Method for producing organic fertilizer by treating sludge by use of microbial technology

Abstract

The invention provides a method for producing an organic fertilizer by treating sludge by use of a microbial technology. The method comprises the following steps: 1) dewatering sludge; 2) performing constant-temperature hydrothermal treatment on sludge for 2-5 hours at a temperature ranging from 100 to 120 DEG C; 3) culturing a microbial flora by use of a lysozyme broth culture medium, and then inoculating the sludge with the microbial flora, adding a nutrient solution, fermenting under the conditions of a temperature ranging from 50 to 65 DEG C and the moisture content of 45-55%, turning over every four hours, and obtaining the organic fertilizer conforming to organic fertilizer associated standards 5-7 days later. The method for producing the organic fertilizer by treating the sludge by use of the microbial technology has the advantages that 1) the sludge is pretreated by use of high-temperature water before fermentation so that the flocculent structure and the cell membrane structure of the sludge can be broken, and therefore, the cytoplasm in the sludge cells flow out to result in great increase in the content of easily degradable organic matters in the compost and to promote smooth aerobic fermentation, and 2) the constructed microbial flora is capable of efficiently degrading the sludge by use of macromolecular organic matters such as proteins and amino acids, and cellulose.

Description

technical field [0001] The invention relates to the field of producing organic fertilizer by sludge degradation technology, in particular to a method for producing organic fertilizer by treating sludge with microbial technology. Background technique [0002] In recent years, with the development of society and the continuous improvement of people's living standards, urban sewage treatment plants have become more and more popular, and the amount of sludge produced has also increased. Therefore, its treatment and disposal has become an urgent problem to be solved. Composting, as a way to effectively utilize the organic matter in sludge, can convert sludge into organic fertilizer for agricultural production. This method is low in cost and can realize the resource utilization of sludge. However, the sludge from sewage treatment plants After long-term storage, it will turn into black sludge. This kind of sludge has no high temperature period in the process of composting, and is ...

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Problems solved by technology

Composting, as a way to effectively utilize the organic matter in sludge, can convert sludge into organic fertilizer for agricultural production. This method is low in cost and can realize the resource utilization of sludge. However, the sludge from sewage treatment plants After long-term storage, it will turn into black sludge. This kind of sludge has no high temperature period in the process of composting, and is always in a normal temperature state, and then cannot kill the pathogenic bacteria in the sludge, and the organic matter cannot be well decomposed. Colonize

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