Effect of carbon fabric and magnetite addition on biogas and biomethane production from sewage sludge

In this thesis study, the effect of adding different concentrations of carbon fabric and magnetite (Fe3O4) to sewage sludge in batch reactors was investigated to increase biogas and biomethane production. The best yield was obtained with the S/I 1 gUK/gUK reactor. Various concentrations of carbon fabric and magnetite (Fe3O4) were added using the S/I 1 gUK/gUK loading rate. The highest biogas and biomethane productions were determined to be 447 mL biogas/gUK and 345 mL CH4/gUK, respectively, at a carbon fabric concentration of 2.5 g/L, 452 mL biogas/gUK and 356 mL CH4/gUK, respectively, at a magnetite concentration of 2 g/L, and 445 mL biogas/gUK and 355 mL CH4/gUK, respectively, at a carbon fabric + magnetite concentration of (10+2) g/L. The increase in the highest biogas and biomethane productions was determined to be 8.2% and 17.1%, respectively, at a carbon fabric concentration of 2.5 g/L, 9.4% and 20.8%, respectively, at a magnetite concentration of 2 g/L, and 7.7% and 20.5%, respectively, at a carbon fabric + magnetite concentration of (10+2) g/L. Biofilm samples were taken from the reactors with the best results in the addition of carbon fabric and Fe3O4 (magnetite) with the highest efficiency in terms of biogas and biomethane production, and as a result of the examination of their microbial distributions, W5, Blvii28, and Treponema were determined to be the dominant species. Key Words: Sewage sludge, carbon fabric, magnetite (Fe3O4), biogas production, biomethane production