CN113371820A - Nitrogen and phosphorus removal device and method by coupling iron-carbon microelectrolysis with endogenous denitrification/anaerobic ammonia oxidation - Google Patents
Nitrogen and phosphorus removal device and method by coupling iron-carbon microelectrolysis with endogenous denitrification/anaerobic ammonia oxidation Download PDFInfo
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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
- C02F3/005—Combined electrochemical biological processes
-
- 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
- C02F1/46—Treatment of water, waste water, or sewage by electrochemical methods
- C02F1/461—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis
- C02F1/46104—Devices therefor; Their operating or servicing
- C02F1/46176—Galvanic cells
-
- 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
- C02F3/30—Aerobic and anaerobic processes
- C02F3/302—Nitrification and denitrification treatment
-
- 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
- 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
-
- 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
- C02F3/30—Aerobic and anaerobic processes
- C02F3/308—Biological phosphorus removal
-
- 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
- C02F3/34—Biological treatment of water, waste water, or sewage characterised by the microorganisms used
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/02—Temperature
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/06—Controlling or monitoring parameters in water treatment pH
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/22—O2
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/38—Gas flow rate
Abstract
The invention discloses a nitrogen and phosphorus removal device and method based on iron-carbon microelectrolysis coupling endogenous denitrification/anaerobic ammonia oxidation. The method adopts an iron-carbon microelectrolysis technology coupled with an anaerobic ammonia oxidation process to treat the municipal sewage, realizes synchronous nitrogen and phosphorus removal, and simultaneously takes the zero-valent iron in the iron-carbon raw material and ferrous ions generated by the reaction of a primary battery as an electron donor to reduce nitrate nitrogen to generate nitrogen so as to effectively participate in the nitrogen conversion process. Meanwhile, iron ions can be combined with negatively charged microbial cells through electrostatic neutralization to promote the formation of microbial aggregates, so that the granulation process of the anaerobic ammonia oxidation sludge is accelerated. The iron-carbon microelectrolysis dephosphorization process absorbs dissolved oxygen in the wastewater, and creates an anaerobic environment for an endogenous denitrification/anaerobic ammonia oxidation process.
Description
Technical Field
The application belongs to the technical field of biological sewage treatment, and particularly relates to a nitrogen and phosphorus removal device and method with iron-carbon micro-electrolysis coupling endogenous denitrification/anaerobic ammonia oxidation.
Background
The discharge of phosphate is one of the main factors of water eutrophication. At present, the removal of phosphate still has a big problem in sewage treatment, and the phosphorus removal at the present stage mostly adopts treatment technologies such as a biological method, a chemical precipitation method, an adsorption method and the like. The biological phosphorus removal has high requirements on temperature, carbon source, sludge age and the like, and needs a certain operation, maintenance and management level; the chemical precipitation method for removing phosphorus needs to add a large amount of medicament and can generate more sludge; the phosphorus removal by the adsorption method adopts a specific adsorbent, the adsorption is easy to saturate, and regeneration is needed. Compared with the traditional phosphorus removal technology, the iron-carbon microelectrolysis phosphorus removal technology has the advantages of simple process, low cost, good treatment effect, convenience in operation and maintenance, low power consumption, safety in biological and environmental effects and the like, and is a novel and friendly water body phosphorus removal technology.
The basic principle of phosphorus removal by the iron-carbon microelectrolysis technology is that electrochemical corrosion occurs, waste water is used as electrolyte, and iron (Fe) and carbon (Fe) are treated3C) Numerous tiny primary cells are formed between the primary cells, and a large amount of Fe is generated in the process2+And Fe3+On one hand, the complex can form insoluble salt with phosphate radical, on the other hand, the complex can be hydrolyzed to generate a polynuclear hydroxyl complex with a longer linear structure, and the colloid is condensed to remove the phosphate radical precipitate through the actions of electric neutralization, adsorption bridging and sweeping. At the same time, the galvanic reaction also produces a large amount of free hydrogen [ H ] with enhanced chemical activity]And O, the carbon chains of a plurality of organic pollutants can be destroyed, and the organic matters which are difficult to degrade are reduced into the organic matters which are easy to degrade, so that the biodegradability of the wastewater is improved.
The anaerobic ammonium oxidation process is used as a novel biological denitrification process and uses CO2As a carbon source, it is considered to be an effective means for realizing low-consumption denitrification of municipal sewage without involving dissolved oxygen and organic matters. However, from the viewpoint of metabolic mechanism, the maximum theoretical denitrification rate of the anaerobic ammonia oxidation reaction is only 89%, so that coupled denitrification is often needed to solve the problem of effluent NO3 -The problem of accumulation. And because the C/N ratio of the actual urban sewage is often low, the C/N ratio may not be enough to meet the carbon source and the required amount required by denitrificationAnd the carbon source is externally supplemented, so that the treatment cost is increased, and organic residues and additives are easily generated. And because the actual urban sewage quality and water quantity fluctuation change is large, the organic matter components are relatively complex, when the concentration of organic matters in the environment is too high or fluctuates, the competition of denitrifying bacteria and anaerobic ammonium oxidation bacteria on a substrate and a living space becomes more intense, and the problems of system instability and effluent quality deterioration are easy to occur.
