Method for breeding earthworms by using fermented sludge

Abstract

The invention relates to the field of sludge treatment and earthworm breeding, in particular to a method for breeding earthworms by using fermented sludge, which comprises the following steps: (1) sludge pretreatment and fermented sludge preparation, (2) auxiliary material selection, (3) uniform mixing and turning, (4) aerobic fermentation, (5) breeding site preparation, (6) earthworm bed preparation and earthworm putting, (7) breeding management and the like. By pretreating and fermenting the sludge, the water content of the sludge is reduced, harmful microorganisms are eliminated, and a suitable growth environment is provided for earthworms, so that the problem of low survival rate of earthworm breeding in the prior art is solved; the method has the advantages that the survival rate of earthworm breeding is increased, efficient combination of sludge treatment and earthworm breeding is achieved by fully utilizing sludge resources (sludge treatment cost), secondary pollution to the environment is reduced, and earnings are increased.

Description

Technical Field

[0001] The present application relates to the fields of sludge treatment and earthworm culture, and in particular, to a method for cultivating earthworms using fermented sludge. Background Art

[0002] The water content of sludge produced during the treatment process of sewage plants is usually around 65-85%. Using this untreated sludge directly for earthworm farming will cause serious problems. Sludge contains harmful microorganisms such as parasite eggs, bacteria and viruses, which threaten the health and survival of earthworms and increase the mortality rate of earthworms. Therefore, it is not feasible to directly use untreated sludge for earthworm farming.

[0003] Most of the sludge earthworm farming projects on the market are currently facing the dilemma of failure, mainly due to the lack of effective sludge pretreatment methods. There is no method in the prior art to reduce the water content of sludge after fermentation to below 40-50% for earthworm farming, which makes it difficult to improve the survival rate of earthworms. In addition, the existing earthworm farming methods mostly use ordinary soil or other traditional substrates in the selection of substrates, and there is a lack of effective solutions for how to efficiently utilize sludge resources for earthworm farming.

[0004] At the same time, with the acceleration of urbanization and the improvement of sewage treatment capacity, the sludge production continues to increase, and the treatment and resource utilization of large amounts of sludge has become an urgent problem to be solved. Traditional sludge treatment methods, such as landfill and incineration, not only occupy a large amount of land resources, but may also cause secondary pollution. Therefore, it is of great significance to develop a method that can effectively treat sludge and realize resource utilization.

[0005] The existing technologies have the following defects in sludge treatment and earthworm farming: lack of effective sludge pretreatment methods, resulting in low survival rate of earthworm farming; failure to fully utilize sludge resources for earthworm farming; lack of efficient methods to combine sludge treatment with earthworm farming; existing sludge treatment methods may cause secondary environmental pollution.

[0006] In view of the above problems, the existing technology needs to be improved urgently. Summary of the invention

[0007] The purpose of this application is to provide a method for cultivating earthworms using fermented sludge, which has the advantages of improving the survival rate of earthworm cultivation, making full use of sludge resources, realizing the efficient combination of sludge treatment and earthworm cultivation, and reducing secondary environmental pollution.

[0008] The present application provides a method for cultivating earthworms using fermented sludge, and the technical scheme is as follows: comprising the following steps:

[0009] 1) Sludge pretreatment and fermentation sludge preparation: Sludge with a water content of 65-85% is obtained through the sludge treatment system of the sewage treatment plant.

[0010] 2) Selection of auxiliary materials: Select dry carbon source auxiliary materials and / or nitrogen source auxiliary materials.

[0011] 3) Mixing and turning: Add the carbon source auxiliary material and / or nitrogen source auxiliary material selected in step 2) to the pretreated sludge according to the set ratio, and then use a turning device to fully turn the sludge after adding the auxiliary material to make the auxiliary material and the sludge evenly mixed; mix evenly and control the moisture content of the sludge to be 55-65%.

[0012] 4) Aerobic fermentation: inoculate the sludge in step 3) with microbial flora and ferment at room temperature, humidity of 55-65%, and pH of 6-8; the fermentation time is 20-25 days, and the fermentation temperature rises to 60-70°C to achieve sterilization and harmlessness until the water content of the sludge is reduced to 40-50%.

