CN105776611B - It is not digested object and organic fertilizer base fluid preparation method in removal anaerobic digestion solution - Google Patents

Abstract

The invention discloses a method for classifying and removing large particles of undigested and decomposed organic matter and sediment in anaerobic digestion liquid and preparing organic liquid fertilizer by using the anaerobic digestion liquid after removing large particles of undigested and decomposed organic matter and sediment as raw materials Base method. Among them, the organic matter such as plant fibers such as large particles that have not been digested and decomposed by the classification process, and the inorganic matter such as sediment are used as the initial raw materials for solid biogas manure or soil conditioner, and the anaerobic digested liquid biogas residue and biogas slurry obtained by the classification process The starting material for the preparation of organic liquid fertilizer base liquid. The method provided by the invention can remove large particles of undigested and decomposed plant fibers and other inorganic substances such as silt from the anaerobic digestion solution, and utilize The anaerobic digestion solution is used to prepare organic liquid fertilizer base liquid products, thereby solving the bottleneck problem of resource reuse of anaerobic digestion solution.

Description

Preparation method for removing undigested matter and organic liquid fertilizer base liquid in anaerobic digestion liquid

technical field

The invention relates to the field of resource recovery and utilization, in particular to a method for graded removal of large particles of undigested and decomposed organic matter and sediment in anaerobic digestion liquid and anaerobic digestion after removing large particles of undigested and decomposed organic matter and sediment A method for preparing organic liquid fertilizer base liquid with liquid as raw material.

Background technique

Biogas production by anaerobic fermentation is one of the important ways to effectively utilize biomass resources including livestock and poultry manure and crop straw to obtain biomass energy. At present, with the development of industrialized biogas, the effective utilization and reasonable consumption of anaerobic digestion by-products (biogas residue and biogas slurry mixture), which restricts the economic benefits of large-scale industrialized biogas projects, has become an issue that affects the sustainable development of large-scale biogas projects. Bottleneck problem of commercial operation. The limiting factors of resource utilization of anaerobic digestate are mainly reflected in the following aspects:

1. Anaerobic digestion liquid, a by-product of anaerobic fermentation, generally has the characteristics of large volume and low solid concentration, which has become a key problem that limits the application of anaerobic digestion liquid to fertilizer.

2. Stability of nutrients contained in anaerobic digestion liquid (biogas slurry). Due to the characteristics of anaerobic digestion liquid, there are common problems such as low nutritional content and poor stability, resulting in high production costs and inconvenient transportation and application. Therefore, the stability determines the delivery range and storage time of the anaerobic digestate as a nutrient solution, and determines the economy and feasibility of the fertilizer application of the anaerobic digestate.

3. For solid-liquid separation and conversion of high-humidity solids (biogas residues) into safe solid biogas fertilizers, it is urgent to solve the high moisture content of high-humidity solids (biogas residues), low degree of humification, and virus pathogens and miscellaneous bacteria carried by poultry manure. Inactivation of harmful substances such as grass seeds.

4. For the conversion of solid-liquid separation filtrate (biogas slurry) into safe liquid biogas fertilizer, the concentration of biogas slurry and the activity of biologically active substances, such as water solubility, need to be solved urgently. Although modern ultrafiltration, microfiltration, and reverse osmosis fine processing technologies have solved the problem of biogas slurry concentration technology, due to the complex organic components and unbalanced nutrients in biogas slurry, especially most of the biologically active substances are in a water-insoluble state, such as proteins and amino acids. , Humic acid substances. Therefore, it is necessary to activate the components of liquid biogas manure, activate the biologically active substances in it, and chelate/complex trace elements.

Anaerobic digestion solution refers to the by-products produced by anaerobic fermentation of organic waste such as livestock excrement, urban domestic sewage treatment plant domestic sludge and crop straw. Anaerobic fermentation is a very complex decomposition and conversion process involving many microorganisms. There are very few solubles left in the feed liquid, and most of the solubles are mainly newly produced, various organic substances and various ions. The solid concentration of anaerobic digestion liquid is generally 5%-8%, mainly composed of free water and plant fiber, sediment, bacteria, clay, colloid, pesticide residues, suspended matter and organic matter with a foul smell.

Everything has its duality. On the one hand, the anaerobic digestion solution is directly applied to farmland soil such as crops without harmless and stabilized treatment, which not only does not meet the agricultural hygiene standards and causes secondary pollution of the farmland, but also adversely affects the growth conditions and growth environment of crops. Moreover, the large amount of direct application will inevitably increase transportation costs and labor intensity, not to mention that it will not be fully utilized in non-fertilizer seasons, resulting in the disorderly discharge of excess anaerobic digestion liquid, which will further aggravate environmental pollution and waste of resources. On the other hand, the anaerobic digestate contains a variety of inorganic nutrients and active organic components. Inorganic nutrients include nitrogen, phosphorus, potassium, calcium, magnesium and other elements and a small amount of trace elements. Active organic ingredients include humic acid, indole acetic acid, lactic acid bacteria, gibberellin, cytokinin and other plant hormones and B vitamins, and also contain a variety of amino acids, proteins, hydrolytic enzymes, various inorganic acids and some antibiotics. The mutual coordination between inorganic nutrients and organic components exists in the anaerobic digestive juice in the form of quick-acting nutrients and biological pesticides, which can be directly and quickly absorbed by crops and kill harmful bacteria and insect eggs.

