Process for producing composite slow-release organic fertilizer based on comprehensive utilization of livestock and poultry breeding wastewater

Abstract

The invention discloses a process for producing a composite slow-release organic fertilizer based on comprehensive utilization of livestock and poultry breeding wastewater. The process comprises the following steps: a, feeding livestock and poultry manure into a biogas digester for anaerobic fermentation treatment; b, carrying out solid-liquid separation; c, adding crushed agricultural and forestry wastes, and continuing fermentation treatment; d, adding magnesium sulfate or magnesium oxide into the filtrate obtained in the step c to adjust the pH value of the system, adding excessive phosphate, stirring, standing and precipitating magnesium ammonium phosphate, and remaining wastewater; e, circulating the treated wastewater for pig house flushing; f, adding magnesium ammonium phosphate into the first solid component to obtain a composite slow-release organic fertilizer; and g, carrying out compound fermentation on the second solid component to obtain the livestock animal or insect feed. Through a series of treatment on waste water such as excrement and urine in the livestock and poultry farm, the magnesium ammonium phosphate product can be recycled, the treated waste water can be used for flushing the pig house, and the cyclic utilization degree of water resources is effectively improved.

Description

Technical Field

[0001] The invention belongs to the technical field of organic fertilizers, and in particular is used for a process for producing composite slow-release organic fertilizers based on comprehensive utilization of livestock and poultry breeding wastewater. Background Art

[0002] At present, in livestock and poultry farms, the treatment of wastewater such as feces and urine is an urgent problem to be solved. Common environmental protection treatment methods are mainly the following:

[0003] 1. Treating feces and urine as fertilizer: The best way to use feces and urine is to return them to the fields as fertilizer, which can not only improve the soil, but also increase crop yields, produce pollution-free green food, and promote a virtuous cycle of agriculture and the combination of agriculture and animal husbandry. Generally, feces can be used as fertilizer after natural composting or high-temperature treatment, but the utilization rate of liquids such as urine is not high.

[0004] 2. Produce biogas: By building a biogas tank, anaerobic microorganisms decompose carbon-containing organic matter in sewage to produce biogas, which can be used for lighting or as fuel. Although the sludge liquid can be used as fertilizer, the liquid fertilizer content is low and its scope of use is limited.

[0005] 3. Treatment of feces and sewage: Common methods include using biofilters, biorotors and activated sludge to treat wastewater through sedimentation and microbial fermentation to meet discharge or utilization requirements. However, resources cannot be recycled.

[0006] In summary, although traditional treatment methods have solved the problems of wastewater and feces treatment to a certain extent, there are still many shortcomings in treatment efficiency, resource utilization and wastewater recycling, especially in controlling ammonia nitrogen, COD (chemical oxygen demand) and heavy metal pollution.

[0007] Therefore, the present invention solves the corresponding problems by providing a process for producing composite slow-release organic fertilizer based on comprehensive utilization of livestock and poultry breeding wastewater. Summary of the invention

[0008] The purpose of the present invention is to provide a process for producing composite slow-release organic fertilizer based on comprehensive utilization of livestock and poultry breeding wastewater, so as to solve the deficiencies in the prior art.

[0009] The technical solution adopted by the present invention is as follows:

[0010] A process for producing composite slow-release organic fertilizer based on comprehensive utilization of livestock and poultry breeding wastewater, comprising the following steps:

[0011] a. Put livestock and poultry manure and urine into the biogas digester for anaerobic fermentation to produce biogas, collect and utilize the biogas, and keep the fermentation liquid;

[0012] b. using a filter press to separate the fermentation broth into solid and liquid to obtain a liquid component and a first solid component;

[0013] c. Add crushed agricultural and forestry wastes such as straw to the liquid component for further fermentation to produce biogas, which is then collected and utilized. After the fermentation is completed, the liquid component is subjected to filter pressing to obtain a filtrate and a second solid component;

[0014] d. Add magnesium sulfate or magnesium oxide to the filtrate obtained in c to adjust the pH value of the system to be stable at 6.5-7, add excess phosphate, stir and mix for 30 minutes, let stand to precipitate magnesium ammonium phosphate, filter and collect magnesium ammonium phosphate, and retain the wastewater;

[0015] e. The wastewater obtained is treated and then recycled for pig house flushing;

[0016] f. adding magnesium ammonium phosphate to the first solid component to obtain a composite slow-release organic fertilizer;

[0017] g. The second solid component is subjected to complex fermentation to obtain livestock or insect feed.

[0018] As a further technical solution: in step a, the anaerobic fermentation treatment of livestock and poultry manure into the biogas digester is specifically as follows:

[0019] Add livestock and poultry manure to the biogas digester, adjust the pH to 5.5, then add distiller's grains to the livestock and poultry manure, stir and mix evenly, and perform closed fermentation for 30-35 days;

[0020] Among them, stirring is carried out every 5-6 days;

[0021] Among them, the stirring speed is 150r / min each time;

[0022] The stirring time for each time is 30 min.

