CN112279370B - Preparation method of denitrification carbon source for sewage treatment - Google Patents
Preparation method of denitrification carbon source for sewage treatment Download PDFInfo
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- CN112279370B CN112279370B CN202011091516.3A CN202011091516A CN112279370B CN 112279370 B CN112279370 B CN 112279370B CN 202011091516 A CN202011091516 A CN 202011091516A CN 112279370 B CN112279370 B CN 112279370B
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- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/28—Anaerobic digestion processes
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/28—Treatment of water, waste water, or sewage by sorption
- C02F1/286—Treatment of water, waste water, or sewage by sorption using natural organic sorbents or derivatives thereof
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Abstract
The invention discloses a preparation method of a denitrification carbon source for sewage treatment, which comprises the following steps: dissolving polyamino acid or sodium salt thereof and inorganic base in glycerol, immersing starch in the solution and mixing the following components in percentage by weight: starch, polyamino acid or sodium salt thereof, inorganic base, glycerol =1, (4-8), (0.5-10), (20-40) are reacted, the reaction temperature is 100-120 ℃, the reaction time is 10-20 h, after the reaction is finished, polyvinyl alcohol and an emulsifier are added, the mixture is mixed according to the mass ratio of (2-4) to (1-2) to (0.5-1) and reacted for 1-2 h at the temperature of 60-80 ℃, the temperature is reduced to room temperature, a coagulant aid, trace elements and vitamins are added, the mixture is uniformly stirred and dried, and the denitrification carbon source is obtained. The denitrification carbon source prepared by the method has high denitrification total nitrogen removal rate and small using amount, and compared with a simple carbon source, the denitrification total nitrogen removal efficiency and capability have obvious technical advantages in short-term and long-term processes.
Description
Technical Field
The invention belongs to the technical field related to denitrification in sewage treatment, and particularly relates to a preparation method of a denitrification carbon source for sewage treatment.
Background
The biological denitrification mechanism is as follows: the basic principle of biological denitrification of sewage is to convert organic nitrogen into ammonia nitrogen by nitrification in an aerobic section and by the synergistic effect of nitrifying bacteria and nitrosobacteria, the ammonia nitrogen is converted into nitrite nitrogen and nitrate nitrogen through nitrification. Under the anoxic condition, nitrate nitrogen is converted into nitrogen gas through denitrification, and the overflowed water surface is released to the atmosphere to participate in the circulation of natural nitrogen, so that nitrogen-containing substances in water are greatly reduced, the potential danger of effluent is reduced, and the aim of removing nitrogen from wastewater is fulfilled.
In sewage plants with the functions of nitrogen and phosphorus removal, organic matters are mainly consumed in the aspects of phosphorus release, denitrification, growth of heterotrophic bacteria and the like. However, the easily degradable COD (chemical oxygen demand) contained in the general urban sewage is limited, in a low-carbon source sewage treatment system, the phenomenon that COD/TN (ratio of chemical oxygen demand to total nitrogen) is lower is more prominent, the content of VFAs (volatile fatty acids) is more limited, and the shortage of carbon sources becomes a limiting factor of denitrification and phosphorus release, so in a biological nitrogen and phosphorus removal system, phosphorus accumulating bacteria and denitrifying bacteria compete due to the shortage of carbon sources to influence the removal effect, so that under the current water inlet condition, the nitrogen and phosphorus removal efficiency is generally lower only by virtue of biological action. Therefore, in the denitrification process, the added carbon source is an essential process in the biochemical treatment of sewage with low C/N (COD/total nitrogen), and the carbon source content can limit the efficiency and the effect of heterotrophic denitrification on removing the total nitrogen.
In order to improve the denitrification efficiency, scholars at home and abroad carry out a plurality of research works and have relevant literature disclosures. For example, chinese patent application No. CN201610747796.6 discloses a high calcium high salt wastewater denitrification carbon source, which is composed of an electron donor component, a scale inhibition component, a denitrification control component and an auxiliary component. The high-calcium high-salt sewage denitrification carbon source disclosed by the invention effectively reduces the total nitrogen in sewage, effectively prevents hard calcium deposition, adapts to water quality fluctuation and keeps stable operation of a sewage treatment system. Because the electron donor of the organic electroluminescent material relates to methanol, ethanol and other substances, the substances have certain toxicity and are flammable and explosive dangerous articles, and the practical application of the organic electroluminescent material has difficulty.
