CN112225621B - A method for livestock and poultry waste treatment and fertilizer resource utilization - Google Patents

Abstract

The invention provides a method for livestock and poultry pollution waste treatment and fertilizer resource utilization, which belongs to the technical field of resource recovery and utilization. The present invention is composed of a livestock and poultry waste pretreatment unit, an anaerobic digestion treatment unit, an anaerobic digestion liquid classification treatment unit, an organic liquid fertilizer base liquid production unit, a high temperature compost treatment unit and an ecological functional fertilizer production unit. By adopting the method of graded treatment and step-by-step load reduction, the present invention can effectively coordinate the connection between each unit and exert the functions of each unit, and can effectively deal with a large amount of livestock and poultry waste discharged from large-scale livestock and poultry farms every day, and realize The utilization of fertilizer-based resources has created a new model for comprehensive management of livestock and poultry waste in breeding enterprises, utilization of fertilizer-based resources, and ecological development.

Description

A method for livestock and poultry waste treatment and fertilizer resource utilization

technical field

The invention relates to the technical field of resource recovery and utilization, in particular to a method for treating livestock and poultry waste and utilizing fertilizer-based resources.

Background technique

The mainstream process technology of sewage treatment in the world today is biological treatment technology. The traditional process of biological treatment technology is almost used in the treatment of livestock and poultry waste. Among them, the anaerobic (biogas tank) method and the aerobic (aeration tank) method are the mainstream technologies for waste treatment in the livestock and poultry breeding industry in the world today. , including the addition of bacterial species (enzymes), the improved biofilm method, the ecological treatment technology (natural treatment method) and its various combined biotechnology processes, as well as a wide variety of bio-enhanced treatment technologies derived therefrom. At present, domestic and foreign livestock and poultry waste treatment technologies use many biochemical combination technologies, mainly the combination of anaerobic, aerobic and facultative biochemical technologies and the combination of pond, land and wetland ecological treatment technologies. Compared with single biochemical technology, the effect of biological combination technology in the treatment of livestock and poultry waste is improved, but in the end, it cannot achieve the unity of harmless treatment and fertilizer utilization. Due to the difference in technical fields, especially in the field of sewage treatment technology, the technical goal is to deeply purify and discharge wastewater, and a large number of organic resources are digested during the treatment process, and the utilization of fertilizer resources cannot be realized.

SUMMARY OF THE INVENTION

The purpose of the present invention is to provide a method for the treatment of livestock and poultry waste and the utilization of fertilizer resources. Based on the method of grading treatment and step-by-step burden reduction, the present invention can effectively treat a large amount of livestock and poultry waste and achieve harmless treatment and meet standards. Unification of emissions and fertilization resource utilization.

In order to achieve the above-mentioned purpose of the invention, the present invention provides the following technical solutions:

The invention provides a method for livestock and poultry waste treatment and fertilizer utilization, comprising the following steps:

The livestock and poultry sewage waste is subjected to pulping treatment to obtain a pulping liquid, and the pulping liquid is subjected to coarse filtration, filtration and separation to obtain coarse filtration effluent and coarse filtration to separate coarse residue; the filtration used for the coarse filtration and filtration separation The medium specification is 5 to 8 meshes;

Backwashing the coarse filtration and separation of the coarse slag is carried out to obtain the coarse filtration and separation of the coarse slag after the backwashing;

The CSTR process is used to treat the effluent from the crude filtration to obtain an anaerobic digestion solution;

The anaerobic digestion solution is subjected to primary filtration and separation to obtain primary separation filtrate and primary separation coarse residue; the specification of the filter medium used for the primary filtration separation is 12-20 meshes;

The primary separation filtrate is subjected to secondary filtration separation to obtain secondary separation filtrate and secondary separation fine slag; the specification of the filter medium used for the secondary filtration separation is 100-140 mesh;

Using part of the secondary separation filtrate to perform backwashing on the primary separation crude residue, to obtain the secondary separation filtrate after backwashing and the primary separation crude residue after backwashing;

The remaining two-stage separation filtrate is successively treated by the UASB process and the two-stage A/O process to obtain A/O precipitation sludge and A/O effluent; the A/O precipitation sludge is returned for primary filtration and separation; part of The A/O effluent is used for slurrying treatment of the livestock and poultry waste and backwashing the coarse filtration and separation coarse residue, and the remaining A/O effluent is discharged up to the standard;

The coarse filtration separation coarse slag after the backwashing and the primary separation coarse slag after the backwashing are used to prepare solid ecological fertilizer;

The secondary separation fine slag and the backwashed secondary separation filtrate are used to prepare liquid ecological fertilizer.

Preferably, the solid content of the adjusting slurry is 5-20 wt %.

Preferably, the number of times of backwashing the coarse filtration and separation of the coarse slag is 1 to 2 times, and each time the method of backwashing the coarse filtration and separation of the coarse slag independently includes:

Mixing the A/O effluent with the coarse filtration and separation coarse residue to be backwashed to obtain a backwash mixed solution; the solid content of the backwash mixed solution is 10-20wt%;

The backwash mixed solution is subjected to coarse filtration, filtration and separation to obtain coarse slag and backwash effluent after backwashing, and the backwash effluent is combined with the coarse filtration effluent.

Preferably, before using the CSTR process to treat the crude filtration effluent water, the method further comprises: using A/O effluent to adjust the crude filtration effluent to a slurry to a solid content of 5-10 wt%.

Preferably, the solid content of the anaerobic digestion solution is 2-5 wt%.

Preferably, the solid content of the secondary separation filtrate is less than or equal to 2wt%.

Preferably, the number of times of backwashing the primary separation coarse slag is 1 to 2 times, and the method of backwashing the primary separation coarse slag each time independently includes:

Part of the secondary separation filtrate is mixed with the primary separation coarse slag to be backwashed to obtain a backwash mixture; the solid content of the backwash mixture is 5-20wt%;

The backwashing mixed solution is subjected to primary filtration and separation to obtain primary washing filtrate and primary separation coarse residue after backwashing;

The first-stage washing filtrate is subjected to second-stage filtration and separation to obtain the second-stage washing fine slag and the second-stage separation filtrate after backwashing, and the second-stage washing fine slag is combined into the second-stage separation fine slag.

Preferably, the preparation method of the solid ecological fertilizer comprises:

The crude slag after backwashing and the primary separation coarse slag after backwashing and the auxiliary materials are mixed and tempered to carry out open compost fermentation, and the obtained fermentation product is used as raw material to prepare solid ecological fertilizer.

Preferably, the preparation method of described liquid ecological fertilizer comprises:

Mixing and dispersing the secondary separation fine slag and the backwashed secondary separation filtrate to obtain a reversely concentrated slurry;

Carrying out high shear dispersing and emulsification treatment on the reversely concentrated and slurried liquid to obtain a dispersed emulsion;

The dispersed emulsion is subjected to tertiary filtration and separation to obtain tertiary separation filter residue and tertiary separation filtrate; the tertiary separation filter residue is returned for mixing and dispersion, and the tertiary separation filtrate is used as a raw material to prepare liquid ecological fertilizer.

Preferably, the solid content of the reversely concentrated and adjusted slurry is 10-30wt%; the secondary separation fine slag and the secondary separation filtrate after backwashing are mixed and dispersed at a rotational speed of 2800-3000rpm, so The high-shear dispersion and emulsification treatment is carried out under the condition that the rotational speed is 2800-3000 rpm; the specification of the filter medium used in the three-stage filtration and separation is 170-200 meshes.

The invention provides a method for treating livestock and poultry waste and utilizing fertilizer-based resources. By adopting the method of graded treatment and step-by-step load reduction, the present invention can effectively deal with a large amount of livestock and poultry waste and realize the unification of harmless treatment, standard discharge and fertilizer resource utilization, and creates a comprehensive treatment of livestock and poultry pollution in breeding enterprises. A new model of waste and fertilizer resource utilization and ecological development.

