Greenbass™

PRECISELY CONTROLLED ENERGY CONSUMPTION FOR WASTEWATER TREATMENT PLANTS

URBAN

WASTEWATER

REGULATION OF SEQUENCED AERATION

FOR ACTIVATED SLUDGE

P-PPT-ER-010-EN-1107

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CONTENTSUrban

Wastewater

Greenbass™

• Energy, a major issue in water treatment

• Greenbass™ Objectives

• Operating Principle

• Advantages of Greenbass™

• Some References

• Case Study: Tournus, FRANCE

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To fight against climate change:

• Reducing greenhouse gases

• Limiting the environmental impact

Controlling energy costs:

• Improving the energy balance of facilities

• Achieving energy self-sufficiency for some treatment plants

• Diversifying sources of energy

To meet stricter and stricter discharge standards:

• Better treatment quality but it can consume more energy

ENERGY, A MAJOR ISSUE IN WATER TREATMENT

Greenbass™

Urban

Wastewater

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• Reducing energy consumption due to the aeration of biological treatment basins:

– The elimination of excessive aeration peaks and energy waste.

– A reduction of 10 to 15% in energy consumption compared with classic regulation systems (clock system on theoretical bases ordissolved oxygen / redox sensors).

• Decreasing the operating costs of the water treatment plant

• Guaranteeing treatment quality comparable with existing processes:

– An accurate, real time indication of the nitrate and ammonium concentrations (main quality parameters of the treated water)

– Complete degradation of the nitrogenous components

Greenbass™

OBJECTIVES of Greenbass™Urban

Wastewater

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OPERATING PRINCIPLE (1/2)

Greenbass™ continuously adjusts the air flow provided to the tank as a function of the needs. The sensors immersed in the activated sludge directly and continuously

indicate the variation in the ammonium and nitrate concentrations.

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The advanced regulation program contains a patented algorithm which constantly recalculates the useful quantity of air as a function of the biological activity. It controls the starting and stopping sequences of the aeration and regulates the flow of the blown air.

The blower – which can be equipped with a regulator – diffuses fine air bubbles which aerate the activated sludge and nourish the bacteria responsible for the nitrification.

OPERATING PRINCIPLE (2/2)

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(-) Aeration regulated based on a redox potential or the dissolved oxygen concentration is imperfect.

(-) Systems coupled to a clock are indirect and partial.

(-) Redox potential sensors require weekly maintenance.

(-) In small plants, due to a lack of maintenance, the regulation often works in crippled mode.

(-) When the treatment is made reliable, this leads to excess aeration

COMPARISON WITH TRADITIONAL REGULATION SYSTEMS

Greenbass™

Urban

Wastewater

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• UNIVERSAL: the product is adjustable to all sizes of facilities, new or in operation.

• ADAPTABLE: Greenbass™ can be used with all air systems and all types of automated regulation. The air input can be with fixed or variable flow.

• UNIQUE: a patent was filed for the Greenbass™

algorithm.

• SIMPLE: the system offers simplicity of installation, maintenance and upkeep.

• ECONOMICAL: Greenbass™ allows for optimization of the cost reductions from the OPEX and CAPEX

Greenbass™ ADVANTAGES

Greenbass™

Urban

Wastewater

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SOME REFERENCES

Greenbass™NAME

OF SITE

SIZE OF

THE PLANT

COMMISSIONING

DATE

Dijon, France 400,000 PE 2010

Pau, France 190,000 PE 2011

Tournus, France 10,500 PE 2012

Saint Michel Chef Chef,France

65,000 PE 2012

Camphin Phalempin,France

7,700 PE 2012

Urban

Wastewater

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CASE STUDY:TOURNUS, FRANCE

CONTEXT:

• Construction of a new water treatment plant with a capacity of 10,500 PE

• Client: City of Tournus

• Commissioning: beginning of 2012

• Energy consumption: 700,000 kWh/year including about 50 % for the biological basin.

DESIGN:

• Treatment line: – Standard pretreatment,– Biological treatment (prolonged aeration

N-DN + physical-chemical dephosphatation)

– Clarifier

Specific features of the project:The City of Tournus, which was seeing increasing energy consumption at its current plant dating from 1979, sought for the future to receive certification of controlled energy consumption.

Expected treatment level: Total N 15 mg/L

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CASE STUDY:TOURNUS, FRANCE

15%energy savings

4.5tons of CO2 avoided per year