The anaerobic digestion solution is harmless and stabilized, and it is used as a biogas fertilizer. It has obvious effects on the control of aphids in wheat, beans and vegetables, and has a strong inhibitory effect on various crop pathogens. Therefore, the scientific application of biogas fertilizer can increase the content of organic matter and nutrient elements in the soil, improve the soil structure, and improve soil fertility.

Therefore, in order to avoid the spread of diseases and soil pollution, the application of anaerobic digestive juice as a fertilizer needs to be harmless and stabilized before it can be used. This is a prerequisite for the extended application of anaerobic digested liquid fertilizer. Among them, the effective method is to classify and separate large particles that have not been digested and decomposed, unstable organic and inorganic components, and use them as initial raw materials for the production of solid biogas fertilizer or soil conditioner. The separated biogas slurry is concentrated and activated, and is used as the initial raw material for the production of organic liquid fertilizer. Anaerobic digestion solution is a complex mixture of solid phase and liquid phase, in which the relative concentration of undigested substances such as plant fibers is very high, which must be effectively filtered and separated. Although modern solid-liquid separation technology can alleviate the technical problems of solid-liquid separation of anaerobic digestion liquid, they cannot solve the technical problems of graded treatment and fine separation of anaerobic digestion liquid, and all have problems such as high energy consumption, short service life, and high operating costs. All cannot meet the production requirements of large-scale processing and utilization of anaerobic digestate. Even the traditional bioengineering technology, such as high-temperature aerobic fermentation (composting) treatment technology, can only solve the problem of organic high-humidity solids (biogas residue), and a large amount of low-concentration separated water (biogas slurry) still exists. However, it still cannot meet the basic requirements of the application of anaerobic digestate fertilizer. Therefore, it is necessary to combine multi-level and diversified separation technologies, integrate and integrate existing filtration and separation technologies, carry out multi-level and multi-level filtration, classification and concentration of anaerobic digestion liquid, increase the content of organic components and biological activity, reduce crude fiber and The ash content has also become a technical difficulty that must be overcome for the fertilization of anaerobic digested liquid.

Contents of the invention

The first object of the present invention is to solve the above-mentioned problems in the recycling process of anaerobic digestion liquid, and provide a method that can efficiently separate and remove unstable organic and inorganic components that have not been digested and decomposed by large particles in anaerobic digestion liquid Methods.

The second object of the present invention is to provide an organic liquid fertilizer base liquid prepared by using the anaerobic digestion liquid after removing large particles of undigested and decomposed, unstable organic matter and inorganic components as raw material and its preparation method.

In order to achieve the above object, the present invention provides a method for anaerobic digestion solution to remove large particles of undigested and decomposed organic matter and sediment by classification, comprising the following steps:

a) Primary filtration and separation: use 12, 14, 16, 18 or 20 mesh filter centrifuges to perform primary filtration and separation of anaerobic digestion liquid to obtain primary filter residue and primary filtrate, and place the primary filter residue in a The first-level filtrate is placed in the first-level filtrate storage tank;

b) Secondary filtration and separation: use a 100, 120 or 140 mesh filter centrifuge to carry out secondary filtration and centrifugal separation of the primary filtrate to obtain secondary filter residue and secondary filtrate, and place the secondary filter residue in the secondary filter residue In the storage tank, the secondary filtrate is placed in the secondary filtrate storage tank;

c) Backwash large particles of undigested and decomposed organic matter and sediment: combine the liquid in the secondary filtrate storage tank with the large particles of undigested and decomposed organic matter and sediment in the primary undigested and decomposed organic matter and sediment storage tank Mix to obtain a reverse flushing mixture, and use a 12, 14, 16, 18 or 20 mesh filter centrifuge to perform primary filtration and centrifugation on the reverse flushing mixture to obtain a primary flushing of large particles that have not been digested and decomposed organic matter and silt filter residue and primary flushing filtrate, place the primary large particle undigested and decomposed organic matter and silt storage tank in the primary primary flushing large particles of undigested and decomposed organic matter and silt storage tank, utilize 100, A 120 or 140 mesh filter centrifuge performs secondary filtration and centrifugation on the first-level primary flushing filtrate to obtain the secondary filter residue of the primary primary flushing filtrate and the secondary filtrate of the primary primary flushing filtrate, and the primary primary flushing filtrate The secondary filter residue of the filtrate is returned to the secondary filter residue storage tank, and the secondary filtrate of the first-level primary flushing filtrate is returned to the secondary filtrate storage tank to complete a reverse flushing process of large particles that have not been digested and decomposed organic matter and sediment , cycle the above backwashing process for 2-3 times and then return to the primary undigested and decomposed organic matter and sediment storage tank for large particles of undigested and decomposed organic matter and sediment, and return to the secondary filter residue storage tank Among them is the coarse biogas residue that has removed large particles of undigested and decomposed organic matter and sediment, and the biogas slurry that has removed large particles of undigested and decomposed organic matter and sediment is returned to the secondary filtrate storage tank.

