CN115894133A - Method for preparing farmyard manure by solidifying slurry-like livestock and poultry manure - Google Patents
Method for preparing farmyard manure by solidifying slurry-like livestock and poultry manure Download PDFInfo
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Abstract
The invention discloses a method for preparing farmyard manure by curing slurry-like livestock and poultry manure, which comprises the steps of preparing a cured body from the slurry-like livestock and poultry manure by using a curing agent and preparing the farmyard manure by using the cured body; the curing agent comprises bentonite, portland cement, quicklime, calcium powder, active magnesium oxide, hemihydrate gypsum powder, urea, deodorant, polyacrylamide, attapulgite, plant ash and the like. The solidified body is alkaline, the interior of the solidified body is in an anaerobic state after solidification, partial pathogenic microorganisms and worm eggs can be killed, and the harmless and stable degree of the livestock and poultry manure is improved; part of anions in the curing agent can be combined with cations in the livestock and poultry manure and converted into harmless substances, so that the harm of heavy metals, organic pollutants and the like to the soil is reduced. The method for preparing the farmyard manure is simple to operate, has the advantages of low energy consumption, low equipment investment and low cost compared with the existing organic fertilizer production, and can be suitable for both large-scale farms and small-scale farms.
Description
Technical Field
The invention relates to the technical field of treatment and disposal of poultry manure, in particular to a method for preparing farmyard manure by curing slurry-like poultry manure.
Background
At present, the treatment and disposal modes of the livestock and poultry manure mainly comprise 3 modes of fertilizer treatment, energy regeneration, feed treatment and the like. The method is characterized in that the livestock and poultry manure is fertilized in the most extensive resource treatment mode, the livestock and poultry manure is subjected to direct field returning utilization, compost field returning utilization, organic fertilizer processing and the like, the livestock and poultry manure is subjected to the fertilizer utilization, the soil structure can be effectively improved, the fertilizer usage amount is reduced, and the method has great development potential. With the high importance of the country on the ecological civilization construction, the direct returning utilization is not advocated any more, but the adoption of the aerobic composting technology is recommended, but the aerobic composting technology can face the following problems: the equipment and facilities have large occupied area, long single-batch secondary production time, high product cost and the like, and the aerobic compost is only suitable for relatively dry livestock and poultry manure and is not suitable for livestock and poultry manure with higher water content, the production efficiency of the aerobic compost is also easily limited by seasons and composting modes, and the aerobic compost is not beneficial to the operation of small and medium-sized farms.
The main problem of the utilization of the livestock and poultry manure in a fertilizer mode is the drying problem of the livestock and poultry manure, particularly the thick slurry manure, and in order to ensure the effect of returning the livestock and poultry manure to the field fertilizer, a proper amount of environment-friendly auxiliary materials are added while the livestock and poultry manure is solidified, so that the livestock and poultry manure is prepared into farmyard manure which can be used as fertilizers for ecological farms, grain farmers, vegetable growers and the like.
At present, methods for drying and stabilizing livestock and poultry manure are reported. For example: chinese patent document CN112679066A (application number 202110299402.6) provides a system and a method for evaporating and dewatering livestock and poultry manure, the technology mainly collects the livestock and poultry manure to a manure collecting tank through a sewage suction pump, dry manure and the manure with high water content are respectively transferred to a dry-wet separation shed through an auger and a sewage suction pump, the manure is treated by the dry-wet separation shed and is divided into solid manure and liquid manure, the solid manure is transferred to a fermentation shed for fermentation, the liquid manure is transferred to an evaporation bin for evaporation treatment, the technology mainly reduces the water content of the livestock and poultry manure through air drying and evaporation, and the drying effect is achieved.
Chinese patent document CN112573797A (application No. 202011599528.7) provides a humidity control and transmission system for livestock and poultry manure and an application method thereof, the technology mainly comprises a dehydration transmission belt, an air pump, an air heating box and an air dryer, the livestock and poultry manure is dried and stabilized mainly by air heating and drying, and the system is not suitable for small-scale farm operation.
