Water hyacinth and pig manure resource utilization and compost preparation method

Abstract

The invention discloses a water hyacinth and pig manure resource utilization and compost preparation method. The water hyacinth and pig manure resource utilization and compost preparation method comprises the following steps of site selection and arrangement, water hyacinth smashing and pig manure fermentation, breeding bed arrangement, water hyacinth and pig manure adding, compost preparation and daily management. According to the developed water hyacinth and earthworm breeding technology, dual resource utilization of the water hyacinth and a manure source is achieved, a traditional incineration or biogas fermentation mode is replaced, carbon emission in the water hyacinth treatment process is effectively reduced, and the low-carbon, energy-saving and environment-friendly requirements are met. The earthworm is used for treating the water hyacinth and the pig manure, the process is simple, special equipment is not needed, high-protein bait earthworms and high-quality organic compost earthworm cast can be obtained, and earthworm compost can improve the soil environment and improve the soil carbon sink potential. By evaluating the biomass carbon conversion efficiency including the earthworm yield, the soil carbon reserve and the like, data support is provided for carbon sink of earthworm cultivation, and the purposes of carbon peak reaching and carbon neutralization are assisted to be achieved.

Description

Technical Field

[0001] The invention relates to the technical field of dual resource utilization of water hyacinth and manure, in particular to a resource utilization of water hyacinth and pig manure and a compost preparation method thereof. Background Art

[0002] Since 2004, the proliferation of water hyacinth has had a serious impact on the reservoir areas in the Minjiang River Basin, especially the Shuikou Reservoir Area, which has seriously threatened the water quality and ecological environment of the Minjiang River Basin. A large number of water hyacinths have accumulated in front of the dam of the Shuikou Power Station, which will also affect the navigation of ships and the power generation of the hydropower station, posing a potential safety hazard. In 2012, the provincial government organized the water hyacinth control and cleaning work in the Minjiang River Basin, which was carried out every three years and achieved good results. As the proportion of plastic and foam garbage of water hyacinth in the reservoir area increases, it is not easy to decompose after salvage, which will cause a serious shortage of stacking and landfill sites. In particular, as organic waste, how to harmlessly treat water hyacinth after landing, and at the same time transform and utilize it to turn waste into treasure, which must not only meet environmental protection but also create benefits, is a key issue in the current development of water hyacinth control technology. The resource disposal of water hyacinth is a top priority in the water hyacinth control and cleaning work in the Minjiang River Basin. Therefore, exploring the resource utilization / harmless treatment technology of water hyacinth and other biomass in the Minjiang River Basin after they are brought ashore is of great significance for strengthening and consolidating the control effect of water hyacinth in the Minjiang River Basin.

[0003] The following principles and requirements should be followed for the resource utilization and harmless treatment of water hyacinths after they come ashore in the Minjiang River Basin:

[0004] 1) In the treatment of water hyacinth, it is required to follow the principle of "resource utilization, reduction and harmlessness", advocate and explore the resource utilization and comprehensive utilization technology of water hyacinth, and improve the recycling efficiency of water hyacinth biomass. Strengthen source control and implement both symptomatic and root cause treatment.

[0005] 2) Water hyacinth and other garbage shall not be piled up on the slopes and banks of rivers and channels. Water hyacinth must be disposed of harmlessly, and disposal methods such as landfill or incineration that may cause secondary environmental pollution shall not be used.

[0006] 3) We need to fully value and utilize the pollution control and carbon sequestration functions of water hyacinth, and follow the principle of some control and some development, so as to meet the requirements of green environmental protection and maximize the ecological benefits.

[0007] 4) The collected water hyacinths need to be recorded and tracked for their specific whereabouts, and resource-based and harmless disposal methods must be implemented to form a complete and feasible technical plan.

[0008] At present, there are some low-end utilization solutions for water hyacinth resources, such as direct crushing and landfilling, fermentation to produce biogas, and animal feed. However, due to the low added value and poor ecological and social benefits of these products, they have not been substantially promoted and applied, and this implementation plan no longer advocates their application. Summary of the invention

[0009] The object of the present invention is to provide a method for resource utilization of water hyacinth and pig manure and compost preparation thereof, so as to solve the problems raised in the above-mentioned background technology.

