experience from start-up and operation of anita™ mox ... · biofarm seeding strategy = quicker...

Experience from start-up and

operation of ANITA™ Mox plants and development of a new

Hybas™ ANITA™ Mox process

Nitrogen Removal Technologies 15th May Leeds

Romain Lemaire (Veolia Water, Paris) Magnus Christensson (AnoxKaldnes) Bruno Bigot (Veolia Water Solutions & Technologies UK)

COD

O2

NO3-

AOB

COD

Heterotrops

NH4+

NO2-

NOB

55%

45%

Anammox Bacteria

N2 + NO3-

Anammox

NH4+

NO2-

89% 11%

O2

(40%)

Anoxic Aerobic

O2

COD

(0%)

Principle – ANITA™ Mox

1-stage Deammonification -60% O2 -100% COD

ANITA™ Mox – MBBR process

Biofilm Media

Liquid

Nitritation

NH4+

NO2- AOB

Anammox

N2 O2

Aerobic

Anoxic Simultaneous in biofilm

MBBR

High sludge retention time (SRT) needed

Necessity to protect anammox bacteria (O2 / NO2) Biofilm

Necessity to keep bacteria into the system (avoid washout)

Maximum robustness and stability desired

ANITA™ Mox – Sjölunda WWTP, Malmö (Sweden)

4 x 50m3 = 200m3

Sjölunda WWTP reject water Capacity = 200 kgN/d 800-1200 mgN-NH4/L 1st ANITA™ Mox reference Flexibility for fullscale testing

K3 500 m2/m3

K5 800 m2/m3

BiofilmChip M 1200 m2/m3

ANITA™ Mox – Different Media tested

MBBR = Media + Grid No risk of losing Anammox biomass

ANITA™ Mox – BioFarm concept

BioFarm concept = Providing seeded carriers for rapid start-up of

future full-scale ANITATM Mox units

Seeded carriers

New carriers during start-up

0

0,1

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1,1

1,2

1,3

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0 50 100 150 200 250 300 350 400 450 500 550 600

NH

4 lo

ad &

rem

ova

l rat

es (

kgN

/m3

.d)

15

17

19

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23

25

27

29

31

33

35

T°C

NH4-N loadNH4-N remT°C

BioFarm – N-load / NH4-rem

130

1.1 kgN-NH4/m3.d in 4 months with only 3% seeding

reject water supply limitation

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10

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30

40

50

60

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100

0 50 100 150 200 250 300 350 400 450 500 550 600

Days

NH

4 &

TN

re

mo

ved

(%

), N

O3

/NH

4

TN removal %

NH4 removal %

% NO3-prod / NH4-rem

BioFarm – Performance

11

90

80

90% NH4 removal and 80% TN removal

Patented DO control strategy reduce NO3 production <11%

1.4 – 1.7 kWh/kgN-NH4 removed

• 350 kgN/d 430 kgN/d reject water

• Existing 350m3 SBR MBBR

• K5 carrier (AnoxKaldnes)

• Quick seeding (13% from BioFarm)

• Started in January 2012

ANITA™ Mox – Sundets WWTP, Växjö (Sweden)

Fine

bubble

aeration

3.5m

depth

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50

100

150

200

250

300

350

400

450

500

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0,05

0,1

0,15

0,2

0,25

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0,35

0,4

0,45

0,5

0,55

0,6

0,65

0 30 60 90 120 150 180 210 240 270 300 330 360 390 420 450 480

Re

ject

wat

er

flo

w (

m3

/d)

NH

4 lo

ad &

NH

4 r

em

ova

l rat

e (

kgN

/m3

.d)

Days

NH4-N load

NH4-N rem

Reject Water Flow (m3/d)

Växjö – N-load / NH4-rem

Treating all reject water after only 30 days (with 13% seeding)

0.4-0.5 kgN/m3.d ½ design N-load expected Co-digestion 2013

Design Flow = 350 m3/d

Real Flow = 150-200 m3/d

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40

0%

10%

20%

30%

40%

50%

60%

70%

80%

90%

100%

0 30 60 90 120 150 180 210 240 270 300 330 360 390 420 450 480

T°C

%N

H4

rem

, %TN

rem

, rat

io N

O3

/NH

4

Days

TN removal %

NH4-N removal %

ratio NO3-prod/NH4-rem

T°C

Växjö – Performance

90% NH4 removal and 80% TN removal

DO control strategy reduce NO3 production <11%

90

80

y = 0,88xR² = 0,97

0

0,1

0,2

0,3

0,4

0,5

0,6

0 0,1 0,2 0,3 0,4 0,5 0,6 0,7

NH

4 r

em

ove

d (

kgN

H4

-N/m

3.d

)