Disclosure of Invention
The application aims to provide a nitrogen and phosphorus removal device and method for iron-carbon microelectrolysis coupling endogenous denitrification/anaerobic ammonia oxidation, wherein an iron-carbon microelectrolysis phosphorus removal method and an endogenous denitrification/anaerobic ammonia oxidation nitrogen removal method are coupled for achieving the purpose of synchronous nitrogen and phosphorus removal of municipal sewage.
In order to achieve the purpose, the technical scheme adopted by the application is as follows:
the utility model provides a nitrogen and phosphorus removal device of endogenous denitrification of little electrolysis coupling of iron carbon/anammox, nitrogen and phosphorus removal device of endogenous denitrification of little electrolysis coupling of iron carbon/anammox includes: former water tank, little electrolysis coupling anaerobic ammonium oxidation reactor of iron carbon, dephosphorization remove organic matter goes out water tank, short distance nitration reactor, short distance nitration water tank, wherein:
the iron-carbon micro-electrolysis coupling anaerobic ammonia oxidation reactor is connected with a raw water tank through an iron-carbon micro-electrolysis coupling anaerobic ammonia oxidation reactor water inlet pump, is used for injecting urban sewage raw water into an iron-carbon micro-electrolysis coupling anaerobic ammonia oxidation reactor from a raw water tank, the iron-carbon micro-electrolysis coupling anaerobic ammonia oxidation reactor is connected with the water outlet tank for removing phosphorus and organic matters by adopting a water outlet valve I, is used for discharging the water outlet of phosphorus removal and organic matter removal into a water outlet tank of phosphorus removal and organic matter removal, an iron shaving filler bearing plate and a bearing block are arranged in the iron-carbon micro-electrolysis coupling anaerobic ammonia oxidation reactor, four bearing blocks which are symmetrical to each other are arranged above a water inlet which is connected with a water inlet pump of the iron-carbon micro-electrolysis coupling anaerobic ammonia oxidation reactor, the iron shaving filler bearing plate is arranged on the four bearing blocks, and the iron shaving filler is fixed on the iron shaving filler bearing plate by lead wires;
the short-cut nitrification reactor is connected with the phosphorus and organic matter removing water outlet tank through a short-cut nitrification reactor water inlet pump and used for discharging phosphorus and organic matter removing water in the phosphorus and organic matter removing water outlet tank into the short-cut nitrification reactor, the short-cut nitrification reactor adopts a short-cut nitrification reactor water outlet valve to be connected with the short-cut nitrification water outlet tank and used for discharging short-cut nitrification liquid after short-cut nitrification reaction into the short-cut nitrification water outlet tank, the iron-carbon microelectrolysis coupling anaerobic ammonia oxidation reactor is connected with the short-cut nitrification water outlet tank through a short-cut nitrification liquid water inlet pump and used for injecting the short-cut nitrification liquid in the short-cut nitrification water outlet tank into the iron-carbon microelectrolysis coupling anaerobic ammonia oxidation reactor, and the short-cut nitrification liquid is subjected to deep denitrification through the anaerobic ammonia oxidation reaction and finally flows out through an iron-carbon microelectrolysis coupling anaerobic ammonia oxidation reactor water outlet valve II.
Several alternatives are provided below, but not as an additional limitation to the above general solution, but merely as a further addition or preference, each alternative being combinable individually for the above general solution or among several alternatives without technical or logical contradictions.
Preferably, the raw water tank is provided with a first water inlet pipe, a first emptying pipe and a first overflow pipe;
a third water inlet pipe, a third emptying pipe and a third overflow pipe are arranged on the water outlet tank for removing phosphorus and organic matters;
and a fifth water inlet pipe, a fifth emptying pipe and a fifth overflow pipe are arranged on the short-cut nitrification water outlet tank.
Preferably, a stirring device I, a pH sensing probe I and a heating rod I are arranged inside the iron-carbon microelectrolysis coupling anaerobic ammonia oxidation reactor, the pH sensing probe I is connected to a pH tester outside the iron-carbon microelectrolysis coupling anaerobic ammonia oxidation reactor, and the heating rod I is connected to a temperature controller I outside the iron-carbon microelectrolysis coupling anaerobic ammonia oxidation reactor;
and a second overflow pipe, a second emptying pipe, the water outlet valve I and the water outlet valve II are arranged on the wall of the iron-carbon microelectrolysis coupling anaerobic ammonia oxidation reactor.
Preferably, a stirring device II, a pH sensing probe II, a DO sensing probe and a heating rod II are arranged in the short-cut nitrification reactor, the pH sensing probe II and the DO sensing probe are connected with a pH and DO determinator outside the short-cut nitrification reactor, and the heating rod II is connected with a temperature controller II outside the short-cut nitrification reactor;
the bottom of the short-cut nitrification reactor is provided with a micropore aeration head, the micropore aeration head is connected to a gas flow meter outside the short-cut nitrification reactor, and the gas flow meter is connected with an aeration pump;
and a fourth overflow pipe, a fourth emptying pipe and the water outlet valve of the short-cut nitrification reactor are arranged on the wall of the short-cut nitrification reactor.
