Lignocellulolytic enzymes from Aspergillus allahabadii for efficient bioconversion of rice straw into fermentable sugars and biogas

•Comparative genome wide sequence analysis of Aspergillus strains.•Developing hyper lignocellulolytic strain of A. allahabadii.•Secretome profiling identifies up-regulated GH and transcriptional factor in mutant.•Enzyme cocktail of mutant MAN 40 and CBH from R. emersonii for efficient hydrolysis.•In situ addition of cellulase for valorization of waste lignin stream in biogas.