Preview Book

3.2.2 Biogas Lagada

Biogas Lagada SA is a power generation plant (power 1 MW) from the biogas combustion, which is produced by the anaerobic digestion of organic raw materials. The majority of the raw materials consist of farm waste such as liquid and solid cattle and poultry manure. As raw materials are also used cheese, whey waste and mill waste. Additionally, but in a smaller rate the AD uses, as a resource, silage from various crops such as corn, wheat, rye, etc.

All the above mentioned raw materials are stored in digestion tanks with the appropriate conditions and the required quantity. This digestion tank, within a suitable temperature conditions and with the absence of air, produces the required amount of biogas for the continuous operation of the biogas combustion engine, which operates the power generator. Besides electricity, the whole process produces heat, which is used to cover the heating needs of digestion tanks. The digestate of anaerobic digestion is stored in tanks and used as fertilizer in agricultural crops in the region.

At a daily bases 240 tons of waste are collected and treated. Otherwise all these produced livestock waste would end up at agricultural crops without following the quality standards, as the digestate derived from the AD plant. The dairy and mill waste would have been illegally disposed in a natural recipient or in a wastewater treatment plant creating further treatment costs. Additionally the AD plant constitutes the only RES technologies with negative CO2 balance.

The construction and operation of AD plants bring a great environmental benefit and contributes to the implementation of CE goals. It is of great importance that the licensing process is simplified in order to give motives for the construction and operation of new AD plants31.