[0013] 5) Preparation of breeding site: Choose a place with plenty of sunshine and not susceptible to strong wind as the earthworm breeding site.

[0014] 6) Preparation of earthworm bed and placement of earthworms: The sludge from step 4) is spread into an earthworm bed with a thickness of 20-30 cm in the breeding site. Healthy and vigorous earthworm species are selected and placed at a density of 0.5-1.5 kg of earthworms per square meter of earthworm bed.

[0015] 7) Breeding management: Maintain the breeding environment temperature at 15-25℃, maintain the humidity of the earthworm bed at 40%-0% by spraying water or ventilation, and regularly add an appropriate amount of fermented nutrient soil to the earthworm bed as a supplementary bait to ensure that the earthworms have sufficient food sources; check the earthworm bed every 2-3 days to observe the growth status of the earthworms and whether there are any diseases or pests.

[0016] Furthermore, the present application also proposes that the carbon source auxiliary material is selected from straw, tree branches and leaves or sawdust.

[0017] Furthermore, the present application also proposes that the nitrogen source auxiliary material is animal manure.

[0018] Furthermore, the present application also proposes that in the step 3), the addition ratio of the carbon source auxiliary material and / or the nitrogen source auxiliary material is determined according to the initial water content of the sludge, the water content and adsorption performance of the carbon source and nitrogen source auxiliary materials.

[0019] Furthermore, the present application also proposes that the ratio of the sludge weight to the total weight of auxiliary materials is 7:3.

[0020] Furthermore, the present application also proposes that in step 3), the tossing time is 15-60 minutes.

[0021] Furthermore, the present application also proposes that the microbial flora is Bacillus, lactic acid bacteria, etc.

[0022] Furthermore, the present application also proposes that in the step 5), the breeding ground is paved with 10-20 cm of gravel or coarse sand breathable material to ensure good drainage.

[0023] Furthermore, the present application also proposes that the selected earthworm is Eisenia fetida.

[0024] From the above, it can be seen that the present application provides a method for breeding earthworms using fermented sludge, including sludge pretreatment and fermentation sludge preparation, auxiliary material selection, mixing and turning, aerobic fermentation, breeding site preparation, earthworm bed preparation and earthworm release, breeding management and other steps. By pretreating and fermenting the sludge, the sludge water content is reduced, harmful microorganisms are eliminated, and a suitable growth environment is provided for earthworms, thereby solving the problem of low earthworm breeding survival rate in the prior art. It has the advantages of improving the survival rate of earthworm breeding, making full use of sludge resources, realizing the efficient combination of sludge treatment and earthworm breeding, and reducing secondary environmental pollution. DETAILED DESCRIPTION

[0025] In order to make the purpose, technical scheme and advantages of the present invention clearer, the present invention is further described in detail by examples below. However, it should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the scope of the present invention. In addition, in the following description, the description of known structures and technologies is omitted to avoid unnecessary confusion of the concept of the present invention.

[0026] The present application relates to a method for cultivating earthworms using fermented sludge, aiming to solve the problem of earthworm death caused by direct use of sludge in earthworm cultivation. Sludge, when untreated, usually contains harmful components such as parasite eggs, bacteria and viruses, and direct use will have an adverse effect on the growth of earthworms. By pre-treating and fermenting the sludge, these harmful components can be eliminated and the sludge can be converted into a nutrient matrix suitable for earthworm growth.

[0027] The water content of sludge produced during sewage treatment is usually around 65-85%. Since the sludge contains parasite eggs, bacteria, and viruses, this untreated sludge directly used for earthworm farming will cause the earthworms to die. However, there is no method to effectively apply sludge with a water content of less than 40-50% after fermentation to earthworm farming to improve the survival rate of earthworms. Existing earthworm farming methods mostly use ordinary soil or other traditional substrates in the selection of substrates. There is a lack of efficient methods for using sludge resources for earthworm farming, and the treatment of large amounts of sludge also requires more reasonable and effective resource utilization methods.

