CN115286435A - Method for circularly concentrating biogas slurry - Google Patents
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- CN115286435A CN115286435A CN202210928864.4A CN202210928864A CN115286435A CN 115286435 A CN115286435 A CN 115286435A CN 202210928864 A CN202210928864 A CN 202210928864A CN 115286435 A CN115286435 A CN 115286435A
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Abstract
The invention belongs to the technical field of environmental protection, and particularly relates to a biogas slurry cyclic concentration method, which comprises the steps of separating biogas slurry and biogas residues through a solid-liquid separation system after carrying out anaerobic fermentation on organic biomass, carrying out deamination and cyclic fermentation concentration on the biogas slurry until the salt content reaches 1-3%, separating the biogas slurry, compounding the separated biogas slurry with auxiliary materials and an absorption liquid obtained after deamination of an ammonia absorption system to obtain a liquid fertilizer, recycling heat energy from gas generated by decomposition and evaporation of the biogas slurry by using anaerobic fermentation circulating water, discharging ammonia, carbon dioxide and other gases at normal pressure through a vacuum pump, and finally recycling ammonia gas in tail gas through an ammonia absorption system to realize recycling of ammonia resources and cyclic concentration of soluble nutrients in the biogas slurry. By adopting the biogas slurry circulating concentration method provided by the technical scheme of the invention, the consumption of anaerobic fermentation water resources is greatly reduced, heat energy and soluble nutrients in biogas slurry are recovered, and the nutritive value of biogas slurry is improved.
Description
Technical Field
The invention belongs to the technical field of environmental protection, and particularly relates to a biogas slurry circulating concentration method.
Background
Along with the rapid development of economy in China, the living standard of people is continuously improved, more and more organic biomasses are produced, such as vinasse, excrement, waste fruits and vegetables, straws, kitchens and the like, the most common treatment approaches of the organic biomasses are through anaerobic fermentation treatment, the produced biogas residues and biogas slurry enter organic agricultural production, and the recycling of resources is realized. However, as the biogas slurry has low nutrient concentration, low value of unit volume and high transportation cost, enterprises can utilize the biogas slurry to enter organic agricultural production, and the resource utilization is usually a loss, so that the utilization of the biogas slurry becomes a difficult point of organic biomass anaerobic fermentation. Therefore, a technology for improving the biogas slurry value is urgently needed to be developed so as to better realize the resource utilization of the biogas slurry.
Disclosure of Invention
The invention aims to provide a method for concentrating biogas slurry to improve the nutrient concentration of the biogas slurry and further reduce the transportation cost.
In order to achieve the aim, the invention provides a method for circularly concentrating biogas slurry, which comprises the following specific steps:
(1) Feeding anaerobic fermentation raw materials into an anaerobic fermentation system for fermentation, and purifying the obtained biogas for utilization;
(2) Carrying out solid-liquid separation on the biogas slurry and the biogas residues fermented by the anaerobic fermentation system through a solid-liquid separation system to separate out biogas slurry;
(3) The biogas slurry obtained by solid-liquid separation enters a biogas slurry deamination system for deamination, so that the biogas slurry is decomposed under negative pressure and evaporated to remove gas in the biogas slurry, and the gas enters an ammonia absorption system for deamination at normal pressure after being cooled by a heat exchanger;
(4) Refluxing the deaminated biogas slurry to an anaerobic fermentation system, compounding the deaminated biogas slurry with anaerobic fermentation raw materials, then allowing the deaminated biogas slurry to enter the anaerobic fermentation system for continuous anaerobic fermentation, and repeating the steps (1) to (4) until the biogas slurry is circularly concentrated until the salt content reaches 1-3%;
(5) And performing solid-liquid separation, and enabling the separated biogas slurry to enter a biogas slurry concentrated solution compound system, and compound the biogas slurry with the absorption solution after deamination in the ammonia absorption system and auxiliary materials to form the liquid fertilizer.
