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 ...

Examples

Embodiment

[0018] A method for producing organic fertilizer by treating sludge with microbial technology, the steps are as follows:

[0019] 1) Dewater the sludge so that the moisture content of the sludge is 80%;

[0020] 2) The above dewatered sludge was subjected to constant temperature hydrothermal treatment at 121°C for 3 hours;

[0021] 3) Use lysis broth (LB) medium to cultivate microbial bacteria. The lysis broth (LB) medium is composed of tryptone, yeast extract, sodium chloride and deionized water. The concentration of each component in the mixture is It is tryptone 10g / L, yeast extract 5g / L, sodium chloride 10g / L, the pH of the mixture is 7.4; the culture method is to culture on a shaker at 50°C for 24 hours at a speed of 150rpm; The ratio is 1:1000 and inoculated in the sludge. The microorganisms are a mixture of Bacillus subtilis, Bacillus cereus and Bacillus urealyticum, and the mass share of each component is 40 parts of Bacillus subtilis and 40 parts of Bacillus cereus. ...

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 ...

Examples

Embodiment

[0018] A method for producing organic fertilizer by treating sludge with microbial technology, the steps are as follows:

[0019] 1) Dewater the sludge so that the moisture content of the sludge is 80%;

[0020] 2) The above dewatered sludge was subjected to constant temperature hydrothermal treatment at 121°C for 3 hours;

[0021] 3) Use lysis broth (LB) medium to cultivate microbial bacteria. The lysis broth (LB) medium is composed of tryptone, yeast extract, sodium chloride and deionized water. The concentration of each component in the mixture is It is tryptone 10g / L, yeast extract 5g / L, sodium chloride 10g / L, the pH of the mixture is 7.4; the culture method is to culture on a shaker at 50°C for 24 hours at a speed of 150rpm; The ratio is 1:1000 and inoculated in the sludge. The microorganisms are a mixture of Bacillus subtilis, Bacillus cereus and Bacillus urealyticum, and the mass share of each component is 40 parts of Bacillus subtilis and 40 parts of Bacillus cereus. ...

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