The application also provides a nitrogen and phosphorus removal method of iron-carbon microelectrolysis coupling endogenous denitrification/anaerobic ammonia oxidation, and the nitrogen and phosphorus removal method of iron-carbon microelectrolysis coupling endogenous denitrification/anaerobic ammonia oxidation comprises the following steps:
1) and (3) inoculation starting stage: inoculating anaerobic ammonium oxidation granular sludge which is successfully cultured in a laboratory into an iron-carbon micro-electrolysis coupling anaerobic ammonium oxidation reactor, wherein the sludge concentration is controlled to be 2000-3000 mg/L; inoculating the shortcut nitrification sludge successfully cultured in a laboratory into a shortcut nitrification reactor, wherein the sludge concentration is controlled to be 3000-4000 mg/L;
2) and (3) actual operation stage: starting an iron-carbon microelectrolysis coupling anaerobic ammonia oxidation reactor water inlet pump to inject urban sewage raw water in a raw water tank into the iron-carbon microelectrolysis coupling anaerobic ammonia oxidation reactor, uniformly mixing the urban sewage raw water with anaerobic ammonia oxidation granular sludge and fully contacting and reacting with iron shaving filler, carrying out closed anaerobic stirring for 2.0-3.0 h, then precipitating for 20-30 min, and discharging dephosphorization and organic matter removal effluent into a dephosphorization and organic matter removal effluent water tank through an effluent valve I of the iron-carbon microelectrolysis coupling anaerobic ammonia oxidation reactor, wherein the drainage ratio is 60-70%; starting a water inlet pump of the short-cut nitrification reactor to inject the water with the functions of removing phosphorus and organic matters from a water tank with the functions of removing phosphorus and organic matters into the short-cut nitrification reactor, firstly stirring for 30-60 min in an anoxic way, and then adding the NO remained in the short-cut nitrification reactor in the upper period2 -Sufficiently denitrifying N, aerating for 2.0-2.5 h, controlling the concentration of dissolved oxygen to be 0.5-1.0 mg/L, precipitating for 30-40 min, and discharging the short-cut nitrified liquid into a short-cut nitrified water outlet tank through a water outlet valve of the short-cut nitrified reactor, wherein the water discharge ratio is 60-70%; and starting a short-cut nitrification liquid water inlet pump to inject short-cut nitrification liquid from a short-cut nitrification water outlet water tank into the iron-carbon micro-electrolysis coupling anaerobic ammonia oxidation reactor again, firstly carrying out closed anoxic stirring for 2.0-3.0 h, then carrying out precipitation for 20-30 min, and finally discharging the effluent through an effluent valve II of the iron-carbon micro-electrolysis coupling anaerobic ammonia oxidation reactor, wherein the water discharge ratio is 60-70%.
Preferably, in the step 2), at the stage that the shortcut nitrification liquid is injected into the iron-carbon microelectrolysis coupling anaerobic ammonia oxidation reactor again from the shortcut nitrification effluent water tank by the shortcut nitrification liquid inlet pump, the NO in the iron-carbon microelectrolysis coupling anaerobic ammonia oxidation reactor is subjected to microelectrolysis coupling by controlling the running time of the shortcut nitrification liquid inlet pump2 --N/NH4 +The concentration ratio of-N is controlled to be 1.0-1.5.
Preferably, the iron shaving filler in the step 2) is periodically subjected to acid washing to remove surface deposits so as to recover the dephosphorization effect, and during the period that the iron-carbon microelectrolysis coupling anaerobic ammonia oxidation reactor stops operating, the iron shaving filler bearing plate and the iron shaving filler are taken out, the iron shaving filler is soaked in 10% diluted hydrochloric acid for 3min, and then washed with clean water for 3 times so as to remove the surface deposits.
Preferably, the iron shaving filler in the step 2) is derived from cutting waste of iron products in a machining factory.
Compared with the prior art, the device and the method for removing nitrogen and phosphorus by iron-carbon micro-electrolysis coupling endogenous denitrification/anaerobic ammonia oxidation have the following beneficial effects:
(1) the phosphorus is removed by adopting an iron-carbon micro-electrolysis technology, the principle is based on a primary battery, no external power supply is needed, waste iron shavings are used as an iron-carbon material and are taken from industrial waste, and the phosphorus removing method has the characteristics of treating waste with waste, being environment-friendly, saving energy and reducing consumption.
(2) The anaerobic ammonia oxidation process not only can utilize zero-valent iron in the iron-carbon raw material and ferrous ions generated by the reaction of a primary battery as an electron donor to reduce nitrate nitrogen to generate nitrogen by coupling an iron-carbon micro-electrolysis technology, but also can effectively improve the denitrification efficiency, and the iron ions and the ferrous ions are generated in the phosphorus removal process of the iron-carbon micro-electrolysis technology, thereby providing a more favorable environment for the growth and metabolism of anaerobic ammonia oxidizing bacteria.
