CN113233588A - Method for removing carbon by nitrosation, denitrification and denitrification of sewage with low carbon-nitrogen ratio - Google Patents
Method for removing carbon by nitrosation, denitrification and denitrification of sewage with low carbon-nitrogen ratio Download PDFInfo
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Abstract
The invention discloses a method for removing carbon by nitrosation and denitrification of sewage with low carbon-nitrogen ratio, which comprises the steps of inoculating nitrified sludge into an SBR reactor, adding zeolite to carry out microbial biofilm formation, introducing ammonia nitrogen sewage with low carbon-nitrogen ratio to carry out aeration for biochemical reaction, draining water when more than 90% of ammonia nitrogen is converted into nitrite nitrogen, repeating for many times, adding an organic carbon source when the nitrosation accumulation rate reaches more than 70%, enabling the C/N ratio of the sewage to be less than or equal to 5, and draining water when the ammonia nitrogen removal rate reaches more than 90%, repeating for many times, thereby completing the nitrosation, denitrification and carbon removal of the ammonia nitrogen sewage. The method is simple and efficient, has low investment cost, is suitable for treating low-concentration ammonia nitrogen sewage, and has the advantages of high treatment efficiency, high ammonia nitrogen removal rate, high nitrosation rate, stable nitrosation denitrification process, capability of reducing the aeration amount by more than half, great reduction in the input amount of organic carbon sources, energy conservation, consumption reduction, stability, reliability and the like.
Description
Technical Field
The invention relates to the technical field of biological treatment of sewage in environmental engineering, in particular to a method for removing carbon by nitrosation, denitrification and denitrification of sewage with a low carbon-nitrogen ratio.
Background
Domestic sewage, sludge digestion liquid, landfill leachate, fertilizer plant sewage and the like are typical sewage with low C/N ratio and are characterized by high ammonia nitrogen content and relatively low organic matter content. Using conventional A2When the/O biological denitrification process is used for treatment, the denitrification efficiency is low and the total nitrogen removal is limited due to insufficient carbon source. Therefore, a large amount of organic carbon sources need to be added in the denitrification stage to meet the denitrification effect of the sewage, which causes the increase of the sludge yield, thereby greatly increasing the sewage treatment cost and the operation cost. The nitrification and denitrification reactions in the traditional process are carried out separately, the denitrification process is complex, the denitrification period is long, and the denitrification efficiency is greatly reduced.
Chinese invention patent CN107473371B discloses a method for strengthening SBR to realize stable nitrosation by ammonia nitrogen adsorbing material, although the invention can realize stable nitrosation, the effluent water needs to enter other devices, and the aim of true denitrification can be achieved only after carbon source is added into other devices for denitrification. In view of the above problems, it is necessary to develop an economical and energy-saving method for removing nitrogen and carbon from sewage with low C/N ratio, which is of great significance in the field of ammonia nitrogen sewage removal.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide the method for removing the carbon by the nitrosation denitrification of the sewage with the low carbon-nitrogen ratio, which can realize the high and stable efficiency of the denitrification and the carbon removal by the nitrosation denitrification of the sewage with the low carbon-nitrogen ratio and greatly reduce the organic carbon source and the aeration amount in the same device.
In order to solve the technical problems, the invention adopts the following technical scheme.