[0028] The method of the present application comprises the following steps: first, through the sludge treatment system of the sewage treatment plant, sludge with a water content of 65-85% is obtained. Then, dry carbon source auxiliary materials and / or nitrogen source auxiliary materials are selected, and these auxiliary materials are added to the pretreated sludge according to the set ratio, and the sludge after adding the auxiliary materials is fully turned over by using a turning and throwing device, so that the auxiliary materials and the sludge are evenly mixed, and the water content of the sludge is controlled to be 55-65%. Then, the sludge is inoculated with microbial flora, and fermented at room temperature, humidity of 55-65%, and pH of 6-8. The fermentation time is 20-25 days, and the fermentation temperature rises to 60-70°C to achieve sterilization and harmlessness until the water content of the sludge is reduced to 40-50% and converted into nutrient soil after fermentation. Then, choose a sunny place that is not easily affected by strong winds as the earthworm breeding site, and lay the fermented sludge into a 20-30 cm thick earthworm bed in the breeding site. Choose healthy and vigorous earthworm varieties and place 0.5-1.5 kg of earthworms per square meter of earthworm bed. Finally, keep the breeding environment temperature at 15-25℃, maintain the humidity of the earthworm bed at 40%-60% by spraying water or ventilation, regularly add an appropriate amount of fermented nutrient soil to the earthworm bed as supplementary bait to ensure that the earthworms have sufficient food sources, and check the earthworm bed every 2-3 days to observe the growth status of the earthworms and whether there are any diseases and pests.

[0029] Through the above method, sludge suitable for fermentation can be obtained; auxiliary material selection and mixing and turning steps ensure that the sludge has balanced nutrition and appropriate water content; the aerobic fermentation step reduces the water content of the sludge and eliminates harmful components through microbial fermentation; the breeding site preparation, earthworm bed preparation and earthworm placement steps provide a suitable living environment for earthworms; the breeding management step ensures the healthy growth of earthworms through the control of temperature, humidity and bait. Through the coordination of these steps, the problem of earthworm death caused by direct use of sludge in earthworm breeding can be effectively solved.

[0030] For example, in the sludge pretreatment and fermentation sludge preparation stage, the water content of the sludge in the sewage treatment plant is below 85%. Select dry carbon source auxiliary materials such as straw, branches and leaves or sawdust, and nitrogen source auxiliary materials such as animal manure, and add these auxiliary materials to the pretreated sludge according to the set ratio. Use the turning and throwing equipment to fully turn the sludge after adding the auxiliary materials, so that the auxiliary materials and the sludge are evenly mixed, and the water content of the sludge is controlled to 55-65%. Then, microbial flora such as Bacillus, lactic acid bacteria, etc. are inoculated into the sludge, and fermentation is carried out under normal temperature, humidity of 55-65%, and pH of 6-8. The fermentation time is 20-25 days, and the fermentation temperature rises to 60-70°C to achieve sterilization and harmlessness until the water content of the sludge is reduced to 40-50%, and the fermented nutrient soil is obtained.

[0031] During the preparation stage of the breeding site, choose a sunny place that is not easily affected by strong winds as the earthworm breeding site, and lay 10-20 cm of gravel or coarse sand breathable materials to ensure good drainage. Lay the fermented sludge into a 20-30 cm thick earthworm bed in the breeding site, select healthy and vigorous Eisenia fetida, and place 0.5-1.5 kg of earthworms per square meter of earthworm bed. Keep the breeding environment temperature at 15-25℃, maintain the humidity of the earthworm bed at 40%-60% by spraying water or ventilation, and regularly add an appropriate amount of fermented nutrient soil to the earthworm bed as a supplementary bait to ensure that the earthworms have sufficient food sources. Check the earthworm bed every 2-3 days to observe the growth status of the earthworms and whether there are any diseases and pests.

[0032] Compared with the existing technology, the present application improves the survival rate and growth rate of earthworm farming by fermenting sludge, solves the problem of earthworm death caused by direct use of sludge in earthworm farming, and realizes the resource utilization of sludge.

