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

Abstract

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.

Description

Technical field: [0001] The invention relates to the technical field of environmental protection, in particular to a device and method for producing biogas and liquid organic fertilizer by using fruit and vegetable waste in a collection and distribution center. Background technique: [0002] In recent years, due to the adjustment of industrial structure, the intensive cultivation of fruits and vegetables has developed rapidly. According to statistics, China produces as much as 100 million tons of fruit and vegetable waste every year, most of which are discarded without resource utilization, causing serious waste of resources and environmental pollution. Due to the high moisture content and low calorific value of fruit and vegetable waste, it is not suitable to use incineration to treat them; to use sanitary landfill method, although the reduction can be achieved, but due to the generated CH 4 , CO 2 Greenhouse gases such as greenhouse gases are not easy to control and coll...

AI Technical Summary

Problems solved by technology

In practice, the above-mentioned impurities have a great impact on anaerobic digestion. For example, the sand contained in the impurities will block the outlet of the reactor, and foam plastics and soft plastics will float in the reactor due to their low density. Liquid level, it is difficult to discharge through the discharge, causing it to accumulate in the reactor, resulting in a decrease in the effective volume of the reactor

The soft plastic will also wrap the stirring paddle, resulting in a decrease in stirring efficiency and uneven mixing of the material and liquid

If these impurities are manually sorted, it will take a lot of manpower and material resources, and because the volume of impurities is small, it will easily lead to incomplete sorting and low sorting efficiency.

If water separation technology is used, since fruit and vegetable waste contains a large number of raw materials with low density, such as corn leaves, corn stalks, vegetable leaves, fruit peels, etc., the density is not much different from that of plastic substances contained in sundries, so it cannot be realized. effective sorting

Images