A method for removing carbon by nitrosation, denitrification and denitrification of sewage with low carbon-nitrogen ratio comprises the following steps:
(1) inoculating the nitrified sludge into an SBR reactor, adding zeolite powder, aerating for 12-24 h, and carrying out microbial biofilm formation;
(2) introducing ammonia nitrogen sewage into the SBR reactor, wherein the concentration of the ammonia nitrogen sewage is 50-100 mg/L, the concentration of an organic carbon source in the ammonia nitrogen sewage is less than or equal to 20mg/L, controlling the pH value of the sewage to be 7.0-7.5, continuously aerating for biochemical reaction, stopping aeration when more than 90% of ammonia nitrogen in the sewage is converted into nitrite nitrogen or nitrate nitrogen, standing for precipitation, discharging partial water, wherein the water discharge accounts for 50-65% of the volume of the sewage, and finishing a reaction period;
(3) continuously introducing the ammonia nitrogen sewage into the SBR reactor, wherein the addition amount of the ammonia nitrogen sewage is the same as the water discharge amount of the previous step, controlling the pH value of the sewage to be 7.0-7.5, continuously aerating for biochemical reaction, stopping aeration when more than 90% of ammonia nitrogen in the sewage is converted into nitrite nitrogen or nitrate nitrogen, standing for precipitation, discharging partial water, wherein the water discharge amount accounts for 50-65% of the volume of the sewage, and finishing another reaction period;
(4) and (3) repeating the process in the step (3), when the nitrosation accumulation rate of the sewage in the SBR reactor reaches more than 70%, adding an organic carbon source into the SBR reactor to ensure that the C/N ratio of the sewage is less than or equal to 5, controlling the pH value of the sewage to be 7.0-7.5, continuously aerating, stopping aeration when the ammonia nitrogen removal rate of the sewage in the SBR reactor reaches more than 90%, standing for precipitation, discharging part of water, wherein the water discharge amount accounts for 50-65% of the volume of the sewage, completing a denitrification and decarbonization reaction period, continuously introducing ammonia nitrogen sewage and the organic carbon source into the SBR reactor to ensure that the C/N ratio of the sewage is less than or equal to 5, and repeating the denitrification and decarbonization reaction period to realize the nitrosation, denitrification and decarbonization of the ammonia nitrogen sewage with low carbon nitrogen ratio.
Preferably, in the step (1), the addition amount of the zeolite powder is 3mg/L to 10mg/L of ammonia nitrogen sewage, and the zeolite powder is zeolite powder sieved by a 50-100-mesh sieve.
Preferably, in the step (4), the organic carbon source is one or more of glucose, ethanol and sodium acetate, and the concentration of the organic carbon source is 100mg/L to 1000mg/L of sewage.
In the above method for removing carbon by nitrifying and denitrifying sewage with low carbon-nitrogen ratio, preferably, in the step (1), the MLSS concentration of the nitrified sludge in the SBR reactor is 3000 mg/L-4000 mg/L.
Preferably, in the above method for removing carbon by nitrifying and denitrifying sewage with low carbon-nitrogen ratio, in step (1), the nitrified sludge is acclimatized mature nitrified sludge.
Preferably, in the step (2), the temperature of the biochemical reaction is 15-35 ℃, the aeration needs to meet the requirement that dissolved oxygen DO is more than or equal to 1mg/L, the standing and precipitating time is 0.5-1 h, and the pH value is adjusted by using a sodium bicarbonate buffer solution or a potassium bicarbonate buffer solution.
Preferably, in the step (3), the temperature of the biochemical reaction is 15-35 ℃, the aeration needs to meet the requirement that dissolved oxygen DO is more than or equal to 1mg/L, the standing and precipitating time is 0.5-1 h, and the pH value is adjusted by using a sodium bicarbonate buffer solution or a potassium bicarbonate buffer solution.
Preferably, in the step (4), the process of the step (3) is repeated for 2 to 3 times, and the denitrification and decarbonization reaction cycle is repeated for more than 10 times.
In the invention, the SBR reactor is a sequencing batch reactor, the MLSS concentration is the suspended solid concentration, and the nitrosation accumulation rate is the concentration of nitrite nitrogen/the sum of the concentrations of nitrite nitrogen and nitrate nitrogen in the sewage in the SBR reactor.
Compared with the prior art, the invention has the advantages that:
(1) the method of the invention adopts zeolite as a carrier, so that microorganisms can form a biological membrane on the carrier, and because the inner layer and the outer layer of the biological membrane have certain oxygen concentration gradient, the method provides respective required environments for the growth of aerobic flora and anaerobic flora, and the aerobic nitrobacteria are gathered on the outer layer of the biological membrane and the anaerobic denitrifying bacteria are gathered on the inner layer of the biological membrane. Due to the existence of the outer layer aerobic Ammonia Oxidizing Bacteria (AOB), ammonia nitrogen in the sewage is converted into nitrite nitrogen to realize nitrosation, and due to the existence of the inner layer anaerobic denitrifying bacteria, the nitrite nitrogen is converted into nitrogen by using an organic carbon source in an anaerobic state, so that the nitrogen and carbon removal of the sewage with low carbon-nitrogen ratio and ammonia nitrogen is realized, as shown in figure 1.
