Croatia – Construction work for pipelines, communication and power lines – Sustav odvodnje naselja Drenovac-Bučje-Zagrađe na području aglomeracije Brodski Drenovac - dionica Bučje-Zagrađe i UPOV

The subject of the procurement is the construction of a gravity sewerage network in the settlement of Bučje and Zagrađe, which is carried out with PVC DN 315 mm pipes in a length of 5,525 m, PVC DN 250 mm in a length of 382 m, PVC DN 160 in a length of 1,360 m, construction of pressure sewerage in a length of 1,845 m, which is carried out with PEHD pipes DN 110 mm and three (3) pumping stations that need to be connected to the monitoring and management system of the sewerage and construction of UPOV in the Brodski Drenovac settlement with a capacity of 1,300 ES II. The degree of purification that should be connected to the monitoring and management system of sewage. The works include preparatory work, trench excavation, bottom planning, preparation of a base for laying pipes, supply, transport and installation of PVC and PEHD pipes, preparation of pipe lining, backfilling of the rest of the trench with excavated material and replacement material, removal of excess earth material, construction of manholes, CCTV inspection, water tightness testing, rehabilitation of asphalt surfaces. Wastewater treatment will be carried out using a typical device with a capacity of 1,300 ES of the second stage of treatment, activated sludge treatment with extended aeration and simultaneous sludge stabilization, conventional technology without primary sludge with a centrally located secondary settling tank. The designed device consists of an inlet channel with a track screen and a flow meter, a bioaeration basin with a secondary settling tank and an aeration system, an outlet inspection chamber, a silo for excess sludge and a machine room with a compressor station and a monitoring and control center. After the completion of construction, mechanical and electrical works, testing, commissioning, a trial run of two months is planned, during which the Client's staff will be trained. The operation of the device does not require a permanent crew, and monitoring and control are carried out...