Method and system for preparing amino acid fertilizer by using industrial tail gas fermentation waste liquid
阅读说明：本技术 使用工业尾气发酵废液制备氨基酸肥料的方法及系统 (Method and system for preparing amino acid fertilizer by using industrial tail gas fermentation waste liquid ) 是由 莫志朋 王晓东 佟淑环 赵凌 王梦莎 于 2019-11-05 设计创作，主要内容包括：本发明公开了一种使用工业尾气发酵废液制备氨基酸肥料的方法及系统,所述方法包括：通过对工业尾气发酵废液进行浓缩处理,得到浓缩废液；对所述浓缩废液进行水解处理,得到氨基酸溶液；并对所述氨基酸溶液进行干燥,得到氨基酸肥料。本发明能够将工业尾气发酵废液转化为氨基酸肥料,保留了工业尾气发酵废液中的氮、磷和钾等微量元素,从而提高了工业尾气发酵废液的资源利用率,并且降低了污水处理负荷。(The invention discloses a method and a system for preparing an amino acid fertilizer by using industrial tail gas fermentation waste liquid, wherein the method comprises the following steps: concentrating industrial tail gas fermentation waste liquid to obtain concentrated waste liquid; carrying out hydrolysis treatment on the concentrated waste liquid to obtain an amino acid solution; and drying the amino acid solution to obtain the amino acid fertilizer. The method can convert the industrial tail gas fermentation waste liquid into the amino acid fertilizer, and retains nitrogen, phosphorus, potassium and other trace elements in the industrial tail gas fermentation waste liquid, thereby improving the resource utilization rate of the industrial tail gas fermentation waste liquid and reducing the sewage treatment load.)
1. A method for preparing an amino acid fertilizer by using industrial tail gas fermentation waste liquid is characterized by comprising the following steps:
concentrating industrial tail gas fermentation waste liquid to obtain concentrated waste liquid;
carrying out hydrolysis treatment on the concentrated waste liquid to obtain an amino acid solution;
and drying the amino acid solution to obtain the amino acid fertilizer.
2. The method of claim 1, wherein before the concentrating the industrial tail gas fermentation waste liquid to obtain the concentrated waste liquid, the method further comprises:
and fermenting the industrial tail gas by an ethanol preparation method by industrial tail gas fermentation to obtain industrial tail gas fermentation waste liquid.
3. The method according to claim 2, wherein the industrial tail gas fermentation waste liquid contains mycoprotein.
4. The method according to claim 1, wherein the concentrating treatment of the industrial tail gas fermentation waste liquid to obtain a concentrated waste liquid specifically comprises:
and carrying out single-effect evaporation or multi-effect evaporation on the industrial tail gas fermentation waste liquid to obtain concentrated waste liquid.
5. The method according to claim 1, wherein the hydrolyzing the concentrated waste liquid to obtain the amino acid solution comprises:
and hydrolyzing the concentrated waste liquid by any one of an acidolysis method, an enzymolysis method and an acid enzyme combined hydrolysis method to obtain an amino acid solution.
6. The method according to claim 1, wherein the drying of the amino acid solution to obtain the amino acid fertilizer comprises:
and carrying out centrifugal spray drying or pressure spray drying on the amino acid solution to obtain the amino acid fertilizer.
7. A system for preparing an amino acid fertilizer by using industrial tail gas fermentation waste liquid, which is characterized by comprising:
the evaporation and concentration device is used for concentrating the industrial tail gas fermentation waste liquid to obtain concentrated waste liquid;
the hydrolysis device is used for carrying out hydrolysis treatment on the concentrated waste liquid to obtain an amino acid solution;
and the spray drying device is used for drying the amino acid solution to obtain the amino acid fertilizer.
8. The system of claim 7, wherein the system further comprises:
the first feeding pump is used for feeding the industrial tail gas fermentation waste liquid into the evaporation concentration device;
a second feed pump for feeding the concentrated spent liquor to the hydrolysis apparatus;
a third feed pump for feeding the amino acid solution into the spray-drying apparatus.
