Production device for preparing biogas from vinasse percolate / vinasse water

Abstract

The utility model provides a production device for preparing biogas from vinasse percolate / vinasse water, and relates to the technical field of vinasse production. The production device comprises a pretreater, a regulating reservoir and an anaerobic reactor which are sequentially connected, the regulating reservoir is connected with an alkali liquor tank and a high-carbon wastewater tank, and the anaerobic reactor is connected with a gas treatment unit and a liquid treatment unit. The gas treatment unit comprises an adsorption tower, a condenser and a biogas storage tank which are connected in sequence, the liquid treatment unit comprises a biochemical pool and a dehydrator which are connected with each other, and the dehydrator is connected with the anaerobic reactor through a biogas slurry backflow pipeline 1. According to the production device, the carbon-nitrogen ratio of vinasse percolate / vinasse water is adjusted through the high-carbon wastewater tank, the microbial metabolism efficiency is improved, the biogas yield is increased, meanwhile, consumption of volatile fatty acid (VFA) by methanogens is promoted, and acidification is avoided.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of distiller's grains, and particularly relates to a production device for preparing biogas from distiller's grains leachate and distiller's grains water. BACKGROUND

[0002] A large amount of distiller's grains is produced in the field of liquor making, and the main treatment method for the distiller's grains is to separate the solid and liquid, and then treat the solid and liquid respectively, wherein the liquid mainly includes distiller's grains leachate and distiller's grains water. If the distiller's grains leachate and distiller's grains water are directly discharged, environmental pollution will inevitably be caused, and the distiller's grains leachate and distiller's grains water need to be collected and treated before being discharged. The anaerobic fermentation of distiller's grains wastewater to produce biogas is an important measure to reduce water pollution caused by distiller's grains and realize the recycling of distiller's grains.

[0003] However, since the raw materials for liquor making contain a large amount of protein and amino acids, the carbon source such as starch is preferentially converted into alcohol and carbon dioxide during the liquor making process, which leads to a significant decrease in the carbon content in the wastewater, and the nitrogen is not completely decomposed and enriched, so that the carbon-nitrogen ratio in the distiller's grains wastewater is imbalanced. When the carbon-nitrogen ratio is imbalanced, excessive ammonia nitrogen can penetrate the cell membrane, inhibit the enzyme activity of methanogens, and cause the biogas yield to decrease. In addition, high-nitrogen wastewater is prone to acidification, which further inhibits methanogens and affects the preparation of biogas. CONTENT

[0004] The utility model aims at providing a production device for preparing biogas from distiller's grains leachate and distiller's grains water, which adjusts the carbon-nitrogen ratio of the distiller's grains leachate and distiller's grains water through a high-carbon wastewater tank, improves the metabolic efficiency of microorganisms, increases the biogas yield, promotes the consumption of volatile fatty acids (VFA) by methanogens, and avoids acidification.

[0005] The utility model realizes the following technical scheme:

[0006] A production device for preparing biogas from distiller's grains leachate and distiller's grains water, comprising a pretreater, an adjusting tank and an anaerobic reactor connected in sequence, wherein the adjusting tank is connected with a lye tank and a high-carbon wastewater tank, the anaerobic reactor is connected with a gas treatment unit and a liquid treatment unit, the gas treatment unit comprises an adsorption tower, a condenser and a biogas storage tank connected in sequence, the liquid treatment unit comprises a biochemical tank and a dehydrator connected in sequence, and the dehydrator is connected with the anaerobic reactor through a biogas slurry reflux pipeline.

[0007] Further, the pretreater is provided with a first filter screen and a second filter screen, the first filter screen and the second filter screen are obliquely arranged, and the oblique directions of the first filter screen and the second filter screen are opposite.

[0008] Further, the high-carbon wastewater tank is provided with a straw leachate.

[0009] Further, a pH probe is arranged in the adjusting tank.

[0010] Further, a polyurethane heat preservation layer is arranged outside the anaerobic reactor, a heating coil is arranged in the anaerobic reactor, and a temperature detector is arranged on the anaerobic reactor.

