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Morten Kildahl Sorensen


1E, Vesterbrogade, 1620, Copenhagen, Denmark

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Case Study: How to secure the optimal energy efficiency in Waste Water Treatment Plants (WWTPs) and Water Treatment Plants (WTPs)?

  • Subsectors:
  • Utilities
  • Electricity
  • Gas, Water & Multi-utilities
  • Conventional Electricity
  • Alternative Electricity
  • Multi-utilities
  • Water

One stop shop based on cooperation, know-how, technology, feasibility, financing and construction.

 "Our long-term goal is to go from being a net energy consumer to a net energy producer, and this we believe can only be done through a close cooperation with the Danish group and through a holistic approach.We need strong focus on reducing energy consumption while maximizing energy production at the wastewater treatment facility, without compromising the effluent quality". Mr. Piotr Kowalski, Wastewater treatment plant manager, Ilawskie Wodociagi

A group of Danish companies headed by CLEAN have joined forces and entered into a partnership that offers clients a simple but efficient concept - a “one stop shop”. This includes all phases of the project from the conceptual phase and feasibility study to the design of technical solutions, but also financial solutions and finally construction.

Become more energy efficient with improved monitoring and control

Municipal WWTPs are dynamic systems that experiences large external disturbances. These disturbances are often related to the inhomogeneous nature of the influent wastewater, e.g. variations in influent wastewater temperature, flow rate, composition and pollutant concentration.

By introducing a Baseline model which online monitors the actual energy consuming parts and processes in a WWTP you receive real-time information about actual energy balance of the plant. The model defines the energy consumption in WWTP, based on the actual hydraulic-, organic- and nutrient load. This Baseline model can thereby provide a picture of which plant processes that are the most inefficient and energy consuming.The aim of the tool is to facilitate the choice of what improvements to implement to eventually render the WWTP net energy neutral or even net positive, through mapping of inefficient processes, replacing equipment and making continuous improvements. However, the Baseline model is not limited to WWTPs and can also be adopted for pumping stations or water treatment plants.

The Baseline model is after implementation followed by implementation of an array of energy efficient software solutions supplied by the Danish group after consultancy with the plant operators. These solutions are used to control the most energy consuming processes such as pumping and aeration in a much more energy efficient method than what is typically used. Improved unit control and advanced online control of treatment processes through the use of advanced sensors are able to greatly reduce the energy consumption while improving the plant’s overall treatment efficiency and treatment capacity.

 “As an example, it can beestimated that the electric energy consumption of a wel-functioning WWTP can be reduced by 10-30 % and additional savings on chemicals, if such are used in the treatment of the wastewater," EnviDan/PICCA,

 The Baseline Models return on investment

Since late 2014 the Baseline model has been running at Middelfart Wastewater (MW). During the period MW has been able to monitor the energy consumption throughout the various plant processes, and MW has been able to identify a list of possible places in the wastewater treatment chain where energy efficient equipment would be beneficial to implement. This will eventually led to reductions in the energy consumption thanks to the Baseline Model.

“Our vision is to transform WWTP from an energy consuming plant to an energy neutral plant – and eventually an energy producing plant. We expect min. savings 20-30% yearly and in the end we believe to become an energy producer. But the foundation has to be in place, before starting such a transition” – Mr. Allan Bruus, CEO Middelfart Spildevand.

 Showcasing outside Denmark

The model and the way of incorporating it has become interesting not only for Danish WWTPs. The group consisting of EnviDan, Picca, Middelfart wastewater, CLEAN and in close cooperation with the Polish Gdańsk Water Foundation and later during realization of project with BOZ, the Danish group approached the front- runners of WWTPs in Poland and the solution and the “one stop shop” approach has become of interest. Two Polishs WWTPs, Ilawskie wodociagi and Miejskie Przedsiebiorstwo wodociagow I kanalizacji w Leborku has in close cooperation with the group looked into their processes to become more energy efficient. Together the group has identified the challenges and are now working on a plan to modernize the plant.

“We need to know the energy efficiency of a given load to calculate the actual savings. To see these online values ​​also mean that we can take action immediately when we see a loss of energy efficiency in a given location at the facility.” - Mr. Mateusz Labuda, automation specialist, Miejskie Przedsiębiorstwo Wodociągów I Kanalizacji w Lęborku.

For further information please contact:  Morten Kildahl Sorensen, Chief Project Manager, Mail: mks@cleancluster.dk 


Want to learn more?

Middelfart wastewater

Middelfart Wastewater have had many years of experience in operating sewer systems and wastewater treatment plants and with the use of the baseline model for energy optimization of the WWTP.

Mr. Claes Barlebo, Technical director, Phone : +45 63 44 44 44, mail: cb@middelfartspildevand.dk, Web: www.middelfartspildevand.dk

Picca Automation

Picca is an expert in energy efficiency software solutions, scada systems for water and waste water.

Mr. Peder L. Steffensen, Director, Phone.: +45 87 20 14 00, Mail: pls@picca.dk, Web: www.picca.dk



Danish engineering and consultant company.

Main business areas: Water supply and resource, sewer systems technology, wastewater treatment, climate adaptation and biogas & energy.

Mr. Søren Bruun Hansen, Director, Phone.: +45 27153761, Mail: sbh@EnviDan.dk, Web: www.EnviDan.dk


Gdańsk Water Foundation - training center for water professionals

Mr. Zbigniew Sobocinski, consulting company Environmental Engineering Office “BOZ”

Phone:+48 603 923 293, Mail:  zbyszek@epoczta.pl


Ilawskie Wodociagi

Mr. Piotr Kowalski, Wastewater treatment plant manager

mail: oczyszczalnia1@wp.pl

Miejskie Przedsiębiorstwo Wodociągów I Kanalizacji w Lęborku

Mr. Mateusz Labuda – automation specialist,

Phone +48 600 915 343, mail:mateusz.labuda@wodociagi.lebork.pl


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How to secure the optimal energy efficiency in Waste Water Treatment Plants (WWTPs) and Water Treatment Plants (WTPs)?

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