Composite carbon source for sewage treatment and preparation method thereof

Abstract

The invention discloses a composite carbon source for sewage treatment and a preparation method thereof in the technical field of sewage treatment, and the preparation method comprises the following steps: S1, drying a biomass raw material, S2, grinding and crushing, adding pure water, preparing a biomass slurry, S3, adding a bio-enzyme, S4, filtering and purifying, and evaporating and concentrating a filtered product, S5, sterilizing a concentrated solution, and thus obtaining the composite carbon source for sewage treatment. S6, sub-packaging the sterilized liquid, and sealing and storing; the composite carbon source is prepared by taking agricultural waste straws and agricultural products as biomass raw materials and is environment-friendly, the raw materials are easy to obtain, and the composite carbon source capable of being used for sewage treatment can be obtained through a simple preparation process, so that biomass such as the waste straws and the agricultural products is fully utilized, resource waste is avoided, and environmental protection is realized. Meanwhile, the influence of wastes on the environment is reduced; biomass is subjected to enzymolysis treatment through biological enzyme and decomposed into substances easy to absorb, and follow-up use is facilitated.

Description

Technical Field

[0001] The invention relates to the technical field of sewage treatment, in particular to a composite carbon source for sewage treatment and a preparation method thereof. Background Art

[0002] When treating sewage, physical, chemical and biological methods can be used to treat sewage, purify it, reduce pollution, and even recycle and reuse wastewater to make full use of water resources.

[0003] Composite carbon sources are used in sewage treatment. The main components are a combination of glucose, starch and other substances. As a carbon source for biological denitrification and denitrification of sewage, they are invested in sewage treatment to increase the speed and effect of sewage treatment.

[0004] Existing agricultural production will generate a lot of waste gas. Agricultural products and related materials, most of which contain a lot of carbon sources, are directly discarded or simply recycled and cannot be well utilized, resulting in waste of resources. Disposal will also produce organic wastewater and affect the environment.

[0005] Based on this, the present invention designs a composite carbon source for sewage treatment to solve the above problems. Summary of the invention

[0006] The purpose of the present invention is to provide a composite carbon source for sewage treatment to solve the problems raised in the above background technology.

[0007] To achieve the above object, the present invention provides the following technical solutions:

[0008] A method for preparing a composite carbon source for sewage treatment comprises the following steps:

[0009] S1. Pretreatment: collecting biomass raw materials, and washing and drying the biomass raw materials;

[0010] S2. preparing biomass slurry: crushing and grinding the dried biomass raw material, adding pure water and mixing, to obtain biomass slurry;

[0011] S3, adding biological enzymes: adding biological enzymes to the biomass slurry and stirring at a constant temperature;

[0012] S4, filtration and purification: filtering the product in S3, filtering and discharging the solid residue, and evaporating and concentrating the filtered liquid;

[0013] S5. Sterilization: sterilize the concentrated solution;

[0014] S6. Packaging and sealing: The processed liquid is transferred to the packaging equipment for packaging, and the liquid is sealed and stored in a sealed container for subsequent use.

[0015] Preferably, the biomass raw materials include straw, fruits and grains discarded in agricultural production.

[0016] Preferably, in step S2, after obtaining the biomass slurry, the pH value of the biomass slurry is tested, and a regulating solution is added to the biomass slurry according to the pH value to adjust the pH value of the biomass slurry to 6 to 7.5.

[0017] Preferably, the pH value of the biomass slurry is less than 6, and sodium hydroxide is used to adjust the solution.

[0018] Preferably, the pH value of the biomass slurry is greater than 7.5, and acetic acid or hydrochloric acid is used to adjust the solution.

[0019] Preferably, the biological enzyme in S3 is prepared by mixing cellulase, amylase and protease.

[0020] Preferably, cellulase, amylase and protease account for 45%, 35% and 20% of the total mass of the mixed bacteria, respectively.

[0021] Preferably, the sterilization method in S5 is sterilization by ultraviolet light irradiation.

[0022] A composite carbon source for sewage treatment is obtained by adopting the above preparation method.