For another example, chinese patent application No. CN201210442218.3 discloses the use of beanstalk as a biological denitrification carbon source, which is inoculated with activated sludge and used for denitrification treatment of water body, and can remove most of nitrogen elements in water body in a short time, and the beanstalk has wide sources and low cost. The beanstalk is used as a carbon source to carry out denitrification treatment on the aquaculture circulating water, so that the nitrate nitrogen concentration in the circulating system is not more than 10mg/L and the pH value is kept to be 7-8 stably under the conditions of no water change and no medicament addition. The denitrification system provided by the invention has the advantages of simple structure and strong practicability, can be conveniently used in various circulating aquaculture systems, and has very wide application prospect. In the document, only beanstalk is used as a carbon source in the denitrification process, and the ingredients of the beanstalk are single and cannot meet the requirement of growth of denitrifying bacteria.
Based on the above, a carbon source for denitrification process in sewage treatment is expected, which not only has wide source but also has other nutrients required by denitrifying bacteria.
Disclosure of Invention
The invention mainly aims to overcome the defects in the prior art and provide a preparation method of a denitrification carbon source for sewage treatment. The carbon source of the invention has rich sources, can effectively improve the denitrification rate, and has good practicability to water quality and flora.
The purpose of the invention and the technical problem to be solved are realized by adopting the following technical scheme.
The invention provides a preparation method of a denitrification carbon source for sewage treatment, which comprises the following steps:
dissolving polyamino acid or sodium salt thereof and inorganic base in glycerol, immersing starch in the solution and mixing the following components in percentage by weight: starch, polyamino acid or sodium salt thereof, inorganic base, glycerol =1, (4-8), (0.5-10), (20-40) are reacted, the reaction temperature is 100-120 ℃, the reaction time is 10-20 h, after the reaction is finished, polyvinyl alcohol and an emulsifier are added, the mixture is mixed according to the mass ratio of (2-4) to (1-2) to (0.5-1) and reacted for 1-2 h at the temperature of 60-80 ℃, the temperature is reduced to room temperature, a coagulant aid, trace elements and vitamins are added, the mixture is uniformly stirred and dried, and the denitrification carbon source is obtained.
The preparation method of the foregoing, wherein the inorganic base comprises sodium oxide, potassium hydroxide, sodium carbonate, potassium carbonate, sodium bicarbonate or potassium bicarbonate.
In the above production method, the polyamino acid has a viscosity average molecular weight of 30000 to 40000.
The production method of the foregoing, wherein the polyamino acid is poly (L-glutamic acid) and/or poly (L-aspartic acid).
In the preparation method, the emulsifier is glycerol monostearate and/or sodium stearoyl lactylate.
In the preparation method, the coagulant aid, the trace elements and the vitamins are added according to the mass ratio of (1-2) to (0.001-0.005).
The denitrification carbon source for sewage treatment is characterized in that the coagulant aid is one or more selected from agar, gelatin, guar gum and acacia gum.
The denitrification carbon source for sewage treatment comprises Mg 2+ ，Fe 3+ ，Zn 2+ ，Cu 2+ ，K + 。
The denitrification carbon source for sewage treatment comprises vitamin B 1 And/or vitamin B 12 。
By the technical scheme, the invention at least has the following advantages: the invention introduces carboxyl and amino through chemical grafting of starch and polyamino acid to obtain a modified starch material rich in carboxyl and amino, and can be used for adsorbing, removing or separating and extracting various metal ions, acid radical ions and organic molecules in water by utilizing the ion exchange and complexing functions of the carboxyl and the amino. In addition, the polyamino acid can promote the activity of microorganisms in the denitrification process after being complexed with starch, and the denitrification utilization is good. The invention can better disperse the polyvinyl alcohol in a modified starch system through the emulsification of the emulsifier, is used for the denitrification carbon source, and has rich and sufficient sources. The carbon source of the invention is also added with trace elements and vitamins, which can provide necessary living matters for microorganisms, effectively improve the biological activity and the reverse digestion efficiency and ensure that the utilization amount of the carbon source is small.
In conclusion, the special denitrification carbon source for sewage treatment has rich sources, can effectively improve the denitrification rate, and has good practicability to water quality and flora. The method has the advantages and practical value, does not have similar design publication or use in the similar products and methods, is innovative, has great improvement on the method or the function, has great technical progress, produces good and practical effects, has multiple enhanced efficacies compared with the prior products, is more suitable for practical use, has industrial wide utilization value, and is a novel, improved and practical new design.