Description of drawings

Fig. 1 is a process flow diagram of a method for treating livestock and poultry waste and utilizing a fertilizer-based resource according to the present invention.

Detailed ways

The invention provides a method for livestock and poultry waste treatment and fertilizer utilization, comprising the following steps:

The livestock and poultry sewage waste is subjected to pulping treatment to obtain a pulping liquid, and the pulping liquid is subjected to coarse filtration, filtration and separation to obtain coarse filtration effluent and coarse filtration to separate coarse residue; the filtration used for the coarse filtration and filtration separation The medium specification is 5 to 8 meshes;

Backwashing the coarse filtration and separation of the coarse slag is carried out to obtain the coarse filtration and separation of the coarse slag after the backwashing;

The CSTR (total mixed anaerobic reactor) process is used to treat the crude filtration and separated effluent to obtain anaerobic digestion solution;

The anaerobic digestion solution is subjected to primary filtration and separation to obtain primary separation filtrate and primary separation coarse residue; the specification of the filter medium used for the primary filtration separation is 12-20 meshes;

The primary separation filtrate is subjected to secondary filtration separation to obtain secondary separation filtrate and secondary separation fine slag; the specification of the filter medium used for the secondary filtration separation is 100-140 mesh;

Using part of the secondary separation filtrate to perform backwashing on the primary separation crude residue, to obtain the secondary separation filtrate after backwashing and the primary separation crude residue after backwashing;

The remaining secondary separation filtrate is treated by UASB (up-flow anaerobic sludge bed reactor) process and two-stage A/O (anoxic/aerobic) process in turn to obtain A/O precipitated sludge and A/O effluent; the A/O sedimented sludge is returned for primary filtration and separation; part of the A/O effluent is used for pulping treatment of the livestock and poultry waste and reverse the coarse filtration and separation of the coarse slag Rinse, the remaining A/O effluent is discharged up to the standard;

The coarse filtration separation coarse slag after the backwashing and the primary separation coarse slag after the backwashing are used to prepare solid ecological fertilizer;

The secondary separation fine slag and the backwashed secondary separation filtrate are used to prepare liquid ecological fertilizer.

In the present invention, the livestock and poultry wastes are subjected to pulping treatment to obtain a pulping liquid. The present invention does not specifically limit the sources and types of the livestock and poultry wastes, and those skilled in the art are familiar with the sources and types of livestock and poultry wastes. Livestock and poultry manure, the livestock and poultry manure is specifically collected by the water flushing process, and the livestock and poultry manure is specifically collected by the dry manure removal process. In the present invention, the livestock and poultry wastes are preferably subjected to sizing treatment to obtain a sizing solution, and the solid content of the sizing solution is preferably 5-20 wt %, so as to meet the requirements of pumping or pipeline transportation; in the present invention, The sizing medium used in the sizing treatment is the A/O effluent obtained in the subsequent process, and the amount of the sizing medium is based on making the solid content of the obtained sizing liquid meet the above requirements. In the embodiment of the present invention, the slurry conditioning treatment is specifically carried out in a manure sizing tank.

In the present invention, after the sizing liquid is obtained, the sizing liquid is subjected to coarse filtration and filtration separation (referred to as the first coarse filtration and filtration separation) to obtain coarse filtration and separation water and coarse filtration and coarse slag. In the present invention, the specification of the filter medium used in the first coarse filtration filtration and separation is 5-8 meshes, and specifically may be 5 meshes, 6 meshes, 7 meshes or 8 meshes. The present invention obtains the coarse filtration separation water and coarse filtration separation coarse residue through the 1st coarse filtration and filtration separation, so that these two parts of materials are targeted for subsequent processing. Specifically, the coarse filtration separation water mainly contains easily degradable solubility. Organic matter, the coarse filtration and separation coarse slag mainly contains refractory crude fibrous organic matter. In an embodiment of the present invention, the equipment used for the first coarse filtration, filtration and separation is a filter centrifuge, and the rotor speed of the motor of the filter centrifuge is 1460 rmp, the power is 11kW, and the processing capacity is 20～30m ³ /h; After the 1st coarse filtration filtration and separation, the obtained coarse filtration separated water is transferred into the first buffering sizing tank, and the gained coarse filtration and separated coarse slag is transferred into the first coarse slag concentration sizing tank.

After obtaining the coarse filtration and separation coarse slag, the present invention performs backwashing on the coarse filtration and separation coarse slag to obtain the coarse filtration and separation coarse slag after the backwashing; The medium is the A/O effluent obtained in the subsequent process. In the present invention, the number of times of backwashing the coarse filtration and separation of the coarse slag is preferably 1 to 2 times, and the method of backwashing the coarse filtration and separation of the coarse slag each time preferably independently includes the following steps:

Mixing the A/O effluent with the coarse filtration and separation coarse residue to be backwashed to obtain a backwash mixed solution; the solid content of the backwash mixed solution is 10-20wt%;

The backwash mixed solution is subjected to coarse filtration and filtration separation (referred to as the second coarse filtration and filtration separation) to obtain the coarse filtration and separation slag after backwashing and the backwashing effluent, and the backwashing effluent is combined in The water was separated by coarse filtration.

In the present invention, when backwashing the coarse filtration and separating coarse residue, the amount of the A/O effluent is based on making the solid content of the obtained backwashing mixed solution meet the above requirements; the second coarse filtration The filter medium specification and equipment that filtration and separation adopts are preferably consistent with the filter medium specification and equipment adopted during the first coarse filtration filtration and separation, and will not be repeated here. In the embodiment of the present invention, the A/O effluent is transported to the first coarse slag concentration slurry mixing tank and mixed with the coarse slag separated by coarse filtration to obtain a backwash mixed solution with a solid content of 10-20 wt%, so The backwash mixed solution is subjected to the second rough filtration, filtration and separation through a filtration centrifuge, and the obtained backwash effluent enters the first buffer slurry mixing tank and is merged into the coarse filtration effluent. Return to the first coarse slag concentration sizing tank again, so far to complete 1 reverse flushing of coarse filtration and separation of coarse slag; circulating the above-mentioned reverse washing process can carry out back-washing of coarse filtration and separation of coarse slag again. The invention can further separate the easily degradable organic matter and the refractory organic matter attached to the coarse filtration and separation coarse slag by backwashing the coarse filtration and separation coarse slag. In the present invention, the moisture content of the coarse slag separated by rough filtration after backwashing is preferably ≤80%, which is further used to prepare solid ecological fertilizer, which will be described in detail later.

In the present invention, after the crude filtration separated water is obtained, the CSTR process is used to treat the crude filtration separated water to obtain an anaerobic digestion solution. In the present invention, before using the CSTR process to treat the effluent from the coarse filtration, it preferably further includes: using A/O effluent to adjust the effluent from the coarse filtration to a solid content of 5-10wt%. Specifically, in the actual operation process, after the rough filtration and separation of the coarse slag are carried out backwashing for 1 to 2 times, the backwashed water obtained after the first coarse filtration and separation is combined with the first coarse filtration and separation of the obtained water after the filtration separation, and the obtained mixed solution is slurried. The solid content is 5-10 wt%, and then the CSTR process is used for treatment. The present invention does not specifically limit the equipment and specific operating parameters used in the CSTR process, and equipment and operating parameters well known to those skilled in the art may be used. In the present invention, the solid content of the anaerobic digestion solution is preferably 2-5 wt%. In the embodiment of the present invention, after being processed by the CSTR process, the obtained anaerobic digestion solution is transferred to the anaerobic digestion solution buffer tank. In the present invention, the concentration of easily degradable organic matter in the water separated by the rough filtration is high, and the CSTR process is used for biochemical treatment, which can effectively solve the problem of balance between the energy utilization of biogas and the fertilizer utilization of anaerobic digestion liquid, because it is easy to degrade The higher the concentration of organic matter, the higher the gas production, the higher the concentration of metabolites of anaerobic microorganisms, and the higher the utilization of fertilizer resources.

