The Polish authorities, through AQUANET, have developed a programme for foul odour abatement at the Kozieglowy WWTP. The programme was co-funded by EU Cohesion funds and consists of three main stages: the construction of a sludge drying plant (completed in 2008), the building of a biogas facility, and an odour control system with trickling filters along with geodesic aluminium structures to cover the primary settling tanks. The contract for this latter stage was awarded to Spanish company JSF Hidráulica, who supplied its Alusphere® geodesic aluminium structures.
The Kozieglowy WWTP is located in the northeast of the Poznan region, on the right bank of the Warta River and occupies a surface area of approximately 60 hectares. The water treatment line consists of physicochemical and biological treatment for nutrient removal, and sludge treatment. The plant has a treatment capacity of 200,000 m3 per day.
Alusphere® geodesic aluminium structures, built by Spanish company JSF Hidráulica, were selected to cover the four primary settling tanks. These structures are designed to withstand the most severe operating conditions: wind speeds of up to 80 km/h, snow loads of up to 0.9 kN/m2 and temperatures ranging from -31ºC to 41ºC. Alusphere® aluminium domes are three-dimensional self-supporting structures capable of covering spans that would be technically impossible to cover with other types of roofs (e.g. roofs made of glass fibre reinforced polyester). The settling tanks have a diameter of 52 m (as large as that of many bullrings) and a height of 6.6 m (a requirement under local town planning legislation).
Article published in: FuturENVIRO September 2014