Contacts

ManagEnergy is a technical support initiative of the Intelligent Energy - Europe (IEE) programme of the European Commission which aims to assist actors from the public sector and their advisers working on energy efficiency and renewable energy at the local and regional level.

Portinho da Costa - A Water Treatment Plant with a cogeneration system for electricity and heating production, Portugal

Type: CaseStudy

PDF IconDownload the Case Study:
English English DeutschDeutsch EspañolEspañol FrançaisFrançais ItalianoItaliano PolskiPolski

PDF IconELAC_2: Sector dos Resíduos - Co-geraçao a biogás em ETARs Municipais

Summary

The Portinho da Costa Water Treatment Plant covers approximately 24% of the residual water treatment in Almada Municipality. The produced biogas is used in a cogeneration system to produce electricity and heat. Thanks to this cogeneration system, the consumptions of natural gas and electric energy have been reduced with 67%. In terms of watts this is equivalent to a reduction of 2000 MWh per year. At environmental level, the use of this technology has reduced the emissions of greenhouse gases (CO2) with 39% or 687 tons. This Water Treatment Plant has the best and most advanced technologies and has a great treatment efficiency (the percentage to remove organic substance is 96%).

Results

With the use of a cogeneration system, the consumptions of natural gas and electric energy was reduced with 67%, in terms of watts this is equivalent to a reduction of 2000 MWh per year. At environmental level, the use of this technology has reduced the emissions of greenhouse gases (CO2) with 39% or 687 tons.

The Water Treatment Plant in the Municipality of Almada are now treating all residual water and thanks to the installation of a cogenerations system that transform biogas into electric and thermal energy no greenhouse gases emissions are released to the atmosphere.

Lessons learned and repeatability

Installation of a Water Treatment Plants is almost always associated with an increasing of greenhouse gases emissions. These emissions derives from three different sources - energy consumption in the different phase of the treatment, storage of the muds in landfills and the release of biogas to the atmosphere from the anaerobic digestion of the mud. With an installation of a cogeneration system in a Water Treatment Plant, it is possible to use the biogas for electricity and heat production. This sustainable technique can easy be used also in other countries.