[0010] To achieve the above object, the present invention provides the following technical solutions:

[0011] A method for resource utilization of water hyacinth and pig manure and compost preparation thereof comprises the following steps:

[0012] S1: Site selection and layout: The breeding sites for earthworms are selected in forests or fields. In terms of site layout, the site should be equipped with water spraying equipment and sunshade nets to prevent the soil from being too dry due to the hot weather in summer. Grape vegetables and fruit plants can also be planted to provide shade. In addition, drainage ditches should be set up to prevent earthworms from being soaked or submerged for a long time during the rainy season or rainstorms.

[0013] S2: Crushing water hyacinth and fermenting pig manure: First, ferment the pig manure, use feces fermentation agent to mix into the pig manure, control the moisture at 65%, and ferment according to the original moisture content of the pig manure. Chop the water hyacinth, mix and stir it with the fermented pig manure, keep it moist, and the mass ratio of water hyacinth to pig manure is 3 / 1-1 / 1. Then you can breed it, which is very beneficial for the absorption of nutrients by earthworms;

[0014] S3: Setting up breeding beds: After the pig manure is fermented, it is mixed with water hyacinth, and a fermentation bed of a reasonable area is set up according to the number of earthworms to be raised. The pig manure is placed in the breeding bed and piled into a 30cm manure pile;

[0015] S4: Addition of water hyacinth and pig manure: When water hyacinth and pig manure are consumed to a certain extent, they need to be added in time to ensure the normal growth of earthworms and maintain efficient consumption of water hyacinth and pig manure;

[0016] S5: Daily management: The temperature and humidity of the earthworms should be well controlled. The changes in temperature and humidity have a great impact on the growth of earthworms. The pH value of pig manure should be moderate. Too high or too low will inhibit the growth of earthworms. In the high temperature environment in summer, watering is required once a day. The water must not be polluted and must be irrigated thoroughly to ensure the normal growth of earthworms.

[0017] S6: Compost preparation: After the water hyacinth and pig manure are fully transformed and decomposed in the earthworm breeding process, the earthworms are promptly removed from the breeding beds, and the earthworm castings and remaining waste are collected and dried for use in compost preparation.

[0018] As a further solution of the present invention: in S1, the criterion for land selection is loose, fertile soil with high organic matter content. If it is mountainous land, the bottom of a slope or gravel land, it is necessary to first use a tiller or rotary tiller to plow or rotary tillage to level the soil so that the soil remains loose. For fields with uneven soil surfaces, paddy field driven harrow equipment can also be used to level the soil after plowing or rotary tillage.

[0019] As a further solution of the present invention: in S2, pay attention to the fermentation temperature. When the temperature rises to 65°C, turn the pig manure over, lower the temperature and then conduct secondary fermentation to prevent the nutrients from being destroyed. Cover with plastic film during fermentation. When the wine aroma is emitted or white mycelium appears in 12-15 days, you can start breeding.

[0020] As a further solution of the present invention: in S3, add an appropriate amount of chopped water hyacinth to the manure pile, and rake the manure pile once to promote uniform exposure to the sun. When the manure pile is 60% dry, you can start to put in the earthworm seeds, control the breeding density, and adjust it appropriately according to seasonal changes. For example, in winter, you can breed them densely, and in summer, you should reduce the breeding density. After putting in the earthworm seeds, cover them with a layer of shade net or straw to shade, moisturize and keep warm. If the earthworms shrink or die abnormally, pay attention to whether the pig manure fermentation is incomplete. If so, they need to be fermented again.

[0021] As a further solution of the present invention: in S4, the frequency and amount of adding water hyacinth and pig manure should not be too large, otherwise it will cause too much pressure on the earthworm and affect its growth. In addition, the permeability of the dung pile should be enhanced to improve the water retention capacity and ensure the normal growth of the earthworm. Normally, the humidity of fresh water hyacinth and pig manure should be kept above 60%, and they should be piled together for fermentation as backup feed for the earthworm.

[0022] As a further solution of the present invention: in S5, the temperature for the growth of earthworms is 18°C, the lowest temperature cannot be lower than 5°C, and the highest temperature cannot be higher than 30°C, otherwise it will have a greater impact on the earthworms, and even cause death in severe cases. The humidity must be controlled at 65%.