[0033] Furthermore, the present application also proposes that the carbon source auxiliary material is selected from straw, tree branches and leaves or sawdust.

[0034] Carbon source auxiliary materials include straw, branches and leaves, or sawdust. These auxiliary materials can provide necessary carbon sources when breeding earthworms, improve the structure and aeration of sludge, and promote the growth of earthworms. This method can solve the problem of choosing suitable carbon source auxiliary materials when breeding earthworms. The selection of these auxiliary materials helps to improve the survival rate and growth efficiency of earthworms and promote the effective utilization of sludge resources.

[0035] There are many possible ways to use straw, branches and leaves, and sawdust as carbon source auxiliary materials. For example, straw can be crushed or cut into small pieces before use, branches and leaves can be naturally air-dried before use, and sawdust can be used directly or after screening to remove impurities. Furthermore, these carbon source auxiliary materials can be used alone or in combination to achieve the best effect. In addition, these auxiliary materials can also be pre-treated according to specific needs, such as microbial fermentation, to improve their effect.

[0036] The present application effectively solves the problem of selecting suitable auxiliary materials when breeding earthworms by selecting straw, branches and leaves or sawdust as carbon source auxiliary materials. These auxiliary materials not only provide the carbon source required for the growth of earthworms, but also improve the structure and aeration of sludge, significantly improving the survival rate and growth efficiency of earthworms. Compared with the prior art, the method of the present application is more efficient and can better utilize sludge resources to achieve effective utilization of resources.

[0037] Furthermore, the present application also proposes that the nitrogen source auxiliary material is animal manure.

[0038] Animal manure, as a nitrogen source auxiliary material, provides abundant nitrogen in earthworm farming, promoting the growth and reproduction of earthworms. By using animal manure, the nutrients, survival rate and breeding efficiency of earthworms can be effectively improved.

[0039] Animal manure can be cow manure, chicken manure or pig manure, etc. These manures can be directly used for earthworm farming after being treated with microbial fermentation. Specifically, animal manure should first be composted to eliminate harmful microorganisms and parasite eggs, while reducing its water content to make it more suitable as feed for earthworms. The time and conditions of composting fermentation can be adjusted according to the specific type and amount of manure. For example, the composting fermentation time of cow manure can be 3-4 weeks, and the fermentation temperature is controlled at 50-60℃. The fermented animal manure should be mixed with the pre-treated sludge in a set ratio to ensure that the earthworms can obtain balanced nutrition.

[0040] By selecting animal manure as a nitrogen source auxiliary material, the present application provides a method for efficiently utilizing waste resources, which not only solves the problem of sludge and animal manure treatment, but also significantly improves the survival rate and breeding efficiency of earthworms. Compared with the prior art, the method of the present application provides a richer source of nutrition in the earthworm breeding process, promotes the rapid growth and reproduction of earthworms, and has significant technical advantages.

[0041] Furthermore, the present application also proposes to determine the addition ratio of the carbon source and nitrogen source auxiliary materials according to the initial water content of the sludge, the water content and adsorption performance of the carbon source and nitrogen source auxiliary materials.

[0042] This application solves the problem of how to determine the addition ratio of carbon source and nitrogen source auxiliary materials in the process of cultivating earthworms using fermented sludge by determining the addition ratio of carbon source and nitrogen source auxiliary materials according to the initial water content of the sludge, the water content of the carbon source and nitrogen source auxiliary materials, and the adsorption performance. The initial water content of the sludge directly affects the amount of auxiliary materials added. Sludge with high water content requires more auxiliary materials to adjust the moisture content of the earthworm bed, and vice versa. The water content of carbon source and nitrogen source auxiliary materials will affect the moisture content of the final earthworm bed, and the adsorption performance will affect the degree of mixing uniformity of the auxiliary materials and sludge. By comprehensively considering these three factors, a suitable auxiliary material addition ratio can be determined to ensure that the earthworm bed has a suitable moisture content and nutrients, provide a good growth environment for earthworms, and improve the survival rate and yield of earthworms. The core of this solution is to dynamically adjust the auxiliary material ratio according to the characteristics of the sludge and auxiliary materials, rather than using a fixed ratio, which improves the adaptability and practicality of the method.