Chinese patent document CN111631193A (application No. 202010598159.3) discloses an automatic device for realizing rapid reduction and drying treatment of livestock and poultry feces by using hermetia illucens, which utilizes the characteristics of food decay and active heating of hermetia illucens to accelerate the drying and reduction treatment of livestock and poultry feces. The technical content is that the livestock and poultry manure is quickly dried mainly by the heating property of the hermetia illucens.
Chinese patent document CN111330328A (application number 202010162692.5) discloses a solid-liquid separator suitable for various livestock and poultry feces, which adopts sectional type conveying and extrusion to break rotating blades, so that solid matters in the feces are gathered and compressed at the broken gap. In a word, the existing livestock and poultry manure drying and stabilizing technology generally aims at the whole body of livestock and poultry manure and aims to obtain solid livestock and poultry manure.
Therefore, it is an urgent technical problem to be solved by those skilled in the art to provide a safe and reliable method for drying and stabilizing slurry manure with low investment, wide application range and low energy consumption.
Disclosure of Invention
In view of the above, the invention provides a cured farm manure made of slurry livestock and poultry manure and a preparation method thereof.
In order to achieve the purpose, the invention adopts the following technical scheme:
a curing farmyard manure of slurry livestock and poultry manure comprises slurry cow dung, pig manure or biogas residue and biogas slurry obtained after anaerobic fermentation of cow dung and pig manure and an additive;
the additive comprises the following raw materials in parts by weight: 30-40 parts of bentonite, 20-30 parts of portland cement, 10-15 parts of quick lime, 10-15 parts of calcium powder, 5-10 parts of active magnesium oxide, 5-8 parts of semi-hydrated gypsum powder, 1-2 parts of urea, 1-1.5 parts of deodorant, 0.01-0.05 part of polyacrylamide, 0-15 parts of attapulgite
The invention also provides a method for preparing farmyard manure by solidifying the slurry livestock and poultry manure, which comprises the following steps:
(1) Weighing the slurry livestock and poultry manure and an additive, then treating the slurry livestock and poultry manure by using an original farm manure storage pool as a construction site until the solid content of the slurry livestock and poultry manure is more than or equal to 7.5%, and adding attapulgite and plant ash into the slurry livestock and poultry manure;
the additive comprises the following raw materials in parts by weight: 30-40 parts of bentonite, 20-30 parts of Portland cement, 10-15 parts of quick lime, 10-15 parts of calcium powder, 5-10 parts of active magnesium oxide, 5-8 parts of semi-hydrated gypsum powder, 1-2 parts of urea, 1-1.5 parts of deodorant, 0.01-0.05 part of polyacrylamide, 0-15 parts of attapulgite and 0-10 parts of plant ash;
(2) Uniformly mixing bentonite, calcium powder, active magnesium oxide, urea, a deodorant and polyacrylamide to obtain a mixture I, scattering the mixture I into the slurry-like excrement, and uniformly stirring;
(3) Mixing the weighed residual raw materials to obtain a mixture II, scattering the mixture II into the slurry-like feces, and stirring and mixing the mixture II to form a non-flowing slurry-like state;
(4) Digging out sludge-like feces, paving the sludge-like feces in a flat drying yard to form a plane with the thickness of 5-10cm, naturally drying the sludge-like feces, and forming dried sludge-like feces into a massive solid;
(5) Beating the block-shaped solid to be crushed, and mixing the crushed block-shaped solid with a compound fertilizer or a piled and rotten farmyard manure according to the weight ratio of 1-2:1 mass ratio to obtain the slurry livestock and poultry manure solidified farmyard manure.