In the present invention, the anaerobic digestion liquid is a by-product of anaerobic fermentation of a large-scale industrial biogas project. The large particles of undigested and decomposed organic matter are mainly plant fibers, and the silt is mainly inorganic matter carried into the anaerobic fermentation system by raw materials. Larger particles refer to the oversize of 12, 14, 16, 18 or 20 mesh sieves.

Optionally, the anaerobic digestion solution is a by-product obtained after anaerobic fermentation of at least one of livestock and poultry manure such as cow manure, pig manure, chicken manure, and crop straw (such as corn straw) as raw materials to produce biogas. product.

Wherein, the solid content in the anaerobic digestion liquid is 5-10% by mass.

Preferably, in the primary filtration and separation step, the filter medium of the filter centrifuge used is 12, 14 or 16 mesh, and the motor rotor speed is 1400rmp.

Wherein, in the step of backwashing, the solid content in the backwashing mixed solution is 5-20% by mass.

The present invention also provides a method for the above-mentioned anaerobic digestion liquid classification treatment to remove large particles of undigested and decomposed organic matter and sediment, and resource reuse of anaerobic digestion liquid containing inorganic matter such as large particles of undigested and decomposed organic matter and sediment in the application.

Optionally, the application is to recycle large particles of undigested and decomposed organic matter and sediment as initial raw materials for solid biogas fertilizer or soil conditioner.

The application is to recover large particles of undigested and decomposed organic matter and sediment as the initial raw material of an organic solid biogas fertilizer system and/or livestock and poultry breeding litter and/or a carrier of microorganisms.

Optionally, the application is to recycle bioactive substances and nutrients in coarse biogas residue and/or biogas slurry from which large particles of undigested and decomposed organic matter and sediment have been removed.

It is particularly worth noting that the present invention provides a method for preparing organic liquid fertilizer base liquid by removing large particles of coarse biogas residue and/or biogas slurry that have not been digested and decomposed organic matter and sediment as raw materials, and the method includes the following steps:

(1) Remove large particles of undigested and decomposed organic matter and silt: the method for removing large particles of undigested and decomposed organic matter and silt by using the anaerobic digestion liquid of the present invention removes large particles of undigested and decomposed organic matter and silt Coarse biogas residue of sediment and biogas slurry from which large particles of undigested and decomposed organic matter and sediment have been removed;

(2) Reverse concentration: contact, disperse and mix the coarse biogas residue and biogas slurry in a closed container for 15-30 minutes to obtain a reverse concentrated solution with a solid content of 10-30% by mass;

(3) Activate biologically active substances: perform high-frequency high-shear dispersion and emulsification treatment on the reverse concentrated solution for 60-120 minutes to obtain a highly physiologically active anaerobic digestion concentrated solution;

(4) Three-stage filtration and separation: use a 170 or 200 mesh filter centrifuge to perform three-stage filtration and separation on the highly physiologically active anaerobic digestion concentrate to obtain a three-stage filter residue and a three-stage filtrate. Active organic liquid fertilizer base liquid.

Wherein, the method further includes returning the third-stage filter residue to the secondary filter residue storage tank to combine with the coarse biogas residue, and then contacting biogas slurry to disperse and mix for the next cycle of reverse concentration treatment.

Among them, in the process of reverse concentration and activation of biologically active substances, it is preferable to use a batch-type jet flow dispersing mixer to combine the coarse biogas residue from the removal of large particles that have not been digested and decomposed organic matter and sediment with the removal of large particles that have not been digested. The biogas slurry that digests and decomposes organic matter and sediment is fully dispersed and mixed for 15-30 minutes, and the uniformly dispersed and mixed reverse concentrate is preferably entered into a pipeline-type high-shear dispersing emulsifier for reciprocating, high-frequency, high-shear dispersing and emulsifying for 60-120 minutes. Activates biologically active substances in reverse concentrate. The rotor speed of the intermittent jet flow dispersing mixer and the pipeline high shear dispersing emulsifier is preferably 2900 rpm.

