Post Aerobic Digestion and Anammox A Ba

29 Pages·2016·1.55 MB·English

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David Oerke/CH2M
Tom Johnson/CH2M
Bruce Johnson/CH2M
Heidi Bauer/CH2M
Steve Graziano/CH2M
2016 Vail Operator Training Seminar
What are PAD & Anammox?
• Sidestream
Treatment
Technologies
• Reduction of
nitrogen
• No supplemental
carbon or alkalinity
WEF Webcast 12/9/2009: Sidestream Treatment
for Nutrient Removal and Recovery
What is Post Aerobic Digestion?
Aerobic digestion after anaerobic digestion
• Advantages:
– Reduction of N
without chems.
– VSS reduction
– Odor reduction
– Struvite stabilization
• Challenges:
– Biological heat
– Foam
Example Full-Scale PAD Facilities
• Spokane County Regional WRF
Chemically Enhanced
• Denver Metro WRD NTP – 11/16
Primary Treatment
• Boulder 75th Street WWTP -10/16
Step Feed Bioreactor
Raw
Membranes
Solids Reduction
& Nitrogen Removal
Centrifuge
Waste Solids
Anaerobic Aerobic
Digesters Digester
Centrate
What is Anammox
Anaerobic Ammonium Oxidation
• Advantages:
– Reduction of N
without chems.
– Lower energy
• Challenges:
– Slow growth
– Competition with
nitrite oxidizing
bacteria
Example Full-Scale Anammox
Facility
Alexandria Renew
Enterprises
(AlexRenew) Water
Resources Recovery
Facility (WRRF)
Wett, B., Murthy, S., Takacs, I., Hell, M., Bowden, G., Deur, A.,
Shaughnessy, M. (2007). Key Parameters for Control of DEMON
DeammonificationProcess. Wat. Practice
Comparison of Technologies
Post Aerobic Digestion Anammox
Target Flow Stream Entire anaerobic Dewatering liquors
digestion effluent
Nitrogen Removal Nitrification/ Partial Nitritation/
Method Denitrification Deammonification
- Carbon Input Degradable material Not needed
from anaerobic digestion
- Aeration Intermittent Intermittent
Biomass Used Conventional Specialized
Methodology
Pro2D2 whole plant simulator:
– Baseline – PAD – Anammox
CPES cost estimating system
Assumptions:
mg/L Influent Effluent
– 75.7 ML/d (20 mgd) Limitation
BOD 250 10
– Aeration Basins:
TSS 240 10
• 5-stage Bardenpho
VSS 192
• 8.5 day SRT
TKN 39
– Biosolids facilities:
NH3 30 1
• 24/7 operation
TN 39 5.0
• Disposal via land
TP 6 1.0
application
Baseline PFD
-No Sidestream Treatment
PRIMARY
RAW INFLUENT SCREENING AND CLARIFIERS AERATION BASINS SECONDARY FILTRATION
PUMP STATION GRIT REMOVAL CLARIFIERS
PLANT
An-
aerobic Anoxic Aerobic Anoxic Aerobic EFFLUENT
Recycle
RAS
S
A
W
GRAVITY BELT
GRAVITY THICKENER sh
THICKENER wa
k
c
GraSvuitpye Trnhaictaknetner T ATE ThWickAeSned ADNIGAEESRTOIOBINC Ba BELPTR FEISLSTER
BR
GT
L
FI
BIOSOLIDS
Thickened Primary Solids
e
at
Filtr
Post Aerobic Digestion PFD
PRIMARY
RAW INFLUENT SCREENING AND CLARIFIERS AERATION BASINS SECONDARY FILTRATION
PUMP STATION GRIT REMOVAL CLARIFIERS
PLANT
An-
aerobic Anoxic Aerobic Anoxic Aerobic EFFLUENT
Recycle
RAS
S
A
W
GRAVITY BELT
GRAVITY THICKENER sh
THICKENER wa
k
GraSvuitpye Trnhaictaknenter T ATE ThWickAeSned ADNIGAEESRTOIOBINC PODSIGT EASETRIOONBIC Bac BELPTR FEISLSTER
BR
GT
L
FI
BIOSOLIDS
Thickened Primary Solids
e
at
Filtr