Thickening in wastewater treatment

Cost efficient solutions for thickening of sludge in fish farming

We offer proven technology and solutions for sludge thickening

The first separation step is known as thickening of the wastewater.

Dry matter (DM) content increases from 0.01 - 0.15% up to 2-10 %, typically around 5 % DM.
Achieves significantly cleaner water with reduced COD and BOD levels, ready for further treatment or discharge.

Why choose our thickening solutions?

Proven technology for thickening of wastewater in aquaculture
Handles large variability in flow and capacity.
Automated system eases operation
Compact footprint and Easy maintenance access

A thickening solution for every need - Belt thickeners or Dissolved Air Flotation (DAF)

In collaboration with trusted manufacturers and suppliers, we offer various types of design and solutions for thickening.

Our recommended equipment selection is based on a careful evaluation of process conditions, available space and utilities and economic and environmental requirements.

Part of Skira - our commitment to sustainability

Thickening solutions from Fjell is part of our Skira WWTP.

Derived from Old Norse, Skira means “to purify” or “to make clear”—a perfect reflection of our mission. Skira represents clarity, responsibility, and innovation. Purity isn’t just a promise; it’s our standard.

Our expertise, technology and solutions are ready to support you. Learn more about our complete Fjell Skira Wastewater treatment

Download our Brochure on wastewater treatment in aquaculture

Your partner for making value from rest raw material

Discover the future in a circular economy with Fjell Technology Group. Our offerings include sustainable technology and solutions to create value from waste, and to safeguard the environment.

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Separation by belt thickener and use of polymers for strong flocs formation

Perfect strong flocs created by Floccera SalPro polymer for aquaculture wastewater at salmon smolt farm in Norway. The flocs are separated out in the belt thickener. We offer a full spectrum of products and process systems for wastewater and sludge treatment, contact us today.

Explore our customer stories in aquaculture wastewater treatment

Advanced sludge treatment at Sævareid Fishfarm

Fjell Technology Group is proud to have supported one of Norway’s leading smolt producers with advanced sludge drying, automated storage system for dried sludge, and energy-saving heat recovery solutions. Sævareid Smolt facility produces 28 million smolt annually.

Wastewater treatment plant in aquaculture

World's first hub for sludge treatment in aquaculture

Explore the first hub in the world to collect and handle sludge from various fish farm plants in the region. The plant is a fully automated sludge drying plant, delivered to Salten Marine Resources in Glomfjord Industry park in 2021.

Next generation Wastewater treatment upgrade at Salten Smolt

Salten Smolt produces and delivers premium-quality smolt to customers across the region. Salten Smolt faced operational challenges with their wastewater treatment system. Through close collaboration and iterative upgrades, Fjell Technology Group and Salten Smolt has built a solution that evolves with the customer’s needs. Design and delivery of an innovative polymer performance system has resulted in better particle aggregation and cleaner water discharge.

Efficient and proven solution by Belt Thickeners

Our belt thickeners gently separates water from solids using gravity and a moving filter belt, producing a thicker sludge suitable for further dewatering or disposal. Our belt thickeners are recognized for their high operational stability, long-lasting durability, high performance and wide range of capacities to accommodate variable needs.

Compact footprint and easy integration
Gentle handling of biological sludge
15 different models and Treatment capacity for one unit spans from 1 m³/h to 220 m³/h.
Several units can operate in parallel to accommoate larger flows.

Contact our experts for more information

Separation of suspended solids by DAF Unit

A Dissolved Air Flotation (DAF) unit is a continuous and compact purification system that removes suspended solids, oils, and other contaminants from wastewater. It works by releasing microbubbles that attach to particles, lifting them to the surface for removal.

DAF Key benefits

Handles higher hydraulic loading than other technical solutions
Handles higher solids loading than other technical solutions
High separation efficiency
Higher dry matter (DM) content from this thickening process - ideal for dewatering by decanter in next stage.

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Explore our offerings and the process steps of Fjell Skira Wastewater treatment

Skira Wastewater Treatment solutions

Derived from Old Norse, Skira means “to purify” or “to make clear”—a perfect reflection of our mission. Skira is our complete solution for the treatment of wastewater from fish processing plants, land-based fish farms and fish farm facilities in the sea. We design and deliver complete and fully automated plants for wastewater treatment in aquaculture.

Polymers and coagulants for wastewater treatment

We offer an effective product line that widthstand high salinity for advanced and strong separation in wastewater treatment. Floccera are environmentally friendly water dispersion flocculants (pollymers) and coagulants for wastewater treatment thickening and dewatering

Dewatering

Dewatering brings the thickened sludge to 20-25% DM, being an ideal content for further sludge drying. Our Dewatering solution is designed to meet your capacity needs and typically involves a decanter centrifuge, being an energy-efficient and durable dewatering method. In collaboration with trusted partners, we offer various and other types of designs and solutions for dewatering.

Polymer and Coagulant Performance System

The Fjell Coagulant and Polymer Performance system is a fully automated system designed to give the optimal choice of polymer and coagulant, storage of selected product, maturation and correct dosing of coagulant and polymer, and optimal reaction time of selected polymer and coagulant. The result is a clearer, cleaner effluent.

Sludge drying

We offer a range of dryers proven for fish sludge applications. For small to medium sized fish farms, our TMD (Thermo Mechanical Dryer) sanitizes and fully dries the sludge by friction heat. For larger capacities, our TD (Turbo Disc) dryer is the most energy efficient option. In Fjell, we have 45 years of experience in full/part drying and utilization of residual raw materials.

Release Ready

Clean water assurance of water effluent and reject water from treatment process (and RAS overflow water) by means of biological treatment to achieve even higher BOD and COD removal before discharge. This final cleaning step is designed to meet stringent environmental regulations and can address remaining solids, nitrogen, phosphorus, total organic carbon (TOC), and other substances as required.

Explore how we can support you in compliant and cost-efficient treatment of your wastewater and sludge

Contact our experts