[0043] Specifically, the initial water content of the sludge can be measured by conventional water content determination methods. The water content of carbon source auxiliary materials and nitrogen source auxiliary materials can also be measured by similar methods. The adsorption performance can be determined by experimental methods, such as determining the adsorption capacity of auxiliary materials for water through adsorption experiments. Based on these measurement results, the ratio of carbon source and nitrogen source auxiliary materials to be added is calculated. As a preferred embodiment, the optimal auxiliary material addition ratio under different conditions can be obtained through experiments and applied to actual production.

[0044] This method can effectively solve the problem in the prior art that it is difficult to determine the proportion of auxiliary materials to be added when using sludge to cultivate earthworms. Compared with the prior art, the method of the present application can be dynamically adjusted according to the actual situation of sludge and auxiliary materials, avoiding the problems that may be caused by fixed proportions, and improving the success rate and efficiency of earthworm cultivation. Therefore, the present application has significant advantages in utilizing sludge resources for earthworm cultivation.

[0045] Furthermore, the present application also proposes that the ratio of sludge weight to total auxiliary material weight is 7:3.

[0046] By setting the weight ratio of sludge to auxiliary materials at 7:3, it can be ensured that the water content and nutrients of the sludge and auxiliary materials after mixing are suitable for the growth of earthworms. This ratio can optimize the physical and chemical properties of sludge, making it more suitable as a culture medium for earthworms, thereby increasing the survival rate of earthworms and avoiding the problem of earthworm death caused by improper sludge treatment.

[0047] In the ratio of sludge to auxiliary materials, the ratio of sludge weight to total auxiliary materials weight is 7:3. Specifically, the auxiliary materials can be dry carbon source auxiliary materials and / or nitrogen source auxiliary materials, such as straw, branches and leaves, sawdust or animal manure. Through this ratio, the water content and nutrient content of the mixture can be effectively adjusted to make it more suitable for the growth environment of earthworms.

[0048] By setting the ratio of sludge weight to the total weight of auxiliary materials to 7:3, it is possible to ensure that the water content and nutrients of the mixture are suitable for the growth of earthworms, optimize the physical and chemical properties of the sludge, and make it more suitable as a culture matrix for earthworms. This technical solution solves the problem of earthworm death caused by improper sludge treatment in the prior art and improves the survival rate of earthworms.

[0049] Furthermore, the present application also proposes that in step 3, the turning and tossing time is 15-60 minutes.

[0050] By setting the turning and throwing time, it can ensure that the sludge and auxiliary materials are fully mixed, thus making the mixing of sludge and auxiliary materials more uniform. By setting the turning and throwing time, it can avoid the problem of uneven mixing caused by insufficient or excessive turning and throwing time. This technical feature can effectively solve the problem of uneven mixing of sludge and auxiliary materials and ensure the smooth progress of subsequent fermentation and breeding processes.

[0051] The setting range of the turning and throwing time is 15 - 60 minutes, which can be adjusted according to actual operating conditions. For example, when dealing with a large amount of sludge, a longer turning and throwing time can be selected to ensure that the sludge and auxiliary materials are fully mixed. On the contrary, when dealing with a small amount of sludge, a shorter turning and throwing time can be selected to improve work efficiency. In addition, the choice of turning and throwing equipment will also affect the setting of the turning and throwing time. For example, using high-performance turning and throwing equipment can shorten the turning and throwing time.

[0052] This technical feature solves the problem of uneven mixing of sludge and auxiliary materials by reasonably setting the turning and throwing time, making the mixing of sludge and auxiliary materials more uniform, and ensuring the smooth progress of subsequent fermentation and earthworm breeding processes. Compared with the prior art, this technical feature improves the efficiency and effect of sludge treatment and avoids the problems of incomplete fermentation and earthworm breeding failure caused by uneven mixing.

