CN112479370A - Sewage autotrophic nitrogen removal device and method - Google Patents
Sewage autotrophic nitrogen removal device and method Download PDFInfo
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- CN112479370A CN112479370A CN202011244674.8A CN202011244674A CN112479370A CN 112479370 A CN112479370 A CN 112479370A CN 202011244674 A CN202011244674 A CN 202011244674A CN 112479370 A CN112479370 A CN 112479370A
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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
- C02F3/00—Biological treatment of water, waste water, or sewage
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- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
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- C02F3/006—Regulation methods for biological treatment
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- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
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- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/30—Aerobic and anaerobic processes
- C02F3/302—Nitrification and denitrification treatment
- C02F3/307—Nitrification and denitrification treatment characterised by direct conversion of nitrite to molecular nitrogen, e.g. by using the Anammox process
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- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
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- C02F2101/00—Nature of the contaminant
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- C02F2101/16—Nitrogen compounds, e.g. ammonia
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- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
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Abstract
The invention belongs to the technical field of biological sewage treatment, and relates to a sewage autotrophic nitrogen removal device and a sewage autotrophic nitrogen removal method.A sewage enters a short-cut nitrification anaerobic ammonia oxidation coupling denitrification IFAS reactor, and is firstly subjected to low-oxygen aeration stirring, and ammonia oxidizing bacteria utilize ammonia nitrogen in the inlet water to perform short-cut nitrification reaction under a low-oxygen condition to generate nitrite nitrogen; then stopping aeration, entering an anoxic stirring stage, inhibiting the activity of nitrite oxidizing bacteria by adopting an intermittent aeration mode, and creating conditions for the self-generation of anaerobic ammonium oxidation bacteria; anaerobic ammonia oxidation bacteria which succeed in self-generation carry out anaerobic ammonia oxidation reaction on the residual ammonia nitrogen and nitrite nitrogen in the sewage to generate nitrogen and a small amount of nitrate nitrogen, the residual nitrate nitrogen can be utilized by denitrifying bacteria and generates nitrogen through denitrification reaction, and the deep removal of total nitrogen and organic matters in the system is realized; the anaerobic ammonium oxidation sludge inoculation device is simple in structure, convenient to operate, free of additional carbon source and anaerobic ammonium oxidation sludge inoculation, energy-saving, emission-reducing, economical and efficient.
Description
The technical field is as follows:
the invention belongs to the technical field of biological sewage treatment, and relates to a sewage autotrophic nitrogen removal device and method, in particular to a device and method for autotrophic nitrogen removal of sewage by generating anaerobic ammonium oxidation bacteria and inhibiting enrichment of nitrite oxidizing bacteria.
Background art:
in the biochemical treatment process of urban sewage, a large amount of excess sludge is generated and needs to be subjected to anaerobic digestion treatment, wherein in the anaerobic digestion, organic nitrogen is aminated to synthesize NH4 +-N is transferred to the sludge digest. Sludge digest is typically high NH4 +-N Low C/N Sewage (NH)4 +N concentration may even exceed 800mg/L, C/N ratio is only 0.7-0.8), NH is contained although the treatment amount is small4 +The proportion of the load of-N in the total nitrogen load of the urban sewage can be up to 15-25%. At present, the sludge digestion liquid is directly refluxed into the municipal sewage to be denitrified together with the municipal sewage, so that the C/N of the municipal sewage is further reduced, and the denitrification efficiency is reduced. Therefore, high NH content in the wastewater such as sludge digestive fluid is avoided according to the water quality characteristics of the wastewater4 +The influence of N backflow on mainstream urban sewage treatment is particularly important for researching a novel efficient and economic process.
