22 February 2013

ENERGY FROM WASTEWATER TREATMENT PLANTS

National Studies

The UNDP CEDRO project in collaboration with the Ministry of Energy and Water has published a study on Energy from wastewater sewage sludge in Lebanon. Sewage potentially contains as much energy as it needs to treat it, however in Lebanon all but one wastewater plant in Tripoli is currently utilizing this fact. The report detailed available treatment processes demonstrating the consequences on sludge quality, energy production and energy consumption. It also completed a background study on available similar projects in Lebanon, their specifications and current statuses; it finally reviewed the technologies and presented guidelines for each future project. The study revealed that bioenergy from waste water sludge could account for 3-4% of the national bioenergy potential identified in the Bioenergy Strategy Plan published by CEDRO in 2012.

Five waste water treatment plants (WWTP) in Sour, Aabde, Sarafand, Saida, and Majdal Anjar meet the conditions required for the implementation of a sludge Anaerobic Digestor. The total primary energy expected from these plants is estimated at 143,000 MWh, for an installed electrical power of 5.9 MW.

The report also shows that the addition of sludge from nearby small to medium WWTP and co-substrates allows an average increase of 70% in energy production compared to the digestion of sludge only, and results in an installed electrical power of 11.6 MW for an estimated total primary energy of 237,700 MWh.

Altogether, these projects allow the reduction of greenhouse gas emissions by approximately 35,000 tons of CO2-equivalent per annum.

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