NOVELTY - Processing of organic material employs two reactors and involves performing a bioconversion on the organic material in the first reactor (9), treating the biogas formed in the bioconversion with ammonia in the second reactor (10), and recycling buffer solution formed in the second reactor to the first reactor.    USE - The method is used for processing organic material to produce a hydrolyzed product for use as a soil conditioner, a fertilizer, or a fertilizer-like substance; or to produce a cleaned biogas for use as a greenhouse gas, for heating, for electricity production, or as fuel (All claimed).    ADVANTAGE - The invention enables larger amounts of solid matter to be introduced into the bioconversion. Microbiologically active waste can be stored in an optimal state in view of methane yield, and the hygienic level complies with the EU (sic) directives, without thermal manipulation. It enables reintroduction of a buffer solution and/or buffer-solution-containing organic material to be processed into the hydrolysis reactors, which have interrupted their process due to excessive ammonia content. The invention makes it possible to preserve the organic material longer than before, which facilitates the storage. The formed ammonia does no longer prevent the processing, but a long storage time pre-processes the waste. The method produces a hydrolysis product and biogas, which are recovered and which can be reused. The biogas produced by the invention contains less carbon dioxide than the biogas produced by the conventional methods, and thus is environmentally friendly. The inventive method provides optimal conditions for the microbes to function, because the formed buffer compound prevents variations in the pH in the hydrolysis reactor.    DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for an equipment for processing organic material, which comprises at least one first reactor, at least one second reactor, a pipe (12) for transferring the organic material to be processed from the first reactor to the second reactor, a pipe (14) for transferring biogas from the first reactor to the second reactor, a pipe (15) for recycling buffer-compound-containing material from the second reactor back to the first reactor.    DESCRIPTION OF DRAWING(S) - The figure shows equipment for implementing the invention.    First reactor (9)    Second reactor (10)    Pipes (12, 14, 15)