9. The system of claim 8, wherein the hydrolysis apparatus is more than one hydrolysis reactor.
10. The system of claim 8, wherein the system further comprises:
and the fermentation device is used for fermenting the industrial tail gas by an industrial tail gas fermentation ethanol preparation method to obtain industrial tail gas fermentation waste liquid.
Technical Field
The invention relates to a method and a system for preparing an amino acid fertilizer by using industrial tail gas fermentation waste liquid, belonging to the technical field of amino acid fertilizer preparation.
Background
We have invented a technology for producing ethanol by using industrial tail gas containing carbon monoxide as a raw material through a fermentation method (application No. CN201710352273.6, a method and a system for producing ethanol by using industrial tail gas through fermentation), the technology discloses that the ethanol is produced by using the industrial tail gas as the raw material through fermentation, compared with the traditional process for producing ethanol through grain fermentation, the technology has the advantages of no competition with people for grain and no competition with grain for land, the cost is far lower than that of the grain fermentation, and simultaneously, the carbon emission of enterprises generated in ferrous metallurgy and refining can be effectively reduced.
However, in the process of producing ethanol by using industrial tail gas fermentation, solid contents in mash after ethanol is extracted by distillation are only mycoprotein, and the application value is high, for example, direct discharge can cause resource waste on one hand and cause overlarge sewage treatment load on the other hand. Therefore, it is necessary to develop a new utilization method for reducing the load of sewage treatment while achieving high-value utilization.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a method and a system for preparing an amino acid fertilizer by using industrial tail gas fermentation waste liquid, so as to solve the technical problems of low resource utilization rate and overlarge sewage treatment load in the prior art.
In order to achieve the above object, an embodiment of the present invention provides a method for preparing an amino acid fertilizer using an industrial tail gas fermentation waste liquid, the method including the steps of:
concentrating industrial tail gas fermentation waste liquid to obtain concentrated waste liquid;
carrying out hydrolysis treatment on the concentrated waste liquid to obtain an amino acid solution;
and drying the amino acid solution to obtain the amino acid fertilizer.
Preferably, before the industrial tail gas fermentation waste liquid is concentrated to obtain a concentrated waste liquid, the method further comprises:
and fermenting the industrial tail gas by an ethanol preparation method by industrial tail gas fermentation to obtain industrial tail gas fermentation waste liquid.
Preferably, the industrial tail gas fermentation waste liquid contains mycoprotein.
Preferably, the concentration treatment is performed on the industrial tail gas fermentation waste liquid to obtain a concentrated waste liquid, and the method specifically comprises the following steps:
and carrying out single-effect evaporation or multi-effect evaporation on the industrial tail gas fermentation waste liquid to obtain concentrated waste liquid.
Preferably, the hydrolyzing the concentrated waste liquid to obtain an amino acid solution specifically includes:
and hydrolyzing the concentrated waste liquid by any one of an acidolysis method, an enzymolysis method and an acid enzyme combined hydrolysis method to obtain an amino acid solution.
Preferably, the amino acid solution is dried to obtain the amino acid fertilizer, which specifically comprises:
and carrying out centrifugal spray drying or pressure spray drying on the amino acid solution to obtain the amino acid fertilizer.
In addition, in order to achieve the above object, an embodiment of the present invention further provides a system for preparing an amino acid fertilizer by using an industrial tail gas fermentation waste liquid, where the system includes:
the evaporation and concentration device is used for concentrating the industrial tail gas fermentation waste liquid to obtain concentrated waste liquid;
the hydrolysis device is used for carrying out hydrolysis treatment on the concentrated waste liquid to obtain an amino acid solution;
and the spray drying device is used for drying the amino acid solution to obtain the amino acid fertilizer.
Preferably, the system further comprises:
the first feeding pump is used for feeding the industrial tail gas fermentation waste liquid into the evaporation concentration device;
a second feed pump for feeding the concentrated spent liquor to the hydrolysis apparatus;
a third feed pump for feeding the amino acid solution into the spray-drying apparatus.