[0023] As a further scheme of the present invention: in S5, in order to find the best green and low-carbon resource utilization scheme, it is necessary to calculate the conversion efficiency of biochar. The energy of water hyacinth and pig manure will be converted into three parts. First, it is converted into gaseous CO2 and diffused into the atmosphere; second, a part is absorbed by artificially cultivated earthworms; third, it flows into the soil with water, and the carbon content of CO2 needs to be captured with the help of a greenhouse gas static box, and then measured by a greenhouse gas analyzer; the carbon content in the soil needs to be measured by a total carbon analyzer; finally, the conversion of earthworms is to weigh the dry weight of earthworms, and finally a comprehensive analysis is carried out to find the best raw material ratio and fermentation time of feces and water hyacinth, creating the highest biological conversion efficiency for the recycling of "pig manure and water hyacinth" materials.

[0024] As a further solution of the present invention: in S6, after the earthworms are cultured for three months, the earthworms are moved out of the culture bed, and the earthworm castings, soil particles and residual waste are collected, dried, bagged and packaged to make compost, which can be used for crop planting or soil improvement and restoration.

[0025] Compared with the prior art, the present invention has the following beneficial effects:

[0026] The present invention is based on the ecological breeding technology of "water hyacinth and pig manure" earthworms. While achieving stabilization, reduction and harmlessness, it obtains earthworm manure and earthworm products with high added value. The water hyacinth earthworm breeding technology developed realizes the dual resource utilization of water hyacinth and manure sources, replaces the traditional incineration or fermentation of biogas, effectively reduces the carbon emissions in the water hyacinth treatment process, and meets the requirements of low-carbon energy conservation and environmental protection. Using earthworms to treat water hyacinth and pig manure is not only simple in process and does not require special equipment, but also can obtain high-protein feed earthworms and high-quality organic compost earthworm manure. The prepared compost can improve the soil environment and increase the soil carbon sink potential. By evaluating the biomass carbon conversion efficiency, including the yield of earthworms, soil carbon reserves, etc., data support is provided for the carbon sink of earthworm breeding, helping to achieve the goals of carbon peak and carbon neutrality. This technology can provide advanced technical support for the future resource utilization of water hyacinth, solve the resource utilization problem of water hyacinth and pig manure, improve the biomass recycling conversion efficiency of water hyacinth and pig manure, and find new ways. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 This is a diagram of the resource utilization plan for the green and low-carbon "water hyacinth + pig manure" earthworm farming.

[0028] Figure 2 This is the effect diagram of earthworm breeding with the ingredient quality ratio of water hyacinth to pig manure = 3:1.

[0029] Figure 3 This is a map of the resource utilization base for "water hyacinth + pig manure" earthworm breeding.

[0030] Figure 4 This is the soil index test results after using compost for earthworm breeding. DETAILED DESCRIPTION

[0031] The word “exemplary” is used exclusively herein to mean “serving as an example, example, or illustration.” Any embodiment described herein as “exemplary” is not necessarily to be construed as preferred or advantageous over other embodiments.

[0032] In addition, in order to better illustrate the present application, numerous specific details are provided in the specific embodiments below. It should be understood by those skilled in the art that the present application can also be implemented without certain specific details. In some examples, methods, means, and elements well known to those skilled in the art are not described in detail in order to highlight the subject matter of the present application.

[0033] Embodiment 1

[0034] A method for resource utilization of water hyacinth and pig manure and compost preparation thereof comprises the following steps:

[0035] S1: Site selection and layout: The breeding sites for earthworms are selected in forests or fields. In terms of site layout, the site should be equipped with water spraying equipment to prevent the soil from being too dry due to the hot weather in summer. In addition, drainage ditches should be set up to prevent earthworms from being soaked or submerged for a long time during the rainy season or rainstorms.

[0036] S2: Crushing water hyacinth and fermenting pig manure: First, ferment the pig manure, use feces fermentation agent to mix into the pig manure, control the moisture at 65%, and ferment according to the original moisture content of the pig manure. Chop the water hyacinth, mix and stir it with the fermented pig manure, keep it moist, and the mass ratio of water hyacinth to pig manure is 3 / 1-1 / 1. Then you can breed it, which is very beneficial for the absorption of nutrients by earthworms;

[0037] S3: Setting up breeding beds: After the pig manure is fermented, it is mixed with water hyacinth, and a fermentation bed of a reasonable area is set up according to the number of earthworms to be raised. The pig manure is placed in the breeding bed and piled into a 30cm manure pile;

[0038] S4: Addition of water hyacinth and pig manure: When water hyacinth and pig manure are consumed to a certain extent, they need to be added in time to ensure the normal growth of earthworms and maintain efficient consumption of water hyacinth and pig manure;

[0039] S5: Daily management: It is necessary to control the temperature and humidity of the earthworm's growth. The changes in temperature and humidity have a great impact on the growth of earthworms. The pH value of pig manure should be moderate. Too high or too low will inhibit the growth of earthworms. In the high temperature environment in summer, it is necessary to water once a day. The water must not be contaminated and must be watered thoroughly to ensure the normal growth of earthworms.