After the anaerobic digestion solution is obtained by the present invention, the anaerobic digestion solution is subjected to primary filtration and separation (referred to as the first-stage filtration and separation) to obtain primary separation filtrate and primary separation coarse residue. In the present invention, the specification of the filter medium used in the first-stage filtration and separation is 12 to 20 meshes, specifically 12 meshes, 14 meshes, 16 meshes, 18 meshes or 20 meshes. The present invention obtains the first-level separation filtrate and the first-level separation crude residue through the first-level filtration and separation. Specifically, the first-level separation filtrate is mainly composed of anaerobic microbial cells and their own metabolites, including the crude cells of the bacteria. Protein, amino acid, macromolecular humic acid (HA) and physiologically active substances with multiple functions such as promoting crop growth, disease resistance and insect control; the first-level separation coarse residue is mainly composed of undigested and decomposed plant fibers with larger particle size. In an embodiment of the present invention, the equipment used for the first-stage filtration and separation is a filter centrifuge (referred to as a first-stage filter centrifuge), and the motor rotor speed of the first-stage filter centrifuge is 1460 rmp, and the power is 11kW , the treatment capacity is 20～30m ³ /h; after the first-stage filtration and separation, the obtained first-stage separation coarse slag is transferred to the first-stage separation coarse slag storage tank, and the obtained first-stage separation filtrate is transferred to the first-stage separation filtrate intermediate storage tank in the pool.

After the primary separation filtrate is obtained in the present invention, the primary separation filtrate is subjected to secondary filtration separation (referred to as the first secondary filtration separation) to obtain secondary separation filtrate and secondary separation fine residue. In the present invention, the specification of the filter medium used in the first-stage filtration and separation is 100-140 mesh, specifically 100 mesh, 120 mesh or 140 mesh. The present invention obtains secondary separation filtrate and secondary separation fine slag through the second stage filtration and separation, specifically, the secondary separation filtrate is mainly composed of soluble protein, amino acid, fulvic acid (FA) and promoting crop growth, It is composed of physiologically active substances with multiple functions such as disease resistance and insect control; the secondary separation crude residue is mainly composed of insoluble or insoluble crude protein, macromolecular humic acid (HA) and other organic substances. In the embodiment of the present invention, the equipment used for the second stage filtration and separation is a filter centrifuge (referred to as a second stage filter centrifuge), and the motor rotor speed of the second stage filter centrifuge is 1460rmp, and the power is 11kW , the processing capacity is 20-30m ³ /h; after the second stage filtration and separation, the obtained second stage separation fine slag is transferred to the second stage separation fine slag storage tank, and the obtained second stage separation filtrate is transferred to the second stage separation filtrate intermediate storage tank in the pool.

After the secondary separation filtrate is obtained, part of the secondary separation filtrate is used to backwash the primary separation crude residue, and the remaining secondary separation filtrate is processed by the UASB process and the two-stage A/O process in sequence. In the present invention, the solid content of the secondary separation filtrate is preferably ≤2wt%. In the embodiment of the present invention, after the secondary separation filtrate is transferred to the secondary separation filtrate intermediate storage tank, specifically, the secondary separation filtrate overflow exceeding the storage capacity of the secondary separation filtrate intermediate storage tank is transferred to the second buffer for sizing In the tank, the UASB process and the two-stage A/O process are used to treat the secondary separation filtrate in the second buffer pulping tank to obtain A/O sediment sludge and A/O effluent. The present invention does not specifically limit the equipment and specific operating parameters used in the UASB process and the two-stage A/O process, and the equipment and operating parameters well known to those skilled in the art may be used. In the present invention, the concentration of the anaerobic digestion solution obtained after being treated by the UASB process is preferably 2000-4000 mg/L; the anaerobic digestion solution is directly subjected to deep biochemical treatment by the two-stage A/O process, and the obtained A/O effluent index It is: BOD ₅ ≤150mg/L, COD ≤400mg/L, meeting the requirements of "Water Pollutant Discharge Standard for Livestock and Poultry Breeding Industry"GB18596-2001; part of the A/O effluent is used to adjust the livestock and poultry waste. Slurry treatment and backwashing of the coarse filtration and separation coarse slag, and the remaining A/O effluent is discharged up to the standard.

In the present invention, the A/O precipitation sludge obtained after the two-stage A/O process is returned for first-stage filtration and separation; in the embodiment of the present invention, during the actual operation, the A/O precipitation sludge is further After settling, the supernatant and bottom sludge are obtained, the supernatant is transported to the second buffer slurry mixing tank for related treatment, and the bottom sludge is transferred to the anaerobic digestion liquid buffer tank to be mixed with the anaerobic digestion solution. The oxygen-digested liquid is mixed and then subjected to the next cycle of primary filtration and separation treatment. In the present invention, the total solid (TS) concentration of the secondary separation filtrate is already very low, and the UASB process is used for biochemical treatment to further remove the organic matter in the secondary separation filtrate; then the two-stage A/O process is directly used Carry out in-depth biochemical treatment, in which the primary A/O treatment can further remove COD and BOD in the anaerobic digestion solution discharged from the UASB process, and convert ammonia nitrogen into nitrogen to achieve denitrification; secondary A/O treatment and primary A/O treatment As with /O treatment, ammonia nitrogen is further converted into nitrogen for further denitrification to achieve the purpose of deep biochemical treatment.

In the present invention, part of the secondary separation filtrate is used to perform backwashing on the primary separation coarse residue, so as to obtain the secondary separation filtrate after backwashing and the primary separation coarse residue after backwashing; in the embodiments of the present invention Specifically, the secondary separation filtrate in the secondary separation filtrate intermediate storage tank is used for backwashing the primary separation coarse slag. In the present invention, the number of times of backwashing the primary separation coarse slag is preferably 1 to 2 times, and each time the method of backwashing the primary separation coarse slag independently preferably includes:

Part of the secondary separation filtrate is mixed with the primary separation coarse slag to be backwashed to obtain a backwash mixture; the solid content of the backwash mixture is 5-20wt%;

The backwashing mixed solution is carried out to one-stage filtration and separation (referred to as the first II-stage filtration and separation) to obtain the first-stage washing filtrate and the first-stage separation slag after the backwashing;

The first-level washing filtrate is subjected to secondary filtration and separation (referred to as the second-level filtration and separation) to obtain the second-level washing fine slag and the secondary separation filtrate after the backwashing, and the second-level washing fine slag is merged in. in the secondary separation fine slag.

In the present invention, the specifications of the filter medium and equipment used in the second stage of filtration and separation are preferably consistent with the specifications and equipment of the filter medium used in the first stage of filtration and separation; The filter medium specifications and equipment are preferably consistent with the filter medium specifications and equipment used for the second-stage filtration and separation, and will not be repeated here. In the embodiment of the present invention, the secondary separation filtrate in the secondary separation filtrate intermediate storage tank and the primary separation coarse slag in the primary separation coarse slag storage tank are transported to the second disposal concentration slurry mixing tank for mixing , to obtain a backwashing mixed solution with a solid content of 5 to 20 wt%; the backwashing mixed solution is subjected to the second-stage filtration and separation by a first-stage filtration centrifuge, and the obtained first-stage separation coarse slag after backwashing is transferred to In the primary separation coarse slag storage tank, the obtained primary washing filtrate is subjected to the secondary filtration and separation of the secondary filtration centrifuge to obtain the secondary washing fine slag and the secondary separation filtrate after reverse washing. The washing fine slag is transferred into the secondary separation fine slag storage tank and combined with the secondary separation fine slag, and the secondary separation filtrate after the reverse flushing is transferred into the secondary separation filtrate intermediate storage tank, so far the primary separation coarse slag is completed. One-time backwashing of the slag; the above-mentioned backwashing process can be used for backwashing the first-level separation coarse slag again. The invention can recycle the nutrient components and physiologically active substances adhering to the surface of the undigested and decomposed organic matter with larger particle size by backwashing the first-level separation coarse slag.