(3) Fe produced in the process of dephosphorization by using iron-carbon micro-electrolysis technology2+And Fe3+The iron ions are beneficial to the synthesis of heme in cells of the anaerobic ammonia oxidizing bacteria, promote the synthesis of various functional proteins, enhance energy metabolism and enable the structure and the form of the flora to be more stable.
(4) Iron ions can be combined with negatively charged microbial cells through electrostatic neutralization to promote the formation of microbial aggregates, so that the granulation process of the anaerobic ammonia oxidation sludge is accelerated.
(5) The iron-carbon microelectrolysis dephosphorization process absorbs dissolved oxygen in the wastewater, and creates an anaerobic environment for an endogenous denitrification/anaerobic ammonia oxidation process, so that the denitrification efficiency is improved.
(6) Because the iron shavings are arranged in the anaerobic ammonia oxidation reactor and the particularity of the endogenous denitrification/anaerobic ammonia oxidation process is combined, the urban sewage is subjected to secondary phosphorus removal in the anaerobic ammonia oxidation reactor, the stage of converting an external carbon source into an internal carbon source is the first time, the stage of anaerobic ammonia oxidation reaction is the second time, and the secondary phosphorus removal greatly improves the phosphorus removal efficiency.
(7) The double-sludge system provides aerobic and anaerobic environments for the shortcut nitrifying bacteria and the anaerobic ammonium oxidation bacteria respectively, thereby being beneficial to realizing the maximization of the efficiency of the functional bacteria respectively and ensuring the stable and deep denitrification of the system.
(8) Endogenous denitrifying polysaccharide bacteria can internalize exogenous organic matters, so that inhibition of the activity of anaerobic ammonium oxidation bacteria by the organic matters is avoided, the impact load resistance of a system is improved, nitrate can be used as an electron donor to be removed through denitrification reaction, and the problem of accumulation of nitrate in effluent of anaerobic ammonium oxidation reaction is solved.
Drawings
Fig. 1 is a schematic structural diagram of a nitrogen and phosphorus removal device with iron-carbon microelectrolysis coupling endogenous denitrification/anaerobic ammonia oxidation.
The reference numerals in the drawings are explained below: 1. a raw water tank; 2. an iron-carbon microelectrolysis coupling anaerobic ammonia oxidation reactor; 3. a water outlet tank for removing phosphorus and organic matters; 4. a short-cut nitrification reactor; 5. a short-cut nitrification water outlet tank; 1.1, a first water inlet pipe; 1.2, a first emptying pipe; 1.3, a first overflow pipe; 2.1, coupling an iron-carbon micro-electrolysis water inlet pump of an anaerobic ammonia oxidation reactor; 2.2, a stirring device I; 2.3, a second overflow pipe; 2.4, a second emptying pipe; 2.5, a pH sensing probe I; 2.6, heating a rod I; 2.7, a pH tester; 2.8, a temperature controller I; 2.9, a water outlet valve I; 2.10, a water outlet valve II; 2.11, iron shaving filler; 2.12, an iron shaving filler bearing plate; 2.13, a bearing block; 3.1, a third water inlet pipe; 3.2, a third emptying pipe; 3.3, a third overflow pipe; 4.1, a short-cut nitrifying liquid inlet pump; 4.2, a water inlet pump of the short-cut nitrification reactor; 4.3, a stirring device II; 4.4, a pH sensing probe II; 4.5, DO sensing probe; 4.6, heating a rod II; 4.7, pH and DO meter; 4.8, a temperature controller II; 4.9, a fourth emptying pipe; 4.10, a fourth overflow pipe; 4.11, an aeration pump; 4.12, a gas flow meter; 4.13, a microporous aeration head; 4.14, a water outlet valve of the short-cut nitrification reactor; 5.1, a fifth water inlet pipe; 5.2, a fifth emptying pipe; 5.3 and a fifth overflow pipe.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of 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 application.
It is noted that when an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present; when an element is referred to as being "secured" to another element, it can be directly secured to the other element or intervening elements may also be present.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in the description of the present application herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.
Example 1
The embodiment provides a nitrogen and phosphorus removal device with iron-carbon microelectrolysis coupled with endogenous denitrification/anaerobic ammonia oxidation, which is used for realizing synchronous nitrogen and phosphorus removal of municipal sewage.
As shown in fig. 1, the nitrogen and phosphorus removal device with iron-carbon microelectrolysis coupling for endogenous denitrification/anaerobic ammonia oxidation of the embodiment includes a raw water tank 1, an iron-carbon microelectrolysis coupling anaerobic ammonia oxidation reactor 2, a water tank 3 for removing phosphorus and organic substances, a short-cut nitrification reactor 4, and a short-cut nitrification water tank 5.
