Granular sludge is a preferable inoculum for the biochemical methane potential assay for two complex substrates

Area of Science:

• Biotechnology
• Environmental Science
• Waste Management

Background:

• The biochemical methane potential (BMP) assay is crucial for assessing organic waste biodegradability.
• Standardization of the BMP protocol is needed for reliable substrate comparisons.
• Inoculum selection is a key variable affecting BMP assay outcomes.

Purpose of the Study:

• To investigate the impact of different inocula on biomethane potential.
• To compare the performance of granular sludge versus suspended biomass as inocula.
• To evaluate the effect of substrate acclimation and co-inoculation on BMP results.

Main Methods:

• Biochemical methane potential (BMP) tests were conducted.
• Two distinct organic substrates were used.
• Inocula were sourced from four different anaerobic digesters, including granular sludge and suspended biomass.

Main Results:

• Granular sludge inocula consistently produced higher biomethane potential.
• Granular sludge exhibited faster anaerobic digestion kinetics compared to suspended biomass.
• Substrate acclimation and co-inoculation showed minimal impact on degradation rates.

Conclusions:

• Granular sludge is recommended as a superior inoculum for BMP assays.
• Inoculum type significantly influences biomethane potential and degradation kinetics.
• Standardizing inoculum selection, particularly favoring granular sludge, enhances BMP assay reliability.