The invention has the beneficial effects that:
(1) After being solidified, the thick slurry-like excrement can be cleaned in various cleaning modes such as an excavator, manual digging and the like, so that the excrement cleaning problem of an excrement pool of a farm is solved, the thick slurry-like excrement is convenient to store and transport, and the resource utilization of the thick slurry-like excrement is effectively promoted;
(2) After the slurry-like feces is solidified, the decomposition and fermentation of the feces can be effectively prevented, the odor emission of a culture area can be effectively improved, and the environment of people and livestock and the trouble of the culture which disturbs people can be improved;
(3) The solidified and stabilized livestock and poultry manure can be beneficial to resource utilization of the livestock and poultry manure, and the livestock and poultry manure can be directly applied to farmlands and decomposed and utilized in soil, so that the carbon emission flux can be effectively reduced compared with aerobic compost or methane anaerobic treatment.
(4) For small-sized farms, anaerobic fermentation or aerobic composting requires equipment investment and maintenance management, and is difficult to popularize and implement.
Further, the mass ratio of the slurry livestock and poultry manure to the mixed additive is 1.15-0.2;
the beneficial effect of adopting the further scheme is that: above-mentioned scheme can guarantee that pulpiness excrement dirt has the use amount that reduces the mixed addition material when having better solidification effect, and then reduce cost.
Further, the bentonite is sodium bentonite, the moisture content of the bentonite is less than or equal to 8%, and the blue absorption amount is more than or equal to 200g/kg; the proportion of montmorillonite in the bentonite is more than or equal to 65 percent.
The beneficial effect of adopting the above-mentioned further scheme lies in: compared with calcium bentonite, the sodium bentonite adopted by the invention has larger specific surface area and stronger water absorption.
Further, the portland cement is 625 or 625R high-grade cement with the granularity of less than or equal to 200 meshes
The beneficial effect of adopting the further scheme is that: the use of high-grade cement can improve the strength of a cured body while reducing the amount of cement used.
Furthermore, the particle size of the active magnesium oxide is less than or equal to 80 meshes, and the activity value is 80-120.
The beneficial effect of adopting the further scheme is that: adsorbing the odor in the slurry livestock and poultry manure.
Furthermore, the particle size of the semi-hydrated gypsum powder is less than or equal to 80 meshes.
The beneficial effect of adopting the further scheme is that: reduce the free water in the slurry livestock and poultry manure.
Further, the deodorant adopted by the invention is a microbial agent with the effect of inhibiting the propagation of putrefying bacteria in livestock and poultry manure, is a commercially available product, is produced by Jinan Guanlong chemical Limited company, and is named as 'coconut Guanlong', the microbial components of the deodorant are mainly lactic acid bacteria, bacillus, photosynthetic bacteria and the like, and the deodorant has the main effect that the living bacteria generate an antioxidant biological decomposition reaction in the growth and propagation process to inhibit the propagation of the putrefying bacteria.
Further, the drying time in the air-drying step (4) is 24-48h.
The beneficial effect of adopting the above-mentioned further scheme lies in: the slurry-like manure can be solidified in a short time and made into farmyard manure.
The invention has the beneficial effects that:
1. the invention adopts physical and chemical measures of water absorption, drying, mixing, solidification and the like to carry out solidification and stabilization treatment on the pasty livestock and poultry manure, wherein the contained bentonite and polyacrylamide have larger specific surface area and strong water absorption, and can rapidly carry out gel reaction with the moisture in the livestock and poultry manure, thereby reducing the water content of the livestock and poultry manure; the calcium powder and the active magnesium oxide increase the aggregate and lubrication of the mixture, and are beneficial to stirring and uniformly mixing; the addition of the urea and the deodorant is beneficial to inhibiting the fermentation of microorganisms, reducing the generation of odor and optimizing the working environment; hemihydrate gypsum, quicklime and portland cement accelerate the setting of the slurry manure, allowing it to eventually become a solid with higher strength. And meanwhile, the addition of cement, lime and gypsum can make the final solidified body alkaline, so that the decomposition of the solidified body can be further prevented, and the acidification of the soil can be effectively relieved after the solidified body is applied to the soil.
2. The solidified body is alkaline, the interior of the solidified body is in an anaerobic state after solidification, partial pathogenic microorganisms and worm eggs can be killed, and the harmless and stable degree of the livestock and poultry manure is improved; part of anions in the curing agent can be combined with cations in the livestock and poultry manure and converted into harmless substances, so that the harm of heavy metals, organic pollutants and the like to soil is reduced, and the resource utilization of the livestock and poultry manure is safer.