[0023] As a further technical solution: in step c, crushed straw and other agricultural and forestry wastes are added to the liquid component to continue the fermentation process:

[0024] Add crushed agricultural and forestry waste to the liquid component at a mass ratio of 1:2-3;

[0025] Continue the fermentation process to anaerobic fermentation, adjust the pH to 5.5, and ferment anaerobicly for 20-25 days;

[0026] Stir once every 3-4 days, and each stirring time is 10 minutes.

[0027] As a further technical solution: the agricultural and forestry waste includes one or more of wheat straw, corn straw, rice husk, edible fungus matrix, pharmaceutical residues, tree branches and leaves, sawdust, straw, wood shavings, fruit peels and oil cakes.

[0028] As a further technical solution: in step d, the phosphate is sodium dihydrogen phosphate or trisodium phosphate.

[0029] As a further technical solution: in step d, the excess phosphate is added in a ratio of at least 10:3.

[0030] As a further technical solution: the wastewater in step e is treated as follows:

[0031] Disinfection and sterilization of wastewater;

[0032] First, add polyferric sulfate to the wastewater to adjust the pH value to 7, then pump it to a static tank through a venturi tube, add hydrogen peroxide, stir and stabilize for 4-5 hours, and then treat the wastewater with ultraviolet light for 1-1.5 hours;

[0033] Among them, the mass concentration of hydrogen peroxide is 5%;

[0034] The wastewater is treated with ultraviolet light at a wavelength of 253.7 nm for 6-8 hours.

[0035] As a further technical solution: in step f, magnesium ammonium phosphate is added to the first solid component and granulated by a granulator to obtain a composite slow-release organic fertilizer.

[0036] As a further technical solution: the second component is fermented to obtain livestock or insect feed, including:

[0037] First, the wine lees and water are mixed together, the temperature is adjusted to 45°C, and the mixture is stirred for 10 minutes to obtain wine lees slurry;

[0038] Adding a composite enzyme to the wine lees slurry, stirring and mixing evenly, and performing heat preservation enzymolysis treatment for 2 hours to obtain a pretreated wine lees slurry;

[0039] Add the pretreated wine lees slurry to the second component, continue to stir and mix evenly, then add EM bacterial powder, stir and mix evenly, ferment for 30 days in multiple stages, and then dry until the moisture content is less than 10%, bag and vacuum seal.

[0040] The mixing mass ratio of the vinasse to water is 1:3-4;

[0041] The mixing mass ratio of the vinasse slurry to the complex enzyme is 100:3;

[0042] The complex enzyme is a mixture of cellulase and hemicellulase;

[0043] The mixing mass ratio of the cellulase to the hemicellulase is 2:1.

[0044] As a further technical solution: the vinasse slurry is added to the pretreated vinasse slurry at a mass ratio of 1:15-18;

[0045] The mass ratio of EM bacterial powder to pretreated wine lees slurry is 1:50-60;

[0046] The multi-stage fermentation was performed at 25°C, 28°C and 30°C for 5 days, 10 days and 15 days respectively.

[0047] Beneficial effects:

[0048] The present invention treats wastewater such as manure and urine in livestock and poultry farms through a series of treatments, which can not only recover magnesium ammonium phosphate products and biogas, and can sell them as by-products to improve economic benefits, but also can use the treated wastewater to flush pig houses, effectively improving the recycling rate of water resources, and can also obtain composite slow-release organic fertilizer, which has high economic benefits and meets the current green environmental protection theme.

[0049] The composite slow-release organic fertilizer prepared by the present invention can provide inorganic elements such as nitrogen, phosphorus and potassium required for the growth of crops, and also contains rich organic matter and trace elements, which can meet the nutritional needs of crops at different growth stages and promote the healthy growth of crops.

[0050] The composite slow-release organic fertilizer prepared by the present invention is applied to the land, which can increase the number and activity of soil microorganisms, improve the soil ecological environment, increase soil permeability, improve soil structure, and enhance soil water retention and aeration, thereby promoting the healthy and vigorous growth of crops, shortening the growth cycle, and improving the quality of crops.

[0051] Chemical fertilizers are mostly used in the prior art, and long-term use of chemical fertilizers can easily lead to soil salinization. The present invention does not cause these problems by using a composite slow-release organic fertilizer made from feces and urine in livestock and poultry farms. At the same time, it can also adjust the pH of the soil and reduce salinization, which is beneficial to the growth of crops.

[0052] The composite slow-release organic fertilizer prepared by the present invention releases nutrients more slowly and lasts longer, has a long sustained action time, does not require additional chemical fertilizers, and has a high fertilizer utilization rate.