After obtaining the coarse filtration and separation coarse slag after backwashing and the primary separation coarse slag after backwashing, the present invention separates the coarse filtration and separation coarse slag after backwashing and the primary separation coarse slag after backwashing. For the preparation of solid ecological fertilizers. In the present invention, the preparation method of described solid ecological fertilizer preferably comprises:

The crude slag after backwashing and the primary separation coarse slag after backwashing and the auxiliary materials are mixed and tempered to carry out open compost fermentation, and the obtained fermentation product is used as raw material to prepare solid ecological fertilizer.

In the present invention, the coarse slag separated by rough filtration after backwashing and the first-stage separated coarse slag after backwashing are used as main materials, mixed with auxiliary materials for conditioning and then subjected to open compost fermentation. The present invention has no special limitation on the types and sources of the auxiliary materials, and the types and sources of auxiliary materials that are well known to those skilled in the art can be used, and specifically can be crop straw, forest fruit pruning, rice bran (pulverized rice husk) and edible fungus residue one or more of them. In the present invention, the moisture content of the main material is preferably ≤80%, and the moisture content of the auxiliary material is preferably ≤10%.

In the present invention, the mixing and tempering is preferably adjusted to the moisture content of the pile obtained after mixing the main material and the auxiliary material to 55-60%, and the C/N to be adjusted to (25-30):1.

In the present invention, the operation cycle of the open compost fermentation is preferably 40-50 days. Specifically, the open compost fermentation includes the first fermentation and the second fermentation performed in sequence, and the cycle of the first fermentation is preferably From 15 to 20 days, the first fermentation is preferably carried out under aeration conditions, and the aeration rate is preferably 50 to 300 L/min, more preferably 100 L/min; the period of the second fermentation is preferably 25 to 30 days, and the first fermentation The secondary fermentation is preferably carried out under non-aerated conditions.

In the embodiment of the present invention, the open compost fermentation is preferably carried out in an L-shaped open compost fermentation tank; the L-shaped open compost fermentation tank includes a single-sided wall and an open floor, that is, a single-sided wall and an open floor. The open ground together constitutes an L-type open compost fermentation space; wherein, a gas explosion device is provided at the bottom of the corresponding area (referred to as the first fermentation area) during the first fermentation in the L-type open compost fermentation tank. The air device is composed of a fan, an air distribution duct and a trough bottom air bed.

In the embodiment of the present invention, specifically, the main material and auxiliary material are directly fed into the first fermentation area of the L-type open compost fermentation tank for mixing and tempering, and the turning and throwing machine is started to stir evenly, and the first fermentation is started. Process; the turning machine is an open turning machine and/or a large-span rack-type turning machine; in the first fermentation process, the turning machine is started to turn the heap to control the temperature of the heap, and the explosion is started in a timely manner. The gas device aerates and supplies oxygen for the stack, and completes the first fermentation process within a predetermined working cycle.

In the embodiment of the present invention, after the first fermentation is completed, the obtained pile is transferred by a forklift to an L-type open compost fermentation tank for the second fermentation to be carried out in the corresponding area (referred to as the second fermentation area) for the second fermentation process; The second fermentation process starts the turning machine to turn the heap at a proper time, so as to promote the further decomposition and aging of organic substances such as hemicellulose, cellulose and lignin in the heap and further evaporation of the water in the heap, and at a predetermined time. The second fermentation process is completed within the working cycle.

In the present invention, a fermentation product is obtained after the second fermentation is completed; the present invention does not specifically limit the method for preparing the solid ecological fertilizer by using the fermentation product, and a method well known to those skilled in the art can be used.

After the secondary separation fine slag and the backwashed secondary separation filtrate are obtained, the present invention uses the secondary separation fine residue and the backwashed secondary separation filtrate to prepare liquid ecological fertilizer. In the present invention, the preparation method of described liquid ecological fertilizer preferably comprises:

Mixing and dispersing the secondary separation fine slag and the backwashed secondary separation filtrate to obtain a reversely concentrated slurry;

Carrying out high shear dispersing and emulsification treatment on the reversely concentrated and slurried liquid to obtain a dispersed emulsion;

The dispersed emulsion is subjected to tertiary filtration and separation to obtain tertiary separation filter residue and tertiary separation filtrate; the tertiary separation filter residue is returned for mixing and dispersion, and the tertiary separation filtrate is used as a raw material to prepare liquid ecological fertilizer.

In the present invention, the secondary separation fine slag and the secondary separation filtrate after backwashing are mixed and dispersed to obtain a reversely concentrated slurry. In the present invention, the solid content of the reversely concentrated slurry is preferably 10-30 wt%. In the present invention, the ratio of the secondary separation fine slag and the backwashed secondary separation filtrate is based on making the solid content of the obtained reversely concentrated and adjusted slurry meet the above requirements. In the present invention, the mixing and dispersing is preferably performed under the condition of a rotational speed of 2800-3000 rpm, and the mixing and dispersing time is preferably 15-30 min. In the embodiment of the present invention, the mixing and dispersing is carried out in a mixing reaction kettle, and the mixing reaction kettle is equipped with a dispersing mixer, and the dispersing mixer is preferably a batch-type jet-flow dispersing mixer.

In the present invention, after the reversely concentrated sizing liquid is obtained, the reversely concentrated slurried liquid is subjected to high shear dispersion and emulsification treatment to obtain a dispersed emulsified liquid. In the present invention, the high-shear dispersion and emulsification treatment is preferably performed under the condition of a rotational speed of 2800-3000 rpm, and the time of the high-shear dispersion and emulsification treatment is preferably 60-120 min. In the embodiment of the present invention, the high shear dispersing emulsification treatment is performed in a pipeline high shear dispersing emulsifier.

The present invention can activate the physiologically active substances in the reverse concentrated slurry through high shear dispersion and emulsification treatment. In the embodiment of the present invention, specifically, the secondary separation fine slag and the secondary separation filtrate after backwashing are mixed in the third buffer slurry mixing tank, and the obtained reverse concentrated slurry mixing is pumped into a machine with a dispersing mixer In the mixing reaction kettle, start the dispersing mixer, contact, mix and disperse in the closed mixing reaction kettle for 15 to 30 minutes, then start the pressurized pump, and open the pipeline high shear dispersing emulsifier at the same time. Continue to carry out cyclic shearing, dispersing and emulsification treatment to the concentrated slurry for 60 to 120 minutes, and then discharge to obtain a dispersed emulsion.

After the dispersing emulsion is obtained in the present invention, the dispersing emulsion is subjected to tertiary filtration and separation to obtain a tertiary separation filter residue and a tertiary separation filtrate; the tertiary separation filter residue is returned for mixing and dispersion, and the tertiary separation filtrate is obtained Preparation of liquid ecological fertilizer for raw materials. In the present invention, the specification of the filter medium used in the three-stage filtration and separation is preferably 170-200 mesh, specifically 170 or 200 mesh. In the embodiment of the present invention, the equipment used for the tertiary filtration and separation is a filtration centrifuge (referred to as a tertiary filtration centrifuge). In the embodiment of the present invention, in the actual operation process, the three-stage separation filter residue is transferred to the third buffer pulping tank, and the second-stage separation fine residue in the third buffer pulping tank and backwashing are carried out. The post-secondary separation filtrate is mixed. In the present invention, the tertiary separation filter residue is returned for mixing and dispersion, so that the tertiary separation filter residue can participate in the process of activation treatment of physiologically active substances, and the biologically active substances therein can be fully utilized. The present invention does not specifically limit the method for preparing the liquid ecological fertilizer by using the tertiary separation filtrate, and a method well known to those skilled in the art can be used.