[0053] Furthermore, this application also proposes that the microbial flora is Bacillus, Lactobacillus, etc. During the earthworm breeding process, Bacillus, Lactobacillus, etc. play an important role as the microbial flora in the sludge fermentation stage. Bacillus, Lactobacillus, etc. can effectively decompose the organic matter in the sludge and reduce the content of harmful substances in the sludge. Through the fermentation of these microorganisms, not only can the water content of the sludge be reduced, but also the stability and safety of the sludge can be improved, making it more suitable for earthworm breeding. Finally, through this method, the fermented sludge is effectively utilized to improve the survival rate and growth status of earthworms.

[0054] Bacillus, Lactobacillus, etc. are common microbial flora that can grow and reproduce under different environmental conditions. Lactobacillus can produce lactic acid through fermentation, effectively reducing the pH value in the sludge, thereby inhibiting the growth of harmful microorganisms. Specifically, the application of Bacillus can be achieved through the following several methods:

[0055] Direct inoculation: Directly inoculate Bacillus, Lactobacillus, etc. into the pretreated sludge, control the fermentation conditions, and make them reproduce and play a role in the sludge.

[0056] Pre-culture: First, culture Bacillus, photosynthetic bacteria, etc. under laboratory conditions. After reaching a certain quantity, then inoculate them into the sludge for fermentation.

[0057] Mixed inoculation: Mix Bacillus, lactic acid bacteria, etc. to give full play to the synergistic effect of the two and improve fermentation efficiency.

[0058] By using Bacillus, lactic acid bacteria, etc. as microbial flora, the efficiency and effect of sludge fermentation can be significantly improved. Compared with the prior art, the technical solution of the present application can more effectively utilize sludge resources and improve the survival rate and growth of earthworms. At the same time, by rationally utilizing microbial flora, the cost of sludge treatment can be reduced, and efficient utilization of sludge resources can be achieved.

[0059] Furthermore, the present application also proposes that in step 5), the breeding ground is paved with 10-20 cm of gravel or coarse sand breathable material to ensure good drainage.

[0060] In the process of earthworm farming, poor drainage will cause the earthworm growth environment to be too humid, thus affecting the growth and survival rate of earthworms. By laying 10-20 cm of gravel or coarse sand breathable materials in the breeding site, the drainage capacity can be effectively improved, and a suitable humidity environment can be maintained, thereby increasing the survival rate and growth rate of earthworms. This breathable material can not only drain water, but also provide good ventilation conditions, which helps to maintain the overall environmental stability of the earthworm breeding site.

[0061] Specifically, the step of laying gravel or coarse sand breathable materials can include the following implementation methods: First, gravel with a particle size of 2-5 cm can be selected for laying. This material has a large porosity and can quickly drain excess water. Secondly, coarse sand can be used, and coarse sand with a particle size of 0.5-2 cm can be selected for laying. This material also has good water permeability and ventilation. In addition, the mixed use of gravel and coarse sand is also a feasible solution. By adjusting the ratio of the two, the drainage and ventilation effects can be optimized according to actual conditions. Furthermore, a layer of gauze or non-woven fabric can be added on top of the breathable material to prevent earthworms from drilling into the breathable layer while maintaining good drainage effects.

[0062] Therefore, the present application solves the problem of poor drainage during earthworm farming by laying 10-20 cm of gravel or coarse sand breathable material in the breeding site. Compared with the prior art, the present application provides a simple and effective solution, which significantly improves the survival rate and growth rate of earthworms while maintaining the environmental stability of the breeding site.

[0063] Furthermore, the present application also proposes that the selected earthworm is Eisenia fetida.

[0064] Eisenia fetida was selected as the species for earthworm farming. Eisenia fetida has a higher survival rate and growth rate in earthworm farming and can better adapt to the environment where fermented sludge is used as a nutrient matrix. This choice helps to improve the success rate and efficiency of earthworm farming, thereby effectively utilizing fermented sludge resources.

[0065] Eisenia fetida is a species widely used in earthworm farming, with strong adaptability and high reproduction rate. Specifically, Eisenia fetida can survive under different temperature and humidity conditions, and has a good ability to decompose organic matter in fermented sludge. As a preferred embodiment, appropriate pretreatment can be carried out before the earthworms are released to ensure that the Eisenia fetida can adapt to the new environment more quickly. For example, the Eisenia fetida can be raised in a culture matrix with strong adaptability for a period of time, and then gradually transitioned to fermented sludge.

