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Removal of ammonium and nitrogen with Liquiline Control

Nitrogen removal from wastewater with Liquiline Control 

Safely comply with limit values for total nitrogen and ammonium by optimizing aeration in the biological treatment 

To ensure that nitrogen can be safely and efficiently removed from wastewater, the nitrification and denitrification processes must be optimally coordinated with each other. The nitrification process depends on the exact supply of oxygen at any given time. If too little oxygen is introduced into the biological treatment, the strict limit values in the outlet cannot be complied with. Running the compressors constantly at full speed will result in enormous energy consumption.

  • Up to 30 % energy savings in the aeration process

    The blowers in a wastewater treatment plant require enormous amounts of electricity – they account for up to 70 % of the plant's total energy requirements. Optimize your nitrogen removal by using Liquiline Control and tap into considerable savings potential. The automation system controls ammonium and nitrate removal based on the influent load and your individual limits for ammonium and total nitrogen. The result is reliable, energy-saving denitrification of the wastewater.

Liquiline Control automation solution for aeration processes ©Endress+Hauser

The Liquiline Control automation solution ensures that nitrogen and ammonium are always removed from the wastewater efficiently and in accordance with the limit values.

Dynamic control of aeration with Liquiline Control ©Endress+Hauser

Liquiline Control dynamically adjusts the speed of the compressors, e.g. in night-time low-load phases when only a small amount of air needs to be blown in.

Digital ammonium and nitrate sensor for measurements directly in the aeration basin ©Endress+Hauser

Efficient measurement directly in the basin with the digital ammonium and nitrate sensor ISEmax CAS40D.

Digital oxygen sensor with Memosens technology ©Endress+Hauser

Digital oxygen sensor with Memosens technology ensures excellent performance and process reliability for all aeration processes (SBR, Anamox, etc.).

Management of limit values and control parameters from the control room or on the move ©Endress+Hauser

Liquiline Control allows to manage limit values and control parameters, either from the control room or on the move, regardless of location.

Simultaneously control up to three independent zones for the biological stage ©Endress+Hauser

Benefit from simultaneous control of up to three independent zones of the biological stage – even remotely

Process map of nitrogen removal in wastewater treatment plants ©Endress+Hauser

Process overview of the biological treatment step

  • Liquiline Control automation solution for aeration processes
  • Dynamic control of aeration with Liquiline Control
  • Digital ammonium and nitrate sensor for measurements directly in the aeration basin
  • Digital oxygen sensor with Memosens technology
  • Management of limit values and control parameters from the control room or on the move
  • Simultaneously control up to three independent zones for the biological stage
  • Process map of nitrogen removal in wastewater treatment plants

How we can help 

The Liquiline Control automation solution dynamically controls the air supply to the aeration tank in line with the fluctuating loads in the influent. It regulates the optimum amount of air based on the respective oxygen, ammonium and nitrate concentrations as well as the amount of wastewater flow. This way, you ensure reliable compliance with the limit values for total nitrogen and ammonium while saving large amounts of energy and on costs for the activated sludge process.

  • With predictive control strategies, you always stay on the safe side even with dynamic inflows and loads and easily comply with defined limits for total nitrogen and ammonium at the outlet of your wastewater treatment plant

  • Optimize your air supply to the biology and thus your energy consumption with the automated system

  • Control up to three independent zones in the biological stage simultaneously

  • Remain flexible for future adjustments and switch from intermittent to continuous aeration at any time

  • You permanently have complete control of the process, as you can adjust all relevant parameters (limit values and control parameters) at any time 

Success stories

  • The Stadtlohn WWTP regulates nitrogen reduction using the Liquiline Control. The Stadtlohn WWTP regulates nitrogen reduction using the Liquiline Control.

    Controlled by Liquiline Control

    Liquiline Control regulates nitrification and denitrification in the Stadtlohn wastewater treatment plant. The control system ensures compliance with limit values and optimized energy usage.