Preferably, the hydrolysis apparatus is more than one hydrolysis reactor.
Preferably, the system further comprises:
and the fermentation device is used for fermenting the industrial tail gas by an industrial tail gas fermentation ethanol preparation method to obtain industrial tail gas fermentation waste liquid.
Compared with the prior art, the invention has the following advantages:
the method comprises the steps of concentrating industrial tail gas fermentation waste liquid to obtain concentrated waste liquid; carrying out hydrolysis treatment on the concentrated waste liquid to obtain an amino acid solution; and drying the amino acid solution to obtain the amino acid fertilizer. The industrial tail gas fermentation waste liquid can be converted into amino acid fertilizer, and trace elements such as nitrogen, phosphorus, potassium and the like in the industrial tail gas fermentation waste liquid are reserved, so that the resource utilization rate of the industrial tail gas fermentation waste liquid is improved, and the sewage treatment load is reduced.
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 schematic flow chart of a method for preparing an amino acid fertilizer by using industrial tail gas fermentation waste liquid according to the invention;
FIG. 2 is a schematic structural diagram of a system for preparing an amino acid fertilizer by using industrial tail gas fermentation waste liquid.
The reference numbers illustrate:
reference numerals
Name (R)
Reference numerals
Name (R)
1
First charge pump
4
2
5
3
Second feeding pump
6
Spray drying device
Detailed Description
The present invention will be described in detail below with reference to specific embodiments and examples, and the advantages and various effects of the present invention will be more clearly apparent therefrom. It will be understood by those skilled in the art that these specific embodiments and examples are for the purpose of illustrating the invention and are not to be construed as limiting the invention.
Throughout the specification, unless otherwise specifically noted, terms used herein should be understood as having meanings as commonly used in the art. Accordingly, unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. If there is a conflict, the present specification will control.
Unless otherwise specifically stated, various raw materials, reagents, instruments, equipment and the like used in the present invention are commercially available or can be prepared by existing methods.
Referring to fig. 1, an embodiment of the present invention provides a method for preparing an amino acid fertilizer by using an industrial tail gas fermentation waste liquid, which specifically includes the following steps:
step S10: concentrating industrial tail gas fermentation waste liquid to obtain concentrated waste liquid;
the industrial tail gas fermentation waste liquid contains mycoprotein with lower concentration, the difficulty of extracting the mycoprotein from the industrial tail gas fermentation waste liquid is higher, and in order to reduce the extraction difficulty and improve the extraction efficiency, the industrial tail gas fermentation waste liquid is evaporated and concentrated in advance to obtain concentrated waste liquid.
Further, the steam condensate water generated by the concentration treatment is directly reused for production.
Further, single-effect evaporation or multi-effect evaporation is carried out on the industrial tail gas fermentation waste liquid to obtain concentrated waste liquid.
The operation cost of the single-effect evaporation is higher than that of the multiple-effect evaporation, while the equipment cost of the single-effect evaporation is lower than that of the multiple-effect evaporation, in the specific implementation, the single-effect evaporation or the multiple-effect evaporation can be performed on the industrial tail gas fermentation waste liquid according to the actual production intensity and equipment quantity, for example, the single-effect evaporation is performed on the industrial tail gas fermentation waste liquid when the number of evaporation equipment is small, and the multiple-effect evaporation is performed on the industrial tail gas fermentation waste liquid when the number of evaporation equipment is large, so as to obtain the concentrated waste liquid.
Further, industrial tail gas is fermented by an ethanol preparation method by industrial tail gas fermentation to obtain industrial tail gas fermentation waste liquid.
