Özet:

The amount of animal waste resulting from the increase in animal husbandry in our country and in the world has become one of the most important sources of environmental pollution. The use of animal organic wastes in biogas production is an efficient waste management step in waste disposal and energy recovery from waste. In this study, biogas and methane (CH4) yield of cattle manure as a result of anaerobic digestion (AD) in batch reactors under mesophilic conditions were investigated. Then, thermal pretreatments were applied to the AD residue in batch reactors at 60 °C, 80 °C, 100 °C and 120 °C for 4 hours. While the CH4 yield of untreated cattle manure was 203.5 mL/g volatile solids (VS), the cumulative CH4 yield of 120 °C thermal pretreated cattle manure was determined as 251.7 mL/g VS. Thanks to thermal pre-treatments, the CH4 yield per unit mass of cattle manure was increased by a maximum of 23.6% cumulatively. The dissolution efficiency of lignocellulosic components (cellulose, hemicellulose and lignin) with thermal pretreatments were investigated. At the same time, at the end of the whole anaerobic process, the total chemical oxygen needs and the removal efficiency of VS amounts were determined. The findings of the study can be used for large-scale biogas plants producing in Turkey.

Anahtar Kelimeler: