Vodokanal will close direct wastewater discharges to the Karpovka River until the end of 2019

20.06.2017

In 2017, SUE “Vodokanal of St. Petersburg” will start implementation of the project "Construction of networks for diversion of untreated combined and municipal wastewater discharges in into the Karpovka River Petrogradskiy District".

The project of closing direct wastewater discharges into the Karpovka was supported by the city authorities: when St. Petersburg budget was amended, the project costs were included into the Target Investment Program for 2017 and for the target period of 2018-2019. The total cost of works is RUB 352 million. The project is scheduled to be completed by the end of 2019.

Direct discharges to the Karpovka River are one of the sore spots on the city map. The river flows through Petrogradskiy district in the historical center of St. Petersburg between the Bolshaya Nevka and Malaya Nevka rivers. Based on the results of the quality control of wastewater coming via direct discharges to the Karpovka, significant excesses of the maximum permissible concentrations of harmful substances in water as well as significant microbiological contamination are constantly recorded.

The project "Construction of networks for diversion of untreated combined and municipal wastewater discharges in Petrogradskiy District along the Karpovka river" will allow closing of 15 direct combined and municipal wastewater discharges with the amount of  about 2 thousand cubic meters per day (766.5 thousand cubic meters per year). It is also planned to divert stormwater runoff and stormwater receiving discharges into the Karpovka River being under the specified scope of works.

The project has already obtained a positive opinion from the State Expertise Center.

In the nearest future, a tender to select a construction and installation works contractor will be announced.

Under the project, new tunnel collectors diverting direct discharges will pass along the two banks of the Karpovka river: from Barochniy bridge to Medikov Avenue and from Petropavlovskaya Street to Petrogradskaya Embankment. In total, it is necessary to build 2,055 m of networks with a diameter of 250 to 1330 mm. The works will be conducted in the protective buffer zone and will be carried out both by digging and no-dig methods.

The existing power supply lines, water and gas networks are needed to be relaid in the framework of the project requiring coordinated work of all city services.

The implementation of the project will significantly improve the environmental situation in Petrogradskiy district and in St. Petersburg in general.

It is to be recalled that that 98.5% of wastewater in St. Petersburg is treated today. Wastewater coming to Vodokanal WWTPs is treated in accordance with all Russian and international standards including the nutrient content recommendations of the Baltic Marine Environment Protection Commission.

Vodokanal is constantly working to close the remaining direct discharges. 1.5% of wastewater to be treated has its own specific characteristics. As a rule, these are direct discharges in the central districts of St. Petersburg with dense urban development. Their flow is small but implementation of technically complex and financially costly projects is required to eliminate them. One of such projects is closure of direct releases into the Karpovka River.

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