CN112441664A

CN112441664A - Composite carbon source sewage treatment agent and preparation method thereof

Info

Publication number: CN112441664A
Application number: CN202011229095.6A
Authority: CN
Inventors: 周兴东; 饶丹; 叶涛
Original assignee: Guangzhou Xiaozhong Environmental Protection Technology Co ltd
Current assignee: Guangzhou Xiaozhong Environmental Protection Technology Co ltd
Priority date: 2020-11-06
Filing date: 2020-11-06
Publication date: 2021-03-05

Abstract

The invention discloses a composite carbon source sewage treating agent and a preparation method thereof, aiming at providing a composite carbon source sewage treating agent which can effectively improve the activity of microorganisms and the capability of nitrification and denitrification, greatly meet the requirements of sewage treatment plants, and is efficient, time-saving and labor-saving; the technical scheme comprises 20-30% of alcohol, 5-20% of carbohydrate, 5-10% of herbaceous plants, 5-10% of chitosan, 5-10% of organic acid, 0.2-1% of active peptide and the balance of water.

Description

Composite carbon source sewage treatment agent and preparation method thereof

Technical Field

The invention relates to the technical field of sewage treatment, in particular to a composite carbon source sewage treating agent and a preparation method thereof.

Background

As urbanization continues to develop, the types of sewage are diversified, and the influence on microorganisms is more serious. In the face of sewage with high nitrogen, phosphorus and low carbon, such as domestic sewage, and the like, a biological nitrogen and phosphorus removal method is required, and the sewage can be discharged into a receiving water body after reaching the standard so as to prevent the environment from being polluted.

The nitrification and denitrification are efficient biological denitrification technologies, and are widely applied to the field of sewage treatment at present. The activity of the activated sludge is greatly influenced due to the complex and diversified water samples.

At present, the carbon source provided on the market basically only meets the energy and growth source of the microorganism, and the improvement of the activity of the microorganism and the nitrification and denitrification capacity are not considered.

The invention develops a natural polymer, namely chitosan, which is widely available on the basis of the energy requirement of microorganisms. Chitosan has many unique properties of biodegradability, cell affinity, biological effect and the like, and is the only basic polysaccharide in natural polysaccharides. The chitosan can regulate the physiological activity of sewage, such as capturing trace heavy metals, regulating PH and the like, and has good regulation effect on microbial environment and biological activity.

Disclosure of Invention

Aiming at the problems, the invention aims to provide the composite carbon source sewage treatment agent which can effectively improve the microbial activity and the nitrification and denitrification nitrogen removal capability, greatly meets the requirements of sewage treatment plants, and is efficient, time-saving and labor-saving.

The second purpose of the invention is to provide a preparation method of the composite carbon source sewage treatment agent.

Therefore, the first technical scheme provided by the invention is as follows:

a composite carbon source sewage treatment agent comprises the following components in percentage by mass: 20-30% of alcohol, 5-20% of carbohydrate, 5-10% of herbaceous plants, 5-10% of chitosan, 5-10% of organic acid, 0.2-1% of active peptide and the balance of water.

Furthermore, the above composite carbon source sewage treatment agent is one or any combination of molasses, sucrose, glucose and fructose.

Further, in the composite carbon source sewage treatment agent, the alcohol is one of ethanol, ethylene glycol and glycerol or any combination thereof.

Furthermore, the herbaceous plant is one or any combination of water hyacinth and straw.

Further, the chitosan with deacetylation degrees of 55% -70%, 70% -85%, 85% -95% and 95% -100% is used as the composite carbon source sewage treatment agent.

Further, in the composite carbon source sewage treatment agent, the organic acid is formic acid or acetic acid.

The invention also provides a preparation method of the composite carbon source sewage treatment agent, which comprises the following steps:

s1, sequentially putting chitosan, organic acid and water into a reaction kettle, and fully stirring until the solution is oily and transparent;

and S2, slowly adding alcohol and saccharides, crushing herbaceous plants, adding the crushed herbaceous plants, uniformly stirring, curing, continuously stirring until the COD (chemical oxygen demand) is not less than 25 ten thousand mg/L, finally adding active peptide, uniformly mixing, and filtering to obtain the composite carbon source medicament.

