Finding the right balance - Freese and Nichols, Inc. Operation.pdf · Influent Anoxic Aerobic...
Transcript of Finding the right balance - Freese and Nichols, Inc. Operation.pdf · Influent Anoxic Aerobic...
![Page 1: Finding the right balance - Freese and Nichols, Inc. Operation.pdf · Influent Anoxic Aerobic Clarifier Effluent Solids RAS WAS Secondary clarification enables activated sludge treatment](https://reader031.fdocuments.in/reader031/viewer/2022022515/5afe688a7f8b9a444f8ec7c6/html5/thumbnails/1.jpg)
Nick Landes, Ph.D., P.E.
Finding the right balance:
April 13, 2017
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Influent Anoxic AerobicClarifier
Effluent
Solids
RAS
WAS
Secondary clarification enables activated sludge treatment
This Works
This Doesn’t Work
✓
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Some Clarification
(1) Separationof Water from Bacteria
(2) Thickening& Return of Bacteria
(3) Storage of Bacteria (only as a last resort)
EFFLUENT
BACTERIA
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Factors Impacting Clarifier Performance
• Clarifier Surface Area
• Clarifier Hydraulics
• Flow (Influent, RAS, WAS)
• Mixed Liquor
• Sludge Settling
• Influent quality
• Selector zones
• Operating DO
Not practical to change
Practical to change , not simple
Practical to change on a day
to day basis
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Influent Anoxic AerobicClarifier
Effluent
Solids
RAS
WAS
Operating a clarifier has nothing to do with the physical clarifier
Quality Control Performance
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State Point Analysis can help understand operational adjustments
• Clarifier Surface Area
• Clarifier Hydraulics
• Flow (Influent, RAS, WAS)
• Mixed Liquor
• Sludge Settling
• Influent quality
• Selector zones
• Operating DO
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Solid
s Fl
ux,
lbs
/ sf
-d
MLSS, g/L
State Point Analysis (SPA)
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MLSS, g/L
Snapshot of your clarifier’s performance
Overflow Line (Inf. Flow)
Solids Flux
(Settleability)
Underflow Line (Inf. Flow,
Recycle Rate, MLSS)
State Point
MLSS Conc. RAS Conc.
Solids Loading
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MLSS, g/L
Stay Under the Solid’s Flux Umbrella
Overflow Line (Inf. Flow)
Solids Flux
(Settleability)
Underflow Line (Inf. Flow,
Recycle Rate, MLSS)
State Point
Good performance indicated when:
1. State Point is below Solids Flux
2. Underflow Line is below descending
limb of Solids Flux
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Problem 1: Wet Weather Flows
Adjustment 1
•Decrease MLSS to clarifier
•Operate step-feed or
contact stabilization0
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Solid
s Fl
ux,
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MLSS, mg/LAdjustment 2
•Bring offline clarifiers
online
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s Fl
ux,
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/ sf
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Problem 2: Rising Sludge
Adjustment
•Increase RAS Rate
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Problem 3: Filamentous Sludge
Adjustment
• Dose Chlorine in RAS
• 2 to 8 lbs Cl2 / d /
1000lb MLSS
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SPA Spreadsheet
Developed in Excel
Usable on any device that supports MS Excel
Downloadable Through Dropbox
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Procedure for Using Spreadsheet
(0) Physical data
(1) Model Input
(2) Metrics Output
(3/4) SPA Graph and Guidance
(5) Guidance for Impact of SRT change
Measurements
Evaluate Impact of Adjustments
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Walk Through
Steps 0 through 2Scan QR Code or Click on
Link for Spreadsheet
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Walk Through
Step 3Scan QR Code or Click on
Link for Spreadsheet
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Walk Through
Step 4Scan QR Code or Click on
Link for Spreadsheet
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Walk Through
Make AdjustmentsScan QR Code or Click on
Link for Spreadsheet
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Walk Through
Step 4 Compares
Before/After
Scan QR Code or Click on
Link for Spreadsheet
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QUESTIONS?Nick Landes, Ph.D., P.E. │ [email protected] │ (817) 735-7571
Influent Aerobic Effluent
WAS
RAS Pump
WAS Pump
Scan QR Code or Click
on Link for Spreadsheet