Exploitation of biogas of Sanitary Landfill of Municipality of Ano Liosia, Greece

    The Company
    The company BEAL SA is a partnership between HELECTOR S.A and the Australian company Energy Developments Ltd. The two companies hold the 50 % of the total shares. BEAL SA owns and operates the cogeneration facility fueled by biogas (landfill gas) from AnoLiosia landfill, which which began operating in March 2001 with installed capacity of 13,8 MW. The expansion, in October 2006, by 9,7 MW raised the total installed capacity to 23,5 MW, making the plant one of the largest of its kind in the world.
    The total investment cost  amounted to 35.5 million, which was funded by Ministry of Development programs up to 45%.
    The electricity produced by the facility is sold to LAGIE SA (Greek Power Market Operator) while thermal energy is produced  from the waste heat of power generators in the form of hot water.

    Plant Description
    The power station was implemented in two phases. The first phase included the installation of 11 gas engines DEUTZ TBG 620 V16 with each engine’s  power 1.26 MW and aimed at utilization of biogas from the old (uncontrolled)  landfill and the Sanitary Landfill 1 in AnoLiosia region. The operation of the first phase began in March 2001. In 2005, with the potential use of biogas from the Sanitary Landfill landfills 2 also in AnoLiosia, the station expanded by 9.7 MW with the installation of 4 gas engines GE Jenbacher JGC 620, 2,43 MW each. The station with total installed capacity of 23.5 MW consumes about 12,000 m3 / h of biogas which is pumped and driven to the station through a network of vertical and horizontal pipes. The biogas prior entering gas engines is treated through cooling and dehumidification process according the engines’ specifications.
    Moreover the recoverable heat from the new engines can be utilized in the evaporators of the nearby leachate treatment plant which is owned by Attica Waste Management Association.  

    Environmental Benefits
    The main environmental benefit from the operation of the station lies in the the destruction of the methane (CH4) produced within the landfill (21 times more effective than CO2 on greenhouse effect) while renewable electricity and heat is produced.
    The station can produce annually about 175,000,000 kWh of electricity by replacing fossil fuels that otherwise would be required for the same  energy output. This prevents the  additional release of carbon dioxide by  148,000 t / y.
    Finally the utilization of the recoverable heat in the leachates evaporators can save oil consumption up to 400 l/h.