Compared with the prior art, the technical scheme provided by the invention has the following technical advantages:

1. the chitosan-acetic acid aqueous solution prepared by the technical scheme provided by the invention is a colorless transparent solution, is a mixed solution with good biocompatibility and excellent degradability, and the degradation product of the mixed solution can also be used as a medicament and is a nontoxic and environment-friendly raw material. Meanwhile, the chitosan is used as natural alkaline sugar, so that the PH value of the compound medicament can be adjusted.

2. The saccharide substance provided by the technical scheme provided by the invention is a mixture, such as molasses, on one hand, provides hydrolyzable glucose, and on the other hand, contains some nitrogen, phosphorus and trace metal elements, and provides good growth requirements for microbial propagation. The carbon source has wide application and good effect in the biochemical treatment of sewage, so the practical application finds that the denitrification effect is greatly improved after the molasses is used as an additive and added into the composite carbon source.

3. The composite carbon source prepared by the formula and the production process has good water quality adaptability, effectively realizes the self growth capacity and the activity capacity of the activated sludge, promotes the ecological environment of the sludge, greatly improves the nitrification and denitrification efficiency, and is suitable for sewage treatment under the conditions of water quality environment change and unstable PH.

In summary: the carbon source is a composite product, enhances the microbial activity, regulates the microbial circulatory system, improves the nitrification and denitrification capacity, is efficient and environment-friendly, and reduces solid waste.

Detailed Description

The invention is further illustrated by the following examples, which are not to be construed as limiting the invention in any way, and any limited number of modifications which can be made by anyone within the scope of the claims are still within the scope of the claims.

Example 1

The invention provides a composite carbon source sewage treatment agent, which comprises the following components in percentage by mass: 30% of ethanol, 5% of fructose, 5% of water hyacinth, 10% of chitosan (the deacetylation degree is 55% -70%), 10% of acetic acid, 1% of active peptide and the balance of water.

Example 2

The invention provides a composite carbon source sewage treatment agent, which comprises the following components in percentage by mass: 20% of glycerol, 20% of molasses, 10% of water hyacinth, 5% of chitosan (the deacetylation degree is 70% -85%), 5% of organic acid, 0.2% of active peptide and the balance of water.

Example 3

The invention provides a composite carbon source sewage treatment agent, which comprises the following components in percentage by mass: 25% of ethylene glycol, 10% of glucose, 8% of water hyacinth, 2% of straw, 7% of chitosan (deacetylation degree is 85% -95%), 7% of acetic acid, 0.5% of active peptide and the balance of water.

Example 4

The invention provides a composite carbon source sewage treatment agent, which comprises the following components in percentage by mass: 5% of ethanol, 15% of ethylene glycol, 5% of molasses, 5% of straw, 5% of cane sugar, 5% of glucose, 6% of chitosan (deacetylation degree is 95% -100%), 6% of acetic acid, 0.4% of active peptide and the balance of water.

Example 5

The invention provides a composite carbon source sewage treatment agent, which comprises the following components in percentage by mass: 25% of ethylene glycol, 10% of glucose, 10% of fructose, 10% of straw, 6% of chitosan (degree of deacetylation is 55% -70%, 70% -85%, 85% -95%, 95% -100%), 8% of formic acid, 0.5% of active peptide and the balance of water.

Example 6

The invention provides a composite carbon source sewage treatment agent, which comprises the following components in percentage by mass: 22% of glycerol, 20% of glucose, 2% of water hyacinth, 8% of straw, 6% of chitosan (95% -100%), 9% of formic acid, 0.8% of active peptide and the balance of water.

The complex carbon source sewage treatment agents provided in examples 1 to 6 were prepared by the following methods:

s1, sequentially adding chitosan, organic acid and water into a reaction kettle, fully stirring until the solution becomes oily and transparent, and preparing a chitosan-acetic acid and water mixed solution as a raw material solution;

and S2, slowly adding alcohol and saccharides, crushing herbaceous plants, adding the crushed herbaceous plants, uniformly stirring, curing, continuously stirring until the COD (chemical oxygen demand) is not less than 25 ten thousand mg/L, finally adding active peptide, uniformly mixing, monitoring and adjusting reaction through an online pH analyzer and an online concentration analyzer, and conveying the product to a product storage tank after the reaction is finished and the product is qualified through stability analysis and test.

