Water

Sofia wastewater plant expands biogas production unit

Sofia wastewater plant expands biogas production unit

Photo: Sofiyska voda

Published

November 7, 2021

Country

Comments

0

Share

Published:

November 7, 2021

Country:

Comments:

0

Share

Sofiyska voda presented its new digester at the wastewater treatment plant in Sofia. The tank, which cost EUR 3.1 million, increased the biogas production capacity by 25%.

The wastewater treatment facility near Kubratovo in Bulgaria’s capital city added a digester of 7,000 cubic meters for sludge fermentation. It is operated by Veolia’s subsidiary Sofiyska voda, which produces drinking water and manages wastewater for 1.4 million people in Sofia.

The French company said the plant is the second in terms of energy efficiency among its 2,500 units. The construction of the digester, a tank for the extraction of biogas from waste sludge, cost EUR 3.1 million and it will increase the capacity of green energy production by 25%, according to the announcement.

Contribution to circular economy

The firm already has four digesters, built in 1984, OFFNews.bg reported, adding the new tank would enable the company to upgrade the old ones. The methane from the sludge fuels a cogeneration system, which produces 24 GW of electricity per year.

Sofiyska voda operates four drinking water and two wastewater treatment plants as well as three combined heat and power units. It said it plans to build another cogeneration unit.

After the sludge is stabilized in the digester, it is dewatered and donated to farms for fertilizing certain types of crops, the firm said and added the material is rich in phosphorus and nitrogen. It sends the purified water to the Iskar river, completing the circular economy cycle.

Sofia wastewater plant biogas production
Photo: Veolia

More than self-sufficient

Sofiyska voda stressed its biogas and cogeneration system protected it from the recent spike in electricity prices as the output is 10% higher than the consumption of the wastewater treatment plant. The firm added it aims to become fully energy independent. The Kubratovo facility processes more than 350,000 cubic meters of wastewater a day.

The Sofia Municipality owns 22.9% of the Sofiyska voda. The utility asked the citizens not to throw wet wipes into the sewer, explaining that the material causes congestion in wastewater treatment plants.

A similar wastewater treatment plant with a biogas cogeneration system was recently built in Kruševac in neighboring Serbia.

Comments (0)

Be the first one to comment on this article.

Enter Your Comment
Please wait... Please fill in the required fields. There seems to be an error, please refresh the page and try again. Your comment has been sent.

Related Articles

waste-export-eu-ban-truck

Waste is a resource: EU to impose stricter rules, ban plastic waste export

24 January 2023 - The EU is looking to ban the export of all waste intended for disposal, as well as plastic waste shipments to non-OECD countries

form-energy-iron-air-battery-first-factory

Iron-air batteries are 10 times as cheap as lithium, and will be produced from 2024

24 January 2023 - To replace lithium, alternatives are being developed around the world, such as iron-air batteries, whose commercial production will begin in the US in 2024

luzerath-village

Coal wins battle against climate action in tiny German village

20 January 2023 - The eviction of the village residents and the coal mine expansion are a result of the German government's compromise with RWE

dollar-usaid-investment-energy-project

USAID issues call for USD 20 million regional energy investment project

17 January 2023 - USAID's project aims to find investors for commercially and environmentally sustainable energy projects in the region