(DE4334435-A1)      The composting of organic matter by biological decomposition in a closed container supplied with air, in which at least part of the waste air is re-supplied to the matter, is controlled such that the relative humidity in the organic matter is maintained between upper and lower limits, pref. by cooling the waste air and condensing out at least part of its water vapour content. Also claimed are (i) a similar process in which the cooling power and/or the fan power are adjusted to produce a certain condensate amount per unit time; (ii) a process for determining the energy produced microbiologically by the composting process; (iii) processes for determining the amount of water produced microbiologically by the composting process; and (iv) a process for controlling and/or regulating the composting process.    ADVANTAGE -   The process allows trouble-free maintenance of the relative humidity required for microorganism activity.    (DE4345238-A1)      The composting of organic matter by biological decomposition in a closed container supplied with air, in which at least part of the waste air is re-supplied to the matter, is controlled such that the relative humidity in the organic matter is maintained between upper and lower limits, pref. by cooling the waste air and condensing out at least part of its water vapour content. Also claimed are (i) a similar process in which the cooling power and/or the fan power are adjusted to produce a certain condensate amount per unit time; (ii) a process for determining the energy produced microbiologically by the composting process; (iii) processes for determining the amount of water produced microbiologically by the composting process; and (iv) a process for controlling and/or regulating the composting process.    ADVANTAGE -   The process allows trouble-free maintenance of the relative humidity required for microorganism activity.    (DE4334435-C2)      Process for composting organic waste comprises aeration and biological degradation in a closed container and recycling at least some of the effluent gases (opt. with additional fresh air and/or oxygen), until at least part of the effluent becomes cooler and at least some water vapour condenses, such that the relative humidity of the waste gases falls to 0.65-0.85.    USE/ADVANTAGE -   The process is an efficient means of disposal of organic waste. The process is cheap, energy efficient and gives good quality compost.    (DE4345238-C2)      The composting of organic matter by biological decomposition in a closed container supplied with air, in which at least part of the waste air is re-supplied to the matter, is controlled such that the relative humidity in the organic matter is maintained between upper and lower limits, pref. by cooling the waste air and condensing out at least part of its water vapour content. Also claimed are (i) a similar process in which the cooling power and/or the fan power are adjusted to produce a certain condensate amount per unit time; (ii) a process for determining the energy produced microbiologically by the composting process; (iii) processes for determining the amount of water produced microbiologically by the composting process; and (iv) a process for controlling and/or regulating the composting process.    ADVANTAGE -   The process allows trouble-free maintenance of the relative humidity required for microorganism activity.    (EP647604-B1)      The composting of organic matter by biological decomposition in a closed container supplied with air, in which at least part of the waste air is re-supplied to the matter, is controlled such that the relative humidity in the organic matter is maintained between upper and lower limits, pref. by cooling the waste air and condensing out at least part of its water vapour content. Also claimed are (i) a similar process in which the cooling power and/or the fan power are adjusted to produce a certain condensate amount per unit time; (ii) a process for determining the energy produced microbiologically by the composting process; (iii) processes for determining the amount of water produced microbiologically by the composting process; and (iv) a process for controlling and/or regulating the composting process.    ADVANTAGE -   The process allows trouble-free maintenance of the relative humidity required for microorganism activity.