Co-digestion's perpective on biogas production from sewage sludge and food waste: a systematic review

This study investigates the potential of co-digesting sewage sludge and food waste for biogas production. Several options for renewable energy have been suggested, and one of them is the production of biogas using biomass. Biomass energy has been used in various applications due to its availability and environmental benefits. Co-digestion, which involves the mixing of two or more substrates, has been carried out to enhance the biogas production process. To evaluate the performance of anaerobic digestion, key parameters such as organic loading rate, potential of hydrogen, temperature, hydraulic retention time, and methane content were analyzed. The correlation between these variables was investigated using data from peer-reviewed articles published between 2010 and 2020. From these analyses, a positive correlation was identified between temperature and potential of hydrogen. Additionally, negative correlations were observed between organic loading rate and potential of hydrogen, temperature and organic loading rate, organic loading rate, and hydraulic retention time, as well as between organic loading rate and methane content, and potential of hydrogen and methane content. Principal component analysis was employed to assess the impact of operational variables on methane production. Our findings revealed that the key operational factors include hydraulic retention time, organic loading rate, and temperature. These findings provide valuable insights into the factors influencing biogas production from sewage sludge and food waste through anaerobic digestion and can be used to optimize the process. In conclusion, biomass energy has shown great potential for biogas production, and co-digestion has emerged as a promising strategy to enhance the process.