Influence of Different Types of Substrate on the Anaerobic Fermentation Process

摘要

With the growing prices on fossil fuels and the negative impact that they have on the environment it can see the necessity to integrate renewable source energy for consumption. One of these that stand forward is biogas produced from anaerobic fermentation process. This type of energy diminishes the impact on the environment by reducing greenhouse gases and is useful for producing electrical and thermal energy. Anaerobe fermentation process is regarded as a good solution because of two aspects: producing energy and giving a solution to rising quantities of junk. Biomass used in order to obtain biogas can be formed from urban solid and liquid garbage, animal and vegetal mass dejections. In the case of animal dejections they are being mixed with energetic plants or agricultural residue. The processing is realized by anaerobic fermentation process. The mix used for producing biogas was formed from animal dejections (bovine and pork) with energetic plant grind (Miscanthus giganteus) with different dimensions. Production of biomass expressed after 22 days of anaerobic fermentation showed the influence of energetic plants on the process of anaerobic fermentation. The three recipes used in the present paper were composed out of bovine dejections and Miscanthus green leaves mix of different dimensions (between 2-9cm), production of biomass being recorded for each type of recipe being tested, and the percentages that compose the biogas were recorded (CH; % v/Wv, H2S % v/v and CO2 % v/v). Results showed that the largest production of biogas with highest concentration of methane was obtained for the recipe in which green leaves of Miscanthus with dimensions of 2 to 5 cm were added.