More specifically: the material in the container is driven by the high-speed rotating rotor of the jet-flow dispersion mixer, and the water-insoluble matter in the material generates a strong vertical liquid circulation under the action of the rotor guide cavity, forcing the water in the material to The insoluble matter circulates in the tank container as a whole to achieve macroscopic mixing. At the same time, the high-speed rotating rotor produces the shear turbulent flow that microscopic mixing needs to achieve. The liquid that has been mixed with microscopic turbulent flow is dispersed to every corner of the tank container along with the circulation of the overall liquid flow, which promotes the turbulence in the material in the tank container. Water-insoluble substances can be thoroughly dispersed and mixed, which is completely different from the traditional mixer.

Further: the thoroughly dispersed and mixed "reverse concentrate" processed by the jet-flow dispersing mixer enters the pipeline-type high-shear dispersing emulsifier, and the high tangential speed and high-frequency mechanical force produced by its high-speed rotating rotor The strong kinetic energy is generated under the effect, and the immiscible solid phase, liquid phase, and gas phase in the "reverse concentrated solution" are forced to be subjected to strong mechanical and hydraulic shearing and centrifugal extrusion in the narrow gap between the stator and the rotor. Under the combined effects of pressure, liquid layer friction, impact tearing and turbulence, it can be instant, uniform, fine, dispersed and emulsified. The reverse concentrated liquid that removes large particles of undigested and decomposed organic matter and sediment is usually immiscible with each other. The role of the pipeline high-shear dispersing emulsifier is to efficiently, quickly and efficiently mix the liquid in the container. Evenly distributed from one phase or multiple phases to another continuous phase, and finally a stable high-quality product is obtained.

On the other hand, the reverse concentrated biogas slurry that removes large particles of undigested and decomposed organic matter and sediment is combined with a jet-flow dispersing mixer and a pipeline-type high-shear dispersing emulsifier, "reverse concentrated biogas slurry Active substances such as crude protein and macromolecular humic acid (HA) in the "was subjected to violent collision and tearing, and the crude protein was cracked to produce a large number of small molecular free amino acid water-soluble or water-insoluble substances, and the macromolecular humic acid (HA) was cracked to produce a large number of small Molecular fulvic acid water-soluble or water-insoluble matter is dissolved or dispersed in the reverse concentrated biogas slurry that removes large particles of undigested and decomposed organic matter and sediment, and then undergoes three-stage filtration through a 170 or 200 mesh filter centrifuge Separation, the "tertiary filter residue" (fine biogas residue) returns to the "secondary filter residue" (coarse biogas residue) storage tank and enters the next cycle of reverse concentration treatment, and the "tertiary filtrate" is an organic substance with high physiological activity Liquid fertilizer base liquid (mother liquid) product.

The organic liquid fertilizer base liquid obtained by the preparation method of the present invention also belongs to the protection scope of the present invention.

Part of the content of the present invention uses at least one of cow dung, pig manure, chicken manure and crop stalks (mainly corn stalks) as raw materials for anaerobic fermentation to produce biogas. The main components of the by-product anaerobic digestion liquid are as follows: An example is used to illustrate that the main undigested and decomposed organic matter is mainly plant fiber, and the sediment is mainly inorganic matter carried into the anaerobic fermentation system by raw materials or feed. However, it should be noted that the scope of application of the present invention cannot be limited by this, and the present invention is also applicable to the treatment of other anaerobic digestion liquids containing large particles of undigested and decomposed organic matter and/or inorganic matter such as sediment.

It should be understood that in the present invention, attributives such as primary, secondary, and tertiary are only used to distinguish different processing processes and different materials, and are not used to strictly represent the specific sequence of processing processes and the sequence of obtaining materials .

The flow chart of removing large particles of undigested and decomposed organic matter and sediment in the anaerobic digestion solution is shown in Figure 1. The flow chart of preparing organic liquid fertilizer base liquid from coarse biogas residue and biogas slurry after removing large particles of undigested and decomposed organic matter and sediment is shown in Figure 2.

The present invention has following advantage and beneficial effect:

1. According to the characteristics of the components of the initial anaerobic digestion liquid, the present invention selects a process route for graded treatment to remove large particles in the initial anaerobic digestion liquid that have not been digested and decomposed organic matter and sediment, and can use it to remove large particles The anaerobic digestion liquid that has not been digested and decomposed organic matter and sediment is used as a raw material to prepare organic liquid fertilizer base liquid products. Among them, the key technology is "double reverse" and "one activation" technology.

(1) Backwash technology. Use the liquid in the secondary filtrate storage tank under the 100, 120 or 140 mesh sieve as large particles of undigested and decomposed organic matter and sediment flushing agent to backwash the large particles of undigested and decomposed organic matter and sediment for 2-3 times, It avoids large particles of undigested and decomposed organic matter and silt attached "digest residue" from being carried out of the system.

