The AmphidromeTM Wastewater Treatment System
Transcript of The AmphidromeTM Wastewater Treatment System
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ONSITE TREATMENT
Amphidrome®
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Agenda
• System Description
• Installation
• Locations
• Performance
• Questions
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Amphidrome®
• Definition in Oceanography
–The position in the ocean where the tide
vanishes to zero
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Amphidrome®
• Definition in Wastewater
–A submerged attached-growth bioreactor
(SAGB) in which the nitrogen vanishes to
nearly zero
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Amphidrome® Process Description
• Biological Nutrient Removal (BNR) Process
– TSS
– BOD5
– Total Nitrogen
– Oil and Grease
• One Reactor
– A submerged attached growth bioreactor (SAGB) operating in sequencing batch mode
– SAGB is also commonly referred to as a BAF (biological aerated filter).
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System Consists Of 2 Tanks And 1 Reactor
• Anoxic / Equalization Tank
• Amphidrometm Reactor
• Clear Well Tank
Treated WaterWaste Water
Anoxic / Equalization
TankReactor Clear
Well
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Anoxic/Equalization Tank
• Solids settling
• Sludge storage
• Secondary functions– Buffers the dissolved oxygen in the
recycled flow
– Mixes recycle with influent organic
carbon to promote de-nitrification
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Main Reactor Function
• Media provides the surface area for biofilm growth
• Provides solids separation, eliminating the need for downstream clarification
• Intermittent aeration
– Typically 3 minutes on 15 minutes off
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Clearwell Function
• Stores batch volume
• Stores some fraction of backwash
volume
• Contains backwash and effluent
pumps (or Plus™ feed pumps)
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Control Panel
• Touch Screen
• Remote Access
• Operator Can
‘tune’ the system
Controls
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Amphidrome® System Benefits
• Highest Level of Nitrogen Removal of
any system available
• Low Visual Impact
• Not affected by air temperature
as are trickling filters
• All effluent filtered through deep sand bed
to protect SAS
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Installation
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Three-tank
system
Reactor
Clear Well
Anoxic
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NANTUCKET, MASSACUSETTS
SINGLE FAMILY HOME
REACTOR COVERS
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MEADOWS AT MAINSTONE
BELOW GRADE SYSTEM
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OCEAN EDGE CONFERENCE CENTER
REACTOR COVERS
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BELOW GRADE
SYSTEM
OCEAN EDGE CONFERENCE CENTER
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HEALTH CARE FACILITY
REACTOR COVERS
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Where can you find us?
• New England
• Pennsylvania
• North Carolina
• Maryland
• Minnesota
• Internationally
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Performance
BOD5 TSS Total N
Permit Limit 30 mg/L 30 mg/L 10 mg/L
Average 5.07 mg/L 6.3 mg/L 4.79 mg/L
• Plant: Pleasant Bay Nursing Home
• Location: Brewster, MA
• Design Flow: 26,500 gpd
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Performance
• Plant: Daniel Hand High School
• Location: Madison, CT
• Design Flow: 25,000 gpd
BIOCHEMICAL
OXYGEN DEMAND
TOTAL SUSPENDED
SOLIDS
TOTAL
NITROGEN
INFLUENT 174 mg./L. 137 mg./L. 90 mg./L.
EFFLUENT 9.5 mg./L. 8.2 mg./L. 6.8 mg./L.
PERMIT LIMIT 30 mg./L. 30 mg./L. 10 mg./L.
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Performance
• Plant: Chili’s Resturant
• Location: Hingham, MA
• Design Flow: 7,670 gpd
BOD5 TSS Total N
Permit Limit 30 mg/L 30 mg/L 25 mg/L
Average 4.9 mg/L 8.2 mg/L 5.4 mg/L
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Performance
• Plant: Traditions Condos
• Location: Wayland, MA
• Design Flow: 10,320 gpd
Traditions (Condominium)
DEP Permit # 0-638
0
10
20
30
Nov-01 May-02 Dec-02 Jun-03 Jan-04 Aug-04 Feb-05 Sep-05 Mar-06
Date of Sample
Eff
luen
t T
ota
l N
(m
g/l
) Total N (mg/l)
Discharge Limit
BIOCHEMICAL
OXYGEN DEMAND
TOTAL SUSPENDED
SOLIDS
TOTAL
NITROGEN
PERMIT LIMIT 30 mg./L. 30 mg./L. 19 mg./L.
EFFLUENT 10.22 mg./L. 15.34 mg./L. 7.04 mg./L.
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Questions
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Amphidrome®
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Process Chemistry
• Biochemical Transformations
– CH2O + 0.309 O2 + 0.085 NH4+ + 0.289 HCO3
-
0.535 C5H7O2N + 0.633 CO2 + 0.515 H2O (aerobic)
– NH4+ + 3.30 O2 + 6.708 HCO3
- 0.129 C5H7O2N +
3.373 NO3- + 1.041 H2O + 6.463 H2CO3 (aerobic)
– NO3- + 0.324 C10H19O3N 0.226 N2 + 0.710 CO2 +
– 0.087 H2O + 0.027 NH3 + 0.274 OH- (anoxic)
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Oxidation:
COH + O2 + Bacteria CO2 + other end products + energyorganic matter
Cell Synthesis:
COHNS + O2 + Bacteria + energy C5H7NO2
organic matter new bacterial cells
Endogenous Respiration
C5H7NO2 + 5 O2 5 CO2 + NH3 + 2 H2O + energy-
• Oxidation of Carbonaceous BOD:
BNR - Process Chemistry
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Process Chemistry
• Oxidation of Nitrogen Based Compounds
NH+4 + 3/2 O2 NO-
2 + 2H+ + H2O Nitrosomonas Bacteria
ammonium nitrite
NO-2 + 1/2 O2 NO-
3 Nitrobacter
nitrite nitrate
Overall Energy Reaction:
NH+4 + 2 O2 NO-
3 + 2H+ + H2O
ammonium nitrate
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•Reduction of Nitrite & Nitrate:
The nitrate reducing bacteria are facultative anaerobic heterotophs. Therefore, an
organic carbon source is required. For the following equations methanol has been
used as the carbon source.
First Energy Reaction:
6 NO-3 + 2 CH3OH 6 NO-
2 + 2 CO2 + 4 H2O
nitrate methanol nitrite
Second Energy Reaction:
6 NO-2 + 3 CH3OH 3 N2 + 3 CO2 + 3 H2O + 6 OH-
nitrite methanol nitrogen gas
Process Chemistry - Continued
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Heterotrophic Cell Synthesis:
3 NO-3 + 14 CH3OH + CO2 + 3 H+ 3 C5H7O2N + H2O
nitrate methanol Biomass
Overall Nitrate Removal
NO-3 + 1.08 CH3OH + 3 H+ 0.065 C5H7O2N + 0.47 N2 + 0.76 CO2 + H2O
nitrate methanol Biomass
Process Chemistry - Continued