The specific implementation process of the method for preparing the ethanol by fermenting the industrial tail gas comprises the following steps: pretreating industrial tail gas, wherein the pretreatment comprises the following steps: removing toxic substances in the industrial tail gas to obtain purified tail gas; the purified tail gas is used for fermentation to obtain fermented mash and residual gas; distilling the fermented mature mash to obtain ethanol and residual water containing bacteria; separating and concentrating the residual bacteria-containing distilled water to obtain a concentrated solution and a clear solution; purifying the clear liquid; and carrying out tail gas treatment on the residual gas to remove residual carbon monoxide. Wherein the concentrated solution is the industrial tail gas fermentation waste liquid.
Step S20: carrying out hydrolysis treatment on the concentrated waste liquid to obtain an amino acid solution;
the concentrated waste liquid contains mycoprotein with high concentration, the mycoprotein comprises insoluble protein and soluble protein, wherein the soluble protein is easy to dissolve in water, if the concentrated waste liquid is directly dried, a solid protein substance can be obtained from the insoluble protein in the concentrated waste liquid, and the soluble protein in the concentrated waste liquid is dried after being dissolved in water, so that a solid protein substance cannot be obtained, and resource waste is caused. Therefore, in order to improve the extraction rate of mycoprotein in the concentrated waste liquid, the concentrated waste liquid is subjected to hydrolysis treatment, and both insoluble protein and soluble protein in the concentrated waste liquid are hydrolyzed into soluble amino acid to obtain an amino acid solution, so that the waste of resources is avoided.
Further, the concentrated waste liquid is subjected to hydrolysis treatment by any one of an acid hydrolysis method, an enzymatic hydrolysis method and a combined acid enzyme hydrolysis method to obtain an amino acid solution.
The acidolysis method is a wet process for preparing inorganic products by decomposing mineral raw materials with acid, the enzymolysis method is a method for hydrolyzing specific substances by using active enzymes, and the enzyme-enzyme combined hydrolysis method is a method commonly used by the acidolysis method and the enzymolysis method. In a specific implementation, the hydrolysis is performed by a hydrolysis method suitable for the type of mycoprotein in the concentrated waste liquid, for example, the mycoprotein in the concentrated waste liquid can be catalyzed and decomposed by a certain active enzyme, and then the hydrolysis is performed by an enzymatic hydrolysis method or a combined enzymatic hydrolysis method, or if the mycoprotein in the concentrated waste liquid can be degraded by a certain acid, then the hydrolysis is performed by an acidic hydrolysis method or a combined enzymatic hydrolysis method.
Step S30: and drying the amino acid solution to obtain the amino acid fertilizer.
Almost all the protein in the industrial tail gas fermentation waste liquid is converted into the amino acid solution, at the moment, the amino acid solution is dried, the obtained amino acid fertilizer contains a large amount of trace elements required by various crops such as nitrogen, phosphorus, potassium and the like, and the amino acid fertilizer meets the index requirements of each standard of NY1429-2010 amino acid-containing water-soluble fertilizers.
Further, centrifugal spray drying or pressure spray drying is carried out on the amino acid solution to obtain the amino acid fertilizer.
The centrifugal spray drying is to utilize the disc rotating at high speed in horizontal direction to give centrifugal force to amino acid solution, so that it is thrown out at high speed to form film, filament or liquid drop, and owing to the action of friction, obstruction and tearing of air, the tangential acceleration produced with the rotation of the disc and the radial acceleration produced by centrifugal force can make the liquid move on the disc at a certain speed, and its track is a spiral, and after the liquid is thrown from the disc along the spiral line, the liquid can be dispersed into very small liquid drops, and can be moved along the tangential direction of the disc at an average speed, and at the same time the liquid drops can be fallen by means of geocentric suction force, and the flying distances of the sprayed particles are different, so that the particles fallen at different distances can be formed into a cylinder body symmetrical with centre of rotating shaft, i.e. amino acid fertilizer. The pressure spray drying is to use a high-pressure pump to polymerize the amino acid solution into 10-200 mist particles through an atomizer (spray gun) at 70-200 atm, and the mist particles are directly contacted with hot air for heat exchange, so as to finish drying in a short time. In actual operation, centrifugal spray drying or pressure spray drying can be selected according to specific operation equipment for drying.
