阅读说明：本技术 一种畜禽粪污处理方法 (Livestock and poultry manure treatment method ) 是由 施兵 周斌 于 2019-09-24 设计创作，主要内容包括：本发明公开了一种畜禽粪污处理方法,至少包括固液分离系统、厌氧发酵系统、沼液浓缩系统和异位床好氧发酵系统,其利用固液分离系统将所述畜禽粪污进行固液分离；将固液分离出的液体进行通过厌氧发酵系统进行厌氧发酵,将固液分离出的固体送入异位床好氧发酵系统；将厌氧发酵后的沼液通过沼液浓缩系统进行浓缩分离；将浓缩分离后的富养分有机质浓缩液送入固液分离出的固体为垫料的异位床好氧发酵系统或制作液体有机肥,采用本发明的技术方案可以减少设备投资及维护成本,生产一种新型的固体肥料,将养分肥料化,减少沼液养分(降低污染物浓度),增加单位面积农田消纳量。(The invention discloses a livestock and poultry manure treatment method, which at least comprises a solid-liquid separation system, an anaerobic fermentation system, a biogas slurry concentration system and an heterotopic bed aerobic fermentation system, wherein the livestock and poultry manure is subjected to solid-liquid separation by using the solid-liquid separation system; carrying out anaerobic fermentation on the liquid obtained by solid-liquid separation through an anaerobic fermentation system, and sending the solid obtained by solid-liquid separation into an heterotopic bed aerobic fermentation system; concentrating and separating the biogas slurry after anaerobic fermentation by a biogas slurry concentration system; the nutrient-rich organic matter concentrated solution after concentration and separation is sent into an heterotopic bed aerobic fermentation system taking solid obtained by solid-liquid separation as padding or is used for manufacturing liquid organic fertilizer.)

1. A livestock and poultry manure treatment method at least comprises a solid-liquid separation system, an anaerobic fermentation system, a biogas slurry concentration system and an heterotopic bed aerobic fermentation system, and is characterized by further comprising the following steps:

carrying out solid-liquid separation on the livestock and poultry manure by using a solid-liquid separation system;

carrying out anaerobic fermentation on the liquid obtained by solid-liquid separation through an anaerobic fermentation system, and sending the solid obtained by solid-liquid separation into an heterotopic bed aerobic fermentation system;

concentrating and separating the biogas slurry after anaerobic fermentation by a biogas slurry concentration system;

and (3) feeding the concentrated nutrient-rich organic matter solution after concentration and separation into an ectopic bed aerobic fermentation system with the solid-liquid separated solid as packing or directly preparing a liquid organic fertilizer.

2. The method for treating livestock and poultry manure according to claim 1, wherein the solid-liquid separation system comprises at least two-stage filtration.

3. The method for treating livestock and poultry manure according to claim 1, wherein the biogas slurry after anaerobic fermentation is subjected to solid-liquid separation by another solid-liquid separation system, the solids obtained by the solid-liquid separation are also fed into the heterotopic bed aerobic fermentation system, and the biogas slurry obtained by the solid-liquid separation is fed into a biogas slurry concentration system.

4. The livestock and poultry manure treatment method according to any one of claims 1 to 3, wherein the biogas slurry concentration system is used for concentrating the anaerobic fermentation biogas slurry by membrane concentration, and the membrane used in the biogas slurry concentration system does not include a reverse osmosis membrane.

5. The method for treating livestock and poultry manure according to claim 4, wherein the biogas slurry after anaerobic fermentation is concentrated by at least 10 times by adopting membrane concentration.

6. The livestock and poultry manure treatment method according to any one of claims 1 to 3, wherein the concentrated clear liquid obtained after concentration and separation by the biogas slurry concentration system can be directly returned to field or discharged.

7. The livestock and poultry manure treatment method according to any one of claims 1 to 3, characterized in that the nutrient-rich organic matter concentrated solution is uniformly sprayed on the padding.

Technical Field

The invention relates to the field of waste recycling, in particular to a method for treating livestock and poultry manure.