[0023] Compared with the prior art, the present invention has the following beneficial effects:

[0024] 1. The composite carbon source of the present invention is prepared from agricultural waste gas straw and agricultural products as biomass raw materials, which is environmentally friendly, the raw materials are easy to obtain, and has broad prospects for large-scale application;

[0025] 2. The composite carbon source of the present invention can be used for sewage treatment through a simple preparation process, thereby achieving full utilization of biomass such as waste straw and agricultural products, avoiding waste of resources, and reducing the impact of waste on the environment.

[0026] 3. The present invention adds biological enzymes during the preparation process to perform enzymatic hydrolysis on biomass slurry, etc., so as to decompose starch, sugars and other substances contained in biomass such as waste agricultural products into easily absorbable substances for subsequent use. When used, it can promote the denitrification process, accelerate the sewage treatment speed, and improve the sewage treatment effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for describing the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative work.

[0028] Figure 1 It is a schematic diagram of the preparation process of the present invention. DETAILED DESCRIPTION

[0029] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0030] Embodiment 1

[0031] Please refer to the accompanying drawings, the present invention provides a technical solution:

[0032] A method for preparing a composite carbon source for sewage treatment comprises the following steps:

[0033] S1. Pretreatment: Collect biomass raw materials, and wash and dry them. Biomass raw materials include straw, fruits and grains discarded in agricultural production. Larger biomass raw materials, such as straw, can be cut into sections in advance.

[0034] When the weight of the biomass raw material no longer changes during drying, the drying process can be stopped.

[0035] S2. Prepare biomass slurry: crush and grind the dried biomass raw material, add pure water and mix well to obtain biomass slurry, wherein the grinding process can be stopped when the particle size of the biomass raw material reaches a powder of 1 to 2 mm.

[0036] S3. Adding biological enzymes: adding biological enzymes to the biomass slurry and stirring at a constant temperature, wherein the stirring temperature is 20-30° C., the stirring time is 25-35 min, and the stirring speed is 50-70 rpm.

[0037] S4, filtration and purification: filtering the product in S3, filtering out the solid residue, and evaporating and concentrating the filtered liquid to obtain a concentrated liquid. During the evaporation process, the high-temperature steam can also sterilize to a certain extent;

[0038] Among them, the filtration treatment adopts a combination of centrifugal filtration and bag filtration to improve the filtration effect, and the filtered solid residue is recycled to improve material utilization and reduce waste.

[0039] S5. Sterilization: The concentrated liquid is sterilized, wherein the sterilization method is sterilization by ultraviolet light irradiation, and combined with the steam sterilization in S4 to improve the sterilization effect.

[0040] S6. Packaging and sealing: The processed liquid is transferred to the packaging equipment for packaging, and the liquid is sealed and stored in a sealed container for subsequent use.

[0041] The composite carbon source of the present invention is prepared from agricultural waste gas straw and agricultural products as biomass raw materials, which is environmentally friendly, the raw materials are easy to obtain, and has broad prospects for large-scale application;

[0042] The composite carbon source of the present invention can be used for sewage treatment through a simple preparation process, thereby achieving full utilization of biomass such as waste straw and agricultural products, avoiding waste of resources, and reducing the impact of waste on the environment.

[0043] The present invention adds biological enzymes during the preparation process to perform enzymatic hydrolysis on biomass slurry, etc., so as to decompose starch, sugars and other substances contained in biomass such as waste agricultural products into easily absorbable substances for subsequent use. When used, it can promote the denitrification process, accelerate the sewage treatment speed, and improve the sewage treatment effect.

[0044] Embodiment 2

[0045] The structure of this embodiment is basically the same as that of the first embodiment, except that in step S2, after obtaining the biomass slurry, the pH value of the biomass slurry is tested, and a regulating solution is added to the biomass slurry according to the pH value to adjust the pH value of the biomass slurry to 6-7.5.

[0046] The pH value of the biomass slurry is less than 6, and sodium hydroxide is used to adjust the solution.

[0047] The pH value of the biomass slurry is greater than 7.5, and acetic acid or hydrochloric acid is used to adjust the solution.