Specifically, an iron-carbon microelectrolysis coupling anaerobic ammonia oxidation reactor 2 is connected with a raw water tank 1 through an iron-carbon microelectrolysis coupling anaerobic ammonia oxidation reactor water inlet pump 2.1, is used for injecting raw water of urban sewage into an iron-carbon micro-electrolysis coupling anaerobic ammonia oxidation reactor 2 from a raw water tank 1, the iron-carbon micro-electrolysis coupling anaerobic ammonia oxidation reactor 2 is connected with a water outlet tank 3 for removing phosphorus and organic matters by a water outlet valve I2.9, is used for discharging the water outlet of phosphorus removal and organic matter removal into a water outlet tank 3 of phosphorus removal and organic matter removal, an iron shaving filler 2.11, an iron shaving filler bearing plate 2.12 and a bearing block 2.13 are arranged in the iron-carbon micro-electrolysis coupling anaerobic ammonia oxidation reactor 2, four bearing blocks 2.13 which are symmetrical to each other are arranged above a water inlet which is connected with a water inlet pump 2.1 of the iron-carbon micro-electrolysis coupling anaerobic ammonia oxidation reactor, an iron shaving filler bearing plate 2.12 is arranged on the four bearing blocks 2.13, and an iron shaving filler 2.11 is fixed on the iron shaving filler bearing plate 2.13 by lead wires.
The short-cut nitrification reactor 4 is connected with the water outlet tank 3 for removing phosphorus and organic matters through a short-cut nitrification reactor water inlet pump 4.2, is used for injecting the water from the water tank 3 for removing phosphorus and organic substances into the short-cut nitrification reactor 4, the short-cut nitrification reactor 4 is connected with a short-cut nitrification effluent water tank 5 by adopting a short-cut nitrification reactor effluent valve 4.14, used for discharging the shortcut nitrification liquid after the shortcut nitrification reaction into a shortcut nitrification effluent water tank 5, the iron-carbon micro-electrolysis coupling anaerobic ammonia oxidation reactor 2 is connected with the shortcut nitrification effluent water tank 5 through a shortcut nitrification liquid inlet pump 4.1, is used for injecting the short-cut nitrified liquid in the short-cut nitrified water outlet tank 5 into the iron-carbon micro-electrolysis coupling anaerobic ammonia oxidation reactor 2, after the short-cut nitrified liquid is deeply denitrified by anaerobic ammonia oxidation reaction, and finally, water is discharged through a water outlet valve II 2.10 of the iron-carbon micro-electrolysis coupling anaerobic ammonia oxidation reactor 2.
The application adopts the iron-carbon microelectrolysis technology coupled with the anaerobic ammonia oxidation technology to treat the municipal sewage, realizes synchronous nitrogen and phosphorus removal, and simultaneously takes the zero-valent iron in the iron-carbon raw material and ferrous ions generated by the reaction of the primary battery as an electron donor to reduce nitrate nitrogen to generate nitrogen, thereby effectively participating in the nitrogen conversion process. Meanwhile, iron ions can be combined with negatively charged microbial cells through electrostatic neutralization to promote the formation of microbial aggregates, so that the granulation process of the anaerobic ammonia oxidation sludge is accelerated. The iron-carbon microelectrolysis dephosphorization process absorbs dissolved oxygen in the wastewater, and creates an anaerobic environment for an endogenous denitrification/anaerobic ammonia oxidation process.
In order to further realize stable deep denitrification of the municipal sewage, the method that the anaerobic ammonia oxidation process is coupled with the endogenous denitrification is adopted, nitrate nitrogen is removed by utilizing a carbon source in the municipal sewage through denitrification, and the endogenous denitrifying polysaccharide bacteria can internalize exogenous organic matters, so that the inhibition of the organic matters on the activity of the anaerobic ammonia oxidation bacteria is avoided, and the impact load resistance of the system is also improved. Therefore, the endogenous denitrification can be better applied to the deep denitrification of the actual urban sewage with large fluctuation change of water quality and complex organic matter components.
Therefore, the application couples the iron-carbon micro-electrolysis technology with the endogenous denitrification/anaerobic ammonia oxidation technology to synchronously denitrify and dephosphorize the municipal sewage.
The iron shaving phosphorus removal unit is simple in operation, "treat wastes with wastes" is designed to combine trace iron element to be beneficial to the growth and metabolism of anammox bacteria, has a remarkable promoting effect on nitrosation reaction, and is favorable for accelerating the granulation process of anammox sludge, and coupling iron-carbon microelectrolysis and anammox synchronous nitrogen and phosphorus removal, so that stable and efficient nitrogen and phosphorus removal is ensured, and physical, chemical and biological cooperative treatment of sewage is realized.
This application two sludge system provides good oxygen and anaerobic environment respectively for short distance nitrobacteria and anaerobic ammonium oxidation fungus, is favorable to realizing functional bacteria efficiency maximize separately, and the endogenous denitrification of coupling denitrification glycan fungus has ensured that whole denitrification system stable performance when handling actual municipal sewage, and the denitrogenation is effectual, and the energy consumption is low.
