(DE4120808-A1)      In processing of waste material, before anaerobic fermentation of biogenic-organic components of the waste, esp. bio-waste, wet waste, residual waste and industrial waste, (a) in a pretreatment stage, an easily dewaterable suspension of the biogenic-organic material (I) is prepd. by mechanical processing with selective hydrolysis and disintegration of (I), controlling the effect of the mechanical flow force so that the non-biogenic-organic material (II) is not subjected to comminution forces before sepn. at the end of the pretreatment, so that (II) is sepd., and (b) the suspension is converted to biogas and a compost-like residue, in an anaerobic fermentation.    ADVANTAGE -   Sepn. of the dissolved organic cpds. and organic fibrous material from the material which cannot be utilised biotechnically is efficient. (II) is not damaged or comminuted mechanically, facilitating its sepn., and can easily be recycled and deposited. Abrasion by fine particles, e.g. of glass, is reduced. Heavy metals are not carried on into the compost-like residue. The process saves energy.    (US5377917-A)      Waste is treated by forming an easily dewaterable suspension of biogenic/organic substances in a vessel with a rotatable impeller, the forces generates dissolving and/or defibrating the substances. Impeller speed is controlled so that substances not suitable for anaerobic digestion are not appreciably disintegrated. The impeller pref. generates a toroidal or loop-shaped flow, and the suspension is removed through a sieve. Floating substances are pref. removed using a vertically-adjustable rake which can be removed from the vessel and tilted to discharge the substances.    USE/ADVANTAGE -   For processing domestic and commercial waste. Provides gently and high-efficiency separation with min. damage to e.g. glass computers.    (JP2000051821-A)      In processing of waste material, before anaerobic fermentation of biogenic-organic components of the waste, esp. bio-waste, wet waste, residual waste and industrial waste, (a) in a pretreatment stage, an easily dewaterable suspension of the biogenic-organic material (I) is prepd. by mechanical processing with selective hydrolysis and disintegration of (I), controlling the effect of the mechanical flow force so that the non-biogenic organic material (II) is not subjected to comminution forces before sepn. at the end of the pretreatment, so that (II) is sepd., and (b) the suspension is converted to biogas and a compost-like residue in an anaerobic fermentation.    ADVANTAGE -   Sepn. of the dissolved organic cpds. and organic fibrous material from the material which cannot be utilised biotechnically is efficient. (II) is not damaged or comminuted mechanically, facilitating its sepn., and can easily be recycled and deposited. Abrasion by fine particles e.g. of glass is reduced. Heavy metals are not carried on into the compost-like residue. The process saves energy    (JP3041136-B2)      In processing of waste material, before anaerobic fermentation of biogenic-organic components of the waste, esp. bio-waste, wet waste, residual waste and industrial waste, (a) in a pretreatment stage, an easily dewaterable suspension of the biogenic-organic material (I) is prepd. by mechanical processing with selective hydrolysis and disintegration of (I), controlling the effect of the mechanical flow force so that the non-biogenic organic material (II) is not subjected to comminution forces before sepn. at the end of the pretreatment, so that (II) is sepd., and (b) the suspension is converted to biogas and a compost-like residue in an anaerobic fermentation.    ADVANTAGE -   Sepn. of the dissolved organic cpds. and organic fibrous material from the material which cannot be utilised biotechnically is efficient. (II) is not damaged or comminuted mechanically, facilitating its sepn., and can easily be recycled and deposited. Abrasion by fine particles e.g. of glass is reduced. Heavy metals are not carried on into the compost-like residue. The process saves energy