Salsnes Filter System to be Installed at Ultramodern Climate and Environmental Park

Wastewater treatment plants are most commonly constructed and operated with the public unaware of the important work being done at these facilities. This status quo is likely to change in Hillerød, Denmark, where the Solrødgård Climate and Environmental Park is currently being constructed.

Public Space Merged with Public Utilities

The 51-hectare Park, commissioned by the Danish utility consortium Hillerød Forsyning is using special architecture and design to merge a public recreational space with a wastewater treatment plant, as well as a recycling station and energy production plants.

This ultramodern park will be an attraction for local residents, and an educational tool for schools with its on-site Climate and Environmental Centre. The grounds will also have a large wetland area that will collect rainwater, as well as attract a rich bird population among other wildlife and plants.


Solrødgård Wastewater Treatment Plant

The Wastewater Treatment Plant is being constructed so that visitors can view the treatment technologies at work. Six Salsnes Filters are being installed at the facility, to treat wastewater for Hillerød Municipality. 


SFK600 model

SFK600 Salsnes Filter

Primary Solids Separation and Sludge Thickening and Dewatering

The Salsnes Filter system will perform primary treatment, removing approximately 50% TSS from the wastewater, as well as thickening and dewatering sludge to approximately 6% total solids. This can be compared to conventional primary treatment which typically produces sludge with about 2% total solids. Having drier sludge means that no additional thickening processes are required before sludge can be further processed for use in biogas production.


Maximizing Biogas Production

Due to the speed of the filtration process, the fresh sludge taken from the filters ensures biogas production (and energy production) will be maximized. The design of the Salsnes Filter system  allows control over the amount of organic matter that is separated in the primary stage, and how much is left in the wastewater for secondary biological treatment.

Further Reading:

Cellvation Technology Wins Aquatech Innovation Award

At Aquatech Amsterdam, we had the pleasure of sharing a Stand with our partner from The Netherlands, CirTec, and the show was a great success! 

Our stand was packed with visitors coming to see Cellvation, CirTec’s cellulose recovery technology that won this year’s Innovation Award. They won in the Waste water treatment category AND won the Overall prize ahead of the other 4 category winners.

Ivar Solvi & Stefano Salvatore of Salsnes Filter and Harry Tuinier of CirTec

Sewage Sludge Becomes a Valuable Resource

Cellvation technology uses sewage sludge, which has commonly been thought of as waste (and a problem to dispose of) and has turned it into a valuable resource.

The technology recovers cellulose fibers (toilet paper) from wastewater which is further processed into pellets that can be used in the production of commercial products, such as asphalt, bioplastics and biocomposites.


The Salsnes Filter System’s Critical Role

The Salsnes Filter system plays a critical role in the technology, separating the cellulose fibers from incoming wastewater.










Aquatech Amsterdam

Aquatech Amsterdam took place at the RAI Exhibition and Convention Centre from October 31 – November 3, 2017. The event hosted over 21,000 attendees and 900 exhibitors from 139 countries.

Further Reading


Salsnes Filter and Novus Exhibit at Ecomondo, Rimini, Italy

Trojan Technologies is back to show at Ecomondo ( with its business dedicated to primary wastewater treatment, Salsnes Filter. We are exhibiting in collaboration with Novus (, long-standing Trojan Partner in Italy since 2006.

Visit us at Booth #186, Pavilion D1!

We look forward to showing you our disruptive primary treatment technology, already installed in Italy, Europe and worldwide. The Salsnes Filter system can help you to save 90% of the primary treatment footprint at your wastewater treatment plant.

Rimini, Itlay
Nov 7 – 10, 2017

Trojan Technologies ritorna ad esporre ad Ecomondo ( ) e lo fa con la sua divisione Salsnes Filter dedicata al mondo del trattamento reflui primari. Saremo presenti in collaborazione con Novus ( ), partner storico di Trojan in Italia sin dal 2006.

Veniteci a trovare allo Stand 186, Padiglione D1!

Vi aspettiamo per parlarvi della nostra soluzione disruptive, già applicata in Italia ed in Europa, che vi permetterà di risparmiare il 90% di spazio della sezione primaria del vostro depuratore.

Rimini, Italia
7-10 novembre 2017


SludgeTech 2017

IWA’s Specialist Conference on Sludge Management –  SludgeTech 2017 – was held on July 9–13, 2017 at Imperial College London. It was a great success, with many productive conversations happening in the exhibit area, and a number of very interesting technical papers presented.

