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Sewerage network

In Wrocław exists within the Old Town (Stare Miasto) a general combined sewerage network, the residential areas built directly after the second world war have a mixed sewerage system – partially separate, partially  combined. The new central residential areas have already separated sanitary sewerage network and drainage network. Only the residential areas on the outskirts of Wrocław do not possess a sewageerage system yet.
The length of the sewerage network of Wrocław managed by MPWiK is over 1418 km. The oldest parts of the sewerage network date back to 1850.  Most of the sewerage network was built in the years 1900-1940.
Connecting all inhabitants residing in densely populated areas will take at the latest by 2015. The sewerage network  will be ultimately used by approx. 97% of inhabitants.

The analysis of the technical condition of sewerage network is made by CCTV inspection. Use of television ameras allows efficient detecting of damages and identifying sections requiring urgent modernisation. Most of the channels is located along the streets, thus repairs and renovations of sewers usually take place at the same time as repairs of streets conducted by the Zarząd Dróg i Utrzymania Miasta (Roads and City Maintenance Authority). More and more renovations are carried out by using trenchless methods allowing to minimize traffic disruption.

Wrocław, by virtue of its location on flat terrain has 40 sewage pumping stations and one storm water pumping station which are spread all over the city. 2001 MPWiK put into operation a modern sewage pumping station Nowy Port which allows to pump sewage from south-western areas of the city to Wrocław Janówek Wastewater Treatment Plant (in short: WOŚ).


Now wastewater after passing through sewerage network is directed to one of two wastewater treatment plants:

Wastewater to the wastewater treatment plant is led by gravity channel systems consisting of sewage collectors, e.g. Odra, Ślęza, Bystrzyca, Kolektor Południowy, Kolektor Północny (South and North Collector) as well as by a large system of residential areas networks and sewage connections.

Expansion WOŚ successfully completed! Read

Before WOŚ was built, the biggest wastewater treatment plant of Wrocław were the Irrigation Fields Osobowice as a natural wastewater treatment plant founded in the 19th century in the north area of Wrocław. Over the coming years, by taking advantage of assistance from the European Union funds inconveniences for local residents caused by the fields will gradually decrease.


MPWiK SA Wroclaw implements the project Fri. “Monitoring the sewage system.” The aim of the project is to provide information about the amount of sewage flowing main collectors in the city. From 20 to 29 February 2012. Was carried out installation of eight portable flow meters for collectors: Odra, Bystrzyca, Ślęza, Północ, Południe and tributaries for pumping sewage Port Północ and Południe . Each flow consists of two components: the ultrasonic sensors mounted in the channel and the flow meter mounted in the well.

Flow collect data that will allow the determination of the amount of sewage flowing main collector sewer in the city, both during precipitation and dry weather. This information is necessary for the Centre of New Technologies for the implementation of the projects related to the sewage network and are a source of valuable knowledge for operational services


The Wrocław Wastewater Treatment Plant (WOŚ) is mechanical – biological wastewater treatment plant using the method of elimination of phosphor compounds in a chemical way with the capacity of 140.000 m3/d. The facility is located at the north-west end of Wrocław.

The wastewater pumping system together with the existing combined and separate sewerage network allows to direct the full wastewater stream from the city area to the Wrocław Wastewater Treatment Plant.

Wastewater pre-treated on thin and thick grids and then in blow-off grit chambers is pumped to distribution chamber before initial clarifiers. In distribution chamber coagulant is added in order to increase the efficiency of removing pollution in initial clarifiers. Wastewater treated in clarifiers is directed through the receiving chamber to aeration tanks. In aeration tanks wastewater is treated using the activated sludge method. After biological

treatment process wastewater is directed to secondary clarifiers, where takes place the separation of activated sludge suspension from wastewater. Treated wastewater is discharged by an exit channel to the Odra River

In order to reduce costs and for protection of aquatic resources, and in this case of tap water, the wastewater treatment plant uses treated wastewater as process water for technological and operation purposes. By a system of local pumping stations water is delivered first of all to the following facilities:

  • Bar screens hall
  • Excessive sludge mechanical compression building
  • Fermented sediment mechanical dewatering building
  • Drying unit.

An integral part of the wastewater treatment process is the generation of waste and sludge. The substances detained on bars after being compressed are collected in containers and then transported by trucks for utilization by third parties possessing appropriate authorizations and permits. Sand separated in grit chambers is pressed to sand traps. Separated sand is collected in containers and then transported by trucks for utilization by third parties possessing appropriate authorizations and permits.

Sludge from initial clarifiers is directed to gravity thickeners. Thickened sludge is transported through mixed sludge tank to separate digesters (WKF). A part of sludge from secondary clarifiers goes back to biological blocks (re-circulated sludge), and another part is pressed to the sludge mechanical compression building (excessive sludge). Excessive sludge after compression and homogenization is directed to mixed sludge tank from which it is pressed together with initial compressed sludge to separate digesters. The separate digesters are used for mesophilic fermentation of initial and excessive sludge. Fermented sludge is transported from digesters to fermented sludge tanks used as buffer tanks for sludge before the dewatering process.

Sludge dewatered on filter presses is directed for liming (hygienisation by fired lime) or to sludge dryer. Hygienised sludge is loaded onto trucks and transported by trucks for utilization by third parties possessing appropriate authorizations and permits. Sludge after frying and palletisation (optionally) in granular form is loaded onto trucks and transported by trucks for utilization by third parties possessing appropriate authorizations and permits. A product of the mesophilic fermentation processes of sludge in separate digesters is among others biogas – flammable gas composed of 61-65% methane, 30% carbon dioxide, 1% other gases (among others nitrogen, oxygen, ammonia, hydrogen sulphide), water. Biogas after desiccation, purification and desulfurization is used for production of electricity and heat for own needs of the wastewater treatment plant.


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