[0053] By introducing pretreated distiller's grains, the livestock or insect feed prepared by the present invention has richer nutrition. Compared with conventional feed, it is rich in protein, fat, fiber, vitamins, minerals, etc., can provide their nutritional needs, and can improve the production performance of animals and insects, improve intestinal health, shorten the growth cycle, and have greater economic benefits. BRIEF DESCRIPTION OF THE DRAWINGS

[0054] Figure 1It is a statistical diagram of the sweetness of the center of Hami melon in each group of the embodiment. DETAILED DESCRIPTION

[0055] The technical solutions in the embodiments of the present invention are described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0056] The following are specific embodiments

[0057] Example 1

[0058] A process for producing composite slow-release organic fertilizer based on comprehensive utilization of livestock and poultry breeding wastewater, comprising the following steps:

[0059] a. Anaerobic fermentation of livestock and poultry manure into a biogas digester to produce biogas, collect and utilize the biogas, and retain the fermentation liquid; Anaerobic fermentation of livestock and poultry manure into a biogas digester is specifically as follows:

[0060] Add livestock and poultry manure to the biogas digester, adjust the pH to 5.5, then add distiller's grains to the livestock and poultry manure, stir and mix evenly, and perform closed fermentation for 30 days;

[0061] Among them, stirring is carried out every 5 days;

[0062] Among them, the stirring speed is 150r / min each time;

[0063] The stirring time for each time is 30 min.

[0064] b. using a filter press to separate the fermentation broth into solid and liquid to obtain a liquid component and a first solid component;

[0065] c. Add crushed straw and other agricultural and forestry wastes to the liquid component for continued fermentation to produce biogas, which is collected and utilized. After the fermentation is completed, it is subjected to filter pressing to obtain a filtrate and a second solid component; Add crushed straw and other agricultural and forestry wastes to the liquid component for continued fermentation:

[0066] Add crushed agricultural and forestry waste to the liquid component at a mass ratio of 1:2;

[0067] The fermentation treatment was continued to be anaerobic fermentation, the pH was adjusted to 5.5, and the anaerobic fermentation was carried out for 20 days;

[0068] Stir once every 3 days, and each stirring time is 10 minutes.

[0069] Agricultural and forestry wastes include wheat straw, corn straw, rice husks, edible fungus substrates, pharmaceutical residues, tree branches and leaves, sawdust, straw, wood shavings, fruit peels and oil cakes.

[0070] d. Add magnesium sulfate to the filtrate obtained above to adjust the pH value of the system to 6.5, add excess phosphate, stir and mix for 30 minutes, let stand to precipitate magnesium ammonium phosphate, filter and collect the magnesium ammonium phosphate, and retain the waste water; the phosphate is sodium dihydrogen phosphate.

[0071] Excess phosphate is the addition of phosphate in a ratio of at least 10:3.

[0072] e. The wastewater obtained is treated and then recycled for pig house flushing; the wastewater is treated as follows:

[0073] Disinfection and sterilization of wastewater;

[0074] First, polyferric sulfate is added to the wastewater to adjust the pH value to 7, and then hydrogen peroxide is added after being pumped to a static tank through a venturi tube. After stirring and static treatment for 4 hours, the wastewater is then subjected to ultraviolet light treatment for 1 hour.

[0075] Among them, the mass concentration of hydrogen peroxide is 5%;

[0076] The wastewater was treated with ultraviolet light at a wavelength of 253.7 nm for 6 hours.

[0077] f. adding magnesium ammonium phosphate to the first solid component to obtain a composite slow-release organic fertilizer;

[0078] g. The second solid component is subjected to composite fermentation to obtain livestock or insect feed;

[0079] In step f, magnesium ammonium phosphate is added to the first solid component and granulated by a granulator to obtain a composite slow-release organic fertilizer.

[0080] The second component is fermented to obtain livestock or insect feed, including:

[0081] First, the wine lees and water are mixed together, the temperature is adjusted to 45°C, and the mixture is stirred for 10 minutes to obtain wine lees slurry;

[0082] Adding a composite enzyme to the wine lees slurry, stirring and mixing evenly, and performing heat preservation enzymolysis treatment for 2 hours to obtain a pretreated wine lees slurry;

[0083] Add the pretreated wine lees slurry to the second component, continue to stir and mix evenly, then add EM bacterial powder, stir and mix evenly, ferment for 30 days in multiple stages, and then dry until the moisture content is less than 10%, bag and vacuum seal.

[0084] The mixing mass ratio of the vinasse to water is 1:3;

[0085] The mixing mass ratio of the vinasse slurry to the complex enzyme is 100:3;

[0086] The complex enzyme is a mixture of cellulase and hemicellulase;

[0087] The mixing mass ratio of the cellulase to the hemicellulase is 2:1.

[0088] The vinasse slurry is added to the pretreated vinasse slurry in a mass ratio of 1:15;

[0089] The mass ratio of EM bacterial powder to pretreated wine lees slurry was 1:50;

[0090] The multi-stage fermentation was performed at 25°C, 28°C and 30°C for 5 days, 10 days and 15 days respectively.

[0091] Example 2

[0092] A process for producing composite slow-release organic fertilizer based on comprehensive utilization of livestock and poultry breeding wastewater, comprising the following steps:

[0093] a. Anaerobic fermentation of livestock and poultry manure into a biogas digester to produce biogas, collect and utilize the biogas, and retain the fermentation liquid; Anaerobic fermentation of livestock and poultry manure into a biogas digester is specifically as follows:

[0094] Add livestock and poultry manure to the biogas digester, adjust the pH to 5.5, then add distiller's grains to the livestock and poultry manure, stir and mix evenly, and perform closed fermentation for 32 days;

[0095] Among them, stirring is carried out every 5 days;

[0096] Among them, the stirring speed is 150r / min each time;

[0097] The stirring time for each time is 30 min.

