The atl platform optimizes wastewater treatment and guarantees efficient plant performance at a minimum cost.

The cutting-edge advanced control solution atl is a leading technology implemented in more than 100 WWTPs worldwide. The flexibility of the system enables it to be implemented in plants of any size, setup and quality requirements.

 atl characteristics:

• Integrated management of key processes: Aeration system, internal and external re-circulation, reactive chemical dosing, etc.

• On-line evaluation and control of water treatment processes: Nitrification-denitrification, carbon removal, air production and distribution, chemical dosing, etc.

• Flexible and adaptable solutions: Compatible with WWTPs of any size, setup, or aeration equipment.

• Remote control platform: Consequently, remote control for the continuous supervision of wastewater treatment processes.

• Platform robustness and reliability (24/365): Numerous security protocols are adopted to ensure precise WWTP performance:

• Signal reliability: Signal prognosis is incorporated to verify the correct functioning of measuring instruments.

• Redundant control system: In the event of communications breakdown, control strategies are automatically implemented through pre-configured SCADA set points.

•  Advanced alarm management system incorporated.

The atl platform, based on advanced and intelligent controls, implements integrated management of WWTP with the aim of improving processes and reducing costs.

The solutions developed are based on the customization and implementation of multiple control strategies that work in parallel to adapt to the characteristics and needs of every WWTP:



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Water line:

  • Nutrient removal

    Based on ammonium and nitrate evolution in the effluent and mindful of energy tariffs, this control provides the most appropriate oxygen set point to ensure high wastewater quality, in terms of nutrient levels is delivered at the lowest energy prices.

  • Internal recirculation

    Adjusts internal recirculation to the levels of nitrate after biological wastewater treatment and/or retention in the anoxic chambers.

  • Advanced energy

    Based on tracking energy measurements, it provides information to the other controls and determines specific process/equipment ratios that enable detection of problems, breakdowns and deviations.

  • External nitrogen

    Adjusts dosage of an external source of nitrogen in WWTPs with an excessive COD/N ratio, which hinders cell synthesis due to lack of nutrients.


  • Carbon removal

    Based on effluent turbidity and/or TOC, provides the most appropriate oxygen set point to ensure wastewater quality, in terms of organic matter removal, with minimum energy consumption.

  • External recirculation

    Mixed liquor recirculation is adjusted to the wastewater treatment plant’s flow and to its capacity for sedimentation sludge in the decanter.

  • Chemical phosphorus

    It adjusts coagulant dosage to the evolution of the orthophosphate concentration or total phosphate in the treatment-plant effluent.

  • Homogenization tanks

    To widen the scope of the nutriEn control system, the homogenization tank operates as a time-of-use tariff, storing water when energy costs are more expensive and feeding it to the biological treatment system when the energy tariff is cheaper.


  • Air production
    and distribution

    Based on process oxygen demand, it provides a strategy to guarantee oxygen levels, ensuring better system efficiency.

  • Energy management

    Based on tracking theoretical measurements, it records information and feeds the other controls with the most appropriate energy consumption practice according to the energy tariff plan (cost kWh).

  • External input
    of organic carbon

    Adjusts dosage of an external source of organic carbon in WWTPs that has low denitrification due to lack of organic matter in influent wastewater (low COD/N ratio).

  • Others

    Design and implementation of controls to meet the specific needs of each process.

Sludge line:

  • Anaerobic digestion

    Based on real time monitoring of the main operating parameters (mass load, VFA/ALK ratio, biogas production, etc.), water treatment capacity is optimized and the reduction of organic matter and biogas production are maximized.


  • Sludge line

    Based on the measurement of the level and concentration of solids in different units of the process, mass balancing is carried out and the operating strategy to optimize the entire sludge line is defined: capacity of units for thickening is increased; reduction of the return sludge flow is maximized; energy consumption associated with return flow treatment is reduced; sludge dehydration capacity is increased, etc.

Co-digestion line:

  • Anaerobic co-digestion

    Based on the evolution of biogas production, this control determines co-substrate dosage for anaerobic co-digestion, maximizing biogas production.


  • Cogeneration

    Based on the biogas production and the power generation set point, this control defines the cogeneration engine operating strategy to maximize power generation and/or adapt it to plant consumed power.


Results obtained:

The advanced control solution atl is implemented in more than 100 municipal and industrial WWTPs. The results obtained in these plants are:

All WWTPs equipped with the atl platform are able to optimize processes and energy costs.

SISLtech -  Xaloc 1, 2nd floor – 08150 Parets del Vallès (Barcelona – Spain)

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