In the present invention, the process of using the above method to realize the treatment of livestock and poultry waste and the utilization of fertilizer resources is divided into 6 units according to functional characteristics, including the livestock and poultry waste pretreatment unit, the anaerobic digestion treatment unit, and the anaerobic digestion liquid. Grading processing unit, organic liquid fertilizer base liquid production unit, high temperature composting processing unit and ecological functional fertilizer production unit;

The livestock and poultry waste pretreatment unit includes a manure collecting tank, a filter centrifuge for coarse filtration, a first buffer size mixing tank and a first coarse residue concentration mixing tank; The material port is communicated with the feed port of the filtration centrifuge for coarse filtration, the liquid outlet of the filtration centrifuge for coarse filtration is communicated with the feed port of the first buffer slurry mixing tank, and the discharge port of the filtration centrifuge for coarse filtration is communicated. The slag port is communicated with the feed port of the first coarse slag concentration sizing tank through the conveying equipment, and the discharge port of the first coarse slag concentration sizing tank is communicated with the feed port of the filter centrifuge for coarse filtration; the conveying The equipment preferably comprises a screw conveyor, a pipe chain conveyor or a belt conveyor;

The anaerobic digestion treatment unit includes a CSTR system, a UASB system, a two-stage A/O system, an anaerobic digestion liquid buffer tank, a second buffer pulping tank and a sludge sedimentation tank; the anaerobic digestion liquid classification treatment unit includes The primary filter centrifuge, the secondary filter centrifuge, the primary separation coarse residue storage tank, the secondary separation fine residue storage tank, the primary separation filtrate intermediate storage tank, the secondary separation filtrate intermediate storage tank and the second coarse residue concentration adjustment slurry tank; wherein, the feed port of the CSTR system is communicated with the discharge port of the first buffer slurry mixing tank, the discharge port of the CSTR system is communicated with the feed port of the anaerobic digestion liquid buffer pool, and the anaerobic digestion liquid buffer pool is connected. The discharge port of the oxygen digestate buffer pool is communicated with the feed port of the primary filtration centrifuge, and the slag discharge port of the primary filtration centrifuge is communicated with the feed port of the primary separation coarse slag storage tank through the conveying equipment. The liquid outlet of the first-stage filtration centrifuge is communicated with the feed port of the first-stage separation filtrate intermediate storage tank, and the discharge port of the first-stage separation filtrate intermediate storage tank is communicated with the feed port of the second-stage filtration centrifuge. The slag discharge port of the secondary filtration centrifuge is connected with the feed port of the secondary separation fine slag storage tank through the conveying equipment, and the liquid outlet of the secondary filtration centrifuge is connected to the feed of the second coarse slag concentration sizing tank. The outlet is connected, and the outlet of the primary separation coarse slag storage tank is communicated with the feed inlet of the secondary separation filtrate intermediate storage tank, and the first outlet of the secondary separation filtrate intermediate storage tank is connected to the second coarse residue. The feed port of the slag concentration sizing tank is communicated, and the discharge port of the second coarse slag concentration sizing tank is communicated with the feed port of the primary filtration centrifuge; the second outlet of the secondary separation filtrate intermediate storage tank The material port is communicated with the feed port of the second buffer mixing tank, and there is a high level difference between the second discharge port of the secondary separation filtrate intermediate storage tank and the feed port of the second buffer size mixing tank, which is convenient for materials from a high level. overflow to a low level; the discharge port of the second buffer mixing tank is communicated with the feed port of the UASB system, the discharge port of the UASB system is communicated with the feed port of the two-stage A/O system, the two The sludge discharge port of the sedimentation tank in the first-level A/O system is communicated with the feed port of the anaerobic digestion liquid buffer tank, and the supernatant liquid overflow port of the sedimentation tank in the two-level A/O system is connected with the second buffer adjustment. The feeding port of the pulp tank is communicated, and the water outlet of the two-stage A/O system is respectively communicated with the first buffer pulping tank, the manure collecting pulping tank and the first coarse slag concentration pulping tank;

The organic liquid fertilizer base liquid production unit includes a third buffer slurry mixing tank, a mixing reaction kettle, a pressurized pump, a pipeline type high shear dispersing emulsifier and a three-stage filtration centrifuge; wherein, the third buffer slurry mixing tank The feed port is respectively connected with the discharge port of the secondary separation fine slag storage tank and the third discharge port of the secondary separation filtrate intermediate storage tank, and the discharge port of the third buffer slurry mixing tank is connected with the inlet of the mixing reactor. The material port is connected, the mixing reaction kettle, the pipeline type high shear dispersing emulsifier and the pressurizing pump are connected in sequence and form a material circulation path, the discharge port of the mixing reaction kettle and the feed port of the tertiary filter centrifuge The slag discharge port of the three-stage filter centrifuge is connected with the feed port of the third buffer slurry mixing tank through the conveying equipment; the organic liquid fertilizer base liquid production unit is filtered and separated by the three-stage filter centrifuge. The filtrate is the raw material of functional organic liquid fertilizer;

The high-temperature composting treatment unit includes an open fermentation tank, a degassing device and a turning machine; wherein, the open fermentation tank is divided into a first fermentation area and a second fermentation area, and the degassing device is arranged in the first fermentation area. The bottom of a fermentation area; the high-temperature composting treatment unit is used to receive the coarse filtration and separation coarse slag after backwashing in the livestock and poultry sewage waste pretreatment unit and the primary separation after backwashing in the anaerobic digestion liquid grading treatment unit Coarse slag, the two are combined with auxiliary materials for open compost fermentation to obtain functional solid fertilizer raw materials;

The ecological functional fertilizer production unit is used to receive the functional solid fertilizer raw materials produced by the high temperature compost processing unit and the functional organic liquid fertilizer raw materials produced by the organic liquid fertilizer base liquid production unit, and convert them into solid ecological fertilizer and liquid ecological fertilizer respectively.

FIG. 1 is a process flow diagram of a method for treating livestock and poultry waste and utilizing a fertilizer-based resource according to the present invention. The method of the present invention will be described below with reference to FIG. 1 . The processing unit that adopts the method provided by the present invention to realize the treatment of livestock and poultry waste and the utilization of fertilizer resources includes a livestock and poultry waste pretreatment unit, an anaerobic digestion processing unit, an anaerobic digestion liquid classification processing unit, an organic liquid fertilizer base liquid production unit, High temperature compost processing unit and ecological functional fertilizer production unit. Among them, the purpose of the livestock and poultry waste pretreatment unit is to effectively separate easily degradable organic matter and refractory organic matter. The anaerobic digestion treatment unit is specifically: the biochemical treatment of the CSTR system obtains a higher concentration of anaerobic digestion liquid, which is to create conditions for the production of organic liquid fertilizer; the biochemical treatment of the UASB system to obtain a lower concentration of anaerobic digestion liquid, for the purpose of The conditions for further advanced treatment of anaerobic digestate are created; the advanced biochemical treatment through the two-stage A/O system is to create conditions for the reuse of anaerobic digestate (such as reverse slurry mixing and backwashing) and standard discharge. The anaerobic digestion liquid classification processing unit plays a role in balancing the anaerobic digestion processing load and the organic liquid fertilizer base liquid production load, and also plays a role as a bridge between anaerobic digestion processing and organic liquid fertilizer base liquid production and high-temperature composting. The role of the link; specifically, by grading the anaerobic digestion liquid produced by the CSTR system in the anaerobic digestion treatment unit, the microbial cells and microbial metabolites in the CSTR system are retained in the liquid to the maximum extent, effectively improving The concentration of functional substances in the secondary separation filtrate is used to realize the utilization of fertilizer resources. The organic liquid fertilizer base liquid production unit is based on the secondary separation of fine slag and the higher concentration of secondary separation filtrate in the anaerobic digestion liquid classification treatment unit. It is processed in an integrated process, and the ultra-concentrated biogas slurry with high physiological activity (ie, the tertiary separation filtrate) is obtained after tertiary filtration and separation, which is the functional organic liquid fertilizer raw material. The high-temperature composting treatment unit is used to receive the coarse filtration and separation coarse slag after backwashing in the pretreatment of livestock and poultry waste and the primary separation coarse slag after backwashing in the anaerobic digestion liquid classification treatment, and mix the two with auxiliary materials. Open compost fermentation to obtain functional solid fertilizer raw materials. The ecological functional fertilizer production unit is the end point of the technical solution of the present invention, that is, the whole process of manure treatment and fertilizer resource utilization in large-scale livestock and poultry farms is completed; The liquid fertilizer raw materials and the functional solid fertilizer raw materials produced by the high-temperature composting treatment unit are converted into ecological functional fertilizers. It has the advantages of new fertilizers such as organic fertilizer, inorganic chemical fertilizer, biological bacterial fertilizer and slow-release and synergistic organic compound fertilizer. Eco-functional fertilizer products.