[0098] b. using a filter press to separate the fermentation broth into solid and liquid to obtain a liquid component and a first solid component;

[0099] c. Add crushed straw and other agricultural and forestry wastes to the liquid component for continued fermentation to produce biogas, which is collected and utilized. After the fermentation is completed, it is subjected to filter pressing to obtain a filtrate and a second solid component; Add crushed straw and other agricultural and forestry wastes to the liquid component for continued fermentation:

[0100] Add crushed agricultural and forestry waste to the liquid component at a mass ratio of 1:3;

[0101] The fermentation treatment was continued to be anaerobic fermentation, the pH was adjusted to 5.5, and the anaerobic fermentation was continued for 22 days;

[0102] Stir once every 3 days, and each stirring time is 10 minutes.

[0103] Agricultural and forestry wastes include wheat straw, corn straw, rice husks, edible fungus substrates, tree branches and leaves, and sawdust.

[0104] d. Add magnesium sulfate to the filtrate obtained above to adjust the pH value of the system to 6.8, add excess phosphate, stir and mix for 30 minutes, let stand to precipitate magnesium ammonium phosphate, filter and collect the magnesium ammonium phosphate, and retain the waste water; the phosphate is sodium dihydrogen phosphate.

[0105] Excess phosphate is the addition of phosphate in a ratio of at least 10:3.

[0106] e. The wastewater obtained is treated and then recycled for pig house flushing; the wastewater is treated as follows:

[0107] Disinfection and sterilization of wastewater;

[0108] First, polyferric sulfate is added to the wastewater to adjust the pH value to 7, and then hydrogen peroxide is added after being pumped to a static tank through a venturi tube. After stirring and static treatment for 4.5 hours, the wastewater is then subjected to ultraviolet light treatment for 1.2 hours.

[0109] Among them, the mass concentration of hydrogen peroxide is 5%;

[0110] The wastewater was treated with ultraviolet light at a wavelength of 253.7 nm for 7 hours.

[0111] f. adding magnesium ammonium phosphate to the first solid component to obtain a composite slow-release organic fertilizer;

[0112] g. The second solid component is subjected to composite fermentation to obtain livestock or insect feed; in step f, magnesium ammonium phosphate is added to the first solid component and granulated by a granulator to obtain a composite slow-release organic fertilizer.

[0113] The second component is fermented to obtain livestock or insect feed, including:

[0114] First, the wine lees and water are mixed together, the temperature is adjusted to 45°C, and the mixture is stirred for 10 minutes to obtain wine lees slurry;

[0115] Adding a composite enzyme to the wine lees slurry, stirring and mixing evenly, and performing heat preservation enzymolysis treatment for 2 hours to obtain a pretreated wine lees slurry;

[0116] Add the wine lees slurry to the pretreated wine lees slurry, continue to stir and mix evenly, then add EM bacterial powder, stir and mix evenly, ferment for 30 days in multiple stages, and then dry until the water content is less than 10%, bag and vacuum seal; the mass ratio of wine lees to water is 1:3.5;

[0117] The mixing mass ratio of the vinasse slurry to the complex enzyme is 100:3;

[0118] The complex enzyme is a mixture of cellulase and hemicellulase;

[0119] The cellulase and hemicellulase are mixed in a mass ratio of 2:1; the vinasse slurry is added to the pretreated vinasse slurry in a mass ratio of 1:16;

[0120] The mass ratio of EM bacterial powder to pretreated wine lees slurry was 1:55;

[0121] The multi-stage fermentation was performed at 25°C, 28°C and 30°C for 5 days, 10 days and 15 days respectively.

[0122] Example 3

[0123] A process for producing composite slow-release organic fertilizer based on comprehensive utilization of livestock and poultry breeding wastewater, comprising the following steps:

[0124] a. Anaerobic fermentation of livestock and poultry manure into a biogas digester to produce biogas, collect and utilize the biogas, and retain the fermentation liquid; Anaerobic fermentation of livestock and poultry manure into a biogas digester is specifically as follows:

[0125] Add livestock and poultry manure to the biogas digester, adjust the pH to 5.5, then add distiller's grains to the livestock and poultry manure, stir and mix evenly, and perform closed fermentation for 33 days;

[0126] Among them, stirring is carried out every 6 days;

[0127] Among them, the stirring speed is 150r / min each time;

[0128] The stirring time for each time is 30 min.

