Nitrogen & phosphate control system
Liquiline Control CDC81

Efficiency improvements and cost savings for wastewater treatment plants

Liquiline Control CDC81 is the solution for reliable and safe outlet values combined with energy and cost savings in your wastewater treatment plant. It provides dynamic, load-based control of the biological treatment and of the precipitant pumps during phosphate elimination. Liquiline Control can control multiple biological stages at the same time and enables seamless and quick integration into your existing environment thanks to digital bus and remote technologies.

CDC81 is the solution for reliable and safe outlet values in your wastewater treatment plant. ©Endress+Hauser

Liquiline Control CDC81 is the solution for reliable and safe outlet values in your wastewater treatment plant.

Via a secure VPN connection the control system can be accessed with a tablet or smartphone. ©Endress+Hauser

Via a secure VPN connection the control system can be accessed with a tablet or smartphone, allowing you to manage the measured values and parameters regardless of location and weather conditions.

Operate the aeration control and the phosphate precipitation from your process control center. ©Endress+Hauser

Operate the aeration control and the phosphate precipitant dosing from your process control center and/or ...

The nitrogen and phosphate control system can be operated on site via a touchscreen display. ©Endress+Hauser

... via an on-site display. You can use an own monitor or we can supply you with a touchscreen display.

Efficient and reliable nutrient decomposition

An active controller detects the rate of change of the nitrification process, thus determining the direct behavior of the biology in intermittent phases. The system dynamically adjusts the oxygen set point with respect to the nutrient concentration. Simply put: high load equals high oxygen setpoint and low load equals low oxygen setpoint. In the case of continuously driving blowers, a feed-forward control strategy is used: this compensates for swift load changes via predictive preparation.

Load-dependent, chemical phosphate elimination

The Liquiline Control uses continuous flow rate and phosphate measurement to control your dosing pump and to ensure efficient phosphate elimination. It can thus quickly adjust precipitant dosing in the case of changing loads or flow rates. This ensures the most efficient phosphate conversion, which means that you use less precipitant and therefore reduce cost. In addition, optimized precipitant dosing prevents increased salting of the biology and increasing volumes of sludge.

Process reliability and control

Thanks to continuous measured value and signal validation, Liquiline Control guarantees stable plant operation and reliable plant discharge. Should a measured value or even a blower fail, the system switches the affected control loops into a corresponding safety condition and sends error or warning messages. The original plant operation settings can be restored at any time via selector switch. Even after installation, plant personnel have full control of the process at all times.

Easy integration into existing plants

Liquiline Control is designed as a modular, expandable system with architecture primarily based on a programmable logic controller (PLC) and individual signal interfaces. Available as a stand-alone solution or decentralized in various housing configurations, this flexibility allows for quick and easy integration into existing process control systems, as well as incorporation of existing instrumentation.

Easy-to-use remote access

Using fieldbus technology, Liquiline Control retransmits all remote measurement data to a central point such as your control room. This enables you easy monitoring of the processes and adjustment of the control. Furthermore, process monitoring via secure VPN is particularly quick and simple. This allows your treatment plant staff to manage the measured values and parameters regardless of location and weather conditions.

Liquiline Control - features

  • Oxygen control with automatic load detection and concentration adjustment

  • Simultaneous monitoring of multiple biological stages

  • Validation of measured values and sensor signals

  • Local, self-contained control unit or integration into existing PCS

  • Continuous or intermittent operation of the biological stage including from base load to peak load

  • Predictive control strategies for attenuating load spikes

  • Flush load for long denitrification phases

  • Chemical phosphate elimination

  • Remote access

Liquiline Control - measuring technology

  • Oxygen measurement

  • Ammonium and nitrate measurement

  • Phosphate measurement

  • Flow measurement

Liquiline Control - services

  • Commissioning

  • Optimization during operation

  • Application trainings

  • Remote maintenance

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