FULL SCALE DEMONSTRATION OF ENERGY...

FULL SCALE DEMONSTRATION OF ENERGY

POSITIVE SEWAGE TREATMENT PLANT

CONCEPTS TOWARDS MARKET PENETRATION

Funded bythe Horizon 2020

Framework Programmeof the European Union

Grant agreement No. 641661

YOUR FLUSH, OUR ENERGY

Stefansdottir & Dora

Veolia Water Technologies - AnoxKaldnes

170705 & POWERSTEP

Mainstream nitrogen removal through a two-stage MBBR

POWERSTEP is funded under the European Union Horizon 2020 Framework Programme.

Grant Agreement No. 641661

• Moving bed biofilm reactor (MBBR)

• Nitrogen removal

• ANITA Mox

• 2-stage concept

• Questions

Agenda

3



AnoxKaldnes MBBR technology

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• Microorganisms in the wastewaterdegrade organic matter (COD) nitrogen and phosphorus

• MBBR (Moving Bed Biofilm Reactor)

• Biological treatment unit based on biofilm principle

• ”Carriers” with a protected surfacewhere the biofilm can grow

• Compact solution with specializedorganisms efficient degradation



What is a biofilm?

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A biofilm is an aggregate of microorganisms (such as bacteria and micro animals) growing on a solid surface.



In the MBBR reactor

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Aerobic reactor Anoxic reactor



• Small footprint

• Robust biofilm

• Flexible reactor design

• Easy upgrade of existing plants

• Easy to operate and control

• No sludge return needed in most applications

Benifits of MBBR

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Carriers

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Nitrification and denitrification

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Anammox and deammonification

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• Desired:• Ammonium oxidizing bacteria (AOB)

• Anammox bacteria

• Deammonification:

• 𝑵𝑯𝟒+ + 𝟏. 𝟑𝟐𝑵𝑶𝟐

− + 0.66𝐻𝐶𝑂3− + 0.13𝐻+ →

𝟏. 𝟎𝟐𝑵𝟐 + 0.26𝑁𝑂3− + 0.66𝐶𝐻2𝑂0.5𝑁0.15 + 2.03𝐻2𝑂

• Unwanted:• Nitrite oxidazing bacteria (NOB)

Bacteria groups

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Different options for ANITA™Mox

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ANITA™Mox sidestream

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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)



Mainstream nitritation - anammox

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• Key challenges:

Lower temperature

Lower concentration

Maintain high activity of ammonium oxidazingbacteria (AOB)

Suppress nitrite oxidizing bacteria (NOB)

Maintain high activity of anammox bacteria



2-stage principals

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The concept is innovative because it’s ability to give high extraction of carbon for biogas production, nitrogen removal with low energy requirement and compact footprint and to omit or at least dramatically decrease the requirement for external carbon source.

POWERSTEP

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Overall picture

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N-reduction (no COD)COD-reduction Energy positive

Energy from biogas

Z-MBBR

(nitritation)

ANITA Mox

(anoxic)

NH4 NO2 NH4 + NO2 N2

High rate AS (2016)8

Hydrotech Discfilter (2017)



Plant Design – Sjölunda WWTP (Sweden)

4 x 50 m3 MBBRs



Biofilm control – Z carrier

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1

2

3 4



Nitritation – Anammox

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Z 200

Z 400

• The first reactor optimized for AOB biofilm

• Aerated continuously / intermittent• Mechanically mixed• Optimal conditions are [NH4]=[NO2]

and low/no [NO3]

• The second reactor optimized for anammox biofilm

• Anoxic• Mechanically mixed



Advanced control strategy

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Acknowledgement

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POWERSTEP is an innovation action project supported by

the European Union under the Horizon 2020 Framework

Programme.

Contract no. 641661

Duration: 1/07/15 – 30/06/18

FULL SCALE DEMONSTRATION OF ENERGY

POSITIVE SEWAGE TREATMENT PLANT

CONCEPTS TOWARDS MARKET PENETRATION

Funded bythe Horizon 2020

Framework Programmeof the European Union

Grant agreement Nr. 641661

www.powerstep.eu

Stefansdottir & Dora

Veolia Water Technologies - AnoxKaldnes

[email protected]

FULL SCALE DEMONSTRATION OF ENERGY...

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