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Rainwater and melt water from the 93.3 ha territory of Žvėrynas, Karoliniškės, Viršuliškės and Šeškinė districts are directed to the new treatment plant. Two custom-made 14m long and 3.5m diameter sand traps with built-in oil separators in France clean up to 750 l / s of rain and melted snow. The discharged sewage contamination parameter monitoring system transmits data to the Grinda central control center: if at least one contamination parameter is exceeded, the on-call employee will be able to remotely stop the discharged flow of contaminated sewage by activating shutters electrified.
All elements of the surface wastewater treatment plant are hidden underground. The cleaning team consists of:
· Steel distribution chamber (for distribution of wastewater to treatment plants).
· Suspended solids compartment (2 x 75,000 liters volume);
· Oil products collection department (2 x 34,000 liters of volume);
· An automatic shut-off valve is installed in the flow connection chamber: when the concentration of petroleum products exceeds the permissible limits, the entry of wastewater contaminants into the Neris river is stopped;
· The treated wastewater is discharged into the Neris river with a new collector of 1638 mm diameter.
The surface wastewater treatment plant on Upės Street is part of a major project to rebuild surface wastewater networks on T. Narbuto-Saltoniškių streets. Some 2,200 m of surface sewage networks of various diameters are being rebuilt here, sewage collection wells, distribution and service chambers are being installed.
Works of this scale in an urbanized area are extremely complex: electricity, heat, gas, water supply, domestic sewage, and communication networks run under busy streets. This is why the new surface sewage collector on T. Narbuto-Saltoniškių streets is being built through underground drilling (micro-tunnel), reducing traffic restrictions and construction time.
“The management of surface wastewater systems in Vilnius is one of the largest and most important regional projects of the decade, not only in the capital, but also throughout Lithuania. Perhaps that is why there were no contractors in Lithuania who could undertake such a complex project, which is why the company took the initiative to implement this project on its own. As a result, T. Narbuto Street will no longer be flooded due to heavier rains and rainwater will be treated, therefore relevant environmental problems will be resolved, ”says Kęstutis Vaicekiūtis, Director of UAB Grinda.
The reconstruction project of the T. Narbuto-Saltoniškių street rainwater network was announced as the best in 2019. BIM project of Lithuanian engineering networks. Reconstruction is planned to be completed by 2020. Final. Its preliminary price is 5.14 million. euros
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