The technical solutions in the present invention will be clearly and completely described below with reference to the embodiments. Obviously, the described embodiments are only some, but not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

Example 1

In this embodiment, the livestock and poultry waste to be treated is the manure discharged from the large-scale dairy farm, and the manure removal method is the reciprocating manure scraping board, that is, the dry manure removal process. A method for treating and fertilizing the waste from the dairy farm, comprising the following steps;

The manure of the cow house is collected in the collection tank at one end of the cow house through the scraping board, and then collected into the manure collection tank through the pipeline, and the A/O effluent (from the two-stage A/O process) is used for processing. Sizing treatment to obtain a sizing liquid, the solid content of the sizing liquid is 10wt%;

A filter centrifuge (referred to as a filter centrifuge for coarse filtration, the filter medium specification is 8 meshes, the motor rotor speed is 1460rmp, the power is 11kW, and the processing capacity is 20-30m ³ /h) is used to roughen the slurry. Filtration and filtration separation (denoted as the 1st coarse filtration and filtration separation), obtain coarse filtration separation water and coarse filtration separation coarse slag, described coarse filtration separation effluent is transferred into the first buffer sizing tank, and described coarse filtration separation coarse slag turns into the first coarse slag concentration mixing tank;

Use A/O effluent to backwash the coarse filtration and separation coarse slag twice to obtain the coarse filtration and separation coarse slag after backwashing, with a moisture content of ≤80% (further used in the preparation of solid ecological fertilizers, which will be described in detail later. ); wherein, the method for backwashing the coarse filtration and separation of the coarse slag each time comprises: transporting the A/O effluent to the first coarse slag concentration sizing tank to mix with the coarse filtration and separation of the coarse slag to obtain a solid content of 10～20wt% of the backwash mixed solution, the backwash mixed solution is subjected to coarse filtration and filtration separation (referred to as the second coarse filtration and filtration separation) through coarse filtration with a filter centrifuge, and the obtained backwash effluent enters the first. The buffer sizing tank is merged into the effluent water separated by the rough filtration, and the obtained rough filtration and separation coarse slag after reverse washing is returned to the first coarse slag concentration sizing tank again, so far to complete one reverse washing of the coarse filtration and separation of the coarse slag; circulation; The above-mentioned backwashing process can carry out backwashing to the coarse filtration and separation coarse residue again;

A/O effluent is used to adjust the mixed liquor in the first buffer mixing tank to a solid content of 5-8wt%, and then transported to the CSTR system for processing to obtain an anaerobic digestion solution with a solid content of 2-5wt%. transferring the anaerobic digestion solution into the anaerobic digestion solution buffer tank;

A filter centrifuge (referred to as a first-stage filter centrifuge, the filter medium specification is 16 mesh, the motor rotor speed is 1460rmp, the power is 11kW, and the processing capacity is 20-30m ³ /h) is used to carry out the first-stage treatment on the anaerobic digestion solution. Filtration and separation (denoted as the first-level filtration and separation) obtains a first-level separation filtrate and a first-level separation coarse slag. into the primary separation filtrate intermediate storage tank;

A filtration centrifuge (referred to as a secondary filtration centrifuge, the filter medium specification is 120 mesh, the motor rotor speed is 1460 rmp, the power is 11 kW, and the processing capacity is 20-30 m ³ /h) is used for the secondary separation of the filtrate. Filtration and separation (denoted as the second stage of filtration and separation), obtains the secondary separation filtrate and the secondary separation fine slag, and the secondary separation fine slag is transferred into the secondary separation fine slag storage tank, and the secondary separation filtrate ( solid content≤2wt%) into the secondary separation filtrate intermediate storage tank;

Part of the secondary separation filtrate is used to backwash the primary separation coarse slag twice to obtain the secondary separation filtrate after backwashing and the primary separation coarse residue after backwashing; The method for backwashing the primary separation coarse slag includes: mixing the secondary separation filtrate in the secondary separation filtrate intermediate storage tank and the primary separation coarse residue in the primary separation coarse slag storage tank to obtain a solid content of 10wt% The backwash mixed solution; the backwash mixed solution is subjected to the second-stage filtration and separation through the first-stage filtration centrifuge, and the first-stage separation coarse slag after the gained backwash is transferred into the first-stage separation coarse slag storage tank, The obtained first-stage washing filtrate is subjected to the second-stage filtration and separation through the second-stage filtration centrifuge to obtain the second-stage washing fine slag and the second-stage separation filtrate after backwashing, and the second-stage washing fine slag is transferred to the second-stage separation fine slag. The slag storage tank is combined with the secondary separation fine slag, and the secondary separation filtrate after the backwash is transferred into the secondary separation filtrate intermediate storage tank, so far to complete one backwash of the primary separation coarse slag; circulation; The above-mentioned backwashing process can perform backwashing on the first-level separation coarse slag again;

The overflow of the secondary separation filtrate that exceeds the storage capacity of the secondary separation filtrate intermediate storage tank is transferred to the second buffer mixing tank, and the secondary separation filtrate in the second buffer mixing tank is treated by the UASB process, and processed by the UASB process The concentration of the obtained anaerobic digestion solution is 2000-4000 mg/L; then the anaerobic digestion solution is directly subjected to deep biochemical treatment by a two-stage A/O process to obtain A/O precipitation sludge and A/O effluent. The A/O effluent indicators are: BOD ₅ ≤150mg/L, COD≤400mg/L, which meet the requirements of "Water Pollutant Discharge Standard for Livestock and Poultry Breeding Industry"GB18596-2001; some of the A/O effluent is returned to the The livestock and poultry wastes are subjected to pulping treatment, the coarse filtration and separation of coarse residues are subjected to reverse washing, and the mixed liquid in the first buffer pulping tank is subjected to pulping treatment, and the remaining A/O effluent is discharged up to the standard; After further sedimentation of the /O sedimented sludge, supernatant and bottom sludge are obtained, the supernatant is transported to the second buffer slurry tank, and the bottom sludge is transferred to the anaerobic digestion liquid buffer tank After being mixed with the anaerobic digestion solution, the next cycle of primary filtration and separation treatment is performed;

After obtaining the coarse filtration and separation coarse slag after backwashing and the primary separation coarse slag after backwashing, the backwashing coarse filtration and separation coarse slag and the primary separation coarse slag after backwashing are used as the main method. After mixing and tempering with auxiliary materials, open compost fermentation is carried out, and the obtained fermentation product is used as raw material to prepare solid ecological fertilizer; wherein, the moisture content of the main material is 80%, the moisture content of the auxiliary material is 10%, The auxiliary material is a mixture of crop straw, forest fruit pruning, rice bran (crushed rice husk) and edible fungus residue; the moisture content of the pile obtained after mixing the main material and auxiliary material is 60%, and the C/N ratio is (25-30): 1; the open compost fermentation is carried out in an L-type open compost fermentation tank, the L-type open compost fermentation tank includes a single-sided wall and an open floor, and the L-type open compost fermentation tank conducts the first During fermentation, the bottom of the corresponding area (denoted as the first fermentation area) is provided with a gas explosion device, and the gas explosion device is composed of a ventilator, an air distribution pipe and a tank bottom aeration bed; when performing open compost fermentation, specifically The main materials and auxiliary materials are directly fed into the first fermentation area of the L-type open compost fermentation tank for mixing and tempering, and the turning and throwing machine is started to stir evenly, and the first fermentation process is started; the turning and throwing machine is an open-type turning and throwing machine and/or large-span rack-type turning machine; during the first fermentation process, the turning machine is started to turn the heap to control the temperature of the heap, and the detonation device is started to aerate and supply oxygen to the heap at a predetermined time. The first fermentation process is completed within the operation cycle of the first fermentation; after the first fermentation is completed, the obtained pile is transferred by a forklift to the L-type open compost fermentation tank for the second fermentation in the corresponding area (referred to as the second fermentation area) for the second fermentation. Process; the second fermentation process starts the turning machine to turn the heap in time to promote the further decomposition and aging of organic substances such as hemicellulose, cellulose and lignin in the heap and further evaporation of the water in the heap, and in the The second fermentation process is completed within a predetermined operation cycle; the cycle of the first fermentation is 15d, the first fermentation is carried out under aeration conditions, and the ventilation rate is 100L/min; the cycle of the second fermentation is 25d, the second fermentation is performed under non-aerated conditions;