Compared with the traditional biological denitrification process, the short-cut nitrification anaerobic ammonia oxidation coupling denitrification process can reduce the oxygen supply amount and the aeration energy consumption; the adding of an external carbon source is reduced, and the problem of carbon source shortage in sewage is solved; the output of the excess sludge is low, and the adding amount of the alkalinity is small. In addition, Anaerobic Ammonium Oxidation Bacteria (AAOB) often exist in the form of granular sludge, have large biomass and are suitable for treating high ammonia nitrogen wastewater. The existing synchronous nitrification-anaerobic ammonia oxidation coupling denitrification (SNAD) starting mode is mainly characterized in that after synchronous nitrification-denitrification (SND) is started, anaerobic ammonia oxidation (Anammox) is added: on one hand, the enrichment culture time of AAOB is longer; on the other hand, coupling of SND with Anammox and stable maintenance thereof are difficult. Therefore, a new denitrification method combining the advantages of the SNAD process and the biofilm Anammox reactor and jointly regulating and controlling the anoxic time and the water inlet NH is urgently needed to be searched4 +-N and NO2 -The concentration of N-N can realize the self-generation of AAOB, effectively inhibit the enrichment of Nitrite Oxidizing Bacteria (NOB), provide a new idea for the start and stable operation of SNAD, provide a new way for continuously obtaining Anammox biomembrane, and boost the sewage self-generationThe actual engineering application of nitrogen culture and removal.
The invention content is as follows:
the invention aims to overcome the defects in the prior art, and designs and provides a device and a method for realizing autotrophic nitrogen removal of sewage by self-generating anaerobic ammonium oxidation bacteria and inhibiting enrichment of nitrite oxidizing bacteria, aiming at high NH content4 +The water quality characteristics of the wastewater with-N and low C/N ratio realize the deep autotrophic nitrogen removal, and achieve the aims of solving the problems of insufficient organic carbon source and NH inflow in the traditional biological nitrogen removal process4 +The high content of N affects the performance and the low denitrification efficiency.
In order to achieve the aim, the main structure of the sewage autotrophic nitrogen removal device comprises a water inlet tank, a shortcut nitrification anaerobic ammonia oxidation coupling denitrification IFAS reactor, a water outlet tank and an online monitoring feedback control system; the water inlet tank is connected with the partial nitrification anaerobic ammonia oxidation coupling denitrification IFAS reactor through a water inlet pump; the short-cut nitrification anaerobic ammonia oxidation coupling denitrification IFAS reactor is connected with a water outlet tank through an electric drain valve; the short-cut nitrification anaerobic ammonia oxidation coupling denitrification IFAS reactor is internally provided with a stirring paddle, an air pump, an air flow meter, an aeration head, a sampling port, an electric drainage valve, a pH sensor and a DO sensor, wherein two ends of the air flow meter are respectively connected with the air pump and the aeration head; the on-line monitoring feedback control system comprises a computer and a programmable process controller, wherein a signal converter AD conversion interface, a signal converter DA conversion interface, an aeration relay, a water inlet relay, a stirrer relay, a pH/DO data signal interface and a water outlet relay are arranged in the programmable process controller; the signal AD conversion interface on the programmable process controller is connected with a computer through a cable, and converts the analog signal of the sensor into a digital signal and transmits the digital signal to the computer; the computer is connected with the programmable process controller through a DA conversion interface of the signal converter, and a digital instruction of the computer is transmitted to the programmable process controller; the aeration relay is connected with the electromagnetic valve; the water inlet relay is connected with the water inlet pump; the stirrer relay is connected with the stirrer; the pH/DO data signal interface is connected with a pH/DO tester through a sensor lead; the pH sensor and the DO sensor are respectively connected with a pH/DO tester; the water outlet relay is connected with the electric drain valve.