(2) reverse concentration technology. Add coarse biogas residue on 100, 120 or 140 mesh sieve, 12, 14, 16, 18 or 20 mesh sieve to the biogas slurry in the secondary filtrate storage tank to remove large particles that have not been digested and decomposed organic matter and sediment , Increase the concentration of biologically active substances and nutrients in the biogas slurry in the secondary filtrate storage tank that removes large particles of undigested and decomposed organic matter and sediment.

(3) Active substance activation technology. The high-frequency high-shear dispersion emulsification technology is used to activate the active substances in the reverse concentrated biogas slurry, which improves the efficacy of the subsequent preparation of organic liquid fertilizer base liquid (mother liquid) products.

2. Use 12, 14, 16, 18 or 20 mesh filter centrifuges to separate large particles in the initial anaerobic digestion liquid that have not been digested and decomposed organic matter and sediment, reducing the crude fiber, especially lignin, of organic liquid fertilizer base liquid products It improves the content and application range of organic components such as crude protein, amino acids, and humic acid in the anaerobic digestion solution that removes large particles of undigested and decomposed organic matter and sediment. Compared with the initial anaerobic digestion solution, the crude protein is increased by 50% (accounting for the percentage of dry basis), and the crude fiber is reduced by 50% (accounting for the percentage of dry basis), which solves the problem of undigested and decomposed organic matter and sludge of large particles in the initial anaerobic digestion solution. The problem of high sand content and difficult disposal has been realized, and the initial anaerobic digestion liquid has been fertilized, commercialized and high-quality.

3. The present invention is based on the compositional characteristics of the initial anaerobic digested liquid, especially the anaerobic digested liquid obtained by anaerobic fermentation with biogas produced from raw materials such as cow dung, pig manure, chicken manure and crop stalks (mainly corn stalks), A process route for graded treatment to remove large particles of undigested and decomposed organic matter and sediment in the initial anaerobic digestion liquid was selected, and the large particles of undigested and decomposed organic matter and sediment separated from the initial anaerobic digestion liquid were regarded as organic solids The initial raw materials of the biogas fertilizer system and/or livestock and poultry breeding litter and/or microbial carriers are used.

4. The preparation process of organic liquid fertilizer base liquid chooses a process route of physically activating active substances, which effectively improves the content of various amino acids, humic acid (especially fulvic acid) and other organic acids in the organic liquid fertilizer base liquid (mother liquid) products And the safety of the ecological environment provides a basis for the synergistic treatment process of anaerobic digestion liquid. It can be applied to large-scale production, and has low cost and simple operation.

5. The organic liquid fertilizer base liquid product produced by intermittent jet flow dispersing mixer, pipeline high-shear dispersing emulsifying machine reciprocating, and high-frequency dispersing and emulsifying technology has high physiological activity and high stability. It is rich in small molecular weight amino acids, fulvic acid and other organic acid water-soluble substances, which can not only maintain the stability of its product pH, NPK and trace elements required for the growth of hypertrophic plants, but also promote the growth of plant roots as a growth regulator. Development, stimulate plant growth, promote photosynthesis.

6. The organic liquid fertilizer base liquid (mother liquid) is a suspension product under a 170/200 mesh sieve, and the particle size of insoluble solid particles is ≤0.089mm/0.0740mm, which can ensure that it meets the requirements of spray and drip irrigation equipment.

The invention integrates multiple functions, can efficiently and timely process a large amount of discharged anaerobic digestion liquid, purifies the environment, reduces pollution, and improves economic benefits, and can be widely used in large-scale biogas engineering anaerobic fermentation by-product anaerobic digestion liquid (biogas residue, biogas slurry mixture) treatment and disposal process.

The present invention will be further described below in conjunction with embodiment.

Description of drawings

Figure 1 is a flow chart for removing large particles of undigested and decomposed organic matter and sediment in anaerobic digestion liquid.

Fig. 2 is a flow chart of preparing organic liquid fertilizer base liquid from coarse biogas residue and biogas slurry after removal of large particles of undigested and decomposed organic matter and sediment.

In Fig. 1 and Fig. 2, (1) the solid line direction is the positive direction. (2) The direction of the dotted line is the opposite direction, which consists of reverse flushing and reverse concentration. (3) The direction of the dotted line is the activation direction of the active material.

Detailed ways

Specific embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings. It should be understood that the specific embodiments described here are only used to illustrate and explain the present invention, and are not intended to limit the present invention.