3. The method for preparing the farmyard manure is simple to operate, has the advantages of low energy consumption, low equipment investment and low cost compared with the existing organic fertilizer production, and can be suitable for large-scale farms, small-scale farms and the like.
Drawings
FIG. 1 is a comparative diagram showing the volume increase of the solidified body of the livestock and poultry manure.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without making any creative effort based on the embodiments in the present invention, belong to the protection scope of the present invention.
Example 1
The method for preparing the farmyard manure by solidifying the slurry pig farm manure comprises the following steps:
the selected livestock and poultry manure is pig manure, which is obtained from Changshan Shili farm in Zhejiang Quzhou city in 2021, 11 months and 20 days, and the indexes are as follows: the solid content is 7.61%, the water content is 92.39%, and the volume weight is 1028kg/m 3 。
(1) Measuring 1 cube of the raw material when the solid content of the slurry livestock and poultry manure is low, and adding 5kg of attapulgite and 5kg of plant ash to stir uniformly for later use;
(2) Weighing 30kg of bentonite, 10kg of calcium powder, 5kg of active magnesium oxide, 1kg of urea, 1kg of deodorant and 10g of polyacrylamide, uniformly mixing to obtain a mixture I, weighing 10kg of the mixture I, scattering the mixture I into slurry-like feces, and uniformly stirring.
(3) Weighing 20kg of Portland cement, 15kg of quicklime and 8kg of semi-hydrated gypsum powder, uniformly mixing to obtain a mixture II, weighing 8kg of the mixture II, scattering the mixture II into a treatment tank, and stirring and mixing the mixture II with slurry-like feces to obtain slurry without fluidity.
(4) Digging out the sludge-like manure obtained in the step (3), paving the sludge-like manure into a plane shape of 5-10cm in a flat airing field, naturally airing and drying for 24h, and enabling the dried sludge-like manure to be a massive solid;
(5) Beating the block-shaped solid obtained in the step (4) to be broken, and mixing the broken block-shaped solid with the piled farmyard manure according to the proportion of 1:1 mass ratio, and sieving with a sieve with 2cm aperture to obtain the final product.
Example 2
The method for preparing the farmyard manure by curing the slurry biogas residue and biogas slurry comprises the following steps:
the implementation place is as follows: zhejiang ecological animal husbandry limited company selects biogas residues and biogas slurry after treatment of manure and sewage in a cattle farm, and the indexes are as follows: the solid content is 9.87%, the water content is 90.13%, and the volume weight is 924kg/m 3 。
(1) Measuring 1 cube of the raw material when the solid content of the slurry livestock and poultry manure is low, and adding 5kg of attapulgite and 5kg of plant ash to stir uniformly for later use;
(2) Weighing 30kg of bentonite, 10kg of calcium powder, 5kg of active magnesium oxide, 1kg of urea, 1kg of deodorant and 10g of polyacrylamide, uniformly mixing to obtain a mixture I, weighing 10kg of the mixture I, scattering the mixture I into slurry-like feces, and uniformly stirring.
(3) Weighing 20kg of Portland cement, 15kg of quicklime and 8kg of semi-hydrated gypsum powder, uniformly mixing to obtain a mixture II, weighing 8kg of the mixture II, scattering the mixture II into a treatment tank, and stirring and mixing the mixture II with slurry-like feces to obtain slurry without fluidity.
(4) Digging out the sludge-like manure obtained in the step (3), paving the sludge-like manure into a plane shape of 5-10cm in a flat airing field, naturally airing and drying for 24h, and enabling the dried sludge-like manure to be a massive solid;
(5) Beating the block-shaped solid obtained in the step (4) to be broken, and mixing the broken block-shaped solid with the piled farmyard manure according to the proportion of 1:1 mass ratio, and sieving with a sieve with 2cm aperture to obtain the final product.
