Device and method for preparing biological gas and liquid organic fertilizer from fruit and vegetable wastes of collecting and distributing center

The invention discloses a device and a method for preparing a biological gas and a liquid organic fertilizer from fruit and vegetable wastes of a collecting and distributing center. The method comprises the following steps: squeezing and crushing the fruit and vegetable wastes collected by a collecting and distributing center to obtain a crushed solid raw material and a liquid, and directly feeding the liquid into an anaerobic fermentation reactor for fermentation; feeding the crushed solid raw material into a rotatable hollowed-out cylindrical hydrolyzing device arranged in a hydrolyzing and desilting basin for hydrolyzing and desilting, thereby obtaining a hydrolysate; and then feeding the hydrolysate into the anaerobic fermentation reactor for fermentation to generate methane, and sterilizing the digestive fluid left after fermentation at a high temperature to obtain a liquid fertilizer. According to the method, the fermentation period is shortened, the fermentation efficiency of the raw material is improved, the problems of difficult sorting of small impurities, huge influence on the anaerobic fermentation process, difficult degradation of high-fiber content wastes and the like are overcome, the impurities are prevented from entering the anaerobic fermentation reactor, and the fruit and vegetable waste processing capability and the gas producing capability are improved; meanwhile, the high-quality liquid organic fertilizer is produced, the cost is reduced and the efficiency is improved.