Background

At present, the traditional treatment modes of livestock and poultry breeding wastes are mainly divided into two types: firstly, tank type anaerobic fermentation is carried out, livestock and poultry manure generated by cultivation enters an anaerobic fermentation system, biogas slurry and biogas residues are mainly generated, however, for the utilization of the biogas, the fermentation of a small biogas project is difficult to continuously operate, the investment of a large biogas project is large, the operation is complex, the nutrients of the generated biogas slurry are high, under normal conditions, the COD of the biogas slurry after the fermentation of the livestock and poultry manure reaches 10000mg/L, the COD of the biogas slurry after the fermentation of the live pig manure reaches 6000mg/L, and a large amount of land is required to be matched for carrying and consumption; secondly, carrying out aerobic fermentation on the heterotopic bed, wherein padding such as straw or rice husk is needed, then spraying the livestock and poultry manure on the padding, adding a strain, and carrying out aerobic fermentation. The process has high requirements on the excrement, the excrement has certain fluidity and is convenient to spray, the solid content is high (the solid content is required to be more than 10%), a large amount of padding is needed, the temperature of a fermentation bed is reduced by water brought by the fluidity, the fermentation is difficult, the management is particularly difficult in winter, and the bed is frequently rotten and died. Obviously, the existing treatment mode of livestock and poultry breeding wastes has various defects.

Disclosure of Invention

In order to solve the problems in the prior art, the technical scheme of the invention provides a livestock and poultry manure treatment method. The technical scheme is as follows:

the livestock and poultry manure treatment method at least comprises a solid-liquid separation system, an anaerobic fermentation system, a biogas slurry concentration system and an heterotopic bed aerobic fermentation system, and comprises the following treatment steps:

carrying out solid-liquid separation on the livestock and poultry manure by using a solid-liquid separation system; carrying out anaerobic fermentation on the liquid obtained by solid-liquid separation through an anaerobic fermentation system, and sending the solid obtained by solid-liquid separation into an heterotopic bed aerobic fermentation system; concentrating and separating the biogas slurry after anaerobic fermentation by a biogas slurry concentration system; and (3) feeding the concentrated nutrient-rich organic matter solution after concentration and separation into an ectopic bed aerobic fermentation system with the solid-liquid separated solid as packing or directly preparing a liquid organic fertilizer.

Further, the solid-liquid separation system comprises at least two stages of filtration.

Further, the biogas slurry after anaerobic fermentation is subjected to solid-liquid separation through another solid-liquid separation system, the solid separated from the solid is also sent to an heterotopic bed aerobic fermentation system, and the biogas slurry separated from the solid is sent to a biogas slurry concentration system.

Further, the biogas slurry concentration system adopts membrane concentration to concentrate the biogas slurry after anaerobic fermentation, and a reverse osmosis membrane is not included in the membrane adopted in the biogas slurry concentration system.

Further, the biogas slurry after anaerobic fermentation is concentrated by at least 10 times by adopting membrane concentration.

Further, the concentrated clear liquid obtained after concentration and separation by the biogas slurry concentration system can be directly returned to the field or discharged.

Further, the nutrient-rich organic matter concentrated solution is uniformly sprayed on the padding.

Compared with the prior art, the technical scheme of the invention at least has the following beneficial effects:

(1) the treatment method of the invention has no excessive limitation on the requirements of raw materials, and is basically suitable for the livestock and poultry manure in most cases.

(2) The invention skillfully takes the solid separated from the solid as the padding in the aerobic fermentation system of the heterotopic bed, combines the nutrient-rich organic matter concentrated solution to prepare the solid organic fertilizer, and grafts the nutrient of the concentrated solution into the solid fertilizer to obtain the high-quality solid organic fertilizer.

(3) The treatment method effectively reduces the fertilizer effect nutrients (pollutant concentration) in the biogas slurry, and reduces the land required for dissolving the biogas slurry or the treatment difficulty; meanwhile, the nutrient content in the solid fertilizer is increased, and the solid fertilizer is changed into a high-quality high-efficiency organic fertilizer; the method can also reduce the transportation cost of the liquid fertilizer, is particularly suitable for the concentrated treatment and utilization of the livestock and poultry manure by a third party in areas with high breeding density, insufficient consumed land or no consumed land, is suitable for large-area popularization, and has immeasurable important value and significance for solving the pollution of the medium-sized and small-sized and distributed livestock and poultry breeding in China.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

FIG. 1 is a flow chart of a livestock and poultry manure treatment process according to an embodiment of the present invention;

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

As shown in fig. 1, which is a flow chart of a livestock and poultry manure treatment process provided in the embodiment of the present invention, the process flow of the "solid-liquid separation + anaerobic fermentation + biogas slurry concentration + grafting high nutrient solid fertilizer fermentation technology" adopted in the embodiment of the present invention includes a solid-liquid separation (secondary filtration) system, a low concentration anaerobic fermentation system, a biogas slurry concentration system, and a grafting strain tank type aerobic fermentation system.