The treatment process of the sewage in the sewage autotrophic nitrogen removal device comprises the following steps: sewage enters the IFAS reactor from the water inlet tank through the water inlet pump; starting an air pump and adjusting a gas flowmeter to enable the short-cut nitrification anaerobic ammonia oxidation coupling denitrification IFAS reactor to enter a low-oxygen aeration stirring stage; ammonia Oxidizing Bacteria (AOB) utilize NH in the feed water during the hypoxic aerated agitation phase4 +N carries out nitration reaction under the low oxygen condition, and simultaneously realizes the inhibition of Nitrite Oxidizing Bacteria (NOB) by a combined strategy of intermittent aeration and temporary increase of Free Ammonia (FA) concentration, controls the nitration reaction at a nitrite stage and realizes short-cut nitration; during the anoxic phase, Anaerobic Ammonium Oxidizing Bacteria (AAOB) that are self-generated on the packing material utilize NH present in the influent water4 +N and NO produced during the short-cut nitration2 -N and NaNO dosed at the end of the aerobic section2Anaerobic ammonia oxidation occurs, and a small amount of NO is produced3 --N and N2(ii) a Meanwhile, denitrifying bacteria can utilize organic carbon source in the inlet water and a small amount of NO generated in the anaerobic ammonia oxidation process3 --N undergoing a denitrification process to convert NO3 -Conversion of-N to N2The purpose of deep denitrification is achieved; and after one period is finished, settling and draining are carried out, and the discharged water is discharged into a water outlet tank through an electric drain valve.
The invention discloses a method for realizing autotrophic nitrogen removal of sewage, which comprises the following specific steps:
(1) starting the system:
inoculating residual sludge or activated sludge with short-cut nitrification performance from a secondary sedimentation tank of a municipal sewage plant into a short-cut nitrification anaerobic ammonia oxidation coupling denitrification IFAS reactor, so that the concentration of the activated sludge in the inoculated short-cut nitrification anaerobic ammonia oxidation coupling denitrification IFAS reactor reaches 2500 mg/L-3000 mg/L; adding a filling material of a polyethylene ring into a shortcut nitrification-anaerobic ammonia oxidation coupling denitrification IFAS reactor, wherein the volume of the filling material accounts for 3/10-2/5 of the effective volume of the shortcut nitrification-anaerobic ammonia oxidation coupling denitrification IFAS reactor;
2) the run-time adjustments are as follows:
adding the artificially configured simulated digestive juice sewage into a water inlet tank, starting a water inlet pump to pump the sewage into a shortcut nitrification anaerobic ammonia oxidation coupling denitrification IFAS reactor, and feeding NH (ammonia) into the reactor4 +Controlling the concentration of N at 190-200 mg/L, and stirring for 5-8 min under low oxygen; when the low-oxygen stirring is finished, adding additional NaNO into the short-cut nitrification anaerobic ammonia oxidation coupled denitrification denitrogenation IFAS reactor2To make the aerobic powder NO2 -The concentration of N is 25 mg/L-35 mg/L; then stirring for 18-25 min in an anoxic way to promote the attachment growth of Anaerobic Ammonium Oxidation Bacteria (AAOB) on the filling material and finish the denitrification of the sewage; when the running time of the short-cut nitrification anaerobic ammonia oxidation coupled denitrification nitrogen removal IFAS reactor reaches 24-25 h, carrying out precipitation drainage with the drainage ratio of 0.35-0.40, and discharging the effluent into an effluent water tank;
when the short-cut nitrification anaerobic ammonia oxidation coupled denitrification nitrogen removal IFAS reactor runs, the NO in the effluent water3 -Increasing the NH of inlet water when the-N concentration is more than 15mg/L4 +-N concentration of 380 mg/L-400 mg/L, inhibiting activity of Nitrite Oxidizing Bacteria (NOB); in the low-oxygen stirring stage, the concentration of dissolved oxygen in the short-cut nitrification anaerobic ammonia oxidation coupling denitrification nitrogen removal IFAS reactor is 0.7-1.3 mg/L; the temperature in the short-cut nitrification anaerobic ammonia oxidation coupling denitrification IFAS reactor is 25-30 ℃;
when the short-cut nitrification anaerobic ammonia oxidation coupling denitrification IFAS reactor operates, sludge does not need to be discharged, and the concentration of suspended activated sludge in the short-cut nitrification anaerobic ammonia oxidation coupling denitrification IFAS reactor is maintained within the range of 2500 mg/L-3000 mg/L.