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  • What we offer

    Liquiline Control is a PLC-based automation solution that ensures reliable nitrogen removal from wastewater, stable processes even during peak loads, and cost savings through optimized air supply to the aeration tank. It is designed as a modular,...

  • Hardware & Software

    • Based on a Programmable Logic Controller (PLC) 

    • Available for installation in existing cabinets or as a separate turnkey cabinet  

    • Easy integration into existing distributed control systems (DCS) via digital fieldbus communication 

    • Also available as...

  • Services

    • Consulting 

    • Project management 

    • Factory acceptance test (FAT) 

    • Site acceptance test (SAT) 

    • Certification (CE)      

    • Commissioning by experienced Endress+Hauser service engineers 

    • On-site trainings 

    • Remote maintenance 

    • Optimization during operation 

    • ...

Offering highlights

  • ISEmax CAS40D - Sensor with Memosens technology using the ion-selective measuring principle ISEmax CAS40D - Sensor with Memosens technology using the ion-selective measuring principle
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    Digital ammonium and nitrate sensor ISEmax CAS40D

    Ion-selective Memosens sensor for the wastewater industry

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  • Oxymax COS61D is an optical dissolved oxygen sensor with long-term stable fluorescence layer. Oxymax COS61D is an optical dissolved oxygen sensor with long-term stable fluorescence layer.
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    Digital oxygen sensor
    Oxymax COS61D

    Memosens optical oxygen sensor for water, wastewater and utilities

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  • COS51D is a reliable, digital oxygen sensor offering the highest level of measurement accuracy. COS51D is a reliable, digital oxygen sensor offering the highest level of measurement accuracy.
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    Digital oxygen sensor
    Oxymax COS51D

    Memosens amperometric oxygen sensor for water, wastewater and utilities

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  • Liquiline System CA80AM - High-precision process analyzer for ammonium measurement Liquiline System CA80AM - High-precision process analyzer for ammonium measurement
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    Ammonium analyzer
    Liquiline System CA80AM

    Colorimetric system for online monitoring of water and wastewater treatment

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  • Viomax CAS51D - the smart nitrate & SAC sensor with fast response time and chemical-free handling. Viomax CAS51D - the smart nitrate & SAC sensor with fast response time and chemical-free handling.
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    Digital nitrate or SAC sensor Viomax CAS51D

    Memosens sensor for optical measurement of nitrate, SAC, CODeq, TOCeq, BODeq or DOCeq

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  • Liquiline CM448 is a digital transmitter for pH, ORP, conductivity, oxygen, turbidity and more Liquiline CM448 is a digital transmitter for pH, ORP, conductivity, oxygen, turbidity and more
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    8-channel transmitter
    Liquiline CM448

    Flexible multiparameter field device for all industries

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  • Picture of thermal mass flowmeter Proline t-mass 65I insertion for industrial gases & compressed air Picture of thermal mass flowmeter Proline t-mass 65I insertion for industrial gases & compressed air

    t-mass 65I

    High-performing flowmeter with intelligent and dynamic adaptation to changing process conditions. Measurement of gases and gas mixtures in circular piping or rectangular ducts.

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  • Instrumentation maintenance services Instrumentation maintenance services

    Maintenance services

    Unlock operational efficiencies, increase field measurement reliability, and mitigate quality, safety and environmental risks with Endress+Hauser maintenance services.

  • device commissioning device commissioning

    Device commissioning services

    Ensure measuring point confidence and high process performance from the start with Endress+Hauser device commissioning services

Downloads

    • Company magazine
    Brochure on Liquiline Control aeration control

    Efficient aeration control

    • Company magazine

    Innovation brochure on Liquiline Control aeration control

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    Making sure your wastewater treatment plant runs and runs

    Take a look at the Endress+Hauser devices specially developed for wastewater. Memosens and Liquiline as well as monitoring solutions, that make your wastewater treatment processes easier.

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    • Company facts
    Technical information on Liquiline Control CDC81 for automated wastewater processes

    TI Liquiline Control: wastewater treatment optimization

    • Company facts

    Technical information on Liquiline Control CDC81 for automated wastewater treatment processes

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