Example 3
A method for preparing a special fertilizer for tea trees by solidifying cattle farm excrement,
the method utilizes the dairy farm excrement of Zhejiang scene ecological animal husbandry Limited company, the solid content of the dairy farm excrement is 8.53 percent, and the method comprises the following specific steps:
(1) Weighing 1 cube of raw materials, adding 5kg of attapulgite and 5kg of plant ash, and uniformly stirring for later use;
(2) Weighing 33kg of bentonite, 10kg of calcium powder, 5kg of active magnesium oxide, 1kg of urea, 1kg of deodorant and 10g of polyacrylamide, uniformly mixing to obtain a mixture I, weighing 10kg of the mixture I, scattering the mixture I into slurry-like feces, and uniformly stirring.
(3) Weighing 20kg of Portland cement, 15kg of quicklime and 8kg of semi-hydrated gypsum powder, uniformly mixing to obtain a mixture II, weighing 8kg of the mixture II, scattering the mixture II into a treatment tank, and stirring and mixing the mixture II with slurry-like feces to obtain slurry without fluidity.
(4) Digging out the sludge-like fecal sewage obtained in the step (3), laying the sludge-like fecal sewage into a plane shape of 5-10cm in a flat airing field, naturally airing and drying for 24 hours, and forming the dried sludge-like fecal sewage into block-shaped solid;
(5) And (3) beating and crushing the block-shaped solid obtained in the step (4) to obtain 270kg of powdery solid with the water content of 33.24%, adding 50kg of urea, 60kg of diammonium phosphate and 70kg of potassium sulfate, and uniformly mixing to obtain the tea tree special fertilizer with 25% of total nitrogen, phosphorus and potassium nutrients and 9-7-9% of total nitrogen, phosphorus and potassium contents, wherein the recommended dosage per mu is 50kg, and the tea tree special fertilizer is suitable for tea gardens in southern hilly mountain areas.
Comparative example 1
The livestock and poultry manure is dried and dried under natural conditions, no curing agent is added, and the selected livestock and poultry manure is pig manure, as described in example 1.
Comparative example 2
And (3) solidifying the poultry manure, wherein the bentonite in the example 1 is removed, and the proportion of other components is kept unchanged. The procedure was also the same as in example 1.
Comparative example 3
And (3) solidifying the poultry manure, wherein the selected solidifying agent is the Portland cement in the example 1, and the proportion of other components is kept unchanged. The procedure was also the same as in example 1.
Test and Effect
1. Performance testing of products
TABLE 1 variation of Water content
| Time of standing | 12h | 24h | 48h | 72h | 96h |
| Example 1 | 78.41％ | 74.31％ | 59.37％ | 38.47％ | 29.79％ |
| Comparative example 1 | 89.29％ | 86.92％ | 82.96％ | 78.78％ | 74.15％ |
| Comparative example 2 | 77.71％ | 74.22％ | 66.46％ | 54.34％ | 40.07％ |
| Comparative example 3 | 81.28％ | 79.38％ | 69.84％ | 59.23％ | 45.37％ |
As can be seen from the above Table 1, compared with comparative example 1, the water content of the cured livestock and poultry manure in example 1 is reduced by 10.88% after 12 hours, 12.61% after 24 hours, 23.59% after 48 hours, 40.31% after 72 hours, 44.36% after 96 hours, and the water content of the cured livestock and poultry manure after 96 hours is significantly reduced, and the indexes of the water content meet the water content requirement in the agricultural sludge pollutant control Standard (GB 4284-2018). Comparative examples 2 and 3 were inferior to example 1 in the effect, although the water content was also reduced after the addition of the curing agent. The curing agent component in the technology plays a key role in curing the prize-like feces.
The change of the volume-increasing ratio of each treated solidified body is shown in figure 1, and it can be seen from figure 1 that the volume of the cured livestock and poultry manure is obviously reduced, and the volume-increasing ratio of example 1 after being placed for 7-8 days is reduced by 15.37% compared with that of comparative example 1, so that the solidifying method meets the requirement of 'reduction and stabilization' of solid waste resource utilization.