Example 1:

This example is used to illustrate the graded treatment of anaerobic digestion liquid and use it to remove large particles of undigested and decomposed organic matter and sediment (coarse biogas residue and biogas slurry obtained after removing large particles of undigested and decomposed organic matter and sediment) The method for preparing organic liquid fertilizer base liquid as raw material comprises the following steps:

(1) Remove large particles of undigested and decomposed organic matter and sediment: the anaerobic digestion solution (solid content 8%) is pumped into the LX-950-12 mesh filter centrifuge through the pipeline for primary filtration and separation. Among them, the "first-level filter residue" (large particles of undigested and decomposed organic matter and sediment) enters the first-level large-particle undigested and decomposed organic matter and sediment storage tank, and the first-level filtrate enters the first-level filtrate storage tank for treatment. The "primary filtrate" is pumped from the storage tank to the LX-950-120 mesh filter centrifuge for secondary filtration and separation treatment. Among them, the "secondary filter residue" (coarse biogas residue) on the 120-mesh sieve and under the 12-mesh sieve enters the secondary filter residue storage tank, and the secondary filtrate under the 120-mesh sieve enters the secondary filtrate storage tank for treatment. The "secondary filtrate" under the 120-mesh sieve is used as a backwashing agent for "large particles of undigested and decomposed organic matter and sediment" and returned to the primary large particle undigested and decomposed organic matter and sediment storage tank with stirring. The undigested and decomposed organic matter and sediment are mixed, stirred and diluted, the solid content is controlled to be less than or equal to 20%, stirred for 10 minutes, and mixed evenly, so that the large particles of undigested and decomposed organic matter and sediment surface attachments enter the secondary filtrate, Obtain the backwash mixture, pump the backwash mixture into the LX-950-12 mesh filter centrifuge, and perform the first primary filter centrifugal backwash "large particles that have not been digested and decomposed organic matter and sediment". First-level flushing of large particles of undigested and decomposed organic matter and sediment filter residues are returned to the first-level large particles of undigested and decomposed organic matter and sediment storage tanks to be mixed with the materials therein, and the first "first-level primary flushing filtrate" is repeated Get back to the 120-mesh filter centrifuge and carry out secondary filtration centrifugation to obtain the secondary filtrate of the primary primary flushing filtrate and the secondary filtrate of the primary primary primary flushing filtrate. Among them, the secondary filter residue of the first-level flushing filtrate returns to the secondary filter residue storage tank to mix with the materials in the secondary filter residue storage tank, and the secondary filtrate of the primary primary flushing filtrate returns to the secondary filtrate storage tank and the secondary filtrate storage tank. The materials in the tank are mixed to complete the first reverse flushing process of undigested and decomposed organic matter and sediment with large particles. The materials in the primary filtrate storage tank are mixed to circulate the above-mentioned reverse flushing process. The reverse flushing process is carried out 3 times. After the end, the primary large particles are not digested and decomposed. 98% of large particles have not been digested and decomposed organic matter and sediment, and the materials in the secondary filter residue storage tank and the material in the secondary filtrate storage tank are coarse biogas residues with 100% removal rate of large particles of undigested and decomposed organic matter and sediment and biogas slurry. The clean and large particles of undigested and decomposed organic matter and sediment are dried and crushed and returned to the livestock and poultry farm for litter reuse or as a carrier of microorganisms and returned to the organic solid biogas fertilizer system for utilization.

(2) Production of organic liquid fertilizer base liquid: the "biogas slurry that removes large particles of undigested and decomposed organic matter and sediment" that has completed the backwashing task is pumped from the storage tank to a closed, intermittent jet flow dispersion mixing Add the coarse biogas residue on the 120-mesh sieve and the 12-mesh sieve to the mixing reactor of the machine (Shanghai Fluke FAB series), control the solid content to be less than or equal to 20%, stir and mix for 15 minutes to obtain the reverse concentrate , Start the pipeline high-shear dispersing emulsifier (Shanghai Fluke FDX1 series), perform high-frequency high-shear dispersing and emulsifying for 120 minutes, obtain high physiological activity anaerobic digestion concentrate, and then pump it to LX-950-170 through pipeline A filter centrifuge is used for three-stage filtration and separation treatment. Among them, the "tertiary filter residue" (fine biogas residue) on the 170-mesh sieve and under the 120-mesh sieve is returned to the secondary filter residue storage tank to enter the next cycle of reverse concentration treatment, and the "tertiary filtrate" under the 170-mesh sieve "It is the base liquid (mother liquid) product of organic liquid fertilizer with high physiological activity. Detect the bioactive substances and nutritional components in the organic liquid fertilizer base liquid products, wherein the organic matter content is 100g/L, and the total nutrient (N+P ₂ O ₅ +K ₂ O) content is 60g/L.