The foregoing is a summary of the present invention, and the following is a detailed description of the preferred embodiments of the present invention in order to provide a clear understanding of the technical features of the present invention.
Detailed Description
In order to make the technical means, the creation characteristics, the achievement purposes and the effects of the invention easy to understand, the technical solutions in the embodiments of the invention will be clearly and completely described below with reference to the embodiments of the invention, and it is obvious that the described embodiments are only a part of the embodiments of the invention, and not all the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
Dissolving 60g of poly (L-glutamic acid) (molecular viscosity of 40000) and 50g of potassium hydroxide in 300mL of glycerol, immersing 10g of starch in the solution for reaction at 110 ℃ for 15h to obtain a mixed solution after the reaction is finished, adding 20g of polyvinyl alcohol and 8g of glyceryl monostearate into the mixed solution, uniformly stirring, reacting at 70 ℃ for 2h, cooling to room temperature, adding 15g of agar and trace elements (Mg) 2+ ，Fe 3+ ，Zn 2+ ，Cu 2+ ，K + Mixture of) 0.03g and vitamin B 1 0.02g, uniformly stirring and drying to obtain the denitrification carbon source.
Example 2
Dissolving 40g of poly (L-aspartic acid) (molecular viscosity of 30000) and 50g of sodium carbonate in 200mL of glycerol, immersing 10g of starch in the solution for reaction at 120 ℃ for 10 hours to obtain a mixed solution after the reaction is finished, and adding the mixed solution into the mixed solutionAdding 10g polyvinyl alcohol and 5g glyceryl monostearate, stirring, reacting at 80 deg.C for 1 hr, cooling to room temperature, adding gelatin 15g, and trace elements (Mg) 2+ ，Fe 3+ ，Zn 2+ ，Cu 2+ ，K + Mixed) 0.03g and vitamin B 12 0.02g, then uniformly stirring and drying to obtain the denitrification carbon source.
Example 3
Dissolving 80g of poly (L-aspartic acid) (the molecular viscosity is 30000) and 100g of sodium carbonate in 400mL of glycerol, then immersing 10g of starch in the solution for reaction at the temperature of 100 ℃ for 20h to obtain a mixed solution after the reaction is finished, then adding 20g of polyvinyl alcohol and 5g of sodium stearoyl lactylate into the obtained mixed solution, uniformly stirring, reacting for 2h at the temperature of 60 ℃, cooling to room temperature, adding 15g of gelatin and trace elements (Mg) 2+ ，Fe 3+ ，Zn 2+ ，Cu 2+ ，K + Mixed) 0.03g and vitamin B 1 And B 12 0.02g, then evenly stirring and drying to obtain the denitrification carbon source.
Example 4
Dissolving 40g of poly (L-aspartic acid) (molecular viscosity is 35000) and 100g of sodium bicarbonate in 400mL of glycerol, then immersing 10g of starch in the solution for reaction at the temperature of 110 ℃ for 18h to obtain a mixed solution after the reaction is finished, then adding 15g of polyvinyl alcohol and 5g of glyceryl stearate into the obtained mixed solution, uniformly stirring, reacting at the temperature of 70 ℃ for 2h, cooling to room temperature, and adding 10g of agar and trace elements (Mg) 2+ ，Fe 3+ ，Zn 2+ ，Cu 2+ ，K + Mixture of) 0.05g and vitamin B 2 0.01g, then evenly stirring and drying to obtain the denitrification carbon source.
Example 5
Dissolving 80g of poly (L-glutamic acid) (molecular viscosity of 30000) and 80g of sodium carbonate in 350mL of glycerol, immersing 10g of starch in the solution for reaction at 110 ℃ for 16h to obtain a mixed solution after the reaction is finished,then adding 20g of polyvinyl alcohol and 5g of sodium stearyl lactate into the obtained mixed solution, stirring uniformly, reacting at 70 ℃ for 1h, cooling to room temperature, adding 20g of Arabic gum and trace elements (Mg) 2+ ，Fe 3+ ，Zn 2+ ，Cu 2+ ，K + Mixture of) 0.01g and vitamin B 1 And B 12 0.05g, then evenly stirring and drying to obtain the denitrification carbon source.
