Organic fertilizer composting process can be divided into 5 categories

According to different classification conditions, compost is divided into the following 5 categories:

  1. According to the oxygen demand of microorganisms, it is divided into aerobic composting and anaerobic composting. Aerobic composting is a biochemical process that relies on the action of obligate and facultative aerobic microorganisms to degrade organic matter, with fast decomposition speed and short cycle. Anaerobic composting is a process in which organic matter is degraded by the action of obligate and facultative anaerobic microorganisms, and its decomposition rate is slow and the fermentation period is long. Most of the currently used composting is aerobic.
  2. According to the temperature requirements, it is divided into medium temperature compost and high temperature compost. The fermentation temperature of mesophilic compost is 14~45℃, which cannot achieve the purpose of harmlessness, and this method is rarely used at present. The fermentation temperature of high temperature composting is 50-65 ℃, and the highest can reach 80-90 ℃, which is the most widely used fermentation method.
  3. According to the form of material movement in the composting process, it is divided into static composting and dynamic composting. After the static compost pile is built, it will not be overturned until the compost is fully decomposed and transported out. Dynamic composting adopts continuous or intermittent feeding or discharging dynamic mechanical composting method, and the fermentation efficiency is high.
  4. According to the composting method, it is divided into strip-type composting and trough-type composting. Strip-type composting is that the materials are piled into strips for fermentation in an open site, and the crawler-type mechanical turning machine is used to turn the pile. In trough composting, the materials are put into a fixed tank and closed, and the top track type turning machine is used to turn the pile.
  5. According to the fermentation process, it is divided into primary fermentation and secondary fermentation. A fermentation starts from the fermentation, goes through a medium temperature period, a high temperature period and then a cooling period. Secondary fermentation is that after primary fermentation, most of the easily degradable organic matter in the compost material has been degraded by microorganisms, but there are still some easily degradable and a large amount of refractory organic matter, which needs to be further fermented to turn it into humus. Relatively stable organic matter such as acid and amino acid can be decomposed.