Compared with the prior art, the invention has the following advantages: firstly, aiming at the water quality characteristics of high ammonia nitrogen concentration and low C/N ratio of sludge digestive fluid, the shortcut nitrification anaerobic ammonia oxidation technology is applied to the denitrification treatment of the sludge digestive fluid, and simultaneously the denitrification technology is coupled, so that a carbon source is not required to be added, the problem of low denitrification efficiency under the low C/N ratio can be solved, the aeration quantity is saved, and the deep denitrification of sewage is realized; secondly, under the condition that the anammox sludge is not inoculated, the self-generation of anammox bacteria can be realized by enhancing the retentivity and the substrate stimulation, and the anoxic time and the water inlet NH are jointly regulated and controlled4 +-N and NO2 -The concentration of N enhances the activity of anammox; filling materials are added into the IFAS reactor, so that AAOB can be attached to and grow on a self-formed biological membrane, and AOB and denitrifying bacteria mainly grow in a suspension manner, thereby successfully starting the SNAD system and overcoming the problem of difficult coupling of the SND system and Anamox; thirdly, by adopting a combined strategy of intermittent aeration and free ammonia FA improvement, NOB can be effectively inhibited under the condition of no sludge discharge, and the stable operation of the short-cut nitrification reaction is ensured; the device has simple structure and convenient operation, combines the novel biological denitrification technologies such as short-cut nitrification, anaerobic ammonia oxidation, denitrification and the like, and can be used for low C/N ratio and high NH4 +Deep denitrification of N-contaminated water, avoiding high NH concentrations in the water4 +The influence of-N on the performance of a mainstream biological denitrification system is realized by adding a filling material to realize the self-generation of Anammox bacteria and the suspension growth of AOB and denitrifying bacteria, the problems of difficulty in anaerobic ammonia oxidation coupling of synchronous nitrification and denitrification and long AAOB culture time are solved, and the method has the advantages of simplicity in operation, no need of additional carbon source, no need of inoculating anaerobic ammonia oxidation sludge, energy conservation, emission reduction, economy, high efficiency and the like.
Description of the drawings:
FIG. 1 is a schematic diagram of the principle of the main structure of the existing sewage autotrophic nitrogen removal device, wherein 1 is a water inlet tank; 2 is a partial nitrification anaerobic ammonia oxidation coupling denitrification nitrogen removal IFAS reactor; 3 is a water outlet tank; 4, an online monitoring and feedback control system; 2.1 is a water inlet pump; 2.2 is a stirrer; 2.3 is a stirring paddle; 2.4 is an air pump; 2.5 is an electromagnetic valve; 2.6 is a gas flowmeter; 2.7 is an aeration head; 2.8 is a sampling port; 2.9 is an electric drain valve; 2.10 is a pH/DO meter; 2.11 is a pH sensor; 2.12 is a DO sensor; 4.1 is a computer; 4.2 is a programmable process controller; 4.3 is AD conversion interface; 4.4 is DA conversion interface; 4.5 is an aeration relay; 4.6 is a water inlet relay; 4.7 is a stirrer relay; 4.8 is a pH/DO data signal interface; and 4.9 is a water outlet relay.
The specific implementation mode is as follows:
the invention is further described below with reference to the accompanying drawings and examples.