In order to prove the experimental effect of the present application, the present application performed denitrification experiments on the products of examples 1 to 6.

The experimental protocol was as follows:

the mixed liquor at the end of the aeration tank of the sewage plant is taken and measured in 8 groups (blank sample, respectively added with examples 1-6, and comparative example (meaning only glucose solid)).

Sample adding: 8 beakers of 1L were taken and added to the mixed solution at the end of the aeration tank of 1L.

2. After standing, taking supernatant, and detecting parameters: COD, total nitrogen, and nitrate nitrogen,

3. supplementing COD according to the total nitrogen value; and calculating the addition amount of COD/TN which is 5-20 times.

4. Placing a beaker on a six-linkage magnetic stirrer, placing magnetic beads, and adjusting the rotating speed of the magnetic beads to enable the stirring to generate small vortexes but no gas can be sucked in, so as to prevent oxygen enrichment; the rim of the beaker is sealed by a sealing film and a rubber band to prevent oxygen enrichment during stirring.

5. Sampling once every 1 or 2 hours according to the actual situation of the site, taking 5-10ml of supernatant (according to the requirement of an assay) after standing for 10min, and recording data, wherein the nitrate nitrogen content data of each time period is shown in table 1:

TABLE 1

The results of the removal rate of nitrate nitrogen are shown in Table 2:

TABLE 2

	1hW％	2hW％	4hW％
				Blank sample	0.47％	1.80％	2.73％
Example 1	41.33％	75.00％	96.07％
				Example 2	51.67％	80.67％	97.63％
Example 3	59.67％	83.00％	98.73％
				Example 4	62.33％	85.00％	99.23％
Example 5	48.67％	78.33％	98.20％
				Example 6	58.33％	84.67％	98.57％
Comparative example	29.67％	57.67％	84.63％

The formula for calculating the removal rate is as follows: w% (C)₀-C_x)/C₀

Wherein: c_XRepresenting the nitrate nitrogen content, C, of each time segment₀Representing the initial nitrate nitrogen content

The data show that the removal rate of the nitrate nitrogen of the composite carbon source for 4 hours is as high as 99.23 percent at most, and is obviously higher than that of a comparative example, and the removal rate is high. The technical scheme provided by the application has the efficient and quick removal effect.

The above-mentioned embodiments, objects, technical solutions and advantages of the present invention are further described in detail, it should be understood that the above-mentioned embodiments are only specific embodiments of the present invention, and are not intended to limit the scope of the present invention, and any modifications, equivalent substitutions, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.

Claims

1. The composite carbon source sewage treatment agent is characterized by comprising the following components in percentage by mass: 20-30% of alcohol, 5-20% of carbohydrate, 5-10% of herbaceous plants, 5-10% of chitosan, 5-10% of organic acid, 0.2-1% of active peptide and the balance of water.

2. The composite carbon source sewage treatment agent as claimed in claim 1, wherein the sugar substance is one or any combination of molasses, sucrose, glucose and fructose.

3. The composite carbon source sewage treatment agent as claimed in claim 1, wherein the alcohol is one of ethanol, ethylene glycol and glycerol or any combination thereof.

4. The composite carbon source sewage treating agent as claimed in claim 1, wherein the herbaceous plant is water hyacinth or straw.

5. The composite carbon source sewage treating agent as claimed in claim 1, wherein the chitosan is chitosan with deacetylation degree of 55-70%, 70-85%, 85-95%, 95-100%.

6. The composite carbon source sewage treatment agent as claimed in claim 1, wherein the organic acid is formic acid or acetic acid.

7. The composite carbon source sewage treatment agent as claimed in claim 1, wherein the active peptide is one or a mixture of more than two of glutathione and yeast active polypeptide.

8. The method for preparing the composite carbon source sewage treatment agent as claimed in claim 1, wherein the method comprises the following steps:

and S2, slowly adding alcohol and saccharides, crushing and adding the herbaceous plants, uniformly stirring, curing at the temperature of 50-100 ℃, continuously stirring until the COD is not less than 25 mg/L, finally adding active peptide, uniformly mixing, and filtering to obtain the composite carbon source medicament.