| 摘要 |
<p>The invention concerns a method of treating in particular household refuse wherein, after conventional preparative measures such as selection, comminution, etc., the fraction of the total refuse containing biodegradable organic dry matter is delivered to an anaerobic fermentation process. Anaerobic fermentation is carried out until all the dry matter is exhausted, degradation rates of the biodegradable organic dry matter (OTSbiol) of 70 % and more being attained. The resultant fermentation residue (34) is subjected to a drying process (9) in which the dry matter portion is increased to at least 90 %. The resultant dry material no longer exhibits any biological activity. The exhaustive anaerobic fermentation process enables a maximum amount of biogas to be produced, its energy content inter alia being sufficient to supply the drying process. As a result of extensive drying, a higher mass reduction is attained than was hitherto possible. A further aspect of the reduction of the problematic refuse portion is the separation of a finegrained fraction (particle size < 15 to 40 mm) (22) which is purified to such an extent of adherent material, in particular organic dry matter, by counterflow washing in a washing unit (39) that inert material with an organic dry matter portion of at most 5 % is produced. In this respect, washing can be carried out using the condensate (36) such that a closed water circuit results.</p> |
