NOVELTY - Converting biomass into renewable fuel comprises: providing biomass of at least 10% water; slurrying biomass by performing at least one of grinding and adding fresh water, recycled water and/or steam; applying pressure to the obtained biomass slurry to maintain liquidity; heating obtained pressurized biomass to first temperature to form an aqueous char slurry, carbon dioxide, and free water; depressurizing the slurry; separating carbon dioxide from slurry; and removing at least a portion of free water from slurry to provide dewatered biomass char product containing decreased oxygen content.    USE - The process is useful for converting biomass (comprising sewage sludge) into renewable fuel (claimed) for cement kilns and electric power plants.    ADVANTAGE - The process: increases the availability and environmental acceptability of renewable fuels, which is a low-cost, renewable fuel for many energy-consuming industries; reduces the moisture (water) content of waste going to landfill, to reduce disposal costs or to utilize for fertilizer; increases the softening point of renewable fuel ash to reduce fouling and slagging; converts a non-uniform solid fuel, such as agricultural and forestry waste and/or paper mill sludge, into a uniform fuel; converts a bulky fuel into a fuel that is compact and easy to store and transport; converts a perishable fuel into a sterile fuel that is storable without deterioration; provides an economical means of co-firing an otherwise non-compliant fuel; provides a thermally efficient combination of liquid deoxidation and at least one of a wastewater treatment plant, a cement kiln, and a thermal power station; co-processes multiple feedstocks utilizing fluid deoxidation; removes (and recovers) elements found in biosolids or other biomass such as phosphorus, chlorine or carbon dioxide; provides ash as end product that is free of odors and harmful substances such as viruses or pathogens, where the ash has a small volume and is readily disposed off; and reduces the need for primary fuels at thermal dryer for evaporating the water liberated from the biosolids.    DETAILED DESCRIPTION - INDEPENDENT CLAIMS are also included for:    (1) converting a slurry of a combination of at least one of biosolids and low-rank fossil fuels into a combustible fuel comprising providing biosolids comprising at least 10% water, providing low-rank fossil fuel, mixing the biosolids and low-rank fossil fuel to form a feed slurry, applying sufficient pressure to the feed slurry to maintain liquidity and form pressurized feed slurry, heating the pressurized feed slurry to a sufficient 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) converting treated sewage sludge containing biosolids including cell-bound water into a product having a positive fuel value comprising rupturing the biosolids cells to free the water bound in it, subjecting the ruptured biosolids cells to sufficient 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.    DESCRIPTION OF DRAWING(S) - The figure shows a schematic flow diagram illustrating the process of converting biosolids into a high energy density slurry or dry solid fuel as a renewable energy source.    Raw feed tank (106)    Pipeline (107)    Sludge pump (109)    Line (110)    Pumping device (111)