[0040] It should be specifically explained that the resource utilization of water hyacinth and pig manure can be achieved through the above steps.

[0041] Embodiment 2

[0042] A method for resource utilization of water hyacinth and pig manure and compost preparation thereof comprises the following steps:

[0043] S1: Site selection and layout: The breeding sites for earthworms are selected in forests or fields. In terms of site layout, the site should be equipped with water spraying equipment to prevent the soil from being too dry due to the hot weather in summer. In addition, drainage ditches should be set up to prevent earthworms from being soaked or submerged for a long time during the rainy season or rainstorms.

[0044] Specifically, in S1, the criteria for selecting land is loose, fertile soil with high organic matter content. If it is a mountainous area, a slope bottom or a gravelly land, it is necessary to first use a tiller or a rotary tiller to plow or level the soil to keep the soil loose. For fields with uneven soil surfaces, paddy field driven harrow equipment can also be used to level the soil after plowing or rotary tilling.

[0045] S2: Crushing water hyacinth and fermenting pig manure: First, ferment the pig manure, use feces fermentation agent to mix into the pig manure, control the moisture at 65%, and ferment according to the original moisture content of the pig manure. Chop the water hyacinth, mix and stir it with the fermented pig manure, keep it moist, and the mass ratio of water hyacinth to pig manure is 3 / 1-1 / 1. Then you can breed it, which is very beneficial for the absorption of nutrients by earthworms;

[0046] Specifically, in S2, pay attention to the fermentation temperature. When the temperature rises to 65°C, turn the pig manure over, lower the temperature and then conduct secondary fermentation to prevent the nutrients from being destroyed. Cover with plastic film during fermentation. When the wine aroma is emitted or white mycelium appears in 12-15 days, you can start breeding.

[0047] S3: Setting up breeding beds: After the pig manure is fermented, it is mixed with water hyacinth, and a fermentation bed of a reasonable area is set up according to the number of earthworms to be raised. The pig manure is placed in the breeding bed and piled into a 30cm manure pile;

[0048] Specifically, in S3, add an appropriate amount of chopped water hyacinth to the manure pile, and rake the manure pile once to promote uniform exposure to the sun. When the manure pile is 60% dry, you can start to put in the earthworm seeds, control the breeding density, and adjust it appropriately according to seasonal changes. For example, you can breed them densely in winter, but reduce the breeding density in summer. After putting in the earthworm seeds, cover them with a layer of shade net or straw to provide shade, moisture and heat preservation. If the earthworms shrink or die abnormally, pay attention to whether the pig manure is not fully fermented. If so, they need to be fermented again.

[0049] S4: Addition of water hyacinth and pig manure: When water hyacinth and pig manure are consumed to a certain extent, they need to be added in time to ensure the normal growth of earthworms and maintain efficient consumption of water hyacinth and pig manure;

[0050] Specifically, in S4, the frequency and amount of adding water hyacinth and pig manure should not be too large, otherwise it will cause too much pressure on the earthworms and affect their growth. In addition, the permeability of the manure pile should be enhanced to improve water retention capacity and ensure the normal growth of earthworms. Normally, the humidity of fresh water hyacinth and pig manure should be maintained above 60%, and they should be piled together for fermentation as backup feed for earthworms.

[0051] S5: Daily management: It is necessary to control the temperature and humidity of the earthworm's growth. The changes in temperature and humidity have a great impact on the growth of earthworms. The pH value of pig manure should be moderate. Too high or too low will inhibit the growth of earthworms. In the high temperature environment in summer, it is necessary to water once a day. The water must not be contaminated and must be watered thoroughly to ensure the normal growth of earthworms.