Our Ashish Sahu (Product and Technology Applications Manager) presented a technical paper entitled “Enhanced Filtration with Rotating Belt Filter for Higher Methane Potential from Primary Wastewater Sludge”.

Ashish Sahu presenting at IWA's SludgeTech 2017

This scientific study shows that a higher methane potential can be obtained from the sludge of rotating belt filters (RBFs) with the addition of a small dosage of polymer (1.0 mg/L).  The cost of the polymer is minimal for the added value a utility can receive which includes higher bioenergy on cogeneration and a lower level of particulates entering downstream processes.

If you missed SludgeTech and would like a copy of Ashish’s presentation, contact us.

The Salsnes Filter team at their SludgeTech booth

The Salsnes Filter Team at SludgeTech 2017: from left, Roger Webb, Stefano Salvatore, Jon Leech.

Further Reading:

Full List of Salsnes Filter Publications
(including Scientific Publications, Conference Proceedings and White Papers)


SMART-Plant Pilot Project: Recovering Cellulose from Salsnes Filter Sludge

June 29th, 2017 marked the inauguration of a first-of-its-kind cellulose harvesting system installed at the Geestmerambacht Wastewater Treatment Plant (WWTP) in the Netherlands.

This pilot system is considered to be the world’s first full-scale installation that uses sewage to produce a significant amount of high-grade cellulose that can be reused in commercial products.

Sludge as a Valuable Asset

Sewage sludge has commonly been thought of as waste, and a problem to dispose of. The Geestmerambacht WWTP pilot project intends to prove that sludge can be a valuable asset in which resources can be recovered and reused.

Salsnes Filter system installed t the Geestmerambacht Wastewater Treatment Plant (WWTP).

Salsnes Filter system installed at the Geestmerambacht Wastewater Treatment Plant (WWTP)

It is one of six pilot systems hosted by SMART-Plant, an initiative which finds innovative treatment technologies that can demonstrate environmental sustainability and prove the feasibility of circular wastewater management (an alternative to the traditional model where waste has no beneficial reuse).

Marketable Celluose – Cleaned, Dried & Disinfected

Harvested cellulose

At the WWTP, a Salsnes Filter system is installed (in collaboration with our partner CirTec) for primary treatment, separating cellulose fibers from toilet paper in the wastewater to produce a highly-concentrated sludge.

The sludge is then sent for post-processing inside the treatment plant.

The end result: marketable cellulose that has been cleaned, dried and disinfected.

Cellulose harvesting is anticipated to have added benefits to the WWTP’s downstream biological process. Results are expected to show energy savings and a reduced amount of secondary sludge produced.

Further Information

  • Read more about SMART-Plant and our involvement in this exciting project

Media Coverage

BBC Word News Segment


RTL Z Segment
Watch this video about the project from Dutch business and financial news channel, RTL Z.


Demonstration System for Brewery Wastewater Treatment

Written by and originally posted by MAK Water

Brewery Waste Water Treatment

Not satisfied with the existing waste water process, and faced with the possibility of trade waste license breaches, a trial for a Salsnes Fine Screen Filter was run.

A large food and beverage manufacturer approached MAK Water as they had increased production on multiple sites and their existing Waste Water Treatment Plants (WWTPs) were not keeping up with the new demand. They also wanted to eliminate the production of sludge as a by-product from the treatment process.

Not satisfied with existing waste water process, and faced with the possibility of future trade waste license breaches, the manufacturer engaged MAK Water to work collaboratively with their engineering consultant and run a pilot trial for a Salsnes Fine Screen Filter.

The trial ran for four weeks and was deemed a success, with the following results:

  • Sludge dewatered to approximately 20% dry matter, eliminating the sludge from the current process and enabling the waste to be disposed of by a solids waste contractor
  • Approximately 50% Total Suspended Solids (TSS) removal
  • No additional chemicals were required to dewater the sludge in the filter.

The food and beverage manufacturer went on to engage MAK Water to complete turnkey upgrades of their waste water treatment plants in both Victoria and NSW.

The scope included:

  • Salsnes fine screen filters for solids reduction
  • A pH correction system
  • On site installation works
  • Commissioning and operator training

Due for completion in November 2016, the upgrades are expected to reduce the client’s waste disposal costs and improve process control to eliminate any potential environmental license breaches.

