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Join us for our seminar
at Aqua Nor

Innovation in Water: Insight, Water Treatment, and the Aquaculture of the Future

Sterner and OxyGuard invite you to a joint mini-seminar during Aqua Nor, where we will focus on solutions that contribute to more efficient and sustainable operation of land-based aquaculture facilities.

Through four short and insightful presentations, we will address topics such as monitoring and digitalization, ozone water treatment, sludge and biogas management, and key success factors for water treatment in RAS.

Speakers

Paw Petersen portrettfoto

Paw Petersen

CEO at OxyGuard International A/S

Stian Johnsen

CEO at Sterner AS

Katie Spiliotopoulou portrettfoto

Katie Spiliotopoulou

Project Manager/Senior Scientist at OxyGuard International A/S

Alf Gunnar Øvrebø portrettfoto

Alf Gunnar Øverbø

Key Account Manager Aquaculture at Sterner AS

Program

Date: 19.08.2025
Time: 15:00
Location: Meeting room Sagosen, Trondheim Spektrum

15:00

Welcome and simple food service

15:10

Monitoring & Digitalization

The presentation demonstrates how modern sensor technology and digital data collection provide improved insight, control, and decision-making for efficient and sustainable operation of aquaculture facilities.

Paw Petersen

15:30

Land-based aquaculture – the road ahead

What challenges arise in the collaboration between fish farmers and process engineers regarding the future design and operation of land-based facilities?

Stian Johnsen

15:50

Introduction to ozonation and its benefits for Recirculating Aquaculture Systems

The presentation provides an introduction to ozone chemistry and the practical use of ozone in RAS facilities, offering insights into benefits, challenges, and real-world project experience.

Katie Spiliotopoulou

16:10

What is sludge? – From waste to value in aquaculture

Gain new perspectives on how smarter sludge understanding can help secure a more sustainable future.

Alf Gunnar Øverbø

16:30

Finished

Seminar registration

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Sterner AS

Vat. number. 957 471 455

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Paw Petersen portrettfoto

Paw Petersen

CEO at OxyGuard International A/S

Paw Petersen, an electronic engineer specializing in measurement and control technology, has been the Owner and Director of OxyGuard International since 2000.
Under Paw’s leadership, OxyGuard has become a global leader in water quality measuring, monitoring, and control equipment for the aquaculture industry.

His innovative approach and expertise have driven the company’s success and growth in providing intelligent solutions for sustainable aquaculture.

Stian Johnsen

Stian Johnsen

CEO at Sterner AS

Stian Johnsen is the CEO at Sterner, a company focused on innovative technology for the aquaculture industry and landbased fish farming. With an MSc. In Process technology and a BSc in Machine/Energy, Stian has over 17 years of experience in various industries, including international Oil and Gas, waste-to-energy, and aquaculture.

During his 12 years in the Oil and Gas industry, Stian specialized in separation and water treatment systems for produced water discharge. He then spent 2 years in waste-to-energy, recycling valuables in hazardous waste, and 4 years in international aquaculture business, focusing on sustainable land-based fish farming with RAS-technology.

Stian is a firm believer in the potential of future landbased fish farming with innovative technology. His motto “There is no need in doing things right, if you don’t do the right things” reflect his commitment to finding sustainable solutions for the environmental challenges we face.

Katie Spiliotopoulou portrettfoto

Katie Spiliotopoulou

Project Manager/Senior Scientist at OxyGuard International A/S

Aikaterini (Katie) Spiliotopoulou is a Greek native environmental engineer who attended the University of the Aegean in Greece (BSc) and the Technical University of Denmark (MSc).

She has a strong scientific background in environmental technologies and analytical chemistry based on multidisciplinary academic studies with special interest in aquaculture, swimming pools, and wastewater treatment with UV and ozonation treatment.

During her MSc she has worked with the photolysis and secondary formation of disinfection by-products by UV treatment of swimming pool water, and she has participated in projects aiming to remove pharmaceutical compounds and other micropollutants from wastewater using ozone. She completed a PhD at the Technical University of Denmark (DTU) studying the effect of ozone on water quality in pilot RAS systems using UV absorbance and Fluorescence spectroscopy to control the ozone dose in water.

In 2014 she joined Water ApS, a part of OxyGuard Group, where she has worked with designing ozone and UV systems mainly for the aquaculture industry. Since 2020 she has belonged to the project management group of OxyGuard Int. A/S drafting project proposals aiming to solve various issues in the aquaculture industry (e.g. geosmin) and following up the funded projects through all stages upon completion, making her an experienced Project Manager.

Alf Gunnar Øvrebø portrettfoto

Alf Gunnar Øverbø

Key Account Manager Aquaculture at Sterner AS

Alf Gunnar Øverbø works as Key Account Manager Aquaculture at Sterner AS, focusing primarily on water treatment and sludge management in land-based aquaculture. With over 10 years of experience in the aquaculture industry, he has built solid expertise through both hands-on fieldwork and as a technical solutions advisor in sludge treatment.

Over the years, Alf Gunnar has been involved in a wide range of projects and is known for his ability to combine practical insight with system-level thinking. He is passionate about communicating technical topics in a clear and engaging way – especially when it comes to sludge, which he believes is one of the most underrated keys to securing sustainable aquaculture for generations to come.

In his presentation at Aqua Nor, he will address a fundamental question: What is sludge, really? What is it made of, how much of it is there, and how can we better understand it to manage it more intelligently? The talk will offer professional reflections, real-world examples – and a little push to reframe sludge from “waste” to “resource.”