[0129] b. using a filter press to separate the fermentation broth into solid and liquid to obtain a liquid component and a first solid component;

[0130] c. Add crushed straw and other agricultural and forestry wastes to the liquid component for continued fermentation to produce biogas, which is collected and utilized. After the fermentation is completed, it is subjected to filter pressing to obtain a filtrate and a second solid component; Add crushed straw and other agricultural and forestry wastes to the liquid component for continued fermentation:

[0131] Add crushed agricultural and forestry waste to the liquid component at a mass ratio of 1:2.5;

[0132] The fermentation treatment was continued to be anaerobic fermentation, the pH was adjusted to 5.5, and the anaerobic fermentation was carried out for 24 days;

[0133] Stir once every 4 days, and each stirring time is 10 minutes.

[0134] Agricultural and forestry wastes include wheat straw, corn straw, rice husks, and edible fungus substrates.

[0135] d. Add magnesium oxide to the filtrate obtained above to adjust the pH value of the system to 6.6, add excess phosphate, stir and mix for 30 minutes, let stand to precipitate magnesium ammonium phosphate, filter and collect the magnesium ammonium phosphate, and retain the waste water; the phosphate is trisodium phosphate.

[0136] Excess phosphate is the addition of phosphate in a ratio of at least 10:3.

[0137] e. The wastewater obtained is treated and then recycled for pig house flushing; the wastewater is treated as follows:

[0138] Disinfection and sterilization of wastewater;

[0139] First, polyferric sulfate was added to the wastewater to adjust the pH value to 7, and then hydrogen peroxide was added after being pumped to a static tank through a venturi tube. After stirring and static treatment for 5 hours, the wastewater was then subjected to ultraviolet light treatment for 1.3 hours.

[0140] Among them, the mass concentration of hydrogen peroxide is 5%;

[0141] The wastewater was treated with ultraviolet light at a wavelength of 253.7 nm for 7 hours.

[0142] f. adding magnesium ammonium phosphate to the first solid component to obtain a composite slow-release organic fertilizer;

[0143] g. The second solid component is subjected to composite fermentation to obtain livestock or insect feed; in step f, magnesium ammonium phosphate is added to the first solid component and granulated by a granulator to obtain a composite slow-release organic fertilizer.

[0144] The second component is fermented to obtain livestock or insect feed, including:

[0145] First, the wine lees and water are mixed together, the temperature is adjusted to 45°C, and the mixture is stirred for 10 minutes to obtain wine lees slurry;

[0146] Adding a composite enzyme to the wine lees slurry, stirring and mixing evenly, and performing heat preservation enzymolysis treatment for 2 hours to obtain a pretreated wine lees slurry;

[0147] Add the wine lees slurry to the pretreated wine lees slurry, continue to stir and mix evenly, then add EM bacterial powder, stir and mix evenly, ferment for 30 days in multiple stages, and then dry until the water content is less than 10%, bag and vacuum seal; the mass ratio of wine lees to water is 1:3.5;

[0148] The mixing mass ratio of the vinasse slurry to the complex enzyme is 100:3;

[0149] The complex enzyme is a mixture of cellulase and hemicellulase;

[0150] The cellulase and hemicellulase are mixed in a mass ratio of 2:1; the vinasse slurry is added to the pretreated vinasse slurry in a mass ratio of 1:16;

[0151] The mass ratio of EM bacterial powder to pretreated wine lees slurry was 1:54;

[0152] The multi-stage fermentation was performed at 25°C, 28°C and 30°C for 5 days, 10 days and 15 days respectively.

[0153] Example 4

[0154] A process for producing composite slow-release organic fertilizer based on comprehensive utilization of livestock and poultry breeding wastewater, comprising the following steps:

[0155] a. Anaerobic fermentation of livestock and poultry manure into a biogas digester to produce biogas, collect and utilize the biogas, and retain the fermentation liquid; Anaerobic fermentation of livestock and poultry manure into a biogas digester is specifically as follows:

[0156] Add livestock and poultry manure to the biogas digester, adjust the pH to 5.5, then add distiller's grains to the livestock and poultry manure, stir and mix evenly, and perform closed fermentation for 34 days;

[0157] Among them, stirring is carried out every 6 days;

[0158] Among them, the stirring speed is 150r / min each time;

[0159] The stirring time for each time is 30 min.

[0160] b. using a filter press to separate the fermentation broth into solid and liquid to obtain a liquid component and a first solid component;

[0161] c. Add crushed straw and other agricultural and forestry wastes to the liquid component for continued fermentation to produce biogas, which is collected and utilized. After the fermentation is completed, it is subjected to filter pressing to obtain a filtrate and a second solid component; Add crushed straw and other agricultural and forestry wastes to the liquid component for continued fermentation:

[0162] Add crushed agricultural and forestry waste to the liquid component at a mass ratio of 1:2.5;

[0163] The fermentation treatment was continued to be anaerobic fermentation, the pH was adjusted to 5.5, and the anaerobic fermentation was carried out for 24 days;

[0164] Stir once every 4 days, and each stirring time is 10 minutes.

[0165] Agricultural and forestry wastes include wheat straw, rice husks, pharmaceutical residues, rice straw, fruit peels and oil cakes.

