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Nijhuis Saur Industries

Project's context and challenges

The Stora Enso mill in Ostrołęka is a combined pulp, paper, containerboard and corrugated box mill. The site was operating a high-rate anaerobic reactor that was underperforming, resulting in difficulties in the aerobic treatment stage and leading to extra costs due to the purchase of additional granular sludge. After a successful consultancy by Econvert, the existing high-rate anaerobic reactor was optimized. Shortly thereafter, the first Econvert-IR® reactor was built. Due to its COD removal efficiency and sludge growth, the Econvert-IR® outperformed the original reactor. As a result, Stora Enso decided to retrofit the existing installation with Econvert-IR® internals.

Key figures

30 ton COD/day
Econvert®08024
60 ton COD/day
Econvert-IR®11522

Customer benefits

Operational reliability

High COD removal efficiency

Growth of anaerobic sludge

Small footprint

Able to treat high calcium concentrations in wastewater

Flexibility of Econvert with unique retrofit of existing reactor

Solution

Econvert supplied an Econvert-IR® reactor designed to treat 30 ton COD/d. Once the Econvert-IR® reactor demonstrated superior COD removal efficiency and sludge growth compared to the existing anaerobic reactor, the decision was made to retrofit the original unit with Econvert-IR® internals. After the upgrade, the reactor was able to handle an additional load of 60 ton COD/d.

Scope of supply

  • Design and engineering of Econvert-IR®
  • Retrofit of existing anaerobic reactor with Econvert-IR® internals
  • Supply of all equipment, internals and tanks
  • Installation, commissioning & project management
  • Start-up and training operators
  • Operational support (Services)

Applied solutions

  • Econvert-IR®08024
  • Econvert-IR®11522
  • Biogasbuffer

Other solutions

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Anaerobic – Econvert-UASB

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Anaerobic – Econvert-DGF

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Econvert-Dsulph biogas desulfurization
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Anaerobic – Econvert-Dsulph

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The Econvert-Dsulph® is a proven, high-efficiency biogas desulfurization solution that combines the chemical absorption of hydrogen sulfide (H2S) in the scrubber with the biological (...)
Econvert-RTF Biogas Desulfurization
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Anaerobic – Econvert-RTF

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  • Industrial water
The Econvert-RTF® is a regenerative trickling filter which achieves high H2S removal efficiency, consumes no caustic soda and enables aerobic effluent reuse. The technology prevents (...)