It should be noted that the raw water tank 1, the water outlet tank 3 for removing phosphorus and organic substances, and the short-cut nitrification water outlet tank 5 in this embodiment all guide water through water pipes. For example, the iron-carbon microelectrolysis coupling anaerobic ammonia oxidation reactor 2 mentioned in the application is connected with the phosphorus and organic matter removing water outlet tank 3 by using the water outlet valve i 2.9, and it is understood that the water outlet valve i 2.9 on the iron-carbon microelectrolysis coupling anaerobic ammonia oxidation reactor 2 is connected with the phosphorus and organic matter removing water outlet tank 3 by using a water pipe, and the water pipe penetrates through the shell of the phosphorus and organic matter removing water outlet tank 3 and goes deep into the interior, so that the phosphorus and organic matter removing water of the iron-carbon microelectrolysis coupling anaerobic ammonia oxidation reactor 2 is guided into the phosphorus and organic matter removing water outlet tank 3, and the rest is the same.
In order to further improve the convenience of the device, in another embodiment, the raw water tank 1 is provided with a first water inlet pipe 1.1, a first emptying pipe 1.2 and a first overflow pipe 1.3; a third water inlet pipe 3.1, a third emptying pipe 3.2 and a third overflow pipe 3.3 are arranged on the water outlet tank 3 for removing phosphorus and organic matters; the short-cut nitrification water outlet tank 5 is provided with a fifth water inlet pipe 5.1, a fifth emptying pipe 5.2 and a fifth overflow pipe 5.3.
The water inlet pipe is used for injecting water into the water tank, the emptying pipe is used for emptying the water tank, and the overflow pipe is used for balancing pressure and discharging redundant liquid in the water tank.
In order to facilitate control of conditions of iron-carbon microelectrolysis and endogenous denitrification/anammox, in another embodiment, a stirring device I2.2, a pH sensing probe I2.5 and a heating rod I2.6 are arranged inside the iron-carbon microelectrolysis coupling anammox reactor 2, wherein the pH sensing probe I2.5 is connected to a pH tester 2.7 outside the iron-carbon microelectrolysis coupling anammox reactor 2, and the heating rod I2.6 is connected to a temperature controller I2.8 outside the iron-carbon microelectrolysis coupling anammox reactor 2; and a second overflow pipe 2.3, a second emptying pipe 2.4, a water outlet valve I2.9 and a water outlet valve II 2.10 are arranged on the wall of the iron-carbon micro-electrolysis coupling anaerobic ammonia oxidation reactor 2.
A stirring device II 4.3, a pH sensing probe II 4.4, a DO sensing probe 4.5 and a heating rod II 4.6 are arranged in the shortcut nitrification reactor 4, the pH sensing probe II 4.4 and the DO sensing probe 4.5 are connected with a pH and DO determinator 4.7 outside the shortcut nitrification reactor 4, and the heating rod II 4.6 is connected with a temperature controller II 4.8 outside the shortcut nitrification reactor 4; the bottom of the short-cut nitrification reactor 4 is provided with a microporous aerator 4.13, the microporous aerator 4.13 is connected to a gas flow meter 4.12 outside the short-cut nitrification reactor 4, and the gas flow meter 4.12 is connected with an aeration pump 4.11; the wall of the short-cut nitrification reactor 4 is provided with a fourth overflow pipe 4.10, a fourth emptying pipe 4.9 and a water outlet valve 4.14 of the short-cut nitrification reactor.
The reactor provided by the embodiment has more accurate control on conditions, is stable in operation, and is easy to realize the synchronous nitrogen and phosphorus removal of the municipal sewage.
Example 2
The embodiment provides a nitrogen and phosphorus removal method based on any one of the devices in any one of the embodiments.
Specifically, the nitrogen and phosphorus removal method by coupling iron-carbon microelectrolysis with endogenous denitrification/anaerobic ammonia oxidation comprises the following steps:
1) and (3) inoculation starting stage: inoculating anaerobic ammonium oxidation granular sludge successfully cultured in a laboratory into an iron-carbon micro-electrolysis coupling anaerobic ammonium oxidation reactor 2, wherein the sludge concentration is controlled to be 2000-3000 mg/L; inoculating the short-cut nitrification sludge successfully cultured in a laboratory into the short-cut nitrification reactor 4, wherein the sludge concentration is controlled to be 3000-4000 mg/L;
2) and (3) actual operation stage: the method comprises the steps of taking urban sewage raw water as a treatment object, starting an iron-carbon microelectrolysis coupling anaerobic ammonia oxidation reactor water inlet pump 2.1 to inject the urban sewage raw water in a raw water tank 1 into an iron-carbon microelectrolysis coupling anaerobic ammonia oxidation reactor 2, uniformly mixing the urban sewage raw water with anaerobic ammonia oxidation granular sludge and fully contacting and reacting with an iron shaving filler 2.11 to achieve the effects of secondary phosphorus removal and contribution to the growth of Anamax bacteria, stirring for 2.0-3.0 hours in a closed anaerobic mode, then precipitating for 20-30 min, and discharging phosphorus and organic matter removing effluent into a phosphorus and organic matter removing effluent water tank 3 through an effluent valve I2.9 of the iron-carbon microelectrolysis coupling anaerobic ammonia oxidation reactor 2, wherein the water discharge ratio is 60-70%.