2. Sensory evaluation of curing Effect
The cured product was evaluated organoleptically according to whether it was fluid, the molding condition, and the hardness when pressed with a glass rod, and the evaluation results were presented by way of value assignment. Sensory evaluation values are given in table 2.
TABLE 2 sensory evaluation basis of valuation
The sensory evaluation of the curing effect was carried out at 0h,12h,24h,48h,72h and 96h, respectively, and the evaluation results are shown in Table 3.
TABLE 3 sensory evaluation value-assigning Table
The results show that the livestock and poultry manure can obviously reduce the fluidity after being solidified and solidified, the hardness after being solidified is improved, and the 5 sensory evaluation values of the example 1 are respectively improved by 250 percent, 55.56 percent and 75 percent compared with the comparative examples 1, 2 and 3 after being solidified for 24 hours. After curing for 48h, example 1 has been found to be very resistant and to achieve a good curing effect. It can be seen from the analysis of comparative examples 1, 2 and 3 that the curing effect is poor in a short time without adding bentonite because of the lack of water absorption property of bentonite and the slow hydration reaction of cement, and the curing rate is slow because of the lack of hydration reaction of cement without adding portland cement which can reduce the fluidity of animal manure in a short time.
3. Comparison of odor caused by static decay
The cured animal manure was sampled and placed in a small bottle with a height of about 15cm and a radius of about 2cm, and the odor in the small bottle was evaluated every 3d,7d,14d, 28d.
The odor index adopts a six-grade classification method: i: no odor, II: odor was barely perceived, iii: weak odor, iv: noticeable odor, v: strong odor. VI: a very strong odour. Results obtained by inviting 5 experts to evaluate the odor generated by the livestock and poultry feces are shown in table 4.
TABLE 4 comparison of odor generation due to still standing decay
The result shows that the odor of the solidified livestock and poultry manure is obviously reduced, and the odor is basically not generated after one week, the comparative example 1 shows that the odor still has larger odor in a short time without a curing agent, which indicates that the deodorant can play a good role in controlling the odor in a short time, so that the addition of the deodorant can obviously inhibit the generation of the odor, and is necessary in production. The cured livestock and poultry manure can be stored for a long time, and the problem of air pollution in the treatment and storage processes of the livestock and poultry manure is solved.
4. Economic benefit analysis of curing agent
According to the experimental conditions of the livestock and poultry manure composite curing agent, 4 tons of livestock and poultry manure is prepared and cured, so that the cost for curing the livestock and poultry manure is calculated. According to the China supplier network, the China building material purchasing network and other websites, the market reference prices of all materials are found as shown in the table:
TABLE 4 statement of prices of curing agents for animal dung
The curing agent in the embodiment I can cure 4 tons of livestock and poultry manure approximately, and the price of curing each ton of livestock and poultry manure is calculated to be approximately 97.84 yuan, so that the curing agent has certain economic benefit for subsequent resource utilization.
Test example 1
In order to verify the application effect of the farmyard manure in example 1, an application effect test was performed on the cultivation of ecological grazing tomatoes in Shaoxing city, zhejiang province, wherein treatment 1 is a test effect without applying any fertilizer, treatment 2 is a test effect with applying a certain brand of chemical fertilizer, treatment 3 is the farmyard manure prepared in example 1, and the application rates are 5000kg/hm 2 . The results of tomato production in the trial are shown in table 5.
TABLE 5 Effect of farmyard manure prepared by solidification of slurry-like livestock and poultry manure on tomato growth and yield
As can be seen from table 5, after the farmyard manure of the present invention was applied, the yield increased by 91.71%, the plant height increased by 28.63%, the stem thickness increased by 77.14%, and the plant biomass increased by 77.05, compared to tomatoes which had not been applied with any fertilizer. Compared with tomatoes applied with certain chemical fertilizers, the yield is increased by 13.30%, the plant height is increased by 14.47%, the stem thickness is increased by 28.28%, and the plant biomass is increased by 25.58%. This indicates that the farmyard manure can effectively promote the yield increase of tomatoes and has a remarkable effect.
