NOVELTY - The method for treating integrated wastes and polar fats/oils/greases/waxes (FOG) wastes, comprises circulating actively digesting sludge in a slipstream loop at a rate for precluding solid settlement accumulation as a flowable slurry from a base of an anaerobic waste water digester system and circulating the sludge back to the digester system, warming the digesting sludge to soften polar FOG wastes for desired sewage treatment temperature range, and pumping a set volume (V1) of the warmed digesting sludge from the slipstream loop through a rock trap and a delivery/input line piping.    USE - The method is useful for treating integrated wastes and polar fats/oils/greases/waxes wastes (claimed).    ADVANTAGE - The method ensures simple and economic treatment of the wastes by the waste treatment system, which is simple to operate and maintain and is easily amenable to automatic operation.    DETAILED DESCRIPTION - The method for treating integrated wastes and polar fats/oils/greases/waxes (FOG) wastes, comprises circulating actively digesting sludge in a slipstream loop at a rate for precluding solid settlement accumulation as a flowable slurry from a base of an anaerobic waste water digester system and circulating the sludge back to the digester system, warming the digesting sludge to soften polar FOG wastes for desired sewage treatment temperature range, pumping a set volume (V1) of the warmed digesting sludge from the slipstream loop through a rock trap and a delivery/input line piping into a closed and vented receiving/conditioning holding tank (5) for partial filling, connecting a hauler tank containing a volume (V(H)) of FOG wastes via an offloading hose to the rock trap, pumping the (V(H)) from the hauler tank through the rock trap and the delivery/input piping into the holding tank, pumping a second volume (V2) of the warmed digesting sludge from the slipstream loop via the rock trap and delivery/input piping into the holding tank, mixing the warmed digesting sludge with the FOG wastes in the holding tank for liquefying, hydrolyzing and decreasing solid particle size of the FOG wastes and for allowing acidogens in the actively digesting sludge to pre-digest such wastes producing volatile fatty acids, biogas and a highly bio-reactive flowable feedstock slurry from the FOG wastes and actively digesting sludge, injecting the flowable feedstock slurry from the holding tank into slipstream loop at a metered rate for circulating the warmed digesting sludge slurry, and introducing the feed stock slurry with the warmed digesting sludge slurry in the slipstream loop together with raw digestible wastes at the head of the anaerobic digester system for solid digestion and steady-state methane production. The (V1), (V (H)) and (V2) have a pre-selected relationship, and a total of (V1), (V (H)) and (V2) is less than a volume of the receiving/conditioning holding tank. INDEPENDENT CLAIMS are included for:    (1) a pre-treating method for polar fats/oils/greases/waxes wastes;    (2) an integrated digestible wastes and polar fats/oils/greases/waxes waste treatment system; and    (3) a polar fats/oils/greases/waxes waste treatment system.    DESCRIPTION OF DRAWING(S) - The diagram shows a labeled diagram of the integrated cogeneration system for treating raw sewage.    Circulation pump (1)    Heat exchanger (2)    Displacement pump (4)    Holding tank (5)    Rock separator. (8)