[0011] Further, a stirring structure is arranged in the adjusting tank and the anaerobic reactor, and an epoxy resin layer is arranged on the surface of the stirring structure.

[0012] Further, an activated carbon adsorption layer and a molecular sieve adsorption layer are arranged in the adsorption tower, and the activated carbon adsorption layer and the molecular sieve adsorption layer are arranged alternately.

[0013] Further, the biochemical tank comprises an anoxic tank, an aerobic tank and an MBR membrane tank arranged in sequence, and the MBR membrane tank is connected with the anoxic tank through a biogas slurry reflux pipeline.

[0014] The technical scheme of the utility model has at least the following advantages and beneficial effects:

[0015] The preprocessor is used for reducing the content of suspended solids in the leachate / wine lees water, thereby reducing the load of the subsequent anaerobic reactor. The alkali tank is used for adjusting the pH value of the wastewater, thereby avoiding strong acid corrosion of the equipment and inhibiting the activity of microorganisms. The high-carbon wastewater tank is used for balancing the carbon-nitrogen ratio of the wastewater, thereby improving the metabolic efficiency of microorganisms, increasing the biogas production, promoting the consumption of volatile fatty acids (VFA) by methanogens, and avoiding acidification. The mixture of high-carbon wastewater and wine lees wastewater can reduce the ammonia nitrogen concentration, reduce the toxicity to methanogens, make the organic matter concentration of the wine lees wastewater more uniform, avoid high load impact caused by single raw material, promote the synergistic effect of functional flora due to the diversity of carbon sources, and reduce the risk of flora imbalance. The adsorption tower and the condenser can remove hydrogen sulfide and water in the biogas, thereby improving the purity of the biogas. The biochemical tank can reduce the COD and ammonia nitrogen concentration of the biogas slurry, thereby facilitating the recycling of the biogas slurry. BRIEF DESCRIPTION OF DRAWINGS

[0016] In order to more clearly illustrate the technical scheme of the embodiments of the utility model, the following will briefly introduce the drawings needed to be used in the embodiments, and it should be understood that the following drawings only show some embodiments of the utility model, and therefore should not be regarded as a limitation to the scope. For those skilled in the art, other related drawings can also be obtained without creative labor on the basis of these drawings.

[0017] Figure 1 The structure schematic view of the production device for preparing biogas from leachate / wine lees water provided by the embodiment 1 of the utility model is shown in the figure.

[0018] Figure 2This is a schematic diagram of the internal structure of the preprocessor provided in Embodiment 1 of this utility model;

[0019] Figure 3 A cross-sectional view of the anaerobic reactor provided in Embodiment 1 of this utility model;

[0020] Figure 4 This is a schematic diagram of the internal structure of the adsorption tower provided in Embodiment 1 of this utility model.

[0021] Icons: 1-Preprocessor, 2-Equalization tank, 3-Anaerobic reactor, 4-Alkali tank, 5-High carbon wastewater tank, 6-Adsorption tower, 7-Condenser, 8-Biogas storage tank, 9-Biochemical tank, 10-Dehydrator, 11-pH probe, 12-Temperature detector, 13-Biogas slurry return pipe 1, 14-First filter screen, 15-Second filter screen, 16-Polyurethane insulation layer, 17-Heating coil, 18-Stirring structure, 19-Activated carbon adsorption layer, 20-Molecular sieve adsorption layer. Detailed Implementation

[0022] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0023] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0024] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0025] In the description of this utility model, it should be noted that if terms such as "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" appear to indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product is in use, they are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0026] In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0027] Example 1

[0028] like Figures 1-4 As shown, this embodiment provides a biogas production device for preparing biogas from distillers' grains leachate / distillers' grains water, including a pre-processor 1, an equalization tank 2, and an anaerobic reactor 3 connected in sequence. The equalization tank 1 is connected to an alkali tank 4 and a high-carbon wastewater tank 5. The anaerobic reactor 3 is connected to a gas treatment unit and a liquid treatment unit. The gas treatment unit includes an adsorption tower 6, a condenser 7, and a biogas storage tank 8 connected in sequence. The liquid treatment unit includes a biochemical tank 9 and a dehydrator 10 connected in sequence. The dehydrator 10 is connected to the anaerobic reactor 3 through a biogas slurry return pipe 13.