The zeolite has good adsorption effect, the dynamic balance between the concentration of free ammonia on the surface of the zeolite in sewage and the concentration of the free ammonia in an SBR reactor can be effectively controlled through the adsorption-desorption process of the zeolite, microorganisms are attached to the surface of the zeolite in the nitration reaction process, nitrite oxidizing bacteria can be selectively inhibited without affecting ammonia oxidizing bacteria due to the existence of the free ammonia, bacterial colonies mainly comprising the ammonia oxidizing bacteria are gradually formed on the surface of the zeolite, and therefore stable nitrosation of ammonia nitrogen sewage is realized, and enrichment of nitrite nitrogen is realized. In the inner layer of the zeolite biomembrane, denitrifying bacteria in an anaerobic state utilize nitrite nitrogen and an organic carbon source to carry out denitrification reaction.
(2) The invention carries out denitrification and decarbonization in the SBR reactor, and in the process of treating ammonia nitrogen sewage, the ammonia nitrogen in the sewage is converted into nitrite nitrogen or nitrate nitrogen in aerobic environment, the denitrification and decarbonization of the nitrite nitrogen or nitrate nitrogen are carried out under anaerobic condition, so the denitrification and decarbonization of the ammonia nitrogen sewage can be synchronously realized in the same reaction vessel by separating the nitrite nitrogen and the nitrate nitrogen in the prior art, on one hand, the method benefits from zeolite carriers, after the zeolite is coated, the formed oxygen concentration interval creates respective required environment for the growth of two types of microorganisms, on the other hand, the zeolite also plays the role of an ion exchanger, free ammonia is regulated and controlled by adsorbing ammonia nitrogen to control nitrosation, and formed nitrite nitrogen is subjected to denitrification and decarbonization by denitrifying bacteria under the inner anaerobic environment of a biomembrane, so that technical support is provided for the implementation of low-carbon denitrification.
(3) In the invention, when the nitrosation accumulation rate of the sewage in the SBR reactor reaches more than 70 percent, the added organic carbon source is utilized to convert nitrite nitrogen into nitrogen, thereby realizing the effective denitrification and carbon removal of ammonia nitrogen sewage. When the nitrosation accumulation rate is less than 70%, a large amount of nitrate nitrogen exists in the sewage, and considering that the treated ammonia nitrogen sewage has a low carbon-nitrogen ratio, the concentration of organic matters in the sewage is insufficient to assist the completion of the denitrification process, the condition of low total nitrogen removal rate can occur, and the ammonia nitrogen in the sewage can not be completely converted into nitrogen so as to be removed.
(4) The method is simple and efficient, has low investment cost, is suitable for treating low-concentration ammonia nitrogen sewage, and has the advantages of high treatment efficiency, high ammonia nitrogen removal rate, high nitrosation rate, stable nitrosation denitrification process, capability of reducing the aeration amount by more than half, great reduction in the input amount of organic carbon sources, energy conservation, consumption reduction, stability, reliability and the like.
Drawings
FIG. 1 is a schematic diagram of a zeolite surface nitrosation denitrification mechanism in an embodiment of the present invention.
Detailed Description
The invention is further described below with reference to the drawings and specific preferred embodiments of the description, without thereby limiting the scope of protection of the invention. The materials and equipment used in the following examples are commercially available.
