Author Archives: Emelie Frejd

Record order for Hydria Water


In early summer, it was decided that the equipment for the world’s most advanced wastewater treatment plant, Sickla treatment plant, would be provided by Borås-based company Hydria Water. Hydria Water is part of the family-owned Borås corporation, Hydria Group. The order’s value amounts to approximately 60 million SEK and marks the single largest order in the company’s history.

– This is both a significant and unique order for an incredibly exciting and extensive project. I am proud that our company the Hydria Group have the opportunity to be part of this, says Tobias Barrstrand, CEO of Hydria Water and Hydria Group.

Sickla wastewater treatment plant is being constructed beneath Hammarbybacken in Skarpnäck, just outside Stockholm. A total of 530,000 cubic meters of solid rock will be excavated from under the hill, which is equivalent to the volume of Avicii Arena. Simultaneously, Henriksdals wastewater treatment plant is being expanded and upgraded to become one of the world’s most advanced treatment plants.

The Sickla facility is part of the Stockholm Future Wastewater project. The expansions are being carried out not only to increase capacity but also to meet stricter requirements, including those related to emissions into the Baltic Sea.

– This project is unique for us because of its size and scope, the largest in Hydria Water’s history. We hope to further strengthen our position in the industry with this project and we look forward to doing so in collaboration with Veidekke/Veitech. Within our segment and the market we operate in, this project is something truly unique, says Johan Fritz Sales Manager at Hydria Water.

Hydria Water’s equipment will be present in most of the process stages in the treatment plant. This encompasses more than 70 unique machine installations with additional components that will be delivered to 20 sedimentation basins, each measuring 70 meters in length, 8 meters in width, and 5 meters in depth.

– Now, we look forward to planning the installations, which will be carried out in collaboration with Hydria Water’s own personnel. Eventually, we also anticipate the equipment deliveries and their installation. It is reassuring to have Hydria Water by our side until the plant’s commissioning, says Kristofer Eklund, Project Manager at Veitec.


A Market-Leading and Reliable Supplier

Hydria Water won the contract due to both trust in Hydria Water as a company and its market-leading position. Hydria Water is already represented in most wastewater treatment plants in Sweden.

– We are the only Swedish manufacturer with our own solution for plastic chain scrapers, where we own all development and manufacturing. It is particularly satisfying to receive this contract considering the tough competition from several foreign competitors. The fact that we are perceived as a reliable supplier contributed to the decision, säger Johan Fritz, Sales Manager at Hydria Water.

The evaluation of the submitted bids was conducted by Veitech in collaboration with Stockholm Water.

– After this process, Hydria Water was considered to have the best technical and commercial proposal for all the scraping systems for the Sickla project, says Kristofer Eklund, Veitech.

With the delivery in place, Hydria Water will have approximately 100 scraper systems in three of Stockholm’s largest wastewater treatment plants.

– What makes this project particularly exciting is, of course, its scale. At the same time, we have been leading the development of equipment for sedimentation basins for many years, and these are machines that we are extremely confident in delivering, says Tobias Barrstrand, CEO of Hydria Water and the Hydria Group

Equipment deliveries are scheduled to begin in the first quarter of 2024, with the project expected to be completed by 2026.


Here’s what Hydria Water will deliver:

Equipment for 20 sedimentation basins, each measuring 70 meters in length, 8 meters in width, and 5 meters in depth.

  • 20 plastic chain scrapers for primary sedimentation basins
  • 20 circular sludge scrapers
  • 20 decanting throughs
  • 50 skimmer boxes
  • 6 plastic chain scrapers for sand traps
  • 24 skimmer boxes for sand traps
  • Assembly of all equipment

Read the full press release in Swedish here.

Renovation of pre-sedimentation at Källby wastewater treatment plant


In October 2022, Hydria Water conducted an inspection of pre-sedimentation sludge scrapers at the Källby wastewater treatment plant located near Lund. The results indicated that it was time to replace both the scrapers and chains, as well as the idler sprockets in all tanks.

The project began at the end of February and was completed less than four months later.

– In total, there were 12 tanks that were divided into pairs, Eric Folebäck, maintenance manager from VA Syd, explains. The project was carried out by shutting down one pair of basins at a time, with a week-long period for flushing and cleaning, followed by a week of dismantling and installation performed by Hydria Water.

The initial plan was to finish the project within 12 weeks, but heavy rainfall and sub-zero temperatures caused challenges, making it difficult to keep the basins emptied and safe to work in.

– Still, I feel that the work proceeded smoothly, and it was easy to stay in touch with Hydria Water’s representatives throughout the process. The replacement parts also came from Hydria, and the fact that there were drawings available from previous work on the tanks proved to be very helpful, Eric says.

An above-ground solution to Iceland to meet more stringent demands on wastewater treatment


The proposal from the European Commission for a new wastewater directive outlines tougher and more demands for wastewater treatment. As a step towards meeting these new directives, Hydria Water was hired to strengthen the treatment done at a wastewater treatment plant in the Icelandic town of Keflavik.  