Example (b):
the main structure of the sewage autotrophic nitrogen removal device is shown in fig. 1, and comprises a water inlet tank 1, a partial nitrification anaerobic ammonia oxidation coupled denitrification IFAS reactor 2, a water outlet tank 3 and an online monitoring feedback control system 4; the water inlet tank 1 is connected with the partial nitrification anaerobic ammonia oxidation coupling denitrification IFAS reactor 2 through a water inlet pump 2.1; the short-cut nitrification anaerobic ammonia oxidation coupling denitrification IFAS reactor 2 is connected with the effluent water tank 3 through an electric drain valve 2.9; the short-cut nitrification anaerobic ammonia oxidation coupling denitrification IFAS reactor 2 is internally provided with a stirring paddle 2.3, an air pump 2.4, a gas flowmeter 2.6, an aeration head 2.7, a sampling port 2.8, an electric drain valve 2.9, a pH sensor 2.11 and a DO sensor 2.12, two ends of a gas flow meter 2.6 are respectively connected with a gas pump 2.4 and an aerator 2.7, an electromagnetic valve 2.5 is arranged between the gas pump 2.4 and the gas flow meter 2.6, the aerator 2.7 is arranged at the bottom end inside the short-cut nitrification anaerobic ammonia oxidation coupling denitrification IFAS reactor 2, the top end of a stirring paddle 2.3 is connected with a stirrer 2.2, a pH sensor 2.11 and a DO sensor 2.12 are arranged at the upper end inside the short-cut nitrification anaerobic ammonia oxidation coupling denitrification IFAS reactor 2 and are respectively connected with a pH/DO tester 2.10, and a sampling port 2.8 and an electric drain valve 2.9 are sequentially arranged on the outer side wall of the short-cut nitrification anaerobic ammonia oxidation coupling denitrification IFAS reactor 2 from top to bottom; the on-line monitoring feedback control system 4 comprises a computer 4.1 and a programmable process controller 4.2, wherein a signal converter AD conversion interface 4.3, a signal converter DA conversion interface 4.4, an aeration relay 4.5, a water inlet relay 4.6, a stirrer relay 4.7, a pH/DO data signal interface 4.8 and a water outlet relay 4.9 are arranged in the programmable process controller 4.2; wherein, the signal AD conversion interface 4.3 on the programmable process controller 4.2 is connected with the computer 4.1 through a cable, and converts the analog signal of the sensor into a digital signal and transmits the digital signal to the computer 4.1; the computer 4.1 is connected with the programmable process controller 4.2 through a signal converter DA conversion interface 4.4, and a digital instruction of the computer 4.1 is transmitted to the programmable process controller 4.2; the aeration relay 4.5 is connected with the electromagnetic valve 2.5; the water inlet relay 4.6 is connected with the water inlet pump 2.1; the stirrer relay 4.7 is connected with the stirrer 2.2; the pH/DO data signal interface 4.8 is connected with a pH/DO tester 2.10 through a sensor lead; the pH sensor 2.11 and the DO sensor 2.12 are respectively connected with a pH/DO tester 2.10; the water outlet relay 4.9 is connected with the electric drain valve 2.9.
The process of realizing the autotrophic nitrogen removal of the sewage in the embodiment is as follows:
1) starting the system:
inoculating residual sludge or activated sludge with short-cut nitrification performance from a secondary sedimentation tank of a municipal sewage plant into a short-cut nitrification anaerobic ammonia oxidation coupling denitrification IFAS reactor 2, so that the concentration of the activated sludge in the short-cut nitrification anaerobic ammonia oxidation coupling denitrification IFAS reactor 2 after inoculation reaches 2876 mg/L; adding a filling material of a polyethylene ring into the shortcut nitrification-anaerobic ammonia oxidation coupling denitrification-nitrogen removal IFAS reactor 2, and enabling the volume of the filling material to be 2/5 of the effective volume of the shortcut nitrification-anaerobic ammonia oxidation coupling denitrification-nitrogen removal IFAS reactor 2;
2) the run-time adjustments are as follows:
adding artificially configured simulated digestive juice sewage into a water inlet tank 1, starting a water inlet pump 2.1 to pump the sewage into a shortcut nitrification anaerobic ammonia oxidation coupling denitrification IFAS reactor 2; stirring for 7min under low oxygen, and adding additional NaNO into IFAS reactor 2 when stirring under low oxygen is finished2To make the aerobic powder NO2 -The concentration of N is 28mg/L, so as to increase reaction substrates of AAOB and create conditions for self-generation of AAOB, and realize the attachment growth of AAOB on the filling material; when coming outWater NO3 -Increasing the NH of inlet water when the-N concentration is more than 15mg/L4 +-N concentration, increasing to 400mg/L, inhibits the activity of NOB; in the low-oxygen stirring stage, the dissolved oxygen concentration of the short-cut nitrification anaerobic ammonia oxidation coupled denitrification nitrogen removal IFAS reactor 2 is 1-1.3 mg/L; the short-cut nitrification anaerobic ammonia oxidation coupling denitrification IFAS reactor 2 uses a constant temperature heating rod, the temperature in the reactor is controlled to be about 30 ℃, when the anoxic operation time reaches about 24 hours, precipitation drainage is carried out, the drainage ratio is 0.375, and the effluent is drained into an effluent water tank 3;
when the short-cut nitrification anaerobic ammonia oxidation coupled denitrification IFAS reactor 2 operates, sludge does not need to be discharged, and the concentration of suspended activated sludge in the short-cut nitrification anaerobic ammonia oxidation coupled denitrification IFAS reactor 2 is maintained at about 2500 mg/L.
This embodiment partial nitrification, anaerobic ammonia oxidation coupling denitrification nitrogen removal IFAS reactor 2 adopt organic glass to make, and effective volume is 8L, and the quality of water of artifical configuration simulation digestive juice sewage is as follows: COD concentration is 105-600 mg/L, NH4 +The concentration of-N is 100-400 mg/L, NO2 --N﹤1mg/L，NO3 --N concentration < 1mg/L, MgSO4·7H2O concentration is 0.02mg/L, CaCl2Concentration of 0.01mg/L NaHCO3The concentration is 1g/L, the pH value is 7.3-7.6, after the digestion liquid sewage is subjected to autotrophic denitrification treatment, the COD concentration of the effluent of the partial nitrification anaerobic ammonium oxidation coupled denitrification IFAS reactor 2 is 30-50 mg/L, and NH4 +-N concentration < 2mg/L, NO2 --N concentration < 1mg/L, NO3 -The concentration of-N is less than 12mg/L, and the concentration of TN is less than 15 mg/L.
Claims (2)
1. The utility model provides a sewage autotrophic denitrification device which characterized in that: the main structure of the device comprises a water inlet tank, a shortcut nitrification anaerobic ammonia oxidation coupling denitrification IFAS reactor, a water outlet tank and an online monitoring feedback control system; the water inlet tank is connected with the partial nitrification anaerobic ammonia oxidation coupling denitrification IFAS reactor through a water inlet pump; the short-cut nitrification anaerobic ammonia oxidation coupling denitrification IFAS reactor is connected with a water outlet tank through an electric drain valve; the short-cut nitrification anaerobic ammonia oxidation coupling denitrification IFAS reactor is internally provided with a stirring paddle, an air pump, an air flow meter, an aeration head, a sampling port, an electric drainage valve, a pH sensor and a DO sensor, wherein two ends of the air flow meter are respectively connected with the air pump and the aeration head; the on-line monitoring feedback control system comprises a computer and a programmable process controller, wherein a signal converter AD conversion interface, a signal converter DA conversion interface, an aeration relay, a water inlet relay, a stirrer relay, a pH/DO data signal interface and a water outlet relay are arranged in the programmable process controller; the signal AD conversion interface on the programmable process controller is connected with a computer through a cable, and converts the analog signal of the sensor into a digital signal and transmits the digital signal to the computer; the computer is connected with the programmable process controller through a DA conversion interface of the signal converter, and a digital instruction of the computer is transmitted to the programmable process controller; the aeration relay is connected with the electromagnetic valve; the water inlet relay is connected with the water inlet pump; the stirrer relay is connected with the stirrer; the pH/DO data signal interface is connected with a pH/DO tester through a sensor lead; the pH sensor and the DO sensor are respectively connected with a pH/DO tester; the water outlet relay is connected with the electric drain valve.