After obtaining the secondary separation fine slag and the secondary separation filtrate after backwashing, the secondary separation fine residue and the secondary separation filtrate after backwashing are used to prepare liquid ecological fertilizer, and the preparation method includes: The separated fine slag and the secondary separation filtrate after backwashing are mixed in the third buffer slurry mixing tank, and the obtained reversely concentrated slurry is pumped into a mixing reactor with a dispersing mixer, and the dispersing mixer is started. Under the condition of 2900rpm, contact, mix and disperse for 30min in the closed mixing reactor, then start the pressurizing pump, open the pipeline type high shear dispersing emulsifier simultaneously, and reversely concentrate and adjust the slurry in the mixing reactor (solid content is 10wt%) continue to carry out cyclic shearing dispersion emulsification treatment for 60min (rotating speed is 2900rpm), and then discharging to obtain dispersed emulsion; Adopt filter centrifuge (denoted as three-stage filter centrifuge, filter medium specification is 200 meshes, and motor rotor speed is 1460rmp, power is 11kW, processing capacity is 20～30m ³ /h) carry out tertiary filtration and separation on the disperse emulsion to obtain tertiary separation filter residue and tertiary separation filtrate, and transfer the tertiary separation filter residue to the third In the buffer slurry mixing tank, the secondary separation fine slag in the third buffer slurry mixing tank and the secondary separation filtrate after backwashing are mixed and dispersed, and the tertiary separation filtrate is used as a raw material to prepare liquid ecological fertilizer.

As can be seen from the above embodiments, the method provided by the present invention has at least the following advantages:

1. The method provided by the present invention is composed of a livestock and poultry waste pretreatment unit, an anaerobic digestion treatment unit, an anaerobic digestion liquid classification treatment unit, an organic liquid fertilizer base liquid production unit, a high-temperature compost treatment unit and an ecological functional fertilizer production unit. Integrate and integrate modern sewage biochemical treatment technology, centrifugal filtration separation technology, functional fertilizer production technology and supporting process equipment, and focus on solving a series of ecological environment and resource utilization problems caused by large-scale livestock and poultry waste in large-scale farms. .

2. The method provided by the present invention is to reduce the burden step by step and balance the processing capacity that each processing unit can bear to the greatest extent. For example, the setting of the anaerobic digestion liquid classification processing unit can balance the anaerobic digestion processing unit and the organic liquid fertilizer base liquid production unit. And the load between the three high-temperature composting processing units, plays the role of a bridge and link between the anaerobic digestion processing unit, the organic liquid fertilizer base liquid production unit and the high-temperature composting processing unit.

3. The method provided by the present invention integrates various functions, and can timely and efficiently remove the large amount of livestock and poultry waste discharged from large-scale farms every day and the CSTR system (biogas project) in its anaerobic digestion treatment unit. Anaerobic digestion liquid (biogas residue, biogas slurry mixture) is treated and the corresponding fertilizer resources are utilized to achieve the purpose of purifying the environment, reducing pollution and improving economic benefits.

4. The method provided by the present invention is based on the functional characteristics of the anaerobic digestion liquid of the anaerobic digestion treatment unit CSTR system (biogas engineering), and a process technology route of grading treatment, reverse flushing (or dilution) and reverse concentration is selected, It has concentratedly solved the problems in the large amount of livestock and poultry manure (sewage) discharged by large-scale farms and the anaerobic digestion liquid (biogas residue, biogas mixture) discharged by its anaerobic digestion treatment unit CSTR system (biogas project) every day. The problem of fine separation of degradable organic matter and easily degradable organic matter has concentratedly solved the problem of concentration of anaerobic digestion liquid (biogas slurry).

5. The preparation process of high physiological activity concentrated biogas slurry (tertiary separation filtrate) in the method provided by the present invention selects a process route that uses physical methods to activate active substances, which effectively improves various amino acids, humic acids (especially yellow The content of organic acids such as humic acid) and the safety of the ecological environment provide a basis for the synergistic treatment process of anaerobic digestate, which can be applied to large-scale production, with low cost and simple operation.

6. In the method provided by the present invention, the process of circulating and reciprocating, high-frequency dispersing and emulsification is carried out by using a batch-type jet-flow dispersing mixer and a pipeline-type high-shear dispersing emulsifier to activate the reversely concentrated slurry (secondary separation of fine slag and reversed emulsification). Physiologically active substances in the secondary separation filtrate after washing), so that it has higher physiological activity and higher stability, which is rich in small molecular weight amino acids, fulvic acid and other organic acids, which can not only maintain Its functional liquid fertilizer raw material pH, NPK nutrients and the stability of micronutrients required for the growth of neoplastic plants, and as a growth regulator, it can promote the development of plant roots, stimulate plant growth, and promote photosynthesis.

The above are only the preferred embodiments of the present invention. It should be pointed out that for those skilled in the art, without departing from the principles of the present invention, several improvements and modifications can be made. It should be regarded as the protection scope of the present invention.

Claims (4)