[0166] d. Add magnesium oxide to the filtrate obtained above to adjust the pH value of the system to 6.8, add excess phosphate, stir and mix for 30 minutes, let stand to precipitate magnesium ammonium phosphate, filter and collect the magnesium ammonium phosphate, and retain the waste water; the phosphate is sodium dihydrogen phosphate.

[0167] Excess phosphate is the addition of phosphate in a ratio of at least 10:3.

[0168] e. The wastewater obtained is treated and then recycled for pig house flushing; the wastewater is treated as follows:

[0169] Disinfection and sterilization of wastewater;

[0170] First, polyferric sulfate is added to the wastewater to adjust the pH value to 7, and then hydrogen peroxide is added after being pumped to a static tank through a venturi tube. After stirring and static treatment for 4.5 hours, the wastewater is then subjected to ultraviolet light treatment for 1.2 hours.

[0171] Among them, the mass concentration of hydrogen peroxide is 5%;

[0172] The wastewater was treated with ultraviolet light at a wavelength of 253.7 nm for 7 hours.

[0173] f. adding magnesium ammonium phosphate to the first solid component to obtain a composite slow-release organic fertilizer;

[0174] g. The second solid component is subjected to composite fermentation to obtain livestock or insect feed; in step f, magnesium ammonium phosphate is added to the first solid component and granulated by a granulator to obtain a composite slow-release organic fertilizer.

[0175] The second component is fermented to obtain livestock or insect feed, including:

[0176] First, the wine lees and water are mixed together, the temperature is adjusted to 45°C, and the mixture is stirred for 10 minutes to obtain wine lees slurry;

[0177] Adding a composite enzyme to the wine lees slurry, stirring and mixing evenly, and performing heat preservation enzymolysis treatment for 2 hours to obtain a pretreated wine lees slurry;

[0178] Add the wine lees slurry to the pretreated wine lees slurry, continue to stir and mix evenly, then add EM bacterial powder, stir and mix evenly, ferment for 30 days in multiple stages, and then dry until the water content is less than 10%, bag and vacuum seal; the mass ratio of wine lees to water is 1:4;

[0179] The mixing mass ratio of the vinasse slurry to the complex enzyme is 100:3;

[0180] The complex enzyme is a mixture of cellulase and hemicellulase;

[0181] The cellulase and hemicellulase are mixed in a mass ratio of 2:1; the vinasse slurry is added to the pretreated vinasse slurry in a mass ratio of 1:16;

[0182] The mass ratio of EM bacterial powder to pretreated wine lees slurry was 1:54;

[0183] The multi-stage fermentation was performed at 25°C, 28°C and 30°C for 5 days, 10 days and 15 days respectively.

[0184] Example 5

[0185] A process for producing composite slow-release organic fertilizer based on comprehensive utilization of livestock and poultry breeding wastewater, comprising the following steps:

[0186] a. Anaerobic fermentation of livestock and poultry manure into a biogas digester to produce biogas, collect and utilize the biogas, and retain the fermentation liquid; Anaerobic fermentation of livestock and poultry manure into a biogas digester is specifically as follows:

[0187] Add livestock and poultry manure to the biogas digester, adjust the pH to 5.5, then add distiller's grains to the livestock and poultry manure, stir and mix evenly, and perform closed fermentation for 35 days;

[0188] Among them, stirring is carried out every 6 days;

[0189] Among them, the stirring speed is 150r / min each time;

[0190] The stirring time for each time is 30 min.

[0191] b. using a filter press to separate the fermentation broth into solid and liquid to obtain a liquid component and a first solid component;

[0192] c. Add crushed straw and other agricultural and forestry wastes to the liquid component for continued fermentation to produce biogas, which is collected and utilized. After the fermentation is completed, it is subjected to filter pressing to obtain a filtrate and a second solid component; Add crushed straw and other agricultural and forestry wastes to the liquid component for continued fermentation:

[0193] Add crushed agricultural and forestry waste to the liquid component at a mass ratio of 1:3;

[0194] The fermentation treatment was continued to be anaerobic fermentation, the pH was adjusted to 5.5, and the anaerobic fermentation was carried out for 25 days;

[0195] Stir once every 4 days, and each stirring time is 10 minutes.

[0196] Agricultural and forestry wastes include wheat straw, corn straw, rice husks, edible fungus substrates and pharmaceutical residues.

[0197] d. Add magnesium sulfate or magnesium oxide to the filtrate obtained in c to adjust the pH value of the system to 7, add excess phosphate, stir and mix for 30 minutes, let stand to precipitate magnesium ammonium phosphate, filter and collect the magnesium ammonium phosphate, and retain the waste water; the phosphate is sodium dihydrogen phosphate or trisodium phosphate.

[0198] Excess phosphate is the addition of phosphate in a ratio of at least 10:3.

[0199] e. The wastewater obtained is treated and then recycled for pig house flushing; the wastewater is treated as follows:

[0200] Disinfection and sterilization of wastewater;

[0201] First, polyferric sulfate is added to the wastewater to adjust the pH value to 7, and then hydrogen peroxide is added after being pumped to a static tank through a venturi tube. After stirring and static treatment for 5 hours, the wastewater is then subjected to ultraviolet light treatment for 1.5 hours.