[0052] Specifically, in S5, the temperature for earthworm growth is 18°C, the lowest cannot be lower than 5°C, and the highest cannot be higher than 30°C, otherwise it will have a great impact on the earthworm, and even cause death in severe cases. The humidity must be controlled at 65%.

[0053] Embodiment 3

[0054] A method for resource utilization of water hyacinth and pig manure and compost preparation thereof comprises the following steps:

[0055] S2: By designing outdoor experiments, different ratios of water hyacinth and manure sources and fermentation conditions were studied, and the optimal raw material ratio and fermentation conditions (time) were screened and obtained. Different ratios of water hyacinth (wet weight) and manure sources (dry weight) were set up: water hyacinth 100%, cow dung 100%, water hyacinth: cow dung = 1:1, water hyacinth: cow dung = 2:1, water hyacinth: cow dung = 3:1, water hyacinth: cow dung = 4:1, and pile fermentation experiments were carried out. During the experiment, the total organic carbon, total nitrogen, C:N, moisture content and other indicators in the fermentation pile were monitored and recorded. The test results of water hyacinth (wet weight) and manure sources (dry weight) with different formulas are shown in Table 1. The total dissolved carbon content, organic carbon content, total combined nitrogen and C:N value of water hyacinth under wet seeding are significantly lower than those of pure cow dung. These data can provide a reference for setting different proportions of formulas according to the nutritional needs of earthworm farming in the subsequent development.

[0056]

[0057] Table 1: Index detection of treatment groups with different ratios of water hyacinth (wet weight) and feces (dry weight)

[0058] Embodiment 4

[0059] A method for resource utilization of water hyacinth and pig manure and compost preparation thereof comprises the following steps:

[0060] S5: By evaluating the conversion efficiency of biomass carbon in earthworm farming, including earthworm production, soil carbon storage, etc., data support is provided for carbon sinks in earthworm farming. The biomass of "water hyacinth + manure source" may be converted into three parts: one is converted into gaseous CO2 and diffused into the atmosphere; the second is absorbed by artificial earthworm farming; and the third is soil carbon fixation.

[0061] 1) After the earthworm breeding cycle is over, three parts of data are collected to evaluate the conversion efficiency of biomass carbon. Among them, the CO2 emission needs to be captured with the help of a greenhouse gas static box and then measured using a greenhouse gas analyzer or gas chromatography; the carbon content in the soil needs to be measured by a total carbon analyzer; and finally, the conversion of earthworms is calculated by weighing the net weight of the earthworms.

[0062] 2) Calculation of carbon sinks:

[0063] Biomass carbon conversion efficiency = (biomass of earthworm + carbon fixation in soil) ÷ total carbon in water hyacinth and manure fermentation products × 100%.

[0064] Carbon sink = (carbon emissions - carbon sink) ÷ earthworm breeding cycle (days)

[0065] =(Carbon emissions - biomass of earthworms - carbon fixation in the soil) ÷ earthworm breeding cycle (days).

[0066] Through the evaluation of the above method, in this embodiment, it is determined that the optimal mass ratio of water hyacinth and manure source in the Minjiang River Basin is 3 / 1-1 / 1, and the most efficient fermentation time for biomass conversion is 12-15 days.

[0067] Embodiment 5

[0068] A method for resource utilization of water hyacinth and pig manure and compost preparation thereof comprises the following steps:

[0069] S6: After the water hyacinth and pig manure are fully transformed and decomposed in the earthworm breeding process, the earthworms are promptly removed from the breeding beds, and the earthworm castings and remaining waste are collected and dried for use in preparing compost.

[0070] 1) Use of earthworm cultivation compost: A peanut planting experiment was set up based on local conditions to use earthworm cultivation compost instead of chemical fertilizers. The control group: fertilized according to the farmers' daily fertilization plan, and the treatment group: fertilized according to the compost application plan of 1,000 kg per mu. The experimental area was one mu each. Both treatments were applied by broadcasting, once during the first land preparation, and no more fertilization was done during the period. Other farming systems were carried out normally without any difference.

