Transcript DEMON Reactor - Stjernholm A/S

DEMON
Sustainable Nitrogen Removal with Deammonification
HenkWim de Mooij
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DEMON: stable and sustainable N-removal
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Developed at Innsbruck
University, Austria
Full scale experience since
2003 at Strass WWTP
Nine full scale installations
in operation in Europe, six
under construction (mostly
references on liquors from
municipal sewage sludge)
Technology under license
from University of
Innsbruck (Dr. Bernhard
Wett)
Side stream treatment implemented
Primary
sedimentation
Activated
sludge
influent
Final clarifier
effluent
Digester
Dewatering
Liquor
Treatment
Sludge
Return Liquors
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Nitrogen Cycle
Reduced Organic
N-components
N-Assimilation
(plants, microorganisms
N-Assimilation
(plants, microorganisms
Denitrification
NO3-
NO2-
N2
NH3
DEMON
N2O
Nitrification
(Nitrobacter)
Microbial
degradation
N-fixation
SHARON
Nitritation
(Nitrosomonas)
NO24
Traditional biological nitrogen removal
1 mol NO3C-source → sludge
CO2 → sludge
O2
1 mol NO2-
1 mol NO2C-source → sludge
CO2 → sludge
O2
1 mol NH4+
0.5 mol N2
DEMON nitrogen removal: deammonification
Aerated period
1 mol NO3-
1.25 NH4+ + 1.25 O2
1.25 NO2-
C-source → sludge
CO2 →
2.25sludge
NH4+
Anoxic period
0,5 mol NO2CO2 → sludge
NH4+ + 1.25 NO2-
O2
N2 + 0.25 NO3- + 2 H2O
1 mol NO2CO2 → sludge
C-source → sludge
0,5 O2
1 mol NH4+
0.5 mol N2 + 0.1 mol NO3
How does it work?
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DEMON characteristics
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Standard SBR configuration
Low energy requirement, as only 55% of ammonia is oxidised
to nitrite;
No requirement for an external source of carbon (such as
methanol);
Low sludge production;
Stable process due to pH control, process adjusts to changes
in flow and load automatically;
No sensitivity to phosphate in sludge liquors, no pre-treatment
required.
DEMON Control
Control aeration
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Sufficient oxygen for nitrification
Oxygen level limiting for Nitrite oxidizing bact.
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0.3 mg/l O2
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pH control
Control nitrification process
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Cyclone
Produce nitrite for deammonification process
Avoid inhibition due to excess nitrite
Control sludge age
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Sufficiently long for
anammox to grow (>20 days)
Too short for NOB to grow
pH Control of nitrification
- Oxygen
- pH
Using pH for nitrite control
- Oxygen
- Nitrite
Cyclone for sludge age control
Surplus sludge discharge (NOB)
Surplus sludge
Sludge return
to reactor
(anammox bacteria)
DEMON references (operational)
Location
Year
Capacity
Liquor source
Heidelberg, D
2008
480 m³/d, 600 kg/day NH4-N
Mesophilic digested sludge
Thun, CH
2008
300 m³/d, 400 kg/day NH4-N
Mesophilic digested sludge
Glanerland, CH
2007
250 m³/d, 250 kg/day NH4-N
Mesophilic digested sludge
Strass, A
2004
250 m³/d, 500 kg/day NH4-N
Mesophilic digested sludge
Plettenberg, D
2007
100 m³/d, 80 kg/day NH4-N
Mesophilic digested sludge
Limmattal, CH
2010
250 m³/d, 250 kg/day NH4-N
Mesophilic digested sludge
Etappi Oy, Fi
2009
330 m³/d, 990 kg/day NH4-N
Biogas production
Balingen, D
2009
400 m³/d, 192 kg/day NH4-N
Mesophilic digested sludge
Zalaegerszeg, Hu
2010
160 m³/d, 160 kg/day NH4-N
Mesophilic digested sludge
Gengenbach, D
2008
50 m³/d, 50 kg/day NH4-N
Mesophilic digested sludge
Apeldoorn, NL
2009
1270 m³/d, 1690 kg/day NH4-N
Mesophilic digested sludge
DEMON references (under construction)
Location
Kecskemet, Tu
Year
Capacity Liquor source
1300 kg/day NH4-N Mesophilic digested sludge
Kokkola, Fi
600 kg/day NH4-N Mesophilic digested sludge
Lahr, D
235 kg/day NH4-N Mesophilic digested sludge
Erpfendorf, D
120 kg/day NH4-N Mesophilic digested sludge
Alltech, D
Rickenbach, D
2400 kg/day NH4-N Biogas/yeast
50 kg/day NH4-N Dairy
Nieuwegein, NL
450 kg/day NH4-N Mesophilic digested sludge
Amersfoort, NL
600 kg/day NH4-N Mesophilic digested sludge
Apeldoorn Sludge Treatment
DEMON LTP
Digesters
CHP
DEMON Nieuwegein
Design Basis DEMON Nieuwegein
Parameter
Unit
Average
Max
Peak
Flow
m3/d
258
420
480
NH4-N
mg/l
1.059
1.012
1.012
kg/d
273
425
486
Batch proces DEMON
No. of cycles per day
:
4
Cycle volume
:
120
Cycle time
:
6
h
1. Fill + Aerate phase
:
4,5
h
1. Settlement phase
:
0,75
h
1. Discharge phase
:
0,75
h
m³/cycle (peak)
DEMON reactor
Process Flow Diagram
DEMON Reactor
Cyclone
Surplus
sludge
DEMON
effluent
Filtrate
Break Tank
Filtrate
Buffer Tank
G.A. Drawing
DEMON reactor Nieuwegein WWtP
Buffer tank in reactor
Aerated / Anoxic zone in reactor
DEMON Cyclone
Thank you for your attention
ANY QUESTIONS?
[email protected]
[email protected]
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