[0029] Preprocessor 1 reduces the suspended solids content in the distillers' grains leachate / distillers' grains water, lowering the load on the subsequent anaerobic reactor. Alkali tank 4 adjusts the wastewater pH to prevent strong acidity from corroding equipment and inhibiting microbial activity. High-carbon wastewater tank 5 balances the carbon-to-nitrogen ratio, improving microbial metabolic efficiency, increasing biogas production, and promoting the consumption of volatile fatty acids (VFAs) by methanogens, preventing acidification. Mixing high-carbon wastewater and distillers' grains wastewater reduces ammonia nitrogen concentration, lessening toxicity to methanogens, resulting in a more uniform organic matter concentration in the wastewater, avoiding high-load shocks caused by a single raw material, and promoting synergistic effects of functional microorganisms, reducing the risk of microbial imbalance. Adsorption tower 6 and condenser 7 remove hydrogen sulfide and moisture from the biogas, improving biogas purity. Biochemical tank 9 reduces COD and ammonia nitrogen concentrations in the biogas slurry, facilitating its recycling. The alkali in alkali tank 4 is lime or sodium hydroxide.

[0030] In this embodiment, the preprocessor 1 is provided with a first filter screen 14 and a second filter screen 15. The first filter screen 14 and the second filter screen 15 are inclined, and the inclination directions of the first filter screen 14 and the second filter screen 15 are opposite. The cooperation of the first filter screen 14 and the second filter screen 15 can improve the filtration effect of the distiller's grains wastewater, significantly reduce the suspended solids in the distiller's grains wastewater, and avoid clogging the system.

[0031] In this embodiment, straw leachate is placed inside the high-carbon wastewater tank 5. The carbon-to-nitrogen ratio of the wastewater is adjusted to 20:1-30:1 using the straw leachate. The alkaline components of the straw leachate (such as lignin degradation products) can partially neutralize the acidity of the distiller's grains wastewater, thereby reducing the amount of alkali added and lowering production costs. Simultaneously, the mixed utilization of straw leachate (agricultural waste) and distiller's grains wastewater (industrial wastewater) achieves "waste treatment with waste," synergistic resource utilization of industrial and agricultural waste, and combines economic and environmental benefits.

[0032] In this embodiment, a pH probe 11 is installed in the conditioning tank 2.

[0033] In this embodiment, the anaerobic reactor 3 is externally provided with a polyurethane insulation layer 16, and a heating coil 17 is arranged in the interlayer of the anaerobic reactor 3. A temperature detector 12 is installed on the anaerobic reactor 3. The polyurethane insulation layer 16 and the heating coil 17 can improve the temperature stability of the anaerobic reactor 3 and avoid temperature fluctuations from affecting the activity of anaerobic bacteria.

[0034] In this embodiment, both the equalization tank 2 and the anaerobic reactor 3 are equipped with stirring structures 18, and the surface of the stirring structures 18 is coated with an epoxy resin layer. The stirring structures 18 improve the mixing uniformity of the alkaline solution, straw leachate, and distiller's grains wastewater in the equalization tank 2, prevent material stratification in the anaerobic reactor 3, allow microorganisms to fully contact the distiller's grains wastewater, and increase gas production. The epoxy resin provides protection and extends the service life of the stirring structures 18.

[0035] In this embodiment, the adsorption tower 6 is provided with an activated carbon adsorption layer 19 and a molecular sieve adsorption layer 20, and the activated carbon adsorption layer 19 and the molecular sieve adsorption layer 20 are alternately arranged. Activated carbon can adsorb hydrogen sulfide and elemental sulfur in biogas, and molecular sieve can adsorb moisture in biogas, thereby purifying biogas.