1. A method for livestock and poultry waste treatment and fertilizer resource utilization, comprising the following steps: Establish a livestock and poultry waste treatment and fertilizer resource utilization system. The livestock and poultry waste treatment and fertilizer resource utilization system consists of a livestock and poultry waste pretreatment unit, an anaerobic digestion treatment unit, and an anaerobic digestion liquid classification treatment unit. , organic liquid fertilizer base liquid production unit, high temperature compost treatment unit and ecological functional fertilizer production unit; the livestock and poultry waste pretreatment unit includes a manure collection tank, a filter centrifuge for coarse filtration, a first buffer size mixing tank and the first coarse slag concentration sizing tank; the anaerobic digestion treatment unit includes a CSTR system, a UASB system, a two-stage A/O system, an anaerobic digestion liquid buffer tank, a second buffer sizing tank and a sludge sedimentation tank; The anaerobic digestion liquid classification treatment unit includes a primary filtration centrifuge, a secondary filtration centrifuge, a primary separation coarse slag storage tank, a secondary separation fine slag storage tank, a primary separation filtrate intermediate storage tank, and a secondary separation filtrate An intermediate storage tank and a second coarse slag concentration mixing tank; the organic liquid fertilizer base liquid production unit includes a third buffer mixing tank, a mixing reactor, a pressurized pump, a pipeline-type high-shear dispersing emulsifier and a three-stage filtration centrifuge The high-temperature composting treatment unit includes an open fermentation tank, a degassing device and a turning machine; the ecological functional fertilizer production unit is used for the production of functional solid fertilizer raw materials and organic liquid fertilizer base liquid produced by the high-temperature composting treatment unit The functional organic liquid fertilizer raw materials produced by the unit are respectively converted into solid ecological fertilizer and liquid ecological fertilizer; The livestock and poultry wastes are subjected to pulping treatment in the manure collection and pulping tank of the livestock and poultry wastes pretreatment unit to obtain a pulping liquid, and the pulping liquid is subjected to coarse filtration, filtration and separation by using a filter centrifuge for coarse filtration. , to obtain the water separated by coarse filtration and the coarse slag separated by coarse filtration, the water separated by the coarse filtration is transferred into the first buffer sizing tank, and the coarse slag separated by the coarse filtration is transferred into the first coarse slag concentration sizing tank; the The solid content of the sizing liquid in the manure collecting sizing tank is 5-20 wt %; the specification of the filter medium used for the coarse filtration, filtration and separation is 5-8 meshes; The coarse filtration and separation coarse slag is backwashed to obtain the coarse filtration and separation coarse slag after backwashing; wherein, the number of backwashing of the coarse filtration and separation coarse slag is 1 to 2 times, and each time The method for carrying out backwashing of the coarse filtration and separation of coarse slag independently includes: The A/O effluent is transported to the first coarse slag concentration sizing tank to be mixed with the coarse filtration and separated coarse slag to be backwashed to obtain a backwash mixed solution; the first coarse slag concentration sizing tank is backwashed The solid content of the mixed solution is 10-20wt%; The backwash mixed solution is subjected to coarse filtration, filtration and separation by using a filtration centrifuge for coarse filtration, and the obtained backwash effluent enters the first buffer slurry mixing tank and is merged into the coarse filtration and separated effluent. The separated coarse slag is returned to the first coarse slag concentration sizing tank again for the next cycle of reverse flushing; Using A/O effluent to adjust the coarse filtration separation effluent in the first buffer sizing tank to a solid content of 5-10wt%; The crude filtration separated effluent in the first buffer slurry mixing tank is treated with the CSTR process in the CSTR system of the anaerobic digestion treatment unit to obtain anaerobic digestion solution, and the anaerobic digestion is carried out. The liquid is transferred into the anaerobic digestion liquid buffer tank, and the solid content of the anaerobic digestion liquid in the anaerobic digestion liquid buffer tank is 2-5wt%; The anaerobic digestion liquid is subjected to primary filtration and separation by using the primary filtration centrifuge of the anaerobic digestion liquid classification treatment unit to obtain primary separation filtrate and primary separation coarse residue, and the primary separation coarse residue is transferred to the primary separation In the separation coarse slag storage tank, the first-stage separation filtrate is transferred into the first-stage separation filtrate intermediate storage tank; the specification of the filter medium used in the first-stage filtration separation is 12-20 meshes; The primary separation filtrate is subjected to secondary filtration and separation by a secondary filtration centrifuge to obtain secondary separation filtrate and secondary separation fine slag, and the secondary separation fine slag is transferred to the secondary separation fine slag storage tank, so The secondary separation filtrate is transferred into the secondary separation filtrate intermediate storage tank, and the solid content of the secondary separation filtrate in the secondary separation filtrate intermediate storage tank is less than or equal to 2wt%; ~140 mesh; Part of the secondary separation filtrate is used to backwash the primary separation coarse residue to obtain the secondary separation filtrate after backwashing and the primary separation coarse residue after backwashing; The number of times of backwashing is 1 to 2 times, and each time the method of backwashing the first-stage separated coarse slag independently includes: Part of the secondary separation filtrate and the primary separation coarse slag to be backwashed are mixed in the second coarse slag concentration sizing tank to obtain a backwashing mixed solution; the second coarse slag concentration sizing tank is backwashed The solid content of the mixed solution is 5-20wt%; A primary filtration centrifuge is used to carry out primary filtration and separation of the backwashing mixture to obtain primary washing filtrate and primary separation coarse residue after backwashing, and the primary washing filtrate is transferred to primary separation filtrate In the intermediate storage tank, the primary separation coarse slag after the backwash is transferred into the primary separation coarse slag storage tank; A secondary filtration centrifuge is used to carry out secondary filtration and separation of the primary washing filtrate in the intermediate storage tank of the primary separation filtrate to obtain secondary washing fine slag and a secondary separation filtrate after reverse washing. The washing fine slag is transferred into the secondary separation fine slag storage tank and combined with the secondary separation fine slag, and the secondary separation filtrate after the backwash is transferred into the secondary separation filtrate intermediate storage tank; The overflow of the secondary separation filtrate that exceeds the storage capacity of the secondary separation filtrate intermediate storage tank is transferred to the second buffer slurry mixing tank, and the UASB process is used in the UASB system for treatment and the two-stage A/O process is used in the two-stage A/O process. Process in the O system to obtain A/O precipitation sludge and A/O effluent, the A/O precipitation sludge is transferred to the sludge sedimentation tank; the A/O precipitation sludge is returned to the anaerobic digestion solution First-level filtration and separation is performed in the buffer pool; part of the A/O effluent is used for slurrying the livestock and poultry waste and backwashing the coarse filtration and separation coarse residue, and the remaining A/O effluent is discharged up to the standard ; The coarse filter-separated coarse slag after backwashing and the primary separation coarse slag after backwashing are mixed with auxiliary materials, and open-type composting fermentation is carried out in a high-temperature composting treatment unit to obtain functional solid fertilizer raw materials, which are then transferred to ecological The functional fertilizer production unit prepares solid ecological fertilizer; The secondary separation fine slag and the backwashed secondary separation filtrate are processed by the organic liquid fertilizer base liquid production unit to obtain functional organic liquid fertilizer raw materials, which are then transferred to the ecological functional fertilizer production unit to prepare liquid ecological fertilizer. 2. method according to claim 1, is characterized in that, the preparation method of described solid ecological fertilizer comprises: The coarse filtration and separation coarse slag after backwashing, the primary separation coarse slag after backwashing and auxiliary materials are mixed and tempered and open-type composting fermentation is carried out in a high-temperature composting treatment unit to obtain a fermentation product, and the fermentation product is a functional solid fertilizer raw materials, using the fermentation product as a raw material to prepare solid ecological fertilizer; The coarse filtration and separation coarse slag after backwashing and the first-stage separation coarse slag after backwashing are used as the main materials, and the mixing and tempering is to adjust the moisture content of the pile after mixing the main material and the auxiliary material to 55-60 %, and C/N is adjusted to (25-30): 1; the open compost fermentation includes the first fermentation and the second fermentation performed in sequence, the period of the first fermentation is 15-20 d, and the first fermentation It is carried out under aeration conditions, and the ventilation rate is 50-300 L/min; the period of the second fermentation is 25-30 d, and the second fermentation is carried out under non-aeration conditions. 3. method according to claim 1, is characterized in that, the preparation method of described liquid ecological fertilizer comprises: Mixing and dispersing the secondary separation fine slag and the backwashed secondary separation filtrate in the third buffer slurry mixing tank to obtain reverse concentrated slurry mixing; Pump the reverse concentrated slurry into a mixing reactor with a dispersing mixer, start the dispersing mixer, contact, mix and disperse in the closed mixing reactor for 15 to 30 minutes, then start the pressurizing pump and open the pipeline high A shear dispersing emulsifier is used to perform high shear dispersing and emulsifying treatment on the reversely concentrated and slurried liquid in the mixing reactor for 60 to 120 minutes to obtain a dispersing emulsion; The dispersing emulsion is subjected to tertiary filtration and separation by a tertiary filtration centrifuge to obtain tertiary separation filter residue and tertiary separation filtrate; the tertiary separation filter residue is returned to the third buffer slurry mixing tank for mixing and dispersion, so that the The tertiary separation filtrate is a functional organic liquid fertilizer raw material, and liquid ecological fertilizer is prepared by using the tertiary separation filtrate as a raw material. 4. The method according to claim 3, wherein the solid content of the reversely concentrated slurry in the mixing reactor is 10 to 30 wt%; The separation and filtrate mixing and dispersion are carried out under the condition that the rotating speed is 2800-3000 rpm, and the high-shear dispersion and emulsification treatment is carried out under the condition that the rotating speed is 2800-3000 rpm; .

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