The principle and the advantages of the technical scheme of the invention are as follows: after the organic biomass is subjected to anaerobic fermentation, the biogas slurry and biogas residues are separated by a solid-liquid separation system, the biogas slurry is subjected to deamination and circulation, the decomposed and evaporated gas is subjected to heat energy recovery by anaerobic fermentation circulating water, ammonia, carbon dioxide and other gases are discharged at normal pressure by an oil-free lubricating vacuum pump, and finally ammonia gas in tail gas is recovered by an ammonia absorption system, so that the recycling of ammonia resources and the cyclic concentration of soluble nutrients (except ammonia nitrogen) in the biogas slurry are realized. Through the cyclic concentration of the biogas slurry, the consumption of water resources of an anaerobic fermentation tank is greatly reduced, heat energy and soluble nutrients in the biogas slurry are recovered, the cyclic concentration of the soluble nutrients (except ammonia nitrogen) in the biogas slurry is realized, the ammonia resources are recovered, the value of the compounded liquid fertilizer is greatly improved, and the method is a green and environment-friendly technology.
Further, the anaerobic fermentation raw material in the step (1) is organic biomass raw material such as kitchen waste, straw, livestock and poultry manure, mushroom dregs, food industry waste, agriculture and forestry waste and the like.
Further, in the step (3), the biogas slurry deamination system is tower deamination or spray deamination or falling film deamination or film deamination.
Further, the Total Suspended Solids (TSS) of the biogas slurry after the separation of the biogas slurry and the biogas residues in the step (2) are processed to meet the requirements of a biogas slurry deamination system, and the total suspended solids are 10-800 mg/L.
Further, ammonia nitrogen in the biogas slurry subjected to negative pressure deamination treatment by the biogas slurry deamination system in the step (3) is between 100 and 800mg/L, preferably 200mg/L.
Further, the absorbent of the ammonia absorption system in step (3) is one or more aqueous solutions of inorganic acids such as sulfuric acid, hydrochloric acid, phosphoric acid, nitric acid, and the like, or organic acids such as citric acid, and the pH of the absorption solution is controlled to be less than 3, so that the concentration of the formed ammonium salt can reach the ammonium salt saturation concentration, preferably 20%.
Furthermore, the auxiliary materials in the step (5) are materials required by liquid fertilizer products, including nitrogenous fertilizer, phosphate fertilizer, potash fertilizer, amino acid, medium and micro fertilizer required by plants, beneficial bacteria and the like.
Further, the operation pressure of the ammonia absorption system in the step (3) is-0.06 MPa to-0.1 MPa, the heating temperature of the biogas slurry is 60 ℃ to 100 ℃, the biogas slurry entering the biogas slurry deamination system does not need to be adjusted by adding alkali, and the pH of the deaminated biogas slurry is 9 to 10.
Further, cooling the gas separated from the biogas slurry in the step (3) by using circulating water of an anaerobic fermentation system to recover heat energy, treating condensed water in a sewage treatment system, removing ammonia in an ammonia absorption system at normal pressure by using an oil-free lubricating vacuum pump after cooling, and treating waste gas after ammonia removal in a tail gas treatment system.
Further, the tower is deaminated into a packed tower or a plate tower, the packed tower adopts anti-blocking packing, and the packing adopts ceramic, glass, acid-resistant stainless steel or silicon carbide material; the plate tower adopts an anti-blocking tower plate.
Furthermore, the spray deamination is to use an atomizing nozzle to spray in the cavity to remove ammonia, carbon dioxide, a small amount of vapor and other gases in the biogas slurry, wherein the nozzle is an anti-blocking atomizing nozzle.
Further, the falling film type deamination is deamination by using a falling film tube type evaporator.
Further, the membrane deamination is performed by using high-temperature resistant deamination.
Drawings
FIG. 1 is a schematic process flow diagram according to an embodiment of the present invention.
