This is Gryaab and the Rya WWTP
Gryaab is the regional municipally owned company that owns and operates the Rya WWTP and the tunnels leading to the WWTP. Local sewers are owned and operated by the municipalities themselves.
The Rya WWTP has treated the wastewater from the Gothenburg region for just over 50 years. Starting with relatively simple treatment in 1972 the WWTP has been rebuilt or expanded every decade to manage stricter effluent standards with minimal footprint. Variable flows are treated by using compact process technology and flow dependent control strategies at the WWTP. The large volumes in the tunnel system are used to even out the flows, using dynamic flow control.
The next expansion, to be completed by 2036, is being planned at present. The effluent standards will be stricter and the population larger, whilst the flow situation may still be difficult for decades to come. This time additional basins will be placed on “new” land, although as always carefully optimized to complement existing structures.
Theme 1 (max 50 people): Process control – from flow modelling to on-line process analysis Fully booked!
Developing and using adaptive plant process controls and predictive modelling for inflow control. How did we get to where we are and where are we heading? Including challenges of daily operation.
Detailed description: Come along and hear the story on how we have improved process control and instrumentation calibration over time and how flow division between different process units is governed.
Gryaab not only operates a decent sized wastewater treatment plant but also a unique network of wastewater tunnels underneath Gothenburg city. See and experience how the integrated dynamic flow model ‘Future City Flow’ assists our control room to determine the needed capacity in the tunnel system and to control incoming flow in relation.
Theme 2 (max 40 people): Robust building – challenges of construction and expansion with limited space
Gryaab has a track record of several decades of major plant expansions whilst maintaining full plant operation. All these expansions have paved the way for upcoming treatment plant expansion ‘Nya Rya’ that is to meet the requirements of new strict emission standards.
Detailed description: Hear and see how the Rya WWTP site has been built to its brim with a major new expansion each decade since it’s foundation in 1972. Included in the tour for example is the disc filtration building that won the prestigious Kasper Salin -architecture prize.
Now it’s time for yet another expansion but space has run out. How does the available space on “new” land affect process selection? How to overcome key challenges in the project inclusive combining the existing and new treatment stages and lack of space for all connected arrangements?
Theme 3 (max 60 people): Top out – treating and managing high flows in a growing city
The Rya WWTP is custom made to handle high and variable flows on a limited site. This tour will focus on the treatment processes and control strategies that allow Gryaab to balance on the thin edge between energy and treatment efficiency.
Detailed description: Rya WWTP is characterized by its high and variable inflow. Combined sewage systems in large parts of the city in combination with high rainfall produces massive amounts of infiltration and inflow to the treatment plant.
See how the processes have been chosen and optimized to handle large volumes of dilute wastewaters. Which steps are taken to equip the plant for even higher future loading and flow variations? How is sewer modelling used to control flows as well as to plan for the future? How can the WWTP be extended to reduce nutrients and organic matter even further by 2036?
Theme 4 (max 40 people): The long haul – Circularity: business, environment, and economy in balance Fully booked!
What’s in the future? Learn more of the key challenges and possibilities Rya WWTP is facing with new environmental permit, economy, and business development in the field of resource reuse.
Detailed description: Hop on the bus! We take a trip with an amphibious bus on land and water and tell you about the possibilities of the future and our approach to own them.
Gryaab is facing a new environmental permit and increasing amount of people connected to the treatment plant. At the same time, Gryaab sees plenty of possibilities and a demand for new products, for example cooling water to NOVO Energy battery factory. We think we have the key to financing circularity, climate neutrality and the increasing requirements from authorities.
Learn what actions is Gryaab engaging in to make long-term development happen in the environmental permitting process, Gryaab’s organization and expertise and its economic models. Meet Gryaab’s CEO, CFO, Chief of Project, and Chief of Nya Rya.
