The process ferments easily decomposable waste products and difficult to decompose waste products in the same arrangement. Independent claims are included for: (1) a process for the simultaneous fermentation of carbohydrate-, fat-, and protein-containing biological wastes, cellulose-rich biological wastes, sewage sludge from sewage systems and paper sludge and whey, comprising the following characteristics: (a) easy decomposable biological wastes and difficult decomposable wastes are mixed and churned with water in two separate vessel until they become suspensions with 10% TS (not defined) content, which are heated to 70 deg C with in-build heat-exchanger; after 1 hour the mixtures are cooled to 30-33 deg C; the difficult to decompose waste receives an enzyme suspension for aerobic hydrolysis (pH 6.0); after three days, the contents of the two vessels is mixed and undergoes an anaerobic hydrolysis and acidogenesis (pH 4.5-5.0); (b) after 3 days of anaerobe hydrolysis, the formed sediment is placed in an enzyme container and mixed with 10% paper sludge and 5% whey to obtain an aerobic enzyme hydrolysis mixture at pH 5.8; the enzyme mixture is added to the suspension comprising the difficult to decompose wastes; (c) The remaining liquid from the anaerobe hydrolysis is added at ratio 1:1 to the sewage sludge at methane temperature stage 35-37 deg C to initiate acetogenesis and methanogenesis at pH 6.8-7.2 for 15 days; the resulting methane gas is used to power a gas motor to generate heat or electricity; and (d) the heat is in the form of hot water which is used to heat the suspensions for sterilization, to raise the temperature for anaerobe hydrolysis or methane formation; and (2) an assembly to carry out the fermentation processes described above.