In the embodiment, the industrial tail gas fermentation waste liquid is concentrated to obtain concentrated waste liquid; carrying out hydrolysis treatment on the concentrated waste liquid to obtain an amino acid solution; and drying the amino acid solution to obtain the amino acid fertilizer. The method realizes the conversion of the industrial tail gas fermentation waste liquid into the amino acid fertilizer, and retains the nitrogen, phosphorus, potassium and other trace elements in the industrial tail gas fermentation waste liquid, thereby improving the resource utilization rate of the industrial tail gas fermentation waste liquid and reducing the sewage treatment load.
Referring to fig. 2, an embodiment of the present invention provides a system for preparing an amino acid fertilizer using an industrial tail gas fermentation waste liquid, the system including:
the
the industrial tail gas fermentation waste liquid contains mycoprotein with lower concentration, the difficulty of extracting the mycoprotein from the industrial tail gas fermentation waste liquid is higher, and in order to reduce the extraction difficulty and improve the extraction efficiency, the industrial tail gas fermentation waste liquid is evaporated and concentrated in advance to obtain concentrated waste liquid.
Further, the steam condensate water generated at the top of the
The hydrolysis device 4 is used for carrying out hydrolysis treatment on the concentrated waste liquid to obtain an amino acid solution;
the concentrated waste liquid contains mycoprotein with high concentration, the mycoprotein comprises insoluble protein and soluble protein, wherein the soluble protein is easy to dissolve in water, if the concentrated waste liquid is directly dried, a solid protein substance can be obtained from the insoluble protein in the concentrated waste liquid, and the soluble protein in the concentrated waste liquid is dried after being dissolved in water, so that a solid protein substance cannot be obtained, and resource waste is caused. Therefore, in order to improve the extraction rate of mycoprotein in the concentrated waste liquid, the concentrated waste liquid is subjected to hydrolysis treatment, and both insoluble protein and soluble protein in the concentrated waste liquid are hydrolyzed into soluble amino acid to obtain an amino acid solution, so that the waste of resources is avoided.
Further, the hydrolysis device 4 is more than one hydrolysis reactor.
And the spray drying device 6 is used for drying the amino acid solution to obtain the amino acid fertilizer.
Almost all the protein in the industrial tail gas fermentation waste liquid is converted into the amino acid solution, at the moment, the amino acid solution is dried, the obtained amino acid fertilizer contains a large amount of trace elements required by various crops such as nitrogen, phosphorus and potassium, the amino acid fertilizer meets the index requirements of each standard of NY1429-2010 amino acid-containing water-soluble fertilizers, and the amino acid fertilizer is removed from the bottom of the spray drying device 6.
Further, the system further comprises: and the fermentation device is used for fermenting the industrial tail gas by an industrial tail gas fermentation ethanol preparation method to obtain industrial tail gas fermentation waste liquid.
The specific implementation process of the method for preparing the ethanol by fermenting the industrial tail gas comprises the following steps: pretreating industrial tail gas, wherein the pretreatment comprises the following steps: removing toxic substances in the industrial tail gas to obtain purified tail gas; the purified tail gas is used for fermentation to obtain fermented mash and residual gas; distilling the fermented mature mash to obtain ethanol and residual water containing bacteria; separating and concentrating the residual bacteria-containing distilled water to obtain a concentrated solution and a clear solution; purifying the clear liquid; and carrying out tail gas treatment on the residual gas to remove residual carbon monoxide. Wherein the concentrated solution is the industrial tail gas fermentation waste liquid.
Further, the system further comprises:
the first feeding pump 1 is used for feeding the industrial tail gas fermentation waste liquid into the
a
a
In the embodiment, the industrial tail gas fermentation waste liquid is concentrated by the
In order to clearly understand the objects, technical solutions and advantages of the present invention, the present invention will be further described in detail with reference to the following embodiments. The specific examples described herein relate to specific data only to illustrate the present invention and are not intended to limit the invention.