[0202] Among them, the mass concentration of hydrogen peroxide is 5%;

[0203] The wastewater was treated with ultraviolet light at a wavelength of 253.7 nm for 8 hours.

[0204] f. adding magnesium ammonium phosphate to the first solid component to obtain a composite slow-release organic fertilizer;

[0205] g. The second solid component is subjected to composite fermentation to obtain livestock or insect feed; in step f, magnesium ammonium phosphate is added to the first solid component and granulated by a granulator to obtain a composite slow-release organic fertilizer.

[0206] The second component is fermented to obtain livestock or insect feed, including:

[0207] First, the wine lees and water are mixed together, the temperature is adjusted to 45°C, and the mixture is stirred for 10 minutes to obtain wine lees slurry;

[0208] Adding a composite enzyme to the wine lees slurry, stirring and mixing evenly, and performing heat preservation enzymolysis treatment for 2 hours to obtain a pretreated wine lees slurry;

[0209] Add the wine lees slurry to the pretreated wine lees slurry, continue to stir and mix evenly, then add EM bacterial powder, stir and mix evenly, ferment for 30 days in multiple stages, and then dry until the water content is less than 10%, bag and vacuum seal; the mass ratio of wine lees to water is 1:4;

[0210] The mixing mass ratio of the vinasse slurry to the complex enzyme is 100:3;

[0211] The complex enzyme is a mixture of cellulase and hemicellulase;

[0212] The cellulase and hemicellulase are mixed in a mass ratio of 2:1; the vinasse slurry is added to the pretreated vinasse slurry in a mass ratio of 1:18;

[0213] The mass ratio of EM bacterial powder to pretreated wine lees slurry was 1:60;

[0214] The multi-stage fermentation was performed at 25°C, 28°C and 30°C for 5 days, 10 days and 15 days respectively.

[0215] Comparative Example 1:

[0216] On the basis of the technical solution of Example 1, the pulverized agricultural and forestry waste is not added and the fermentation treatment is continued, and the other technical solutions remain unchanged.

[0217] Comparative Example 2:

[0218] Based on the technical solution of Example 1, no pretreated wine lees are added, and the rest of the technical solutions remain unchanged.

[0219] test:

[0220] The experimental greenhouses were used, each with an area of ​​5m×30m, with a total of 7 greenhouses;

[0221] Apply basal fertilizer (composite slow-release organic fertilizer of the embodiment and the comparative example) in each area at a rate of 1000 kg per mu;

[0222] Plant cantaloupe seedlings of the same variety with a plant spacing of 35 cm and a row spacing of 80 cm;

[0223] When the plant has 5-6 leaves, set up a trellis to guide the vines, and use the double vine pruning method. When 3-4 true leaves appear, pinch the top, select two strong vines with consistent growth, and remove the rest.

[0224] Artificial pollination during flowering:

[0225] When harvested uniformly, the quality of each group of cantaloupes was compared;

[0226] Table 1

[0227]

[0228]

[0229] It can be seen from Table 1 that the composite slow-release organic fertilizer prepared by the present invention can significantly improve the quality of single Hami melon.

[0230] The center sugar content of the Hami melons in each group of the embodiment and the comparative example was tested:

[0231] Table 2

[0232] Center sugar content % Example 1 15.83 Example 2 15.37 Example 3 15.94 Example 4 16.05 Example 5 15.23 Comparative Example 1 14.12 Comparative Example 2 13.77

[0233] It can be seen from Table 2 that the composite slow-release organic fertilizer prepared by the present invention can improve the central sweetness of Hami melon.

[0234] The present invention illustrates the detailed structural features of the present invention through the above embodiments, but the present invention is not limited to the above detailed structural features, that is, it does not mean that the present invention must rely on the above detailed structural features to be implemented. Those skilled in the art should understand that any improvement of the present invention, equivalent replacement of the components selected by the present invention, addition of auxiliary components, selection of specific methods, etc., all fall within the protection scope and disclosure scope of the present invention.

[0235] The preferred embodiments of the present invention are described in detail above. However, the present invention is not limited to the specific details in the above embodiments. Within the technical concept of the present invention, a variety of simple modifications can be made to the technical solution of the present invention, and these simple modifications all belong to the protection scope of the present invention.

[0236] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, the present invention will not further describe various possible combinations.

[0237] In addition, various embodiments of the present invention may be arbitrarily combined, and as long as they do not violate the concept of the present invention, they should also be regarded as the contents disclosed by the present invention.

