Development of lignocellulosic biorefineries for the sustainable production of biofuels: Towards circular bioeconomy

[Display omitted] •Development of biorefineries leads to eco-friendly production of bioenergy.•Green pretreatment approaches for lignocellulosic biomass are required.•Bioengineering and immobilization techniques develop effective biocatalyst systems.•Machine learning models present possibilities in bioenergy prediction.•LCA is used to evaluate the supply chain for a biorefinery's environmental effect. The idea of environment friendly and affordable renewable energy resources has prompted the industry to focus on the set up of biorefineries for sustainable bioeconomy. Lignocellulosic biomass (LCB) is considered as an abundantly available renewable feedstock for the production of biofuels which can potentially reduce the dependence on petrochemical refineries. By utilizing various conversion technologies, an integrated biorefinery platform of LCB can be created, embracing the idea of the ‘circular bioeconomy’. The development of effective pretreatment methods and biocatalytic systems by various bioengineering and machine learning approaches could reduce the bioprocessing costs, thereby making biomass-based biorefinery more sustainable. This review summarizes the development and advances in the lignocellulosic biorefineries from the LCB to the final product stage using various different state-of-the-art approaches for the progress of circular bioeconomy. The life cycle assessment which generates knowledge on the environmental impacts related to biofuel production chains is also summarized.