NOVELTY - Biomass comprising integrated feedstocks is treated by adding alternative feedstream(s) to the biomass to produce an integrated feedstock; contacting the integrated feedstock with an aqueous solution comprising ammonia to form an integrated feedstock-aqueous ammonia mixture, to produce a pretreated integrated feedstock product; and contacting the pretreated integrated feedstock product with a saccharification enzyme consortium under suitable conditions to produce a fermentable sugar product.    USE - The inventive method is used for treating biomass comprising integrated feedstocks.    ADVANTAGE - The inventive method provides an economically robust process that incorporates use of integrated biomass feedstreams. It achieves economic viability. It also provides high yields of sugars at high concentrations, using low amounts of chemicals. It produces a source of fermentable sugars with low toxicity toward fermentative organisms that convert sugars to value-added chemicals and fuels. It addresses ways to incorporate the integrated feedstreams into economically robust processes that meet the needed criteria for the production of value-added chemicals and fuels.    DETAILED DESCRIPTION - Treatment of biomass comprising integrated feedstocks includes:    (A) adding alternative feedstream(s) to the biomass to produce an integrated feedstock;    (B) contacting the integrated feedstock with an aqueous solution comprising ammonia to form an integrated feedstock-aqueous ammonia mixture, where the ammonia is present at a concentration at least adequate to maintain alkaline pH of the integrated feedstock-aqueous ammonia mixture, where the ammonia is present at less than 12 wt. % relative to dry weight of the integrated feedstock, and where the dry weight of the integrated feedstock is at a high solids concentration of greater than or equal to15 wt. % relative to the weight of the integrated feedstock-aqueous ammonia mixture, to produce a pretreated integrated feedstock product; and    (C) contacting the pretreated integrated feedstock product with a saccharification enzyme consortium under suitable conditions to produce a fermentable sugar product.