Claims

1. A process for producing composite slow-release organic fertilizer based on comprehensive utilization of livestock and poultry breeding wastewater, characterized in that: The following steps are involved: a. Put livestock and poultry manure and urine into the biogas digester for anaerobic fermentation to produce biogas, collect and utilize the biogas, and keep the fermentation liquid; b. using a filter press to separate the fermentation broth into solid and liquid to obtain a liquid component and a first solid component; c. wherein the liquid component is added with crushed agricultural and forestry waste for further fermentation to produce biogas, which is then collected and utilized. After the fermentation is completed, the liquid component is subjected to filter pressing to obtain a filtrate and a second solid component; d. Add magnesium sulfate or magnesium oxide to the filtrate obtained in c to adjust the pH value of the system to be stable at 6.5-7, add excess phosphate, stir and mix for 30 minutes, let stand to precipitate magnesium ammonium phosphate, filter and collect magnesium ammonium phosphate, and retain the wastewater; e. The wastewater obtained is treated and then recycled for pig house flushing; f. adding magnesium ammonium phosphate to the first solid component to obtain a composite slow-release organic fertilizer; g. The second solid component is subjected to complex fermentation to obtain livestock or insect feed.

2. A process for producing composite slow-release organic fertilizer based on comprehensive utilization of livestock and poultry breeding wastewater according to claim 1, characterized in that: In step a, the anaerobic fermentation of livestock and poultry manure into the biogas digester is specifically as follows: Add livestock and poultry manure to the biogas digester, adjust the pH to 5.5, then add distiller's grains to the livestock and poultry manure, stir and mix evenly, and perform closed fermentation for 30-35 days; Among them, stirring is carried out every 5-6 days; Among them, the stirring speed is 150r / min each time; The stirring time for each time is 30 min.

3. A process for producing composite slow-release organic fertilizer based on comprehensive utilization of livestock and poultry breeding wastewater according to claim 2, characterized in that: In step c, the crushed agricultural and forestry waste is added to the liquid component and continued to be fermented as follows: Add crushed agricultural and forestry waste to the liquid component at a mass ratio of 1:2-3; Continue the fermentation process to anaerobic fermentation, adjust the pH to 5.5, and ferment anaerobicly for 20-25 days; Stir once every 3-4 days, and each stirring time is 10 minutes.

4. A process for producing composite slow-release organic fertilizer based on comprehensive utilization of livestock and poultry breeding wastewater according to claim 3, characterized in that: The agricultural and forestry wastes include one or more of wheat straw, corn straw, rice husk, edible fungus matrix, pharmaceutical residues, tree branches and leaves, sawdust, straw, wood shavings, fruit peels and oil cakes.

5. The process for producing composite slow-release organic fertilizer based on comprehensive utilization of livestock and poultry breeding wastewater according to claim 1, characterized in that: In step d, the phosphate is sodium dihydrogen phosphate or trisodium phosphate.

6. A process for producing composite slow-release organic fertilizer based on comprehensive utilization of livestock and poultry breeding wastewater according to claim 5, characterized in that: The excess phosphate in step d is added at a ratio of at least 10:

3.

7. The process for producing composite slow-release organic fertilizer based on comprehensive utilization of livestock and poultry breeding wastewater according to claim 1, characterized in that: In step e, the wastewater is treated to: Disinfection and sterilization of wastewater; First, add polyferric sulfate to the wastewater to adjust the pH value to 7, then pump it to a static tank through a venturi tube, add hydrogen peroxide, stir and stabilize for 4-5 hours, and then treat the wastewater with ultraviolet light for 1-1.5 hours; Among them, the mass concentration of hydrogen peroxide is 5%; The wastewater is treated with ultraviolet light at a wavelength of 253.7 nm for 6-8 hours.

8. The process for producing composite slow-release organic fertilizer based on comprehensive utilization of livestock and poultry breeding wastewater according to claim 1, characterized in that: In step f, magnesium ammonium phosphate is added to the first solid component and granulated by a granulator to obtain a composite slow-release organic fertilizer.

9. A process for producing composite slow-release organic fertilizer based on comprehensive utilization of livestock and poultry breeding wastewater according to claim 8, characterized in that: The second component is fermented to obtain livestock or insect feed, including: First, the wine lees and water are mixed together, the temperature is adjusted to 45°C, and the mixture is stirred for 10 minutes to obtain wine lees slurry; Adding a composite enzyme to the wine lees slurry, stirring and mixing evenly, and performing heat preservation enzymolysis treatment for 2 hours to obtain a pretreated wine lees slurry; Add the pretreated wine lees slurry to the second component, continue to stir and mix evenly, then add EM bacterial powder, stir and mix evenly, ferment for 30 days in multiple stages, and then dry until the moisture content is less than 10%, bag and vacuum seal. The mixing mass ratio of the vinasse to water is 1:3-4; The mixing mass ratio of the vinasse slurry to the complex enzyme is 100:3; The complex enzyme is a mixture of cellulase and hemicellulase; The mixing mass ratio of the cellulase to the hemicellulase is 2:

1.

10. The process for producing composite slow-release organic fertilizer based on comprehensive utilization of livestock and poultry breeding wastewater according to claim 8, characterized in that: The vinasse slurry is added to the pretreated vinasse slurry at a mass ratio of 1:15-18; The mass ratio of EM bacterial powder to pretreated wine lees slurry is 1:50-60; The multi-stage fermentation was performed at 25°C, 28°C and 30°C for 5 days, 10 days and 15 days respectively.

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