Test example 2
Test example 2 application tests of potato yield and quality in Zhejiang Shaoxing-one-scene ecological husbandry were carried out, and treatment 1 and treatment 2 were the same as test example 1, and treatment 3 was the farmyard manure prepared in example 3, and the application rate was 5000kg/hm 2 . The results of potato yield in the test are shown in table 6.
TABLE 6 influence of farmyard manure prepared by solidification of slurry-like livestock and poultry manure on potato yield and quality
As can be seen from table 6, after the application of the farmyard manure of the present invention, the yield was increased by 161.52% compared to the potatoes without any fertilizer application and by 11.9% compared to the potatoes with a certain fertilizer application. This indicates that improving farmyard manure can effectively promote the yield increase of potatoes. The potato yield was also significantly improved for treatment 3 compared to treatment 1 and treatment 2, indicating that the farmyard manure also significantly improved the quality of the potatoes.
Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.
Claims (7)
1. A method for preparing farmyard manure by curing slurry livestock and poultry manure is characterized by comprising the following steps:
(1) Weighing the slurry livestock and poultry manure and an additive, then treating the slurry livestock and poultry manure by using an original farm manure storage pool as a construction site until the solid content of the slurry livestock and poultry manure is more than or equal to 7.5%, and adding attapulgite and plant ash into the slurry livestock and poultry manure;
the additive comprises the following raw materials in parts by weight: 30-40 parts of bentonite, 20-30 parts of Portland cement, 10-15 parts of quick lime, 10-15 parts of calcium powder, 5-10 parts of active magnesium oxide, 5-8 parts of semi-hydrated gypsum powder, 1-2 parts of urea, 1-1.5 parts of deodorant, 0.01-0.05 part of polyacrylamide, 0-15 parts of attapulgite and 0-10 parts of plant ash;
(2) Uniformly mixing bentonite, calcium powder, active magnesium oxide, urea, a deodorant and polyacrylamide to obtain a mixture I, scattering the mixture I into the slurry-like excrement, and uniformly stirring;
(3) Mixing the weighed residual raw materials to obtain a mixture II, scattering the mixture II into the slurry-like feces, and stirring and mixing the mixture II to form a non-flowing slurry-like state;
(4) Digging out sludge-like feces, paving the sludge-like feces in a flat drying yard to form a plane with the thickness of 5-10cm, naturally drying the sludge-like feces, and forming dried sludge-like feces into a massive solid;
(5) Beating the massive solid into pieces, mixing the pieces with compound fertilizer or composted farmyard manure according to the proportion of 1-2:1, mixing to obtain the slurry livestock and poultry manure solidified farmyard manure.
2. The method for preparing the farmyard manure by solidifying the slurry-like livestock and poultry manure according to claim 1, wherein the mass ratio of the slurry-like livestock and poultry manure to the additives is 1;
the slurry livestock and poultry manure is biogas residue and biogas slurry obtained after anaerobic fermentation of cow manure and/or pig manure.
3. The method for preparing the farmyard manure by curing the slurry livestock and poultry manure according to claim 1, wherein the bentonite is sodium bentonite, the moisture content of the bentonite is less than or equal to 8%, and the blue absorption amount is more than or equal to 200g/kg; the proportion of montmorillonite in the bentonite is more than or equal to 65 percent.
4. The method for preparing farmyard manure by solidifying slurry-like livestock and poultry manure according to claim 1, wherein the portland cement is 625 or 625R high-grade cement with a particle size of 200 mesh or less.
5. The method for preparing farmyard manure by solidifying slurry livestock and poultry manure according to claim 1, wherein the particle size of the active magnesium oxide is not more than 80 meshes, and the activity value is 80-120.
6. The method for preparing the farmyard manure by solidifying the slurry livestock and poultry manure according to claim 1, wherein the semi-hydrated gypsum powder has a particle size of less than or equal to 80 meshes.
7. The method for preparing farmyard manure by curing slurry livestock and poultry manure according to claim 1, wherein the drying time in the air-drying process in the step (4) is 24-48h.
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