Example 2:

This example is used to illustrate the graded treatment of anaerobic digestion liquid and use it to remove large particles of undigested and decomposed organic matter and sediment separation (coarse biogas residue and biogas slurry obtained after removing large particles of undigested and decomposed organic matter and sediment) The method for preparing organic liquid fertilizer base liquid as raw material comprises the following steps:

(1) Removal of large particles of undigested and decomposed organic matter and sediment: the anaerobic digestion solution (solid content 5%) is pumped through the pipeline into the LX-950-16 mesh filter centrifuge for primary filtration and separation. Among them, the "first-level filter residue" (large particles of undigested and decomposed organic matter and sediment) enters the first-level large-particle undigested and decomposed organic matter and sediment storage tank, and the first-level filtrate enters the first-level filtrate storage tank for treatment. The "primary filtrate" is pumped from the storage tank through the pipeline to the LX-950-140 mesh filter centrifuge for secondary filtration and separation treatment. Among them, the "secondary filter residue" (coarse biogas residue) on the 140-mesh sieve and under the 16-mesh sieve enters the secondary filter residue storage tank, and the secondary filtrate under the 140-mesh sieve enters the secondary filtrate storage tank for treatment. The "secondary filtrate" under the 140-mesh sieve is used as a backwashing agent for "large particles of undigested and decomposed organic matter and sediment" and returned to the primary large particle undigested and decomposed organic matter and sediment storage tank with agitation. Mix the undigested and decomposed organic matter with the sediment, stir and dilute, control the solid content to 20%, stir for 10 minutes, and mix evenly, so that the large particles of undigested and decomposed organic matter and the attachments (digest residue) on the surface of the sediment enter the secondary filtrate In the process, the backwash mixture is obtained, and the backwash mixture is pumped into the LX-950-16 mesh filter centrifuge for the first primary filtration centrifugal backwash "large particles are not digested and decomposed organic matter and sediment ". The first-level primary flushing of large particles of undigested and decomposed organic matter and sediment filter residues are returned and the large particles of undigested and decomposed organic matter and sediment storage tanks are mixed with the materials therein, and the first "first-level primary flushing filtrate" is returned again Go to a 140-mesh filter centrifuge for secondary filtration and centrifugation to obtain the secondary filter residue of the primary primary flushing filtrate and the secondary filtrate of the primary primary flushing filtrate. Among them, the secondary filter residue of the first-level flushing filtrate returns to the secondary filter residue storage tank to mix with the materials in the secondary filter residue storage tank, and the secondary filtrate of the primary primary flushing filtrate returns to the secondary filtrate storage tank and the secondary filtrate storage tank. The materials in the tank are mixed to complete the first reverse flushing process of undigested and decomposed organic matter and sediment with large particles. The materials in the first-stage filtrate storage tank are mixed to circulate the above-mentioned backwashing process. The backwashing process is carried out three times. 98% of large particles have not been digested and decomposed organic matter and sediment, and the materials in the secondary filter residue storage tank and the materials in the secondary filtrate storage tank are respectively coarse biogas with 100% large particle undigested and decomposed organic matter and sediment removal rate slag and sludge. The clean large particles that have not been digested and decomposed organic matter and sediment are dried and crushed and returned to the livestock and poultry farm for litter reuse or as a carrier of microorganisms and returned to the organic solid biogas fertilizer system for utilization.

(2) Production of organic liquid fertilizer base liquid: the "biogas slurry that removes large particles of undigested and decomposed organic matter and sediment" that has completed the backwashing task is pumped from the storage tank to a closed, intermittent jet flow dispersion mixing Add the coarse biogas residue on the 140-mesh sieve and the 16-mesh sieve to the mixing reactor of the machine (Shanghai Fluke FAB series), control the solid content to be less than or equal to 20%, fully disperse and mix for 30 minutes to obtain the reverse concentrate , start the pipeline high-shear dispersing emulsifier (Shanghai Fluke FDX1 series), carry out high-frequency high-shear dispersing and emulsifying for 60 minutes, obtain the concentrated liquid of anaerobic digestion with high physiological activity, and then pump it to LX-950-200 through pipeline A filter centrifuge is used for three-stage filtration and separation treatment. Among them, the "tertiary filter residue" (fine biogas residue) on the 200-mesh sieve and under the 140-mesh sieve is returned to the secondary filter residue storage tank to enter the next cycle of reverse concentration treatment, and the "tertiary filtrate" under the 200-mesh sieve "It is the base liquid (mother liquid) product of organic liquid fertilizer with high physiological activity. The biologically active substances and nutritional components in the organic liquid fertilizer base liquid products were detected. Among them, the organic matter content was 120g/L, and the total nutrient (N+P ₂ O ₅ +K ₂ O) content was 65g/L.

Although the present invention has been described in detail with general descriptions and specific embodiments above, it is obvious to those skilled in the art that some modifications or improvements can be made on the basis of the present invention. Therefore, the modifications or improvements made on the basis of not departing from the spirit of the present invention all belong to the protection scope of the present invention.