[0036] In this embodiment, the biochemical tank 9 includes an anoxic tank, an aerobic tank, and an MBR membrane tank arranged sequentially, and the MBR membrane tank is connected to the anoxic tank via a biogas slurry return pipeline. Treatment through the anoxic tank, aerobic tank, and MBR membrane tank can reduce the COD and ammonia nitrogen in the biogas slurry, facilitating its return and reuse.

[0037] The working principle of a biogas production device for preparing biogas from distillers' grains leachate / distillers' grains water is as follows: Distillers' grains leachate / distillers' grains water is added to a pre-processor 1, and suspended solids are filtered using a first filter screen 14 and a second filter screen 15. After filtration, it is transported to an equalization tank 2. Straw leachate from a high-carbon wastewater tank 5 is added to the equalization tank 2 to balance the carbon-nitrogen ratio. Then, alkali solution from an alkali tank 4 is added to the equalization tank 2 to adjust the pH. After treatment, it is fed into an anaerobic reactor 3 for fermentation. The biogas discharged from the anaerobic reactor 3 is first dehydrated by an adsorption tower 6 to remove hydrogen sulfide, elemental sulfur, and water, and then dehydrated again by a condenser 7 before being stored in a biogas storage tank 8. The biogas slurry discharged from the anaerobic reactor 3 is treated by an anoxic tank, an aerobic tank, and an MBR membrane tank to reduce COD and ammonia nitrogen, and then treated by a dehydrator 10 to separate the biogas slurry and biogas residue.

[0038] The above are merely preferred embodiments of this utility model and are not intended to limit the scope of this utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A production device for producing biogas from distiller's grains leachate / distiller's grain water, characterized by: The device comprises a pretreater, a regulating tank and an anaerobic reactor connected in sequence, the regulating tank is connected with a lye tank and a high-carbon wastewater tank, the anaerobic reactor is connected with a gas treatment unit and a liquid treatment unit, the gas treatment unit comprises an adsorption tower, a condenser and a biogas storage tank connected in sequence, the liquid treatment unit comprises a biochemical tank and a dehydrator connected in sequence, and the dehydrator is connected with the anaerobic reactor through a biogas liquid return pipeline.

2. The apparatus for producing biogas from distillers' grains permeate / distillers' grains wet cake according to claim 1, wherein, The pretreater is provided with a first filter screen and a second filter screen, the first filter screen and the second filter screen are arranged obliquely, and the oblique directions of the first filter screen and the second filter screen are opposite.

3. The apparatus for producing biogas from distillers' grains permeate / distillers' grains wet cake according to claim 1, wherein, The high-carbon wastewater tank is provided with a straw leaching solution.

4. The apparatus for producing biogas from distillers' grains permeate / distillers' grains wet cake according to claim 1, wherein, The regulating tank is provided with a pH probe.

5. The apparatus for producing biogas from distillers' grains permeate / distillers' grains wet cake according to claim 1, wherein, The anaerobic reactor is externally provided with a polyurethane heat preservation layer, the anaerobic reactor is provided with a heating coil in a sandwiched manner, and the anaerobic reactor is provided with a temperature detector.

6. The apparatus for producing biogas from distillers' grains permeate / distillers' grains wet cake according to claim 1, wherein, The regulating tank and the anaerobic reactor are both provided with a stirring structure, and the surface of the stirring structure is provided with an epoxy resin layer.

7. The apparatus for producing biogas from distillers' grains permeate / distillers' grains wet cake according to claim 1, wherein, The adsorption tower is provided with an activated carbon adsorption layer and a molecular sieve adsorption layer, and the activated carbon adsorption layer and the molecular sieve adsorption layer are arranged alternately.

8. The apparatus for producing biogas from distillers' grains permeate / distillers' grains wet cake according to claim 1, wherein, The biochemical tank comprises an anoxic tank, an aerobic tank and an MBR membrane tank arranged in sequence, and the MBR membrane tank is connected with the anoxic tank through a biogas liquid return pipeline two.

Images