NOVELTY - The method involves leaving fermentation residue (2) containing short chain fatty acids after regular collection of cross-loaded methane digester (1). The vapors of selected short-chain fatty acids such as acetic acid and/or propionic acid, are identified in gas mixture by digester while releasing the residue. The regeneration time sensor signals are used as quasi-continuous information about preventing overloads and unused capacity reserves of digester.    USE - Method for determining biotechnological burden of methane digesters for production of energy-rich fuel gas.    ADVANTAGE - The impact of biotechnology methane digesters is monitored and specifically controlled with little technical and economic effort. The digester capacity is utilized effectively, while avoiding difficult calculable risks, which can contribute to lower specific investment costs and at the same time to reduce the specific operating costs. The economic efficiency is improved, while avoiding polluting the environment disaster situations by exceeding the plant-specific biotechnological limit load.    DETAILED DESCRIPTION - The analysis results are compared with the determined maximum load of fermentation residue without converting to methane and carbon dioxide fatty potential by action recommendations to the required reduction, for possible increase of load fermenter with degradable organic feedstock. The benchmark for identification of plant-specific limit exposure to systematic increase in the methane digester daily intake of organic dry matter amount of biogenic feedstock is obtained to the significant change of the gas components methane and carbon dioxide in favor of the content of carbon dioxide. The concentration of methane in the digester is determined. An INDEPENDENT CLAIM is included for arrangement for determining biotechnological burden of methane digesters.    DESCRIPTION OF DRAWING(S) - The drawing shows a schematic view of the arrangement for determining biotechnological burden of methane digesters. (Drawing includes non-English language text)    Methane digester (1)    Fermentation reside (2)    Gas delivery line (4)    Mechanical impurities (5)    Feed pump (7)