Two projects to modernise a waste water treatment plant in the capital

The North Pest Wastewater Treatment Plant, which has been operating since 1980, receives and treats all the wastewater of the four districts of Budapest - IV, XV, XVI, XVII - and a part of the wastewater discharged into the sewerage system in four districts, using the most modern technology. The plant in Újpest also treats wastewater from the agglomeration areas, with a capacity of 200 thousand cubic metres per day. On average, 130 thousand cubic metres of wastewater are treated every day. On an annual basis, the operation generates 1500 cubic metres of inorganic waste and 50 thousand cubic metres of dewatered sludge.

The wastewater treatment plant is constantly being improved

Over the past few decades, investments have been made to modernise the industry. The two current developments involve upgrading the sewage sludge reception facility and the plant's air supply. According to the announcement published in the public procurement notice, the best bids for these tasks were submitted by Colas Alterra Építőipari Zrt.

Sludge is used as biogas

Wastewater from the agglomeration of the capital and the eight districts of Budapest is first mechanically treated, with the use of grids and filters to remove particulate, greasy and oily contaminants, and sand by sedimentation. After a further filtration, it is sent to a pre-settling tank. Eleven-sludge technology is used to remove organic substances - nitrogen, phosphorus - from the water, thus preventing sludge formation. After the biological treatment process, the sludge and treated effluent are sent to final sedimentation tanks. From there, the treated wastewater is discharged into the Danube and the sludge is recycled to produce biogas, which covers almost all of the plant's energy needs. In addition, as organic fertiliser

Sludge trap and air distribution system to be modernised

The Colas Alterra Zrt. specialists are converting and modernising one of the sewage sludge receiving structures of the plant. They will also rebuild the structure of the sludge reception bunker and modify the pump. They will also include a hydraulic underwater grab and increase the capacity of the crane track and the hoist.

The development will raise the two sewage sludge reception facilities of the treatment plant to almost the same technological level.

In another project, the Colas Alterra Zrt. specialists will carry out the design and construction tasks in Phase I of the air supply modernisation of the biological line "A" of the North Pest Wastewater Treatment Plant. The key operation in sludge treatment is the oxygenation of the settling basins, which is achieved by air injection. In the first phase of the upgrade, existing Oxytube elements will be replaced in sixteen corridors. The old air distribution system will be dismantled and a new fine bubble distribution system will be installed by modifying and upgrading the piping system.
The two works will cost approximately 380 million forints to complete.