دراسة تجريبية لتأثير إضافة جسيمات الغرافيت النانوية على إنتاج الغاز الحيوي من الهضم المشترك اللاهوائي للمخلفات العضوية

Abstract

Biogas is considered a promising source of renewable energy, with its production influenced by various factors, including the addition of nanomaterials. This study aims to evaluate the effect of graphite addition on biogas production through the co-digestion process of cow manure and potato peels at a mixing ratio of 80:20. The experiments were conducted using locally manufactured chromium bioreactors, with graphite added at different concentrations (100, 200, 300, 500, and 750 mg/L).

The results showed a significant improvement in biogas production with the addition of graphite at concentrations of 100, 200, and 300 mg/L, with production increasing by 13.95%, 52.37%, and 27.42%, respectively, compared to the conventional process without nanocatalysts. Additionally, methane content increased by 19.24% and 73.23% at concentrations of 100 and 200 mg/L, respectively, while it decreased by 6.77% and 23.96% at concentrations of 300 and 500 mg/L. Conversely, using a high graphite concentration of 500 mg/L led to a 3.33% reduction in biogas production. Moreover, the use of 750 mg/L resulted in process instability and reactor failure due to an explosion on the first day. These results indicate that adding graphite at appropriate concentrations enhances biogas production and increases methane content, but high concentrations negatively affect the stability of the process.