Detailed Description
The following is further detailed by way of specific embodiments:
example 1:
as shown in fig. 1, this embodiment provides a method for circularly concentrating biogas slurry, which includes the following steps:
(1) Anaerobic fermentation raw materials are fed into an anaerobic fermentation system for fermentation, the anaerobic fermentation raw materials are kitchen waste, the anaerobic fermentation system adopts a common anaerobic fermentation tank, and generated biogas is purified and then utilized;
(2) Carrying out solid-liquid separation on biogas slurry and biogas residues fermented by the anaerobic fermentation system through a solid-liquid separation system, enabling the separated biogas residues to enter the existing biogas residue utilization system for utilization, wherein the solid-liquid separation system adopts a common centrifugal or plate-and-frame separation device, such as a plate filter press;
(3) The biogas slurry after solid-liquid separation enters a biogas slurry deamination system for deamination, under the action of an oil-free lubrication vacuum pump, the biogas slurry is decomposed and evaporated under negative pressure to remove ammonia, carbon dioxide, a small amount of water vapor and other gases in the biogas slurry, the separated gases pass through a heat exchanger, an anaerobic fermentation system is used for cooling circulating water to recover heat energy, condensed water enters a sewage treatment system for treatment, the ammonia and carbon dioxide gases after cooling to remove water vapor enter an ammonia absorption system for deamination under normal pressure through the oil-free lubrication vacuum pump, and the waste gas after deamination enters a tail gas treatment system for treatment;
(4) The deaminated biogas slurry flows back to the anaerobic fermentation system and enters the anaerobic fermentation system for continuous anaerobic fermentation after being compounded with anaerobic fermentation raw materials;
(5) When the biogas slurry is circularly concentrated to affect anaerobic fermentation, the salt content is usually 1-3%, part of the biogas slurry after solid-liquid separation enters a biogas slurry concentrated solution compound system, and is compounded with an absorption solution and auxiliary materials after deamination of an ammonia absorption system to form a liquid fertilizer, and the compound system is prepared by mixing the liquid fertilizer in a common mixing tank.
In the step (3), the biogas slurry deamination system is a tower deamination system, preferably adopts a packed tower, the packed tower adopts anti-blocking packing, and the packing adopts ceramic materials; the total suspended matter (TSS) of the biogas slurry after the separation of the biogas slurry and the biogas residues meets the requirement of a biogas slurry deamination system after being treated, and the total suspended matter is 100 mg/L; ammonia nitrogen of the biogas slurry subjected to negative pressure deamination treatment by the biogas slurry deamination system is 200mg/L; the absorbent of the ammonia absorption system is sulfuric acid, the pH value of absorption liquid is controlled to be less than 3, and the concentration of the formed ammonium salt is 20%. The ammonia absorption system adopts an acid-resistant packed tower, the operation pressure is-0.06 MPa, the biogas slurry heating temperature is 90 ℃, the biogas slurry entering the biogas slurry deamination system does not need to be adjusted by adding alkali, and the pH of the deaminated biogas slurry is 9.5.
The auxiliary materials in the step (5) are nitrogen fertilizer, phosphate fertilizer and potassium fertilizer required by liquid fertilizer products.
Example 2
The process of the embodiment 2 is basically the same as that of the embodiment 1, the main difference lies in the selection of devices and process parameters, and the embodiment provides a biogas slurry circulating concentration method, which comprises the following steps:
(1) Anaerobic fermentation raw materials are fed into an anaerobic fermentation system for fermentation, the anaerobic fermentation raw materials are kitchen waste and food industrial waste, and the obtained biogas is purified and utilized;
(2) Performing solid-liquid separation on biogas slurry and biogas residues fermented by the anaerobic fermentation system through a solid-liquid separation system, wherein total suspended matters (TSS) of the biogas slurry after separation of the biogas slurry and the biogas residues meet the requirements of a biogas slurry deamination system after treatment, the total suspended matters are 300mg/L, and the biogas residues enter a biogas residue utilization system for utilization;
(3) The biogas slurry after solid-liquid separation enters a biogas slurry deamination system for deamination, under the action of an oil-free lubrication vacuum pump, the biogas slurry is decomposed and evaporated under negative pressure to remove ammonia, carbon dioxide, a small amount of water vapor and other gases in the biogas slurry, the separated gases are cooled by circulating water of an anaerobic fermentation system to recover heat energy, condensed water enters a sewage treatment system for treatment, the ammonia and carbon dioxide gases after cooling to remove water vapor enter an ammonia absorption system for deamination under normal pressure through the oil-free lubrication vacuum pump, and waste gas after deamination enters a tail gas treatment system for treatment;
(4) Refluxing the deaminated biogas slurry to an anaerobic fermentation system, compounding anaerobic fermentation raw materials, and then feeding the mixture into the anaerobic fermentation system for continuous anaerobic fermentation;
(5) When the biogas slurry is circularly concentrated to affect anaerobic fermentation, the salt content is usually 1-3%, the biogas slurry part after solid-liquid separation enters a biogas slurry concentrated solution compound system, and is compounded with an absorption solution and auxiliary materials after deamination of an ammonia absorption system to form a liquid fertilizer.
In the step (3), the biogas slurry deamination system is spray deamination, ammonia, carbon dioxide, a small amount of vapor and other gases in the biogas slurry are removed by spraying in the cavity by using an atomizing nozzle, and the nozzle is an anti-blocking atomizing nozzle.