Example 1
The invention relates to a method for removing carbon by nitrosation, denitrification and denitrification of sewage with low carbon-nitrogen ratio, which comprises the following steps:
(1) inoculating mature nitrified sludge (such as nitrified sludge in a sewage plant) into an SBR reactor, wherein the MLSS concentration of the nitrified sludge is 3000mg/L, adding zeolite powder filler which is sieved by a 50-100-mesh sieve, wherein the adding amount of the zeolite powder is 10mg of zeolite added to each liter of sewage, aerating for 12 hours, and carrying out microbial biofilm formation;
(2) introducing ammonia nitrogen sewage with the concentration of 100mg/L, wherein the concentration of an organic carbon source in the ammonia nitrogen sewage is less than or equal to 20mg/L, adjusting the pH value of the solution in the SBR reactor to 7.5 by adopting a sodium bicarbonate buffer solution, carrying out continuous aeration at normal temperature to carry out biochemical reaction, controlling aeration dissolved oxygen DO to be more than or equal to 1mg/L, stopping aeration when 90% of ammonia nitrogen in the sewage in the SBR reactor is converted into nitrite nitrogen or nitrate nitrogen, standing and precipitating for 1h, discharging part of water in the SBR reactor, wherein the part of the water is 65% of the volume of the sewage in the SBR reactor, and finishing a reaction period;
(3) continuously introducing ammonia nitrogen sewage with the concentration of 100mg/L, wherein the introduction amount of the ammonia nitrogen sewage is the same as the sewage discharge amount in the step (2), adjusting the pH value of the solution in the SBR reactor to be 7.5 by adopting a sodium bicarbonate buffer solution, continuously aerating at normal temperature to carry out biochemical reaction, controlling the aerated dissolved oxygen DO to be more than or equal to 1mg/L, stopping aeration when 90% of ammonia nitrogen in the sewage in the SBR reactor is converted into nitrite nitrogen or nitrate nitrogen, standing and precipitating for 1h, discharging part of water in the SBR reactor, wherein the part of the water is 65% of the sewage volume in the SBR reactor, and finishing another reaction period;
(4) and (3) repeating the process of the step (3) for 2 times, when the nitrosation accumulation rate of the sewage in the SBR reactor reaches 70%, starting to add glucose serving as an organic carbon source into the SBR reactor, wherein the addition amount of the glucose is 200mg/L, so that the C/N ratio of the ammonia nitrogen sewage is 2, adjusting the pH value of the solution to be 7.5 by using a sodium bicarbonate buffer solution, continuously aerating at normal temperature, stopping aeration when the ammonia nitrogen removal rate of the sewage in the SBR reactor reaches over 90%, standing and precipitating for 1h, discharging part of water in the SBR reactor, wherein the part of the water is 65% of the volume of the sewage in the SBR reactor, and completing a denitrification carbon removal reaction period. And (2) continuously introducing ammonia nitrogen sewage and an organic carbon source into the SBR reactor to ensure that the C/N ratio of the ammonia nitrogen sewage is 2, and after more than 10 periods of operation, the ammonia nitrogen concentration of the effluent is less than or equal to 10mg/L, and the COD concentration of the effluent is less than or equal to 30mg/L, thereby realizing the nitrosation denitrification carbon removal of the ammonia nitrogen sewage with low carbon-nitrogen ratio.
Example 2
The invention relates to a method for removing carbon by nitrosation, denitrification and denitrification of sewage with low carbon-nitrogen ratio, which comprises the following steps:
(1) inoculating mature nitrified sludge into an SBR reactor, wherein the MLSS concentration of the nitrified sludge is 4000mg/L, adding zeolite powder which is sieved by a 50-100-mesh sieve, wherein the adding amount of the zeolite powder is 3mg of zeolite added in each liter of sewage, aerating for 18h, and carrying out microbial biofilm formation.
