
John Demtry, Ph.D., P.E.
University of South Alabama
Department of Civil, Coastal, & Environmental Engineering
Solorado, AL
Subject: Design Lab Title
Introduction and Objective
2 paragraphs: 1 for introduction 1 for purpose/objective (what, when, where, why)
Engineering Team Members
The team consisted of the following individuals… (put in alphabetical order)
The primary author of the report is …, the secondary author of the report is …
Description of the Design Lab Activity
Give a brief verbal description of design lab activity. Be sure to include a description of the
methods used, any standards/design criteria that were followed (10-State Standards, etc.), and any
engineering judgement justifications used. This section should be technical, but “to the point”.
Describe what was what were determined/calculated, and how.
Results and Discussion
The results section should include all of the determined/calculated results. Make sure you have
good use of tables and graphs, if needed. You will also briefly discuss your results and each
table/figure in this section.
B-2
References
The references should be listed alphabetically with no numbering.
Appendices
Each appendix should start on a new page.
Appendix A. Design criteria, standards, codes used.
Appendix B. Sample calculations and figures/tables of determinations/calculations.
Appendix C. Report of contributions by each team member.
B-3
Sample Format for Appendix C
Design Lab Title
Date of activity
Your group number
Task
Introduction and objective
Description of the experiment
Results
References
Appendix A
Appendix B
Appendix C
Name of Primary
Author
60
40
50
Name of Secondary
Author
40
60
50
10
50
50
50
90
50
50
50
Analysis tasks (list tasks below)
B-4
CE 471: Water/Wastewater Design Lab
Group Report Evaluation
Primary Author: _______________________________________
Secondary Authors: _____________________________________
Group Number: ____
Design Lab Name: ____________________________________________________
The report will be evaluated for technical correctness, clarity of explanation, grammar, and
spelling.
Maximum Points
Introduction and objective
15
Description of the experiment
15
Results and Discussion
20
Citations and References
10
Technical Writing (grammar, paragraph and
sentence structure, technical language, etc.)
30
Score
Subtotal (90 possible)
Appendices Section of the report
A. Design criteria, standards, codes used
4
B. Sample calculations/determinations and
summary figures/tables to justify design
4
D. Report of contributions by each team member
2
Subtotal (10 possible)
Grading rubric attached and filled out
-5
Submitted paper copy
-10
Evaluation date
Punctuality at lab (individual to student)
Total
-5
B-5
C-1