– Instead of going through a costly refurbishment and building concrete basins, they chose to go with an above-ground concept and install two of our Combi Units. This will not only be more cost-effective but also be much more energy-efficient, says Andreas Riedel, CTO at Hydria Water.  

In this project, Hydria Water has also supported the piping design and tailored a distribution box to reduce the need for additional pumps and valves. Furthermore, they have prepared for a future installation of a third Combi Unit and developed a remote monitoring system.  

– This system enables the customer to optimise remotely via Netbiter and will have direct access to vibration monitor, level gauge and measuring of dry substance content etc, Andreas explains.  

Towards the end of August, the machines are supposed to be up and running, and Hydria Water will be on hand in Keflavik to support the start-up and commissioning.    

Öresundsverket increases their energy efficiency by 67%


Öresundsverket recently hired Hydria Water to refurbish two of their primary sedimentation basins. With the help of our online energy-saving tool, the customer could easily calculate that refurbishment had resulted in 67% improved energy efficiency and had reduced their emissions by 169 kg CO2/year.

“The primary reason for the change was old age, and we needed to ensure the scraper system ran smoothly as the rubber scrapers were more or less worn down. The advantage of these new scrapers is that we are rid of the wheels, and it is easier and less costly to just change the skids”, says Andreas Fäldt, Operations Engineer at Öresundsverket.

Öresundsverket is one of Sweden’s largest wastewater treatment plants, which runs solely on biological phosphorus removal. Approximately 138,000 person equivalents and several larger and smaller factories are connected to the wastewater treatment plant, which receives an average of 55,000m3 water per day.


Photo: NSVA, Timo Julko 

Patented one-of-a-kind solution provides a higher quality cleaning process

After a year of developmental work and two years of field-testing, the Wash Press Gamma WPG is being launched; a one-of-a-kind solution for compressing and dewatering screenings.

“By questioning established techniques and methods currently available on the market, our driving force has been to embrace new perspectives and develop a solution that reduces wear and tear maintenance, as well as almost doubling the amount of dry solids content”, says Andreas Riedel, CTO at Hydria Water.

Some of the competitors’ products involve technology where an impeller is used that fragments the contamination and separates it from rags and screenings. But, according to Andreas, the problem with this method is that the screening is handled too harshly, which in turn leads to a higher ratio of waste particles in the wastewater from the processing phase.

“The existing technology is also risking more wear and tear, and potential breakdown as this involves fast-moving parts in a highly contaminated media.”

A patented, one-of-a-kind solution

Our technology is all about adding compressed air that penetrates the drainage perforation and separates organic contamination or such like from the mass without fragmenting the rags, which instead can be compressed in any way you wish. Furthermore, the product keeps the perforation clean and is self-cleaning; thus, no brushes are required, as is common in many other solutions.

“The machine receives separated screenings from the previous process. After which service water or technical water are added, and then a wash cycle starts with the help of the patented compressed-air function. After a completed wash cycle, the wastewater valve opens, the screw starts and the compression phase is initiated. We believe many will be curious about this new product and that we can find more customers who can see the benefits based on their perspectives and specific markets.”

Tried and tested at a wastewater treatment plant

To ensure the functionality of the Wash Press Gamma WPG, it has been tested in the operation of a wastewater treatment plant over a two-year period with careful monitoring.

“It has run without any issues and we can achieve 60 per cent dry substance content, compared to approximately 35 percent with conventional technology.”

Facts about our Wash Press Gamma WPG

  • Keeps the drainage perforation clean without the need for brushes.
  • Hardox-reinforced screw in the compression zone will provide up to 25 per cent longer lifespan without reducing capacity.
  • Optional grease removal in the application if there is no possibility of handling grease in subsequent process phases.
  • The aerosol trap is standard to protect the ventilation system from excessive moisture and dirt.

Showing the way to a climate-neutral water industry

Hydria Water is partnered with many municipalities and other actors in water treatment. We are actively driving the transition to a climate-neutral water industry by 2030. As part of this, we have developed an online energy saving tool, where you can quickly and easily see what you can save in energy consumption and money by investing in modern sedimentation equipment.

– Many of Sweden’s roughly 1,200 water treatment plants have old equipment. Older sedimentation equipment consumes a lot of energy, says Jörgen Edelmalm, Service Manager at Hydria Water.

Today, wastewater treatment plants sometimes choose to lower the requirements for water treatment to lowest approved levels in order to save energy, thinking that you have to choose one or the other.

– Lowering the purification level to the lowest approved measurement value is not the only way to save money, facilities do not have to choose between clean water and low energy costs at all.

By investing in modern equipment for separation and screening, it is possible to purify used water very efficiently, at a significantly lower cost. Read about how a plant in Patra, Greece reduced its electricity consumption by 66 percent by switching to modern equipment from Hydria Water here.