NH4 load (kgNH4-N/m3.d)

Växjö – N-load vs NH4-removal

88% NH4 removal since start-up

• 120 kgN/d (reject water + leachate)

• Retrofitting 600m3 existing tank

• Quick seeding (BioFarm)

• Commissioning June 2012

ANITA™ Mox – Holbæk (DK)

Leachate storage tank (= 600m3)

ANITA™ Mox

Landfill

0.00

5.00

10.00

15.00

20.00

25.00

30.00

35.00

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100

0 50 100 150 200 250 300 350

T°C

% N

-re

mo

val

Days

N-removal % % N-NH4 % NO3-N produced to NH4-N removed Temperature

Holbæk – Performance

DO regulation “Off”

80% NH4 removal even at 15°C

Patented DO control strategy very efficient to keep NO3 <11%

ANITA™ Mox – Grindsted, Denmark

50 000 tons/year to BioPasteur® digester: • 45% of DS from wastewater sludge

• 35% of DS from organic household waste

• 20% of DS from organic industrial waste

• 110 kgN/d reject from co-digester

• 140 m3 (new tank)

• Quick Seeding (BioFarm)

• Start-up May 2013

ANITA™Mox –James River WWTP, Newport News, VA US

• 250 kgN/d reject water

• Retrofit of existing tank


• Start-up Q3 2013

• Existing HybasTM system

60,200m3/d

ANITA™ Mox – South Durham, North Carolina US

• 890 mg/L ammonia reject water

combination of HRSD sludge

• 284 m3/d flow


• Seeding (BioFarm)


• Plant has existing HybasTM

system 60,200m3/d

ANITA Mox

• 333 kgN/d reject water




• 3 years payback

• US based BioFarm

MBBR

BiofilmMedia

Liquid

Nitritation

NH4+

NO2-AOB

Anammox

N2O2

Aerobic

AnoxicBiofilm

Media

Liquid

Nitritation

NH4+

NO2-AOB

Nitritation

NH4+

NO2-AOB

Anammox

N2

Anammox

N2O2O2

Aerobic

Anoxic

= 0.5-1.5

mg/L

Biofilm Media

Liquid

Nitritation

NH4+

NO2-

AOB

Anammox

N2O2

AnoxicMedia

Liquid

Nitritation

NH4+

NO2-

AOB

Anammox

N2O2

Anoxic

< 0.5

mg/L

Flocs (1-3 g/L)

MBBR

AOB in flocs = less NO2- limitation AOB in biofilm = NO2

- limitation

New Development – IFAS configuration IFAS

Bench-scale trial – IFAS and MBBR

19

Influent

Conditions

MBBR IFAS A

B

• AD Sidestream • NH4= 900 mgN/L • tCOD= 400 mg/L • BOD = 30 mg/L • tCOD/N = 0.4 • sbCOD/N = 0.25

• 30 oC • 43 % K5 carrier • Volume reactor = 7 L • D.O.IFAS= 0.2 mg O2/L • D.O.MBBR= 1.0 mg O2/L

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1

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3

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5

6

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8

9

10

0 20 40 60 80 100 120 140 160 180 200 220 240 260 280 300 320 340 360 380

N-r

em

(g

N/m

2.d

)

Time (days)

R1:N-Rem (gN/m².d) R2:N-Rem (gN/m².d)

Stage I R1: MBBR R2:MBBR

(150mg/L NH4-N)

Stage II R1: MBBR R2:IFAS (150mg/L NH4-N)

Stage III R1: MBBR R2:IFAS (70mg/L NH4-N)

Stage IV R1: MBBR R2:IFAS (30mg/L NH4-N)

Stage V R1: MBBR R2:IFAS (10mg/L NH4-N)

Hybas™ ANITA™Mox – Bench-scale

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ML

SS

(g

/L)

N-r

em

(g

N/m

2.d

)

Time (days)

