TECHNOLOGY FOCUS - ENVIRONMENT - Preferred Condition: The sludge suspension is at 20-90degreesC. It is subjected to agitation at 0-180 rpm. The sludge is pre-concentrated, prior to the addition of enzymes and bacteria, by gravitation or enhanced sedimentation to 10-300 g sludge solids per 1 L sludge suspension. The sludge suspension is subjected to a pre-treatment from acid treatment, base treatment, sonication, grinding or heating.    TECHNOLOGY FOCUS - BIOTECHNOLOGY - Preferred Component: The enzymes in the enzyme mixture are cellulases, cellobiases, amylases, lipases, pectinases, dextranses, oxidoreductases, proteases, pulpzymes and oxidases. The fermenting bacteria are acidogenic bacteria, acetogenic bacteria, or methane producing bacteria. They are Gluconobacter oxydans, Acetobacter species, Acetogenium kivui, Bacillus macerans, polymyxa, Bacillus coagulans, Lactobacillus buchneri, Clostridium thermoaceticus, Clostridium lentocellum, Clostridium formicoaceticu, Clostridium thermocellum or Pseudomonas species. Specie(s) of the fermenting bacteria is methane producing bacteria from Methanosarcina barkeri, Methanosarcina mazeii, Methanosarcina soehngenii, Methanosarcina acetivorans, and/or Methanosaeta. Preferred Composition: The dose of the enzyme mixture in relation to sludge suspension is 0.2-0.001%, preferably 0.06-0.001% enzyme per 1% dry solid weight (TS) sludge.    TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Component: The enzyme mixture may comprise a non-ionic surfactant (0.0025-5, preferably 0.0025-2 w/w%) from natural and synthetic alcohol ethoxylates, fatty alcohol ethoxylate (FAE), non-ionic surface active agents prepared by the addition of ethylene oxide to propylene glycols, polydimethylsiloxane co-polymers and polyoxyethylene derivatives of fatty acid partial esters of hexitol anhydrides.    TECHNOLOGY FOCUS - POLYMERS - Preferred Component: The natural polymeric materials are proteins, polysaccharides, polyphenols (lignins), fats, waxes, or mineral oils. EXAMPLE - Samples with a different TS (%) of sludge were treated with an enzyme mixture A containing enzyme cocktail, and then with an enzyme mixture B containing alcalase (2%). The enzyme cocktail was prepared from alcalase (2%), lipolase (2%), dextranase (2%), cellulast (2%), pulpzyme (2%), FAE (0.1%), xantan (0.2%), and water (91.5%). The enzyme mixture A was added at 0 hour directly after the adenosine triphosphate (ATP) measurement of the sludge suspension without any added enzyme mixture. The second measurement of ATP was made after 2 hours and before the addition of the second enzyme mixture B. A third ATP measurement was made after 4 hours and in one case after 8 hours. The results showed that the vitality of the existing bacteria present in the sludge was reduced almost completely during enzymatic treatment.