Example 6
Dissolving 60g of poly (L-aspartic acid) (molecular viscosity of 40000) and 80g of potassium bicarbonate in 300mL of glycerol, immersing 10g of starch in the solution for reaction at 120 ℃ for 14h to obtain a mixed solution after the reaction is finished, adding 20g of polyvinyl alcohol and 5g of glyceryl stearate into the mixed solution, uniformly stirring, reacting at 80 ℃ for 1h, cooling to room temperature, adding 10g of Arabic gum and trace elements (Mg) 2+ ，Fe 3+ ，Zn 2+ ，Cu 2+ ，K + Mixed) 0.01g and vitamin B 1 0.01g, then evenly stirring and drying to obtain the denitrification carbon source.
Comparative example 1
Stirring 10g starch, 20g polyvinyl alcohol and 8g glyceryl monostearate uniformly, reacting at 70 deg.C for 2 hr, cooling to room temperature, adding agar 15g, and trace elements (Mg) 2+ ，Fe 3+ ，Zn 2+ ，Cu 2+ ，K + Mixture of) 0.03g and vitamin B 1 0.02g, stirring evenly and drying to obtain the denitrification carbon source.
Experimental example 1 Effect of denitrified carbon Source on Denitrification Rate and Total Nitrogen removal
Selecting a water sample at an anaerobic section of a certain sewage plant to carry out denitrification test, wherein the sludge concentration is 4000-4500 mg/L, and the total nitrogen and COD of the raw water are 67mg/L and 80mg/L respectively. 1000mL of water sample was stirred in a stirrer at the same speed, the denitrification carbon sources of examples 1 to 6 and comparative example 1 were added as additional carbon sources, and the influence thereof on the denitrification rate and the total nitrogen removal rate was counted, and the results are shown in Table 1.
TABLE 1 Effect of denitrogenated carbon sources on Denitrification Rate and Total Nitrogen removal
As can be seen from the results in table 1, the denitrification carbon sources of examples 1 to 6 according to the present invention have higher denitrification rate and COD utilization rate, higher total denitrification nitrogen removal rate, and lower consumption than the denitrification carbon source of comparative example 1, and have significant technical advantages in both short-term and long-term processes in total denitrification nitrogen removal rate and capacity than the simple carbon source.
Although the present invention has been described with reference to a preferred embodiment, it should be understood that various changes, substitutions and alterations can be made herein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (7)
1. A method for preparing a denitrification carbon source for sewage treatment comprises the following steps:
dissolving polyamino acid or sodium salt thereof and inorganic base in glycerol to obtain a solution, and immersing starch in the solution according to the weight ratio: reacting starch, polyamino acid or sodium salt thereof, inorganic base, glycerol =1 (4-8) (0.5-10) (20-40), reacting at the temperature of 100-120 ℃ for 10-20h, adding polyvinyl alcohol and an emulsifier after the reaction is finished, mixing according to the mass ratio of (2-4) - (1-2) (0.5-1), reacting at the temperature of 60-80 ℃ for 1-2h, cooling to room temperature, adding a coagulant aid, trace elements and vitamins, stirring uniformly, and drying to obtain a denitrification carbon source; the viscosity average molecular weight of the polyamino acid is 30000 to 40000; the polyamino acid is poly (L-glutamic acid) and/or poly (L-aspartic acid).
2. The method for preparing a denitrification carbon source for wastewater treatment according to claim 1, wherein the inorganic base comprises sodium oxide, potassium hydroxide, sodium carbonate, potassium carbonate, sodium bicarbonate or potassium bicarbonate.
3. The method for preparing a denitrification carbon source for sewage treatment according to claim 1, wherein the emulsifier is glycerol monostearate and/or sodium stearoyl lactylate.
4. The method for preparing a denitrification carbon source for sewage treatment according to claim 1, wherein the coagulant aid, the trace elements and the vitamins are added in the mass ratio of (1) - (2) - (0.001) - (0.005).
5. The method for preparing a denitrification carbon source for wastewater treatment according to claim 1, wherein the coagulant aid is one or more selected from agar, gelatin, guar gum and acacia gum.
6. The method for preparing a denitrification carbon source for wastewater treatment according to claim 1, wherein the trace elements comprise Mg 2+ ，Fe 3+ ，Zn 2+ ，Cu 2+ ，K + 。
7. The method for preparing a denitrification carbon source for wastewater treatment according to claim 1, wherein the vitamin is vitamin B 1 And/or vitamin B 12 。
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| CN107777790B (en) * | 2016-08-29 | 2021-06-08 | 中国石油化工股份有限公司 | High-calcium high-salt sewage denitrification carbon source |
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