– With the energy saving tool, we have the opportunity to help our customers and partners make wise investment choices. Facilities must be able to have both optimal levels of water treatment and low energy costs, says Jörgen Edelmalm.

Today, wastewater is included as a useful resource in the water cycle. It is the municipalities’ mission to manage used water in a way that minimizes environmental impact and pollution. With our energy saving tool, Hydria Water gives municipalities and facilities the possibility to invest wisely and energy efficiently, both in the short-term and the future.

Feel free to contact us if you want to know more.

Modern technology significantly lowers the costs of municipal water treatment plants.

With modern technology, the costs of municipal water treatment plants are significantly reduced. Hydria Water’s new online energy saving tool shows how much plants can save.   

Not only can municipalities save a lot of money by switching to modern water treatment equipment, there are also important environmental benefits.  

 – Thanks to our environmentally beneficial modern equipment, municipalities save a lot of money without having to sacrifice environmental and sustainability goals”, says Tobias Barrstrand, CEO, Hydria Water.  

Read the Swedish press release here.  

Hydria Water launches energy saving tool

Hydria Water has developed an online energy saving tool. The tool allows wastewater and water treatment plants to quickly calculate and see how much energy and money can be saved by switching to modern equipment, such as high-efficiency sedimentation solutions.  

– As energy prices increase, there is a risk that plants will reduce treatment requirements to save money. There is no need to choose one or the other; modern equipment can treat water efficiently at a lower cost. We want to illustrate this with the tool”, says Andreas Riedel, Technical Manager at Hydria Water. 

Hydria Water develops products and solutions that convert wastewater into new resources. The new energy saving tool enables municipalities and facilities to make wise investment decisions, so that used water can be harnessed as a circular resource, today and in the future.  

Calculate your savings here.

Swedish manufacturing for a modern and sustainable production

Hydria Water is owned by the Swedish family-owned group Hydria Group. Our headquarters and production are located in Borås, where we manufacture all our products. In addition, we have a competence center and an aftermarket department in Skövde. The aim is to be a long-term partner and our efforts have resulted in us being nominated for the Great Sustainability Award established by Borås Näringsliv, the University of Borås, the City of Borås, and Sparbanken Sjuhärad to inspire and encourage sustainable development that generates growth.

– By manufacturing all products in our own local production, with a high degree of competence and a curiosity for the future, we are a part of the process of turning wastewater into a resource. The operations in Borås ensures that development and production are carried out in a modern and sustainable way, says Kristoffer Lindberg, COO at Hydria Water.

The manufacturing process has a flow-optimized production line in the 5,000 square meter industrial facility.

Our facility also has one of Borås’ largest solar cell facilities at 1,000 square meters. It covers almost 50 percent of our energy needs and means that we annually spare the world more than 45 tons of carbon dioxide emissions.

Our objective is an optimized and sustainable manufacturing process with room for further growth.

– We want to be a driving force in the transition to a climate-neutral water industry by 2030. This means that we are constantly working towards refining our processes and finding solutions for a more climate-neutral production.

Higher quality of the purification process with the new Gamma WPG

Following a year of development work and two years of field tests, the Wash Press Gamma WPG is now being launched. This is a market-unique solution for compacting, dewatering, and washing screenings.

– We have developed a completely new technology that results in less wear and need for maintenance with an almost doubled capacity for dry solids content, says Andreas Riedel, technical manager at Hydria Water who is responsible for the project.

Today, some competing products use a technique where you separate contaminated materials from rags and screenings with an impeller solution. The main issue with that technology, according to Andreas, is that the screening is dewatered too harshly, and the process leaves a higher degree of residual particles in the reject water. In addition, existing technology runs a higher risk of significant wear and tear as there are fast moving parts in a highly contaminated media.

– Our technology involves supplying compressed air that passes through the drainage’s perforation and separates organic impurities and the like from the solids, without breaking the rags, which can instead be compressed as desired. Our product also keeps the perforation clean and is self-cleansing, so no brushes are necessary as in many other solutions.

Gamma WPG is a market-unique and patented solution.

– We believe that many will be curious about the product and that we can find several customers who see the advantages in it based on their unique perspectives and their specific markets.

To ensure the functions of the new wash press, it has been tested at a treatment plant for two years with careful follow-ups.

– It has worked without any issues. We have seen that we can get up to 60 percent dry solids content, compared to about 35 percent with conventional technology.


  • Keeps the drainage perforation clean without the need for brushes.
  • Hardox-reinforced screw in the compaction zone provides up to 25 percent longer life without capacity reduction.
  • Possibility of fat separation in the application if there is no possibility of fat handling in subsequent process steps.
  • Aerosol trap, airborne particles, as standard to protect the ventilation system from too much moisture and aerosols.

Would you like to know more about the new Wash Press Gamma? Feel free to contact us for more information.