[0071] 2) Sample collection: 4 months after peanut planting, soil samples were collected during the peanut pod stage. When collecting, a soil drill was inserted into the pile 30-40 cm to take out the sample, and the organic matter, inorganic carbon, total nitrogen (TN), and C:N were measured. The soil test results are shown in Table Figure 3 As shown. The results show that compared with the control group, the use of the earthworm cultivation compost (experimental group) of the present invention significantly increased the content of soil dissolved organic matter, inorganic carbon, total carbon, and total nitrogen (TN). Among them, the total carbon content of the soil increased by an average of 56%, and the total carbon and nitrogen content of the soil increased by an average of 24%. The soil C:N of the control group was 8.5:1, and the soil C:N of the experimental group was 10.7:1, indicating that the use of the earthworm cultivation compost of the present invention significantly improved the carbon sequestration capacity and fertility of the soil.

[0072] It should be specifically explained that: in order to solve the problems of "low added value" and "low ecological and social benefits" in the resource utilization of water hyacinth, the ecological breeding technology and application of water hyacinth earthworms are developed to improve the recycling efficiency of water hyacinth biomass, replace the traditional incineration or fermentation of biogas, and meet the requirements of low-carbon energy conservation and environmental protection; earthworm breeding can improve the soil environment and increase soil carbon sinks. Earthworms can also be used as high-end open-mouthed bait with high ecological and economic benefits. Earthworms have high nutritional value. Dried earthworms contain 66.3%-72% crude protein, 7.9% fat, and 14.2% carbohydrates, which can replace high-protein feeds such as fish meal. Earthworms grow fast and have a long lifespan, with an annual reproduction rate of 1500-2000 times. It has strong adaptability, is easy to raise, and has relatively mature breeding technology. Water hyacinths, crop straw, human and animal feces, and organic biomass from residual activated sludge from sewage treatment plants can all be used as food sources for earthworms. Taking advantage of the characteristics of earthworms' saprophytic nature and wide diet, water hyacinth and other biomass can be used as earthworm feed after certain processing. Through the digestion, metabolism and intestinal extrusion of the earthworms, the earthworms can be increased in value and vermicompost with good biochemical properties can be produced. It can be said that the application potential of earthworm composting technology is huge.

[0073] It should be noted that: the present invention is based on the ecological breeding technology of "water hyacinth and pig manure" earthworms. While achieving stabilization, reduction and harmlessness, it obtains earthworm manure and earthworm products with high added value. The water hyacinth earthworm breeding technology developed realizes the dual resource utilization of water hyacinth and feces, replaces the traditional incineration or fermentation of biogas, effectively reduces the carbon emissions in the process of water hyacinth treatment, and meets the requirements of low-carbon energy saving and environmental protection. Using earthworms to treat water hyacinths is not only simple in process and does not require special equipment, but also can obtain high-protein feed earthworms and high-quality organic compost earthworm manure. Earthworm breeding can improve the soil environment and increase the soil carbon sink potential. By evaluating the biomass carbon conversion efficiency, including the yield of earthworms, soil carbon reserves, etc., it provides data support for the carbon sink of earthworm breeding, and helps achieve the goals of carbon peak and carbon neutrality. This technology can provide advanced technical support for the future resource utilization of water hyacinths, and find new ways to solve the resource utilization problem of water hyacinths.

[0074] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be considered exemplary and non-restrictive in all respects, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims be included in the present invention.

[0075] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A method for resource utilization of water hyacinth and pig manure and compost preparation thereof, characterized in that: The following steps are involved: S1: Site selection and layout: The breeding sites for earthworms are selected in forests or fields. In terms of site layout, the site should be equipped with water spraying equipment and sunshade nets to prevent the soil from being too dry due to the hot weather in summer. Grape vegetables and fruit plants can also be planted to provide shade. In addition, drainage ditches should be set up to prevent earthworms from being soaked or submerged for a long time during the rainy season or rainstorms. S2: Crushing water hyacinth and fermenting pig manure: First, ferment the pig manure, use feces fermentation agent to mix into the pig manure, control the moisture at 65%, and ferment according to the original moisture content of the pig manure. Chop the water hyacinth, mix and stir it with the fermented pig manure, keep it moist, and the mass ratio of water hyacinth to pig manure is 3 / 1-1 / 1. Then you can breed it, which is very beneficial for the absorption of nutrients by earthworms; S3: Setting up breeding beds: After the pig manure is fermented, it is mixed with water hyacinth, and a fermentation bed of a reasonable area is set up according to the number of earthworms to be raised. The pig manure is placed in the breeding bed and piled into a 30cm manure pile; S4: Addition of water hyacinth and pig manure: When water hyacinth and pig manure are consumed to a certain extent, they need to be added in time to ensure the normal growth of earthworms and maintain efficient consumption of water hyacinth and pig manure; S5: Daily management: The temperature and humidity of the earthworms should be well controlled. The changes in temperature and humidity have a great impact on the growth of earthworms. The pH value of pig manure should be moderate. Too high or too low will inhibit the growth of earthworms. In the high temperature environment in summer, watering is required once a day. The water must not be polluted and must be irrigated thoroughly to ensure the normal growth of earthworms. S6: Compost preparation: After the water hyacinth and pig manure are fully transformed and decomposed in the earthworm breeding process, the earthworms are promptly removed from the breeding beds, and the earthworm castings and remaining waste are collected and dried for use in compost preparation.