Claims (10)

1. a kind of method that anaerobic digestion solution classification removal bulky grain is not digested decomposing organic matter and silt, which is characterized in that Include the following steps：

A) by-pass filtration detaches：By-pass filtration point is carried out to anaerobic digestion solution using 12,14,16,18 or 20 mesh filtering centrifuges From the level-one filter residue is placed in level-one bulky grain and is not digested decomposing organic matter and mud by acquisition level-one filter residue and level-one filtrate In husky storage tank, the level-one filtrate is placed in level-one filtrate tank；

B) secondary filtration detaches：Secondary filtration centrifugation is carried out to the level-one filtrate using 100,120 or 140 mesh filtering centrifuges Separation obtains two level filter residue and two level filtrate, the two level filter residue is placed in two level filter residue storage tank, the two level filtrate is set In two level filtrate tank；

C) back flush bulky grain is not digested decomposing organic matter and silt：By liquid and the level-one in two level filtrate tank not by Bulky grain in digestion decomposing organic matter and silt storage tank is not digested decomposing organic matter and silt mixing, and it is mixed to obtain back flush Liquid is closed, by-pass filtration centrifugation is carried out to the back flush mixed liquor using 12,14,16,18 or 20 mesh filtering centrifuges, It obtains level-one once flushing bulky grain and is not digested decomposing organic matter and silt filter residue and level-one once flushing filtrate, by described one Grade once flushing bulky grain is not digested decomposing organic matter and silt filter residue is placed in level-one bulky grain and is not digested decomposing organic matter In silt storage tank, using 100,120 or 140 mesh filtering centrifuges to the level-one once flushing filtrate carry out secondary filtration from The heart detaches, and the two level filtrate of the two level filter residue and level-one once flushing filtrate of level-one once flushing filtrate is obtained, by the level-one The two level filter residue of once flushing filtrate returns to two level filter residue storage tank, and the two level filtrate of the level-one once flushing filtrate is returned to two Grade filtrate tank completes the back flush procedure that a bulky grain is not digested decomposing organic matter and silt, recycles above-mentioned reversed Returning to level-one after flushing process 2-3 times and not being digested in decomposing organic matter and silt storage tank is that bulky grain is not digested decomposition and has The isolates such as machine object and silt, to return in two level filter residue storage tank be to eliminate bulky grain not to be digested decomposing organic matter and silt Thick biogas residue, to return in two level filtrate tank be the biogas slurry for eliminating bulky grain and not being digested decomposing organic matter and silt.

2. according to the method described in claim 1, it is characterized in that, in by-pass filtration separating step, it is used filter from The filter medium of scheming is 12,14 or 16 mesh, and rotor rotating speed is 1400rmp.

3. according to the method described in claim 2, it is characterized in that, solid content is 5-20 matter in the back flush mixed liquor Measure %.

4. method according to claim 1 or 2, which is characterized in that solid content is 5-10% in the anaerobic digestion solution.

5. the method described in any one of claim 1-4 is in the anaerobism for not being digested decomposing organic matter and silt containing bulky grain Application in the recycling recycling of digestive juice.

6. application according to claim 5, which is characterized in that the application be recycling bulky grain be not digested decompose it is organic The initial feed and/or livestock and poultry cultivation bedding and padding and/or microorganism carrier of object and silt as organic solid natural pond fertilizer system.

7. application according to claim 5, which is characterized in that the application eliminates bulky grain for recycling and do not disappeared Change the bioactive substance and nutritional ingredient in the thick biogas residue and/or biogas slurry of decomposing organic matter and silt.

8. be not digested the thick biogas residue and/or biogas slurry of decomposing organic matter and silt to remove bulky grain prepares organic fertilizer as raw material The method of base fluid, which is characterized in that the described method comprises the following steps：

(1) removal bulky grain is not digested decomposing organic matter and silt：Utilize the method described in any one of claim 1-4 Acquisition, which eliminates bulky grain and is not digested the thick biogas residue of decomposing organic matter and silt and eliminates bulky grain, is not digested decomposition The biogas slurry of organic matter and silt；

(2) reversed concentration：Thick biogas residue and biogas slurry are contacted into dispersion mixing 15-30min in closed container, obtaining solid content is The reversed concentrate of 10-30 mass %；

(3) bioactive substance is activated：High frequency high cut disperse emulsification is carried out to the reversed concentrate and handles 60-120min, Obtain high physiological activity anaerobic digestion concentrate；

(4) three-stage filtration detaches：Using 170 or 200 mesh filtering centrifuges to the high physiological activity anaerobic digestion concentrate into Row three-stage filtration detaches, and obtains three-level filter residue and three-level filtrate, and the three-level filtrate is high physiological activity organic fertilizer base fluid.

9. according to the method described in claim 8, it is characterized in that, the method further includes that the three-level filter residue is returned to two level After merging with the thick biogas residue in filter residue storage tank, then is contacted with biogas slurry and disperse the reversed concentration that mixing carries out subsequent cycle.

10. the organic fertilizer base fluid product prepared using the method described in claim 8 or 9.