Method for preparing microbial compound organic fertilizer from domestic sludge

Abstract

The invention discloses a method for preparing a microbial compound organic fertilizer from domestic sludge. The method comprises the following steps: adding 80-150 parts of straws, 300-500 parts of sawdust, 30-60 parts of bean dregs, 20-30 parts of oil cakes and 30-60 parts of excrement residues into 650-800 parts of sludge; adding 4-7 parts of functional composite microbial strains, and uniformly stirring; carrying out static fermentation for 24-36 hours; carrying out high temperature overturning fermentation, wherein the temperature is kept at 60-70 DEG C, the water content is 48%-52%, and the mixture is turned over once every 12-24 h and is totally turned over for 7-10 times; carrying out low temperature overturning fermentation, wherein the temperature is kept at 35-50 DEG C, the water is reduced gradually by 2-4% each time, and the mixture is turned over once every 12-24 h and is totally turned over for 5-8 times; and drying and cooling the fermented material until the water content is lower than 30% to obtain the powdery microbial compound organic fertilizer. By adjusting the proportion of the domestic sludge, the organic waste and the functional microbial agent and controlling the fermentation mode, the fermentation temperature, the fermentation humidity and the fermentation time in the fermentation process, the prepared microbial compound organic fertilizer contains various functional bacteria and trace elements, the quality and the yield of crops, fruits, vegetables and tea can be remarkably improved, and the environment of the planting soil is conditioned and improved.

Description

technical field [0001] The invention relates to the technical field of microbial fertilizer and sludge resource utilization, in particular to a method for preparing microbial compound organic fertilizer by using domestic sludge. Background technique [0002] With the continuous advancement of urbanization, the amount of urban sewage treated by urban sewage treatment plants has increased significantly, and the ensuing problem is that the production of domestic sludge from sewage treatment plants has also gradually increased. The sludge produced in the process of urban sewage treatment is very unfavorable to the environment. Because the organic matter content in the sludge is high and it is easy to deteriorate, if it contains a large number of parasites and pathogens, if it cannot be treated effectively and in time, it will pollute the water source, air and soil again. The environment poses a hazard. Therefore, the disposal and resource utilization of sludge is one of the pro...

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Problems solved by technology

For example, Chinese patent CN103172415B discloses a method for producing Paenibacillus polymyxa microbial fertilizer from surplus sludge as a resource. The surplus sludge produced in the sewage treatment process is used as the main medium raw material, and the method of liquid fermentation is used to produce Paenibacillus polymyxa Bacillus microbial fertilizer; the microbial fertilizer produced by this method only includes one type of microbial strain, and the sludge needs to be selected from the remaining activated sludge of domestic sewage treatment plants whose heavy metal content does not exceed the agricultural standard, and the sludge needs to be heated by microwaves, which is a complicated process ,high cost

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