Monthly Archives: September 2021

Wooden scrapers from 1972 put out to pasture

Vidön Wastewater Treatment Plant in Hammarö Municipality, Sweden, had four sets of wooden scrapers in operation dating from 1972, which were past their best. The high quality of previous deliveries led the municipality to contact Hydria Water to find out what a modernised solution might look like.

The replacements were designed based on feedback from workers at the facility regarding equipment and technical specifications. For Hydria Water, the project involved removing the old scrapers and delivering and installing four new plastic chain scrapers.

Today, the Vidön Wastewater Treatment Plant has been modernised, with a well-thought-out and sustainable solution in place.

Hydria Water Vidön reningsverk

New gravity thickener at Kungsängsverket, Uppsala

Kungsängsverket is the largest of Uppsala Vatten’s wastewater treatment plants. It treats the wastewater generated in the area, including by homes and companies, and purifies roughly 20 million cubic metres of sewage water annually.

Due to the fact that Kungsängsverket’s entire heavy-duty purification step will need to be replaced in the next few years, Uppsala Vatten will need to make significant investments in the near future. In order for the rebuilding for the new heavy-duty purification step to take place, several other processes at the wastewater treatment plant needed to be upgraded. We were asked to develop a solution in which two rotating sludge scrapers, which had not been in operation for many years, were upgraded to centrally driven rotating gravity thickeners. The new machines have a hanging mounting system, so in order to install them Hydria Water manufactured new bridges with a truss construction.

The project was carried out in collaboration with Miva Montage AB, and installation took place in early 2021. The new gravity thickeners have been placed in the tanks just inside the entrance gates to the wastewater treatment plant, so are the first things a visitor is greeted by when they arrive.

Hydria Water Kungsängsverket Uppsala Miva Montage