NOVELTY - Bioreactor comprises several bacteria (B1) containing aquatic anaerobic bacteria, and several bacteria (B2) containing ruminant anaerobic bacteria.    USE - The bioreactor is useful for converting cellulose-containing feedstock into products such as electricity, biofuel (all claimed), green crude, biogas, fatty acid, ammonia and chemical products.    ADVANTAGE - The bioreactor is inexpensive.    DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for the following:    (1) bioreactor system comprising several B1 containing bacteria in acidogenic state in a first bioreactor, and several B2 containing bacteria in acetogenic state, where the first and second bioreactors are in fluidic communication, and the bioreactor system is configured to remove of volatile fatty acids and ammonia produced in the system at a ratio to maintain pH of the bioreactor system (5.9-8.4);    (2) method of collecting products from cellulose-containing feedstock comprising, involves delivering the cellulose-containing feedstock to a bioreactor, where the bioreactor comprises several anaerobic bacteria, converting the cellulose-containing feedstock to usable products within the bioreactor, where the usable products include at least one of ammonia, volatile fatty acids and methane, and collecting the usable products from the bioreactor, where 59% or greater of cellulose-containing feedstock is converted into usable products;    (3) system for converting cellulose-containing feedstock into products, comprises first vessel comprising an input, more than one output, first anaerobic microorganism, and cellulose-containing feedstock, where the first anaerobic microorganism digests the cellulose-containing feedstock to generate an organic acid product and a partially-digested feedstock, first separator in fluid communication with one of the outputs of the first vessel, where the first separator obtains the organic acid product, second vessel comprising an input, more than one output, and second anaerobic microorganism, where the input receives the partially-digested feedstock, and the second anaerobic microorganism digests the partially-digested feedstock to generate a methane product and an ammonia product, and second separator in fluid communication with one of the outputs of the second vessel, where the second separator obtains the ammonia product; and    (4) method of converting cellulose-containing feedstock into products, involves anaerobically digesting or breaking down the cellulose-containing feedstock in first anaerobic digestion vessel to produce an organic acid product and a partially-digested feedstock, separating the organic acid product from the partially-digested feedstock, transferring the partially-digested feedstock to second anaerobic digestion vessel, anaerobically digesting or breaking down the partially-digested feedstock in the second anaerobic digestion vessel to produce an ammonia product and a methane product, and removing the ammonia product and the methane product from the second anaerobic digestion vessel.