Azurair™B-Twin

ODOR POLLUTION CONTROL WITH A SUSTAINABLE DEVELOPMENT APPROACH

AIRBIOLOGICAL TREATMENT OF HYDROGEN SULFIDE AND MERCAPTANS

P-PPT-A-002-EN-1107

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CONTENTS

Azurair™B-Twin

• Azurair™ B-Twin in the odor removal solutions range

• Description of the Azurair™ B-Twin technology

• Operating Principle

• Advantages of Azurair™ B-Twin

• Case Study: Chevrières Grandfresnoy, FRANCE

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Model Process Treated CompoundsAir Flow Rate(per unit)

Plant Size

Azurair™ B BiologicalH2S

(low and medium-level concentrations)

From300 to 20,000 Nm3/h

< 100,000 PE

Azurair™ B-Twin Biological in 2 stagesH2S

and mercaptansFrom 700 to 5,000 Nm3/h < 20,000 PE

Azurair™ Boost Biological Pretreatment+ physicochemical Polishing

H2S(high concentrations)

From 300 to 16,000 Nm3/h(Biofilter stage)

> 250,000 PE

Azurair™ C Physical & ChemicalSulfured and nitrogenous

compoundsFrom 3,000 to 80,000 Nm3/h

> 15,000 PE

Azurair™ B-Twin IN THE

ODOR REMOVAL SOLUTION RANGE

Azurair™B-Twin

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DESCRIPTION OF THE Azurair™ B-Twin TECHNOLOGY

Azurair™

B-TwinAcid pH tower for elimination of H2S + =

Neutral pH finishing tower for reinforced

elimination of mercaptans

Coupling of 2 identical Azurair™ B towersAzurair™B-Twin

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OPERATING PRINCIPLE

• The foul air extracted from the plenum is sent to the towers in series with the help of a fan.

• The air is introduced at the top of the first tower in which it goes through an acid pH biofilter which is mostly for elimination of H2S.

• The air is removed at the bottom of the tower.

• This is a co-current process with sequential sprinkling.

• This addition of water is optimally adjusted to ensure the development of bacteria and to compensate for the evaporation.

• This biofilter has an integrated washing system for efficient cleaning of the media, avoiding all clogging.

• The principle is repeated in the second “finishing”tower at neutral pH in order to optimally eliminate the mercaptans (and H2S).

Biological deodorization according to the trickling biofilter principle .

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SUSTAINABLE DEVELOPMENT:• A 100% biological solution• No chemical reagents use• Compact equipment

PERFORMANCE AND SAVINGS :• Up to 95% elimination of H2S and mercaptans• Advantageous investment and use costs compared with

other air treatment technologies.

EASE OF USE:• Inalterable mineral media (no replacement or reloading),• Natural process that does not require regulation,

Integrated system for unclogging of the media.

ADVANTAGES OF THE Azurair™ B-Twin

Azurair™B-Twin

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CASE STUDY: CHEVRIÈRES GRANDFRESNOY (60), FRANCE

CONTEXT:

• Reconstruction of a 5,000 PE WWTP

• Client: Syndicat intercommunal d'assainissement de Chevrières-Grandfresnoy

• Commissioning: 2012DESIGN:

• Ventilation flow: 3,200 Nm3/h• Excerpt from requested guarantees:- [H2S] < 0.1 mg/Nm3/h- [Mercaptans] < 0.07 mgS/Nm3

- [NH3] < 0.7 mg/Nm3/h

• Azurair™ B-Twin: speed of 1,200 m/h

RESULT:

• >94% of H2S and RSH eliminated

• Savings of 10 tons of bleach per year (if bleach tower chosen)

PROJECT DETAILS:

The water treatment plant, built in 1979, was dilapidated and frequently in hydraulic overload and consequently polluting the source receiving water - the Nancy brook.

In order to allow for the expansion of the collection network and to meet the new discharge standards, a new plant was designed.

As the new plant adjoins a residential area, the customer wanted biological odor treatment.

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CASE STUDY:

CHEVRIÈRES GRANDFRESNOY (60), FRANCE