be empirically determined by one of skill in the art in general the flocculant polymer dose is from about 100 ppm to about 600 ppm preferably from about 200 to about 600 ppm based on polymer solids per dry ton solids in another preferred aspect one or more coagulants are added to the sludge after the enzyme treatment water soluble coagulants are well known and commercially available many water soluble coagulants are formed by condensation polymerization examples of polymers of this type include epichlorohydrin dimethylamine and epichlorohydrin dimethylamine ammonia polymers additional coagulants include polymers of ethylene dichloride and ammonia or ethylene dichloride and dimethylamine with or without the addition of ammonia condensation polymers of multifunctional amines such as diethylenetriamine tetraethylenepentamine hexamethylenediamine and the like with ethylenedichloride and polymers made by condensation reactions such as melamine formaldehyde resins additional coagulants include cationically charged vinyl addition polymers such as polymers and copolymers of diallyldimethylammonium chloride dimethylaminoethylmethacrylate dimethylaminomethylmethacrylate methyl chloride quaternary salt methacrylamidopropyltrimethylammonium chloride methacryloxyloxyethyl trimethyl ammonium chloride diallylmethyl beta propionamido ammonium chloride beta methacryloxyloxyethyl trimethyl ammonium methylsulfate quaternized polyvinyllactam dimethylamino ethylacrylate and its quaternary ammonium salts and acrylamide or methacrylamide which has been reacted to produce the mannich or quaternary mannich derivative the molecular weights of these cationic polymers both vinyl addition and condensation range from as low as several hundred to as high as one million preferably the molecular weight range should be from about 20 000 to about 1 000 000 in a preferred aspect of this invention the sludge is selected from the.