2. A method for realizing the autotrophic nitrogen removal of sewage by using the device of claim 1, wherein: the method comprises the following specific steps:
(1) starting the device:
inoculating residual sludge or activated sludge with short-cut nitrification performance from a secondary sedimentation tank of a municipal sewage plant into a short-cut nitrification anaerobic ammonia oxidation coupling denitrification IFAS reactor, so that the concentration of the activated sludge in the inoculated short-cut nitrification anaerobic ammonia oxidation coupling denitrification IFAS reactor reaches 2500 mg/L-3000 mg/L; adding a filling material of a polyethylene ring into a shortcut nitrification-anaerobic ammonia oxidation coupling denitrification IFAS reactor, wherein the volume of the filling material accounts for 3/10-2/5 of the effective volume of the shortcut nitrification-anaerobic ammonia oxidation coupling denitrification IFAS reactor;
2) the run-time adjustments are as follows:
adding the artificially configured simulated digestive juice sewage into a water inlet tank, starting a water inlet pump to pump the sewage into a shortcut nitrification anaerobic ammonia oxidation coupling denitrification IFAS reactor, and feeding NH (ammonia) into the reactor4 +Controlling the concentration of N at 190-200 mg/L, and stirring for 5-8 min under low oxygen; when the low-oxygen stirring is finished, adding additional NaNO into the short-cut nitrification anaerobic ammonia oxidation coupled denitrification denitrogenation IFAS reactor2To make the aerobic powder NO2 -The concentration of N is 25 mg/L-35 mg/L; then stirring for 18-25 min in an anoxic way to promote the attachment growth of Anaerobic Ammonium Oxidation Bacteria (AAOB) on the filling material and finish the denitrification of the sewage; when the running time of the short-cut nitrification anaerobic ammonia oxidation coupled denitrification nitrogen removal IFAS reactor reaches 24-25 h, carrying out precipitation drainage with the drainage ratio of 0.35-0.40, and discharging the effluent into an effluent water tank;
when the short-cut nitrification anaerobic ammonia oxidation coupled denitrification nitrogen removal IFAS reactor runs, the NO in the effluent water3 -Increasing the NH of inlet water when the-N concentration is more than 15mg/L4 +-N concentration of 380 mg/L-400 mg/L, inhibiting activity of Nitrite Oxidizing Bacteria (NOB); in the low-oxygen stirring stage, the concentration of dissolved oxygen in the short-cut nitrification anaerobic ammonia oxidation coupling denitrification nitrogen removal IFAS reactor is 0.7-1.3 mg/L; the temperature in the short-cut nitrification anaerobic ammonia oxidation coupling denitrification IFAS reactor is 25-30 ℃;
when the short-cut nitrification anaerobic ammonia oxidation coupling denitrification IFAS reactor operates, sludge does not need to be discharged, and the concentration of suspended activated sludge in the short-cut nitrification anaerobic ammonia oxidation coupling denitrification IFAS reactor is maintained within the range of 2500 mg/L-3000 mg/L.
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| CN114409071A (en) * | 2022-02-10 | 2022-04-29 | 北京交通大学 | Loading and culturing device and culturing method for ammonia oxidation and anaerobic ammonia oxidation compound bacteria and sewage treatment method |
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| CN115259386A (en) * | 2022-08-19 | 2022-11-01 | 济南大学 | System and method for treating wastewater by using oligodynamic bacteria and algae through completely autotrophic biomembrane |
| CN115594288A (en) * | 2022-09-19 | 2023-01-13 | 北京工业大学（Cn） | Method for realizing synchronous treatment of domestic sewage and nitrate wastewater by SPNAED integrated MBBR by adding hydroxylamine |
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