R2:N-Rem (gN/m².d) MLSS (g/L)


(150mg/L NH4-N)






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ML

SS

(g

/L)

N-r

em

(g

N/m

2.d

)

Time (days)

R1:N-Rem (gN/m².d) R2:N-Rem (gN/m².d) MLSS (g/L)


(150mg/L NH4-N)






Expected IFAS design = 2-3 kgN/m3.d (x2-x3 pure MBBR)

0

1

2

3

0 2 4 6 8

N-r

em

ova

l (gN

/m2.d

)

N-NO2 (mg/L)


MBBR IFAS

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2

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6

8

10

0 5 10 15 20 25 30

N-r

em

ova

l (gN

/m2.d

)

N-NO2 (mg/L)

Higher NO2 concentrations in IFAS

Higher N-removal rates with higher NO2 concentrations

Optimum NO2 level depends of hydrodynamics condition

1.00E+05

1.00E+06

1.00E+07

1.00E+08

1.00E+09

1.00E+10

1.00E+11

1.00E+12

15 42 49 72 94 147 Time (days)

Anammox AOB Total Bacteria NOB

qPCR : Evolution (Anammox, AOB, NOB and total Bacteria)

24


MBBR

Suspended solids composition (MLSS)

IFAS MBBR

1. Stable SS composition in MBBR

2. Augmentation of Biomass in IFAS

3. Higher increase of AOB in IFAS (x1000!)

1.00E+05

1.00E+06

1.00E+07

1.00E+08

1.00E+09

1.00E+10

1.00E+11

1.00E+12

15 42 49 72 94 147 Time (days)

Anammox AOB Total Bacteria NOB


qPCR : Evolution (Anammox, AOB, NOB and total bacteria)

Biomass repartition IFAS vs MBBR

Anammox

Mode MBBR 99% 1%

Mode IFAS 96 % 4%

AOB

Mode MBBR 99% 1%

Mode IFAS 7% 93%

Total biomass

Mode MBBR 92% 8%

Mode IFAS 52% 48%

x 1 000 in IFAS

Biofilm MLSS

Hybas™ ANITA™Mox – IFAS configuration

Hybas™ ANITA™ Mox = Higher N-removal with combination of

carriers and suspended biomass

New Development – Mainstream N-removal

ANITA™ Mox Pilot trial on BOD-treated WW: • After BOD AS (Sweden)

• After UASB (Middle East)

3 different systems tested: • Pure MBBR

• IFAS

• Sequenced treatment of reject water and BOD-treated WW

ANITA™ Mox – Applications (MBBR & IFAS)

Municipal :

Sidestreams: • Anaerobic Digested Sludge centrate validated

• Thermal Hydrolysis* + AD centrate validated

Mainstream: (IFAS = easy retro fit) • Post anaerobic (UASB) under evaluation

• Post high-rate BOD-stage under evaluation

Industrial : • Landfill Leachates (old) validated

• Post anaerobic from Bio-composting (COD/N=2) validated

• Micro-electronic / Semi-cond validated

• Other Post anaerobic effluent (slaughterhouse, F&B) under evaluation

* (BiothelysTM, ExelysTM, CambiTM)

ANITA™Mox – Conclusion Stable and robust

Low OPEX + C-footprint :

• - 60% O2 / no COD dosing / 1.4-1.7 kWh/kgNrem / N2O < 0.5%

Efficient aeration control

• Continuous aeration no mixer / low N2O

• Keep NO3 < 11% no NOB (MBBR & IFAS)

N-removal performances :

• MBBR = >1 kgNrem/m3.d (Sidestream)

• IFAS = 2-3 kgNrem/m3.d (Sidestream)

BioFarm seeding strategy = Quicker Start-up

6 references :

• Malmö WWTP (Sweden) 200 kgN/d reject water 2010 • Växjö WWTP (Sweden) 430 kgN/d reject water 2012 • Holbæk WWTP (DK) 120 kgN/d reject water + leachate 2012 • Grindsted WWTP (DK) 110 kgN/d co-dig. sludge + food waste May 2013 • James River WWTP (USA) 253 kgN/d reject water Aug 2013 • South Durham WWTP (USA) 333 kgN/d reject water late 2013

THANK YOU !!

experience from start-up and operation of anita™ mox ... · biofarm seeding strategy = quicker...

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