2. The method for resource utilization of water hyacinth and pig manure and compost preparation thereof according to claim 1, characterized in that: In S1, the criteria for selecting land are loose, fertile soil with high organic matter content. If it is mountainous land, the bottom of a slope or gravelly land, it is necessary to first use a tiller or rotary tiller to plow or level the soil to keep the soil loose. For fields with uneven soil surfaces, paddy field driven harrow equipment can also be used to level the soil after plowing or rotary tillage.

3. The method for resource utilization of water hyacinth and pig manure and compost preparation thereof according to claim 1, characterized in that: In S2, pay attention to the fermentation temperature. When the temperature rises to 65℃, turn the pig manure over, lower the temperature and then conduct secondary fermentation to prevent the nutrients from being destroyed. Cover with plastic film during fermentation. When the wine aroma is emitted or white mycelium appears in 12-15 days, you can start breeding.

4. The method for resource utilization of water hyacinth and pig manure and compost preparation thereof according to claim 1, characterized in that: In S3, add an appropriate amount of chopped water hyacinth on the manure pile and rake the manure pile once to promote uniform exposure to the sun. When the manure pile is 60% dry, you can start to put in the earthworm seeds. Control the breeding density and adjust it appropriately according to seasonal changes. For example, you can breed them densely in winter and reduce the breeding density in summer. After putting in the earthworm seeds, cover them with a layer of shade net or straw to provide shade, moisture and heat preservation. If the earthworms shrink or die abnormally, pay attention to whether the pig manure is not fully fermented. If so, they need to be fermented again.

5. The method for resource utilization of water hyacinth and pig manure and compost preparation thereof according to claim 1, characterized in that: In S4, the frequency and amount of adding water hyacinth and pig manure should not be too large, otherwise it will cause too much pressure on the earthworms and affect their growth. In addition, the permeability of the manure pile should be enhanced to improve water retention capacity and ensure the normal growth of earthworms. Normally, the humidity of fresh water hyacinth and pig manure should be kept above 60%, and they should be piled together for fermentation as backup feed for earthworms.

6. The method for resource utilization of water hyacinth and pig manure and compost preparation thereof according to claim 1, characterized in that: In S5, the temperature for earthworm growth is 18℃, the lowest temperature cannot be lower than 5℃, and the highest temperature cannot be higher than 30℃, otherwise it will have a great impact on the earthworm, and even cause death in severe cases. The humidity should be controlled at 65%.

7. The method for resource utilization of water hyacinth and pig manure and compost preparation thereof according to claim 1, characterized in that: In S5, in order to find the best green and low-carbon resource utilization plan, it is necessary to calculate the conversion efficiency of biocarbon. The energy of water hyacinth and pig manure will be converted into three parts. First, it is converted into gaseous CO2 and diffused into the atmosphere; second, a part is absorbed by artificially cultivated earthworms; third, it flows into the soil with water, and the carbon content of CO2 needs to be captured with the help of a greenhouse gas static box and then measured using a greenhouse gas analyzer; the carbon content in the soil needs to be measured by a total carbon analyzer; finally, the conversion of earthworms is to weigh the dry weight of earthworms, and finally a comprehensive analysis is conducted to find the best raw material ratio and fermentation time of feces and water hyacinth, creating the highest biological conversion efficiency for the recycling of "pig manure and water hyacinth" materials.

8. The method for resource utilization of water hyacinth and pig manure and compost preparation thereof according to claim 1, characterized in that: In S6, after the earthworms are cultured for three months, they are moved out of the culture beds, and the earthworm castings, soil particles and residual waste are collected, dried, bagged and packaged to make compost, which can be used for crop planting or soil improvement and restoration.

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