(2) Introducing ammonia nitrogen sewage with the concentration of 100mg/L, wherein the concentration of an organic carbon source in the ammonia nitrogen sewage is less than or equal to 20mg/L, adjusting the pH value of the solution in the SBR reactor to 7.5 by adopting a sodium bicarbonate buffer solution, carrying out continuous aeration at normal temperature to carry out biochemical reaction, controlling aeration dissolved oxygen DO to be more than or equal to 1mg/L, stopping aeration when 90% of ammonia nitrogen in the sewage in the SBR reactor is converted into nitrite nitrogen or nitrate nitrogen, standing and precipitating for 1h, discharging part of water in the SBR reactor, wherein the part of the water is 65% of the volume of the sewage in the SBR reactor, and finishing a reaction period;
(3) continuously introducing ammonia nitrogen sewage with the concentration of 100mg/L, wherein the introduction amount of the ammonia nitrogen sewage is the same as the discharge amount in the step (2), adjusting the pH value of the solution in the SBR reactor to be 7.5 by adopting a sodium bicarbonate buffer solution, continuously aerating at normal temperature to carry out biochemical reaction, controlling the aerated dissolved oxygen DO to be more than or equal to 1mg/L, stopping aeration when 90% of ammonia nitrogen in the sewage in the SBR reactor is converted into nitrite nitrogen or nitrate nitrogen, standing and precipitating for 1h, discharging part of water in the SBR reactor, wherein the part of water is 65% of the volume of the sewage in the SBR reactor, and finishing another reaction period;
(4) and (4) repeating the process of the step (3) for 2 times, adding an organic carbon source glucose into the SBR when the nitrosation accumulation rate of the sewage in the SBR reaches 80%, wherein the addition amount of the glucose is 300mg/L, the C/N ratio of the ammonia nitrogen sewage is 3, adjusting the pH value of the solution to be 7.5 by using sodium bicarbonate, continuously aerating at normal temperature, stopping aeration when the ammonia nitrogen removal rate of the sewage in the SBR reaches more than 90%, standing and precipitating for 1h, discharging part of water in the SBR, wherein the part of the water is 65% of the volume of the sewage in the SBR, and finishing a denitrification and decarbonization reaction period. And (2) continuously introducing ammonia nitrogen sewage and an organic carbon source into the SBR reactor to ensure that the C/N ratio of the ammonia nitrogen sewage is 3, wherein after more than 10 periods of operation, the ammonia nitrogen concentration of the effluent is less than or equal to 10mg/L, and the COD concentration of the effluent is less than or equal to 30mg/L, so that the nitrosation denitrification carbon removal of the ammonia nitrogen sewage with the low carbon-nitrogen ratio is realized.
Comparative example
A method for removing carbon by nitrifying and denitrifying sewage with low carbon-nitrogen ratio is basically the same as the process of the embodiment 1, and the difference is only that: and (3) in the step (2) and the step (3), when 50% of ammonia nitrogen in the sewage in the SBR reactor is converted into nitrite nitrogen or nitrate nitrogen, performing subsequent operation, in the step (4), adding glucose after the SBR nitrosation accumulation rate reaches 70%, performing subsequent operation, and after 5 periods of operation, beginning to collapse the system, wherein the ammonia nitrogen concentration and the COD concentration of the effluent are both higher than the concentration of the inlet water.
The foregoing is merely a preferred embodiment of the invention and is not intended to limit the invention in any manner. Although the present invention has been described with reference to the preferred embodiments, it is not intended to be limited thereto. Those skilled in the art can make many possible variations and modifications to the disclosed embodiments, or equivalent modifications, without departing from the spirit and scope of the invention, using the methods and techniques disclosed above. Therefore, any simple modification, equivalent replacement, equivalent change and modification made to the above embodiments according to the technical essence of the present invention are still within the scope of the protection of the technical solution of the present invention.
Claims (9)
1. A method for removing carbon by nitrifying and denitrifying sewage with low carbon-nitrogen ratio is characterized by comprising the following steps:
(1) inoculating the nitrified sludge into an SBR reactor, adding zeolite powder, aerating for 12-24 h, and carrying out microbial biofilm formation;
(2) introducing ammonia nitrogen sewage into the SBR reactor, wherein the concentration of the ammonia nitrogen sewage is 50-100 mg/L, the concentration of an organic carbon source in the ammonia nitrogen sewage is less than or equal to 20mg/L, controlling the pH value of the sewage to be 7.0-7.5, continuously aerating for biochemical reaction, stopping aeration when more than 90% of ammonia nitrogen in the sewage is converted into nitrite nitrogen or nitrate nitrogen, standing for precipitation, discharging partial water, wherein the water discharge accounts for 50-65% of the volume of the sewage, and finishing a reaction period;
(3) continuously introducing the ammonia nitrogen sewage into the SBR reactor, wherein the addition amount of the ammonia nitrogen sewage is the same as the water discharge amount of the previous step, controlling the pH value of the sewage to be 7.0-7.5, continuously aerating for biochemical reaction, stopping aeration when more than 90% of ammonia nitrogen in the sewage is converted into nitrite nitrogen or nitrate nitrogen, standing for precipitation, discharging partial water, wherein the water discharge amount accounts for 50-65% of the volume of the sewage, and finishing another reaction period;
(4) and (3) repeating the process in the step (3), when the nitrosation accumulation rate of the sewage in the SBR reactor reaches more than 70%, adding an organic carbon source into the SBR reactor to ensure that the C/N ratio of the sewage is less than or equal to 5, controlling the pH value of the sewage to be 7.0-7.5, continuously aerating, stopping aeration when the ammonia nitrogen removal rate of the sewage in the SBR reactor reaches more than 90%, standing for precipitation, discharging part of water, wherein the water discharge amount accounts for 50-65% of the volume of the sewage, completing a denitrification and decarbonization reaction period, continuously introducing ammonia nitrogen sewage and the organic carbon source into the SBR reactor to ensure that the C/N ratio of the sewage is less than or equal to 5, and repeating the denitrification and decarbonization reaction period to realize the nitrosation, denitrification and decarbonization of the ammonia nitrogen sewage with low carbon nitrogen ratio.
