Reduced Costs in Wastewater Treatment Process

Hätälä fish refinery used to channel all their wastewater directly to the municipal wastewater treatment plant. Not only they faced high costs, but they also experienced repeated blockages in the system caused by grease and solids in the sewers. Roxia and Owatec suggested a sludge and wastewater treatment process with remote monitoring, separation of solids, repurposing solids and fatty sludge. The result of the process improvement is reduced wastewater cost which amounts to 25 % less on the annual level.

Project overview

  • Annual savings -25 % from wastewater costs
  • Grease and solids no longer block the sewers
  • Sludge is used for biogas production

Customer: Hätälä, Finland’s leading fish producer, fish processing wastewater treatment

Challenge: High wastewater costs (€/m³)

Solution: Water and sludge treatment with remote monitoring, separation of solids, repurposing solids and fatty sludge

Results: Less waste, reduced load to municipal WWTP, 25 % savings in wastewater costs, preventive maintenance

Overall view of the wastewater treatment process before the water reaches the sewers. Hätälä - Roxia.

Solids No Longer Block Sewers in Wastewater Treatment Process

Hätälä fish refinery used to channel all their wastewater directly to the municipal wastewater treatment plant. Not only they faced high costs, but they also experienced repeated blockages in the system caused by grease and solids in the sewers.

After careful examination, Roxia and Owatec experts suggested establishing a pre-treatment unit that would separate solids and grease from the wastewater. Per year, Hätälä handles 110 000–130 000 m³ of wastewater and 500–1000 tons of sludge. With these amounts, already separating the solid particles could significantly improve or eliminate the issues.

We created a customised wastewater treatment process. The entire operation is automated and remotely monitored with Roxia Malibu (IIoT platform). This allows Hätälä to save time and focus on their core business. The automation system also monitors pollutant limit values. With only a few clicks, the customer can get instant reports about quality values and treated volume.

Since the installation of the wastewater unit, Hätälä gets two in one: a 25 % reduction of wastewater costs and lower level of impurities. Because solids and grease are now removed from the wastewater, the sewers do not get blocked. What is more, solids and fat sludge are used as biogas feedstock. Recycling such valuable components contributes to better use of resources and reducing the environmental impact.

How did we improve performance?

“The wastewater treatment process equipment by Owatec and Roxia Malibu automation have been innovative and the process is running smoothly. We have gained both savings and lower impurities levels.”

— RIKU ISO-HÄTÄLÄ, CEO, HÄTÄLÄ OY
wastewater-treatment-automation-iiot-platform-view-roxia-2021

Full Automation Through IIoT Platform

The entire wastewater treatment process is fully automated: remotely monitored and controlled with Roxia Malibu, the IIoT platform. Hätälä staff can access the view from any device with an internet connection. Below is the overall view of the wastewater treatment process before the water reaches the sewers.


  1. Inlet unit: transfer pumps and screening
  2. Dewatering unit
  3. Chemical dosing unit
  4. Flotation unit: solids and fat separation
  5. Sludge tank for solids separated in flotation
  6. Discharge to sewer

Our customer: Hätälä Oy

Hätälä is Finland’s leading fish producer located in Oulu, Northern Finland. They employ over 200 fish-processing professionals and have revenue of over 100 M€. Hätälä prides itself in responsibly farmed or caught fish in their products.

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BrochureFish Processing Wastewater Treatment

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