| Abstract [eng] |
Considering the increasing energy demand, the research of the alternatives for energy production is of increasing relevance. The main reason is the depletion of fossil fuel resources. The alternatives for energy production discussed in this paper are considered as landfills (extraction of methane and excavation of SRF - solid recovered fuel) and renewable energy sources (wind turbines, solar modules and energy plantations). These energy generation alternatives for closed landfills are not yet investigated in Lithuania and the goal of this study is to calculate and compare the energetic potential of mentioned alternatives. The object discussed in this paper is Alytus regional landfill (old and new sections). Knowing landfilled waste quantities and composition in 1990-2012 determined using LCA-IWM tool and meteorological data from Hydrometeorological Service, it is possible to evaluate different energy recovery alternatives for landfill. Landfill gas quantities were determined using Petäjä tool; the quantities of solid recovered fuel after biodegradation were determined using first order decay formula and heating values were calculated using Dulong’s formula. Finally, energy potential for all the alternatives were calculated and six scenarios combined of mentioned components have been evaluated. The results showed that energy potential from methane is 65 GWh for the old section in 2007-2050 and 62 GWh for new section in 2012-2050 year; energy potential from solid recovered fuel is 144 GWh for old section and 108 GWh for new section when landfill mining activity is implemented in 2014 and 2020 year respectively; energy potential from renewable resources is: for solar modules – 0,53 GWh/y and 0,32 GWh/y; for wind turbine – 0,02-0,13 GWh/y and for energy plantations – 0,02-0,04 GWh/y respectively for old and new section. According to this results, the six scenarios were evaluated and it could be stated that solid recovered fuel and methane are the main valuable components for energy production. The most optimal scenario could be Scenario 1 consists of energy production from methane in 2007-2013 and 2012-2019; from SRF in 2014 and in 2020; also from solar and wind turbines in 2015-2050 and in 2021-2050 for old and new section respectively. The energy production from solid recovered fuel consists 2/3 of total energetic scenario potential. |