2. The method for removing carbon by nitrosation, denitrification and denitrogenation of sewage with low carbon-nitrogen ratio as claimed in claim 1, wherein in step (1), the addition amount of the zeolite powder is 3mg/L to 10mg/L of the ammonia nitrogen sewage, and the zeolite powder is zeolite powder which is sieved by a 50-100 mesh sieve.
3. The method for removing carbon by nitrosation, denitrification and denitrogenation of the sewage with the low carbon-nitrogen ratio as claimed in claim 1 or 2, wherein in the step (4), the organic carbon source is one or more of glucose, ethanol and sodium acetate, and the concentration of the organic carbon source is 100mg/L sewage to 1000mg/L sewage.
4. The method for removing carbon by nitrosation, denitrification and denitrogenation of the sewage with low carbon-nitrogen ratio according to claim 1 or 2, wherein in the step (1), the MLSS concentration of the nitrified sludge in the SBR reactor is 3000 mg/L-4000 mg/L.
5. The method for removing carbon by nitrifying and denitrifying sewage with low carbon-nitrogen ratio according to claim 1 or 2, characterized in that in step (1), the nitrified sludge is acclimated mature nitrified sludge.
6. The method for removing the carbon by the nitrosation denitrification of the sewage with the low carbon-nitrogen ratio according to the claim 1 or 2, wherein in the step (2), the temperature of the biochemical reaction is 15-35 ℃, the aeration is required to meet the requirement that the DO is more than or equal to 1mg/L, the standing and precipitating time is 0.5-1 h, and the pH value is adjusted by sodium bicarbonate buffer solution or potassium bicarbonate buffer solution.
7. The method for removing the carbon by the nitrosation denitrification of the sewage with the low carbon-nitrogen ratio according to the claim 1 or 2, wherein in the step (3), the temperature of the biochemical reaction is 15-35 ℃, the aeration is required to meet the requirement that the DO is more than or equal to 1mg/L, the standing and precipitating time is 0.5-1 h, and the pH value is adjusted by sodium bicarbonate buffer solution or potassium bicarbonate buffer solution.
8. The method for removing the carbon by the nitrosation, denitrification and denitrogenation of the sewage with the low carbon-nitrogen ratio according to the claim 1 or 2, wherein in the step (4), the aeration is required to meet the requirement that the DO is more than or equal to 1mg/L, the standing and precipitating time is 0.5 h-1 h, and the pH value is adjusted by using a sodium bicarbonate buffer solution or a potassium bicarbonate buffer solution.
9. The method for removing nitrogen and carbon by nitrifying and denitrifying sewage with low carbon-nitrogen ratio according to claim 1 or 2, characterized in that in the step (4), the process of the step (3) is repeated for 2 to 3 times, and the reaction cycle of nitrogen and carbon removal is repeated for more than 10 times.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115487666A (en) * | 2022-08-26 | 2022-12-20 | 福州大学 | High-efficiency conversion of NO in flue gas into N 2 Method of O |
| CN115487666B (en) * | 2022-08-26 | 2023-09-12 | 福州大学 | Efficient conversion of NO in flue gas to N 2 O method |
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