Combined design and construction works for the Krīgeri wastewater treatment plant sludge thickener system and renewal and reconstruction of the treated wastewater outlet in the Dobele agglomeration

Summary

The tender covers combined design, construction and author supervision for the sludge thickener system and the renewal and reconstruction of the treated wastewater outlet at the Krīgeri wastewater treatment plant in the Dobele agglomeration. The works include a gravity sludge thickener, reconstruction of pumping stations, sludge-system integration, heat-pump and heating solutions, SCADA connections, outlet reconstruction, equipment installation, commissioning and handover. The estimated contract value is EUR 396,255 excluding VAT, and the tender must be submitted electronically by 5 October 2026. The overall contract period may not exceed 18 months, including up to 6 months for design. The work must achieve annual electricity savings of at least 8,490 kWh and greenhouse-gas emission reductions of at least 0.624 tonnes of CO2 during the warranty period. The contract is not divided into lots, and the economically most advantageous tender is selected using price, key personnel experience and equipment warranty duration.