The ammonia nitrogen of the biogas slurry after negative pressure deamination treatment in the biogas slurry deamination system is 200mg/L.
The absorbent of the ammonia absorption system is phosphoric acid, the pH value of absorption liquid is controlled to be less than 3, and the concentration of the formed ammonium salt is 15%.
The operation pressure of the ammonia absorption system is-0.08 MPa, the biogas slurry heating temperature is 70 ℃, the biogas slurry entering the biogas slurry deamination system does not need to be adjusted by adding alkali, and the pH of the deaminated biogas slurry is 9.6.
In the step (5), the auxiliary materials are nitrogen fertilizer, phosphate fertilizer, potassium fertilizer and amino acid required by liquid fertilizer products.
Example 3
The embodiment provides a method for circularly concentrating biogas slurry, which comprises the following steps:
(1) Feeding anaerobic fermentation raw materials into an anaerobic fermentation system for fermentation, and purifying and utilizing methane;
(2) Carrying out solid-liquid separation on biogas slurry and biogas residues fermented by the anaerobic fermentation system through a solid-liquid separation system, and enabling the biogas residues to enter a biogas residue utilization system for utilization;
(3) The biogas slurry after solid-liquid separation enters a biogas slurry deamination system for deamination, under the action of an oil-free lubrication vacuum pump, the biogas slurry is decomposed and evaporated under negative pressure to remove ammonia, carbon dioxide, a small amount of water vapor and other gases in the biogas slurry, the separated gases are cooled by circulating water of an anaerobic fermentation system to recover heat energy, condensed water enters a sewage treatment system for treatment, the ammonia and carbon dioxide gases after cooling to remove water vapor enter an ammonia absorption system for deamination under normal pressure through the oil-free lubrication vacuum pump, and waste gas after deamination enters a tail gas treatment system for treatment;
(4) The deaminated biogas slurry flows back to the anaerobic fermentation system and enters the anaerobic fermentation system for continuous anaerobic fermentation after being compounded with anaerobic fermentation raw materials;
(5) When biogas slurry is circularly concentrated to influence anaerobic fermentation, part of biogas slurry after solid-liquid separation enters a biogas slurry concentrated solution compound system, and is compounded with absorption liquid and auxiliary materials after deamination of an ammonia absorption system to form the liquid fertilizer.
The anaerobic fermentation raw materials in the step (1) are kitchen waste and livestock and poultry manure.
And (3) treating the total suspended matters (TSS) of the biogas slurry separated from the biogas slurry and the biogas residues in the step (2) to meet the requirements of a biogas slurry deamination system, wherein the total suspended matters are 200mg/L.
In the step (3), the biogas slurry deamination system is a falling film type deamination, and the falling film type deamination is deamination by using a falling film tube type evaporator.
And (4) performing negative pressure deamination treatment on the ammonia nitrogen in the biogas slurry deamination system in the step (3) to obtain 300mg/L ammonia nitrogen in the biogas slurry.
And (4) the absorbent of the ammonia absorption system in the step (3) is sulfuric acid, the pH value of the absorption liquid is controlled to be less than 3, and the concentration of the formed ammonium salt is 20%.
The operation pressure of the ammonia absorption system in the step (3) is-0.09 MPa, the heating temperature of the biogas slurry is 60 ℃, the biogas slurry entering the biogas slurry deamination system does not need to be adjusted by adding alkali, and the pH of the deaminated biogas slurry is 9.5.
The auxiliary materials in the step (5) are materials required by liquid fertilizer products, and comprise nitrogenous fertilizer, phosphate fertilizer, potash fertilizer and beneficial bacteria.
The foregoing is merely an example of the present invention and common general knowledge in the art of designing and/or characterizing particular aspects and/or features is not described in any greater detail herein. It should be noted that, for those skilled in the art, variations and modifications such as simple change of the type and pH of the absorbent, simple change of the type of auxiliary materials, etc. can be made without departing from the technical solution of the present invention, and in the present invention, unless otherwise specifically defined and limited, the specific meaning of the above terms in the present invention can be understood by those skilled in the art according to specific circumstances. The scope of the claims of the present application shall be determined by the contents of the claims, and the description of the embodiments and the like in the specification shall be used to explain the contents of the claims.
