NOVELTY - Thermal processing of clarified sludge (S1) involves thermally cracking and fluidizing a mixture (M) of the sludge and biomass (S2); further cracking the fluidized mixture in a mixing pump (24); gasifying the reaction mixture (N) in an intermediate vessel (31); cooling the gasified components (D) to produce a fuel (K); recycling the residual liquid component (R) to the cracking stage; and collecting and periodically removing settled residues (A).    USE - For converting clarified sludge, together with biomass from biological waste (e.g. rape, wood, sugar beet, brewing, papermaking or animal feed residues), into fuel by thermal cracking. The fuel is specifically used for electricity generation (claimed). In particular the fuel is converted using a turbine generator into electricity supply into a public grid network and the turbine exhaust gas is utilized to supply heat for the cracking stage (claimed).    ADVANTAGE - An inexpensive, environmentally friendly waste utilization process is provided. The equipment used is also inexpensive.    DETAILED DESCRIPTION - A thermal processing method for clarified sludge involves (S1) involves:    (A) combining the sludge with biomass (S2);    (B) heating the mixture (M) to a cracking temperature (T) (specifically 250-380degrees C) to cause fluidization and cracking reaction;    (C) subjecting the fluidized mixture to further cracking reaction in a mixing pump (24);    (D) gasifying the reaction mixture (N) in an intermediate vessel (31); cooling the gasified components (D) and processing to give a fuel (K); and recycling the non-gasifier liquid components (R) to the cracking stage; and    (E) collecting and periodically removing the residues (A) settling in the intermediate vessel.    An INDEPENDENT CLAIM is included for apparatus for carrying out the process, comprising first and second vessels (2, 10) for receiving the clarified sludge (S1) and biomass (S2) respectively; a mixing site (18) for the sludge and biomass; a production vessel (20) for heating the mixture (M) to the cracking reaction temperature; a mixing pump (24) for delivering the fluidized reaction mixture and continuing the cracking reaction; an intermediate vessel (32); a distillation column (30); a forwarding line (26) leading from the pump outlet to a gasifier (28), within the intermediate vessel; a recycling line (34), leading from the intermediate vessel to the production vessel for recycling the non-gasified components (R); and a condenser (38), connected to the head of the column, for cooling the gasified vapor components (D) and providing a fuel (K) at the outlet.    DESCRIPTION OF DRAWING(S) - The figure shows a schematic diagram of one form of the clarified sludge processing apparatus, in which fuel obtained    First and second receiving vessels (2, 10)    Inlets (4, 12)    Dosing valves (6, 14)    Nitrogen cushions (8, 16)    Mixing site (18)    Production vessel (20)    Heater (22)    Mixing pump (24)    Forwarding line (26)    Gasifier (28)    Distillation column (30)    Intermediate vessel (31)    Output vessel (32)    Recycling line to reaction process (34)    Distillate line (36)    Condenser (38)    Cooling water supply line (40)    Cooling water abstraction line (42)    Cooler (44)    Fuel line (46)    Fuel dewatering device (48)    Storage tank (50)    Fuel outlet line (52)    Turbine (54)    Electrical generator (56)    Exhaust gas line (58)    Heat exchanger (60)    Outlet lines (62)    Temperature regulator (64)    Oil forwarding line (66)    Oil recycling line (68)    By-pass line (70)    Outlet line (72)    Public grid (74)    Clarified sludge (S1)    Biomass (S2)    Mixture (M)    Reaction mixture (N)    Cracking temperature (T)    Organic vapor (D)    Liquid residue (R)    Precipitated residue (A)    Fuel (K)    Turbine exhaust gas (G)    Heating oil (P)