Original Article by MAK Water

Salsnes Filter Receives “Green Light” at the British Water Innovation Exchange

On June 7th, we were invited to Brighton, UK, along with 20 other companies, to present our technology at the British Water Innovation Exchange. This marks the 31st event of this kind hosted by the British Water association and their fifth time collaborating with Southern Water, a utility that provides water and wastewater treatment services in the South East of England.

Stefano Salvatore (Business Development Manager) and Roger Webb (Sales Manager, UK), attended the event and received a green light for their presentation on the Salsnes Filter system.

The event is held in a “Dragons Den” style format, designed to provide instant feedback as to whether the technology being presented is of interest to Southern Water in the immediate future. Technologies are scored using a traffic light-based system. This year, 50% of the technologies presented received a green light to proceed with their full product offering into Southern Water. 

We were thrilled to receive a green light for the Salsnes Filter system, our rotating belt filter technology for primary wastewater treatment. Our presentation received very positive feedback and many additional questions from the panel. We discussed the modular design, small footprint, automation and proven performance of the Salsnes Filter system, and how we can help meet the needs of wastewater treatment plants and also contribute to a circular economy.

More about the British Water Innovation Exchange with Southern Water


The Innovation Exchange was held on June 7th by British Water in collaboration with Southern Water.

SMART-Plant Wastewater Pilot Projects: Salsnes Filter at the Forefront of Resource Recovery

In the wastewater industry, new product innovation is at an all-time high. Companies are developing technologies that can greatly improve the efficiencies and environmental impact of municipal wastewater treatment. The SMART-Plant project was created to help find these innovative technologies and demonstrate their ability to recover resources, reduce energy demand and minimize carbon footprint.

The project was initiated by the Italian water utility Alto Trevigiano Servizi in cooperation with the University of Verona and the Veneto regional government. It has grown into a collaboration of 25 partners in ten countries including other universities, research companies, engineering firms, water utilities and manufacturers. Funding for the project comes from the European Union’s Horizon 2020 research and innovation programme under grant agreement No 690323.

Six Wastewater Treatment Plants, located in The Netherlands, UK, Spain, Italy, Greece and Israel, are hosting nine pilot systems. These systems will operate for two years to monitor the performance of treatment technologies installed to recover biopolymers, cellulose and phosphorus from the wastewater to be processed into final commercial products.

One of these pilot projects (called SMARTech 1) is taking place in Geestmerambacht, The Netherlands. Our Salsnes Filter system is currently being installed there to replace conventional primary sedimentation and perform primary cellulose harvesting. The system will separate fine cellulose fibers from toilet paper in the wastewater to produce a highly-concentrated sludge. For this pilot study, the sludge is then sent for post-processing inside the treatment plant. A compact sequence of equipment from the paper and food industries will treat the sludge to produce clean and marketable cellulose.

Some of the clean cellulose will be sent for further treatment at another SMART-Plant pilot system (called Downstream SMARTechA) to produce bio-composites.

Read more about SMART-Plant  


Recovering Cellulose from Wastewater for Reuse

Wastewater treatment plants have traditionally been a cost-center for municipalities as treated effluent is often discharged back into the environment with little to no beneficial reuse. This is starting to change as wastewater professionals are finding innovative ways to produce a resource to use or sell. By doing this, operating costs can be cut and ideally Plants can become profit-centers.

SFK:600 model

SFK:600 model

For the Netherlands, resource recovery is a main priority and the Beemster Wastewater Treatment Plant (WWTP), near Amsterdam, is an example of this. The WWTP uses eight SFK600 Salsnes Filters to separate fine cellulose fibers from toilet paper in the wastewater. Fibers are collected and further processed into sugar and in a next stage to lactic acid as a base material for bioplastic (PLA).

The WWTP also discovered an added benefit of removing cellulose from the wastewater. The organic loading on their downstream biological process has been reduced, which has lowered the Plant’s aeration requirements and energy consumption.

The Salsnes Filter installation at Beemster WWTP was built in close collaboration with our partner in the Netherlands; BWA B.V.

In this video from the national Netherlands TV station KNN Group B.V., Bob de Boer of Waterboard Hollands Noorderkwartier explains the process of the Salsnes Filter system and its use at the Beemster WWTP. The video also discusses how cellulose from screenings can be reused in other applications. It has recently been used as an ingredient in the production of asphalt to create a bike path in the area.