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SUEZ Advanced Solutions now offer Advanced Aeration Control solutions for energy efficiency and process optimisation in wastewater treatment plants. The innovative "atl platform", in collaboration with our technology partner Sisltech, is an advanced aeration control based on direct measurements and can be adapted to any plant configuration.

atl provides effective strategy methods for the operation and optimum performance of municipal and industrial Effluent Treatment Plants with biological treatment, ensuring compliance at the lowest energy cost.

The atl platform provides integrated management of key processes, including the aeration system, internal and external activated sludge recirculation, chemical dosing, storm tank, codigestion, cogeneration, etc.


  • Flexible and adaptable solutions tailored to any biological treatment (any reactor configuration, aeration system and flow rate)
  • Innovative controls, developed in-house, based on mathematical and artificial intelligence models
  • Improves the operating processes by defining best operative approach
  • 100% compliance with treated effluent quality requirements
  • Save an average of 20% - 25% of aeration system kWh consumption
  • Reduce total aeration system energy costs by average of 25% - 30%
  • Flexible commercial model based on energy savings
  • High programming capacity, enabled by the architecture using a PC server
  • Tailored to each specific plant and customer requirements

Lynne Bouchy Contact

The “atl platform”

  • Direct on-line measurements for effective and reliable process control (N-NH4, N-NO3, turbidity, O2, etc.)
  • Real time data processing for continuous wastewater treatment process evaluation (nitrification and denitrification, carbon removal, air production and distribution, chemical dosing, etc.)
  • Dynamic strategies to manage influent variations and ensure most efficient plant conditions and methanol dosing, energy and equipment cost reductions) to deliver maximum quality requirements
  • Integrated management of the aeration system and other key processes: internal and external activated sludge recirculation, chemical dosing, balancing tank, CHP, etc.

The Advanced Aeration Control solution adapts to any plant taking into consideration variables such as quality requirements, influent characteristics, tariff periods, operator expertise etc. The plant therefore has its own customised strategy for optimising the treatment process with the greatest possible economic efficiency, based on the following strategies:

  • Fixed Quality Strategy to maintain a predetermined quality effluent in real time
  • Energy Tariff Strategy to adapt to dynamic tariffs (such as Triad periods). This operational strategy defines the aeration intensity of the biological reactors by taking into account the fluctuating prices of different energy tariff periods, reducing energy consumption and cost of kWh consumed.


The WWTP in Lllobregat treats flow of 420,000 m3/d. The challenge of this project was to reduce the energy consumption, whilst maintaining the solids and nutrient quality requirements for water reuse.
The ATL control system allowed the WWTP to reduce:

  • up to 35% of the energy consumption and up to 41% of the aeration energy cost
  • up to 43% of the ratio of energy consumption per kg of removed COD


The treated flow of this WWTP in Cehegin is 7,000 m3/d. Aqualogy was asked to reduce the costs of aeration while ensuring the effluent quality. After the implementation of the atl platform we achieved:

  • optimisation of the aeration supply
  • 100% quality requirements
  • 42% reduction in energy costs, 5% of which was achieved by moving the peak energy consumption to night periods, when energy costs were lower


This WWTP in Santiago, Chile, treats 760,000 m3/d. After an increase of 50,000m3/d of the inflow, a tool was required to minimise the aeration costs and control the quality in real time. The atl platform allowed for:

  • full compliance with the river basin discharge limits as a result of the real-time control of the turbidity level
  • reduction of the aeration system’s energy consumption by 18%


This WWTP in Olot treats 10,000 m3/d. Due to the high variability of influent load, high aeration energy consumption was required to ensure effluent quality. The atl platform achieved:

  • optimisation of the aeration supply
  • compliance with the river basin discharge limits
  • reduction of the aeration system energy cost by 25%, 5% of which was achieved by moving the energy peak consumption to night periods, when energy costs are lower