NOVELTY - A process (P1) of converting biomass into renewable fuel involves providing biomass comprising at least 10% water; slurrying by performing at least one of the steps of grinding and adding at least one of fresh water, recycled water and/or steam to form pumpable slurry; applying pressure to maintain liquidity and form pressurized biomass; heating pressurized biomass to first temperature; depressurizing biomass char slurry; separating carbon dioxide from char slurry; and removing portion of free water from slurry to provide dewatered biomass char product having decreased oxygen content.    USE - For converting biomass into renewable fuel, where biomass comprises sewage sludge; for converting slurry of a combination of at least one of biosolids and low-rank fossil fuels into combustible fuel; for converting treated sewage sludge comprising biosolids including cell-bound water into a product having a positive fuel value (claimed); and for treating municipal sewage and storm water containing biosolids to discharge standards, biosolids, even after dewatering. The biomass is used as renewable energy source.    ADVANTAGE - In the method, the raw biosolids are heated following their discharge from the sewage treatment plant to rupture the cells, thereby releasing the large quantities of cell-bound water. The temperature is high so that the cell structure is destroyed and carbon dioxide is split off to lower the oxygen content of the biosolids. This results in the formation of char that is not hydrophilic and can be efficiently dewatered and/or dried. This char is a viable renewable fuel. Using the method it is possible to increase the availability of renewable fuels by converting biomass (such as untreated yard and crop waste) in the same or parallel facilities. Similarly, non-renewable hydrophilic fuels can be so processed to further augment the energy that can be extracted from biosolids. The method is economically and ecologically viable. The method provides environmentally acceptable disposition of biosolids as well as energy for various energy consumers such as cement kilns and electric power plants. The method allows disposal of sludge generated at sewage and wastewater treatment plants in an economical and environmentally benign manner. The method is economically benign because the end product is ash that is free of odors, as well as harmful substances such as viruses or pathogens, and the ash has a small volume and is readily disposed of. The method is further economically viable because at the front end it benefits from the willingness of treatment plant operators to pay a tipping fee in order to dispose of the difficult-to-handle sewage sludge, and further because, at the other end of the cycle, the sludge will have been converted into a fuel with a positive heating value that can be used to generate further revenue or other items of value in the form of payments for the generated heat energy or e.g. trading the extracted heat for credits, desired products.    DETAILED DESCRIPTION - A process (P1) of converting biomass into a renewable fuel involves: providing biomass comprising at least about 10% water; slurrying the biomass by performing at least one of the steps of grinding and adding at least one of fresh water, recycled water and/or steam to form a pumpable slurry; applying pressure to the biomass slurry to maintain liquidity and form pressurized biomass; heating the pressurized biomass to a first temperature, where the first temperature is sufficient to form an aqueous char slurry, carbon dioxide, and free water; depressurizing the biomass char slurry; separating the carbon dioxide from the biomass char slurry; and removing at least a portion of the free water from the biomass char slurry to provide a dewatered biomass char product containing a decreased oxygen content. INDEPENDENT CLAIMS are included for the following:    (1) a process (P2) of converting slurry of a combination of at least one of biosolids and low-rank fossil fuels into a combustible fuel involving: providing biosolids comprising at least about 10% water; providing low-rank fossil fuel; mixing the biosolids and low-rank fossil fuel to form a feed slurry; applying pressure to the feed slurry to maintain liquidity and form pressurized feed slurry; heating the pressurized feed slurry to a temperature for cell rupture to form an aqueous char slurry comprising carbon dioxide and free water; depressurizing the aqueous char slurry; separating the carbon dioxide from the aqueous char slurry; and removing at least a portion of the free water from the aqueous char slurry to provide a dewatered char product; and    (2) a method (P3) of converting treated sewage sludge comprising biosolids including cell-bound water into a product having a positive fuel value involving: rupturing the biosolids cells to free the water bound in it; subjecting the ruptured biosolids cells to a temperature to convert the ruptured biosolids cells into char; removing at least a portion of the water from the slurry to form a char product adapted to be combusted at an elevated temperature; and providing heat energy from the char product.