Starting a water inlet pump 4.2 of the short-cut nitrification reactor to inject the water with the phosphorus and organic matter removed from a water tank 3 of the phosphorus and organic matter removed water into the short-cut nitrification reactor 4, carrying out anoxic stirring for 30-60 min, then carrying out aeration for 2.0-2.5 h, controlling the concentration of dissolved oxygen to be 0.5-1.0 mg/L, then precipitating for 30-40 min, and then discharging the short-cut nitrification liquid into a water tank 5 of the short-cut nitrification water outlet through a water outlet valve 4.14 of the short-cut nitrification reactor, wherein the water discharge ratio is 60-70%; starting a short-cut nitrification liquid inlet pump 4.1, injecting short-cut nitrification liquid from a short-cut nitrification effluent water tank 5 into the iron-carbon micro-electrolysis coupling anaerobic ammonia oxidation reactor 2 again, carrying out closed anoxic stirring for 2.0-3.0 h, then precipitating for 20-30 min, and finally discharging effluent through a water outlet valve II 2.10 of the iron-carbon micro-electrolysis coupling anaerobic ammonia oxidation reactor 2, wherein the water discharge ratio is 60-70%.
The denitrification method of the embodiment is that denitrifying polysaccharide bacteria and anaerobic ammonium oxidation bacteria are combined into the same reactor, firstly, denitrifying polysaccharide bacteria are utilized to convert exogenous carbon in raw water of municipal sewage into an internal carbon source to be stored in a cell body, and after anaerobic carbon accumulation is finished, the exogenous carbon is injected into a short-cut nitrification reactor to carry out short-cut nitrification reaction, so that the urban sewage is rich in NO2 -The partial nitrification of the N to produce water, the ammonia nitrogen and the nitrite are mainly converted into nitrogen and a small amount of nitrate through anaerobic ammonia oxidation reaction, and a part of the nitrite and the nitrate can be converted into the N through endogenous denitrification reaction2Thereby realizing the purpose of deep nitrogen and phosphorus removal of the municipal sewage.
In order to accurately control NO in the iron-carbon micro-electrolysis coupling anaerobic ammonia oxidation reactor 22 --N/NH4 +-N ratio, in one embodiment, in short range nitroThe stage of injecting the shortcut nitrification liquid from the shortcut nitrification water outlet tank 5 into the iron-carbon micro-electrolysis coupling anaerobic ammonia oxidation reactor 2 by the chemical liquid inlet pump 4.1 is that NO in the iron-carbon micro-electrolysis coupling anaerobic ammonia oxidation reactor 2 is injected by controlling the running time of the shortcut nitrification liquid inlet pump 4.12 --N/NH4 +The concentration ratio of-N is controlled to be 1.0-1.5.
The phosphorus removal method of the embodiment is to utilize iron wood shavings and municipal sewage to carry out iron-carbon micro-electrolysis reaction and utilize a large amount of Fe generated by primary battery reaction2+And Fe3+Form insoluble salt with phosphate radical or remove phosphate radical precipitate by the condensation of its hydrolytic colloid. Therefore, the precipitates generated in the electrolytic process are easy to accumulate on the surfaces of the iron filings, so that the surfaces of the iron filings are passivated, and the treatment effect is influenced.
In order to maintain efficient phosphorus removal effect for a long time, the restoration of the phosphorus removal effect of the iron shavings is required. In another embodiment, the iron shaving filler 2.11 needs to be periodically pickled to remove surface deposits so as to recover the dephosphorization effect, the detachable iron shaving filler bearing plate 2.12 with the iron shaving filler 2.11 is taken out during the stop operation of the iron-carbon microelectrolysis coupling anaerobic ammonia oxidation reactor 2, the iron shaving filler is soaked in 10% dilute hydrochloric acid for 3min and then washed with clean water for 3 times so as to remove the surface deposits; the frequency of pickling is determined by the change in the surface deposits of the iron shaving filler, for example, every five days.
In the present embodiment, both the anammox sludge and the shortcut nitrification sludge in step 1) are obtained from laboratory culture, and may be purchased from the market.
Step 2) of this example the iron shaving filler was derived from machining scrap from a machining plant.
The following examples further illustrate the beneficial effects of the present application.
Test examples
In the embodiment, the effluent of a primary sedimentation tank of a Hangzhou sewage treatment plant is used as the raw water of urban sewage, and the specific water quality is as follows: the COD concentration is 192.3 +/-22.8 mg/L,
the concentration is 51.2 +/-4.5 mg/L,
concentration of 0.4 + -0.2 mg/L, NO-3The concentration of-N is 0.6 plus or minus 0.4mg/L, the concentration of TN is 57.8 plus or minus 4.9mg/L, and the concentration of TP is 5.7 plus or minus 0.8 mg/L.