[0048] Embodiment 3

[0049] The structure of this embodiment is basically the same as that of the first embodiment, except that the biological enzyme in S3 is made by mixing cellulase, amylase and protease, wherein cellulase, amylase and protease account for 45%, 35% and 20% of the total mass of the mixed strains, respectively.

[0050] Cellulase is a complex enzyme system composed of multiple hydrolases. Cellulase is generally divided into three categories: C1 enzyme, Cx enzyme and β-glucosidase. C1 enzyme is the enzyme that first acts on cellulose and destroys the crystalline structure of cellulose chains. Cx enzyme is a cellulase that acts on cellulose activated by C1 enzyme and decomposes β-1,4-glycosidic bonds. β-glucosidase can decompose cellobiose, cellotriose and other low-molecular-weight cellodextrins into glucose.

[0051] Amylase can hydrolyze the α-1,4-glycosidic bonds in starch. The hydrolysis products are dextrin, oligosaccharides and monosaccharides. After the enzyme acts, the viscosity of gelatinized starch can be rapidly reduced, turning it into liquefied starch. When amylase uses amylose as a substrate, amylose is first rapidly degraded to produce oligosaccharides, and then the oligosaccharides are slowly hydrolyzed to form the final products of glucose and maltose. Therefore, it is mainly used to hydrolyze starch to make maltose, glucose and syrup.

[0052] Proteases are effective at breaking down proteins by breaking the peptide bonds that link amino acids into polypeptide chains.

[0053] In the description of this specification, the description with reference to the terms "one embodiment", "example", "specific example", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0054] The preferred embodiments of the present invention disclosed above are only used to help illustrate the present invention. The preferred embodiments do not describe all the details in detail, nor do they limit the invention to only specific implementation methods. Obviously, many modifications and changes can be made according to the content of this specification. This specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the present invention, so that those skilled in the art can understand and use the present invention well. The present invention is limited only by the claims and their full scope and equivalents.

Claims

1. A method for preparing a composite carbon source for sewage treatment, characterized in that: The following steps are involved: S1. Pretreatment: collecting biomass raw materials, and washing and drying the biomass raw materials; S2. preparing biomass slurry: crushing and grinding the dried biomass raw material, adding pure water and mixing, to obtain biomass slurry; S3, adding biological enzymes: adding biological enzymes to the biomass slurry and stirring at a constant temperature; S4, filtration and purification: filtering the product in S3, filtering and discharging the solid residue, and evaporating and concentrating the filtered liquid; S5. Sterilization: sterilize the concentrated solution; S6. Packaging and sealing: The processed liquid is transferred to the packaging equipment for packaging, and the liquid is sealed and stored in a sealed container for subsequent use.

2. The method for preparing a composite carbon source for sewage treatment according to claim 1, characterized in that: The biomass raw materials include straw, fruits and grains discarded in agricultural production.

3. The method for preparing a composite carbon source for sewage treatment according to claim 1, characterized in that: In step S2, after obtaining the biomass slurry, the pH value of the biomass slurry is tested, and a regulating solution is added to the biomass slurry according to the pH value to adjust the pH value of the biomass slurry to 6-7.

5.

4. The method for preparing a composite carbon source for sewage treatment according to claim 3, characterized in that: The pH value of the biomass slurry is less than 6, and sodium hydroxide is used as the adjusting solution.

5. The method for preparing a composite carbon source for sewage treatment according to claim 3, characterized in that: The pH value of the biomass slurry is greater than 7.5, and acetic acid or hydrochloric acid is used as the adjusting solution.

6. The method for preparing a composite carbon source for sewage treatment according to claim 1, characterized in that: The biological enzyme in S3 is prepared by mixing cellulase, amylase and protease.

7. The method for preparing a composite carbon source for sewage treatment according to claim 6, characterized in that: The cellulase, amylase and protease account for 45%, 35% and 20% of the total mass of the mixed bacteria respectively.

8. The method for preparing a composite carbon source for sewage treatment according to claim 1, characterized in that: The sterilization method in S5 is sterilization by ultraviolet light irradiation.

9. A composite carbon source for sewage treatment, characterized in that: The product is obtained by the preparation method described in any one of patent claims 1 to 8.

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