Solid state anaerobic digestion of water poor feedstock for methane yield: an overview of process characteristics and challenges

Abstract

Solid state anaerobic digestion (SSAD) of water poor feedstock may be a promising technology for energy recovery. Feedstocks having high solid concentration like lignocellulosic biomass, crop residues, forestry waste and organic fraction of municipal waste may be the appropriate feedstock for its biochemical conversion into energy carries like biomethane through SSAD.Compared to liquid state anaerobic digestion (LSAD), SSAD can handle higher organic loading rates (OLR), requires a less water and smaller reactor volume, may have lower energy demand for heating or stirring and higher volumetric methane productivity. Besides these, pathogen inactivation may also be achieved in SSAD of biodegradable waste. Around 60% of recently built AD systems have adopted SSAD technology. However, the process stability of an SSAD system may have several constraints like limited mass transfer, process inhibitors and selection of digester type and should be addressed prior to the implementation of SSAD technology. In this article, a comprehensive overview of the key aspects influencing the performance of SSAD

A Review on Dry Anaerobic Digestion: Existing Technologies, Performance Factors, Challenges, and Recommendations

“…These include a lack of stability and reliability, which necessitates careful monitoring and precise operational controls. Additionally, the process requires a significant amount of energy for heating [76,77]. Dry thermophilic digestion is generally considered to be superior in efficiency compared to mesophilic digestion when it comes to methane production and organic compound degradation.…”