Claims (10)
1. A method for circularly concentrating biogas slurry is characterized by comprising the following steps:
(1) Feeding anaerobic fermentation raw materials into an anaerobic fermentation system for fermentation;
(2) Carrying out solid-liquid separation on the fermented biogas slurry and residue;
(3) The biogas slurry obtained by solid-liquid separation enters a biogas slurry deamination system for deamination, so that the biogas slurry is decomposed under negative pressure and evaporated to remove gas in the biogas slurry, and the gas enters an ammonia absorption system for deamination at normal pressure after being cooled by a heat exchanger;
(4) Refluxing the deaminated biogas slurry to an anaerobic fermentation system, compounding the deaminated biogas slurry with anaerobic fermentation raw materials, then allowing the deaminated biogas slurry to enter the anaerobic fermentation system for continuous anaerobic fermentation, and repeating the steps (1) to (4) until the biogas slurry is circularly concentrated until the salt content reaches 1-3%;
(5) And performing solid-liquid separation, and enabling the separated biogas slurry to enter a biogas slurry concentrated solution compound system, and compound the biogas slurry with the absorption solution after deamination in the ammonia absorption system and auxiliary materials to form the liquid fertilizer.
2. The method for circularly concentrating biogas slurry as claimed in claim 1, wherein the method comprises the following steps: the anaerobic fermentation raw materials in the step (1) are kitchen waste, straws, livestock and poultry manure, mushroom dregs, food industry waste and/or agriculture and forestry waste.
3. The method for circularly concentrating biogas slurry as claimed in claim 1, wherein the method comprises the following steps: the total suspended matters of the biogas slurry after the separation of the biogas slurry and the biogas residues in the step (2) are 10-800 mg/L.
4. The method for circularly concentrating biogas slurry as claimed in claim 1, wherein the method comprises the following steps: and in the step (3), the biogas slurry deamination system is tower deamination, spray deamination, falling film deamination or film deamination.
5. The method for circularly concentrating biogas slurry as claimed in claim 1, wherein the method comprises the following steps: and (3) ammonia nitrogen in the biogas slurry after deamination in the biogas slurry deamination system in the step (3) is 100-800 mg/L.
6. The method for circularly concentrating biogas slurry as claimed in claim 1, wherein the method comprises the following steps: the absorbent of the ammonia absorption system in the step (3) is sulfuric acid, hydrochloric acid, phosphoric acid, nitric acid and/or citric acid aqueous solution, and the pH value of the absorption liquid is controlled to be less than 3.
7. The method for circularly concentrating biogas slurry as claimed in claim 1, wherein the method comprises the following steps: the auxiliary materials in the step (5) comprise at least one of nitrogenous fertilizer, phosphate fertilizer, potash fertilizer, amino acid, medium and micro fertilizer required by plants and beneficial bacteria.
8. The method for circularly concentrating biogas slurry as claimed in claim 1, wherein the method comprises the following steps: the operation pressure of the ammonia absorption system in the step (3) is-0.06 MPa to-0.1 MPa, the heating temperature of the biogas slurry is 60 ℃ to 100 ℃, and the pH of the deaminated biogas slurry is 9 to 10.
9. The method for circularly concentrating biogas slurry as claimed in claim 1, wherein the method comprises the following steps: and (3) cooling the gas separated from the biogas slurry in the step (3) by using circulating water of an anaerobic fermentation system to recover heat energy, treating condensed water in a sewage treatment system, removing ammonia in an ammonia absorption system at normal pressure by using an oil-free lubricating vacuum pump after cooling, and treating the waste gas after ammonia removal in a tail gas treatment system.
10. The method for circularly concentrating biogas slurry according to claim 3, characterized in that: the tower is deaminated into a packed tower or a plate tower; the spray deamination is to remove ammonia, carbon dioxide and a small amount of water vapor in the biogas slurry by spraying in a cavity by using an atomizing nozzle, wherein the nozzle is an anti-blocking atomizing nozzle; the falling film type deamination is to deaminate by using a falling film tube type evaporator; the membrane deamination is carried out by using a high-temperature resistant deamination membrane.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2024114831A1 (en) * | 2022-12-01 | 2024-06-06 | 上海倍奇新能源科技有限公司 | Anaerobic fermentation system and method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2024114831A1 (en) * | 2022-12-01 | 2024-06-06 | 上海倍奇新能源科技有限公司 | Anaerobic fermentation system and method |
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