NOVELTY - A system (10) for treatment of organic substrates comprises pretreatment station (16) that conditions organic substrate for anaerobic digestion; digestion station (26) flow coupled to the pretreatment station and that anaerobically digests organic substrate into biogas and effluent; and desulfurizer station (34) flow coupled to digestion station that reduces sulfur content within the biogas output by digestion station.    USE - For treatment of organic substrate used to produce biogas from animal waste and produce biogas from crop residue, whey, sewage and wastewater. The desulfurizer system used to clean raw biogas that originates from landfills or wastewater treatment plants.    ADVANTAGE - The substrate treatment system to produces more energy than is required to carry out anaerobic digestion and biogas desulfurizing. The system includes desulfurizer system for cleaning raw biogas that is produced during anaerobic digestion of organic substrate. The sulfur removal process exposes raw biogas to microorganisms, e.g. Thiobacillus denitrificans. Such microorganisms convert sulfide into free elementary sulfur in a moderately oxidized environment. The microorganisms living on the media interact with the biogas to convert hydrogen sulfide to sulfur. The sulfur is washed down from media by the countercurrent liquid stream. The organic substrate treatment system tailored, and adjusted as needed, to obtain optimized efficiency in terms of anaerobic degradation, retention time, and biogas yields whether for single organic substrate, e.g., manure, or composition of organic substrates, e.g., manure, whey, silage, etc. It treats organic substrate prior to its anaerobic digestion to maximize its degradation and subsequent biogas formation during digestion process. The system breaks down organic substrate into nutrient-rich effluent that is used as fertilizer and produces biogas that is used as heat energy or converted to electricity.    DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for the following:    (1) biogas production apparatus for producing biogas from anaerobic digestion of organic substrate, comprising dosing unit that add additives to organic substrate to enhance the anaerobic digestion of organic substrate; number of biogas plants interconnected that carry out sequential degradation of plug of organic material to provide raw biogas; and biogas cleansing unit to which the raw biogas from biogas plants is fed, where biogas cleansing unit provides decrease in sulfur dioxide content of raw biogas; and    (2) biogas production from organic material involving thickening the organic material into fluidized slurry; adding at least one of nickel, cobalt, and zinc to fluidized slurry; adding chemical salts to fluidized slurry for reducing surface tension of fluidized slurry; passing the fluidized slurry through filter containing microorganisms that interact with fluidized slurry to form at least volatile fatty acids; converting the volatile fatty acids to biogas; and capturing biogas.    INSTRUMENTATION AND TESTING - Preferred Apparatus: The biogas cleansing unit includes reactor containing packed media supporting microorganisms that convert sulfur dioxide in the raw biogas to elementary sulfur. The each biogas plant contains bio-block of immobilized media containing bacteria that convert organic substrate to biogas and effluent, where each bio-block includes a set of vertically oriented members formed of diamond mesh material. The members have an annular cross-section and additionally uniform diameter. The dosing unit further adds chemical salts to the organic substrate to reduce surface tension of organic substrate. The apparatus further comprises at least one of pressure sterilization unit for pre-digestion treatment of category 2 organics and pasteurization unit for pre-digestion treatment of category 8 organics. Preferred System: The digestion station includes number of tubular structures containing bacteria that anaerobically digest the organic substrate. The number of tubular structures includes vertically oriented tubes having walls formed of meshed material. The meshed material has mesh pattern. The pretreatment station includes dosing unit that adds digestion enhancer to organic substrate prior to its anaerobic digestion. The digestion station includes number of reactor tanks interconnected in series, where each of tanks containing at least one block of immobilization media supporting biofilm. The number of reactor tanks provides sequential degradation of organic substrate. The desulfurizer station includes reactor tank containing bacteria that interact with biogas supplied to convert sulfur dioxide in the biogas to sulfur. The pretreatment station includes grinding assembly configured to cut fibrous material contained within organic substrate. The digestion station is configured to convert organic substrate to biogas in less than four days. BIOLOGY - Preferred Method: The method additionally involves reducing sulfur dioxide levels in biogas. In the method, the passing step involves cascading fluidized slurry through number of filter connected in series. INORGANIC CHEMISTRY - Preferred Components: The digestion enhancers include at least one of nickel, cobalt, and zinc. The dosing unit adds at least one of nickel, cobalt, and zinc to the organic substrate.    DESCRIPTION OF DRAWING(S) - The figure shows block diagram of a substrate treatment system.    Substrate treatment system (10)    Barn (12)    Storage tank (14, 36)    Pretreatment station (16)    Separation tank (18)    Heat exchanger (20)    Biogas boiler (22)    Pump (24)    Digestion station (26)    Biogas collector (28)    Effluent collector (30)    Desulfurizer station (34)    Composting station (38)