The solid-liquid separation (secondary filtration) system mainly separates solid macromolecular organic matters through two stages of solid-liquid separation, reduces the macromolecular organic matters to the anaerobic fermentation system, and solves the problem of high nutrient in biogas slurry;

the low-concentration anaerobic fermentation system decomposes organic matters in the separated liquid dung again through anaerobic strains and an anaerobic environment to generate methane, decomposes the residual macromolecular organic matters into micromolecular nutrients which are easy to absorb by plants, passivates heavy metals and kills other harmful flora;

the biogas slurry concentration system mainly concentrates nutrients in low-concentration biogas slurry through membrane concentration or other separation equipment, the concentration times can reach at least more than 10 times, organic matters or pollutants in concentrated clear liquid are reduced, the nutrients in the biogas slurry are effectively collected, the high-concentration concentrated nutrients are added into solid fertilizer for utilization, and the low-concentration concentrated clear liquid can be directly returned to the field or used as irrigation water or water treatment for up-to-standard discharge; the high-concentration process technology is mainly used for intercepting most organic matters through ultrafiltration and nanofiltration technologies, and a reverse osmosis technology is not used in the embodiment, because the reverse osmosis can cause salt concentration, the land is returned to the field, and the salinization of the land is easily caused;

the grafted strain groove type aerobic fermentation system mainly uses the heterotopic bed fermentation principle as a main principle, uniformly sprays concentrated solution of high-concentrated nutrients to the fermented solid fertilizer, removes redundant water by utilizing fermentation heat, and grafts the nutrients into the solid fertilizer.

The specific processing method in this embodiment is as follows:

uniformly stirring the livestock and poultry manure, sending the mixture into a solid-liquid separation primary system to obtain microfiltration concentrated liquid and microfiltration liquid (clear liquid), wherein the microfiltration concentrated liquid directly enters an anaerobic fermentation system, the microfiltration concentrated liquid is subjected to solid-liquid separation again through a solid-liquid separation secondary system, the separated liquid enters the solid-liquid separation primary system again for recycling, and the separated livestock and poultry manure residues enter a grafting strain groove type aerobic fermentation system to obtain a solid organic fertilizer;

carrying out anaerobic fermentation on the microfiltration liquid entering the anaerobic fermentation system to obtain biogas and biogas slurry, wherein the biogas can be used for fermentation heating, solid fertilizer drying, power generation self-use and the like, the biogas slurry is subjected to solid-liquid separation again, and the separated biogas residue enters a grafting strain groove type aerobic fermentation system to obtain a solid organic fertilizer; the separated biogas slurry enters a biogas slurry concentration system;

directly irrigating the concentrated clear liquid after concentration and returning the concentrated clear liquid to the field, uniformly spraying the nutrient-rich concentrated liquid after concentration and separation onto the solid fertilizer fermented by the grafting strain groove type aerobic fermentation system, removing redundant water by utilizing fermentation heat, grafting nutrients into the solid fertilizer to obtain the solid organic fertilizer, or directly manufacturing the liquid organic fertilizer.

By adopting the implementation mode of the invention, the consumption of the biogas slurry in unit area is greatly increased, for example, generally 10 tons of the original biogas slurry can be applied to each mu of land, and about 50 tons of the original biogas slurry can be applied to each mu of land; and the livestock and poultry manure residue and the separated biogas residue which are separated from solid and liquid are used as padding materials in an heterotopic bed aerobic fermentation system, the nutrient-rich organic matter concentrated solution is combined to prepare a solid organic fertilizer, and the nutrients of the concentrated solution are grafted to the solid organic fertilizer, so that the high-quality solid organic fertilizer is obtained.

It should be noted that: in the working process of the livestock and poultry manure treatment provided by the embodiment, the working modes of the systems are only divided for illustration, and in practical application, the various embodiments can be reasonably combined or independently completed according to needs to complete all or part of the functions described above.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.