[0066] By selecting Eisenia fetida as the breeding variety, the present application can significantly improve the survival rate and growth rate of earthworms, thereby improving the breeding efficiency. Compared with the prior art, the method of the present application is more scientific and reasonable in substrate selection, can effectively utilize fermented sludge resources, and solves the problems of low survival rate and low efficiency in traditional earthworm breeding methods. Therefore, the present application not only improves the success rate of earthworm breeding, but also provides a new way for the rational utilization of sludge resources.

[0067] The above description is only an embodiment of the present application and is not intended to limit the protection scope of the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A method for cultivating earthworms using fermented sludge, characterized in that The following steps are involved: 1) Sludge pretreatment and fermentation sludge preparation: Sludge with a water content of 65-85% is obtained through the sludge treatment system of the sewage treatment plant; 2) Selection of auxiliary materials: Select dry carbon source auxiliary materials and / or nitrogen source auxiliary materials. 3) Mixing and turning: adding the carbon source auxiliary material and / or nitrogen source auxiliary material selected in step 2) to the pretreated sludge according to the set ratio, and then using a turning and turning device to fully turn the sludge after adding the auxiliary material to make the auxiliary material and the sludge evenly mixed; mixing evenly and controlling the moisture content of the sludge to 55-65%; 4) Aerobic fermentation: inoculating the sludge in step 3) with microbial flora, and carrying out microbial aerobic fermentation at room temperature, humidity of 55-65%, and pH of 6-8; the fermentation time is 20-25 days, and the fermentation temperature rises to 60-70° C. to achieve sterilization and harmlessness, until the water content of the sludge is reduced to 40-50%; 5) Preparation of breeding site: Choose a place with plenty of sunshine and not susceptible to strong wind as the earthworm breeding site. 6) Preparation of earthworm bed and placement of earthworms: The sludge from step 4) is spread into an earthworm bed with a thickness of 20-30 cm in the breeding site. Healthy and vigorous earthworm species are selected and placed at a density of 0.5-1.5 kg of earthworms per square meter of earthworm bed. 7) Breeding management: Maintain the breeding environment temperature at 15-25℃, maintain the humidity of the earthworm bed at 40%-0% by spraying water or ventilation, and regularly add an appropriate amount of fermented nutrient soil to the earthworm bed as a supplementary bait to ensure that the earthworms have sufficient food sources; check the earthworm bed every 2-3 days to observe the growth status of the earthworms and whether there are any diseases or pests.

2. The method for cultivating earthworms using fermented sludge according to claim 1, characterized in that: The carbon source auxiliary material is selected from straw, branches and leaves or sawdust.

3. The method for cultivating earthworms using fermented sludge according to claim 1, characterized in that: The nitrogen source auxiliary material is animal feces.

4. The method for cultivating earthworms using fermented sludge according to claim 1, characterized in that: In the step 3), the addition ratio of the carbon source auxiliary material and / or the nitrogen source auxiliary material is determined according to the initial water content of the sludge, the water content and adsorption performance of the carbon source and nitrogen source auxiliary materials.

5. The method for cultivating earthworms using fermented sludge according to claim 4, characterized in that: in, The ratio of the sludge weight to the total weight of auxiliary materials is 7:

3.

6. The method for cultivating earthworms using fermented sludge according to claim 1, characterized in that: In step 3), the tossing time is 15-60 minutes.

7. The method for cultivating earthworms using fermented sludge according to claim 1, characterized in that: The microbial flora includes bacillus, lactic acid bacteria and the like.

8. The method for cultivating earthworms using fermented sludge according to claim 1, characterized in that: In step 5), the breeding ground is paved with 10-20 cm of gravel or coarse sand breathable material to ensure good drainage.

9. The method for cultivating earthworms using fermented sludge according to claim 1, characterized in that: The earthworm selected is Eisenia fetida.