The test is carried out on the basis of the synchronous nitrogen and phosphorus removal device for the iron-carbon micro-electrolysis coupling endogenous denitrification/anaerobic ammonia oxidation process, wherein the effective volume of a raw water tank 1 is 50L, the effective volumes of an iron-carbon micro-electrolysis coupling anaerobic ammonia oxidation reactor 2 and a short-cut nitrification reactor 4 are 6L, the effective volumes of a phosphorus removal and organic matter effluent water tank 3 and a short-cut nitrification effluent water tank 5 are 25L, and the water tanks and the reactors are made of organic glass; 2.11 iron shavings filling 2.11 iron shavings 1503.6g, the filling volume is 2102.9cm3Has a low bulk density of only 715kg/m during filling3。
The operation mode comprises the following steps:
(1) opening a water inlet pump 2.1 of an iron-carbon microelectrolysis coupling anaerobic ammonia oxidation system to inject 3.6L of municipal sewage into an iron-carbon microelectrolysis coupling anaerobic ammonia oxidation reactor 2 from a raw water tank 1, mixing the inlet water, then carrying out anaerobic stirring for 2.0h, carrying out sufficient anaerobic carbon polymerization reaction, precipitating for 45min to separate sludge and water, discharging the supernatant of the effluent into a water tank 3 of dephosphorization and organic matter effluent, wherein the drainage ratio is 60 percent, and the COD concentration of the effluent is 75.4 +/-12.9 mg/L,
the concentration is 30.7 plus or minus 4.5mg/L, the concentration of TN is 34.7 plus or minus 5.0mg/L, and the concentration of TP is 1.9 plus or minus 0.3 mg/L.
(2) Opening a water inlet pump 4.2 of the short-cut nitrification system, injecting 3.6L of dephosphorization and organic matter effluent into the short-cut nitrification reactor 4, stirring for 30min under oxygen deficiency, aerating for 1.5h, controlling DO concentration at the aeration stage to be 0.5-1.0 mg/L, precipitating for 30min after the aeration is finished, discharging the short-cut nitrification effluent into a short-cut nitrification effluent water tank 5, controlling the water discharge ratio to be 60%, controlling the COD concentration of the short-cut nitrification effluent to be 32.5 +/-9.4 mg/L,
the concentration is 0.6 plus or minus 0.3mg/L,
the concentration is 16.5 +/-3.2 mg/L, and the concentration of TN is 19.2 +/-2.9 mg/L.
(4) Opening a short-cut nitrifying liquid inlet pump 4.1, injecting 3.6L of short-cut nitrifying liquid into the iron-carbon micro-electrolysis coupling anaerobic ammonia oxidation reactor 2 again, stirring for 2.0h in the absence of oxygen, carrying out anaerobic ammonia oxidation reaction and denitrification reaction, precipitating for 15min, and discharging the discharged water, wherein the water discharge ratio is 60%. The COD concentration of the effluent is 33.2 plus or minus 4.7mg/L,
the concentration is 0.6 plus or minus 0.8mg/L, the TN concentration is 2.3 plus or minus 0.6mg/L, the TP concentration is 0.3 plus or minus 0.2mg/L, and the total iron concentration is 0.8 plus or minus 0.5 mg/L.
The continuous operation results show that: when the process is used for treating actual urban sewage, the COD concentration of the effluent can be obtained<40mg/L，
Concentration of<1.5mg/L, TN concentration<3mg/L, TP concentration<0.5mg/L, the total iron concentration is less than 1.5mg/L, the removal rate of TN is more than 90%, and the removal rate of TP is more than 90%.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (8)
1. The nitrogen and phosphorus removal device with iron-carbon microelectrolysis coupling endogenous denitrification/anaerobic ammonia oxidation is characterized by comprising: former water tank (1), little electrolytic coupling anaerobic ammonium oxidation reactor of iron carbon (2), dephosphorization remove organic matter play water tank (3), short distance nitration reactor (4), short distance nitration play water tank (5), wherein:
the iron-carbon microelectrolysis coupling anaerobic ammonia oxidation reactor (2) is connected with a raw water tank (1) through an iron-carbon microelectrolysis coupling anaerobic ammonia oxidation reactor water inlet pump (2.1) and used for injecting urban sewage raw water into the iron-carbon microelectrolysis coupling anaerobic ammonia oxidation reactor (2) from the raw water tank (1), the iron-carbon microelectrolysis coupling anaerobic ammonia oxidation reactor (2) is connected with a phosphorus and organic matter removing water outlet tank (3) through a water outlet valve I (2.9) and used for discharging phosphorus and organic matter removing water into a phosphorus and organic matter removing water outlet tank (3), an iron shaving filler (2.11), an iron shaving filler bearing plate (2.12) and a bearing block (2.13) are arranged inside the iron-carbon microelectrolysis coupling anaerobic ammonia oxidation reactor (2), four bearing blocks (2.13) which are symmetrical to each other are arranged above a water inlet connected with the iron-carbon microelectrolysis coupling anaerobic ammonia oxidation reactor water inlet pump (2.1), the iron shaving filler bearing plate (2.12) is arranged on the four bearing blocks (2.13), and the iron shaving filler (2.11) is fixed on the iron shaving filler bearing plate (2.13) by lead wires;
the short-cut nitrification reactor (4) is connected with the phosphorus and organic matter removing water outlet tank (3) through a short-cut nitrification reactor water inlet pump (4.2) and is used for injecting phosphorus and organic matter removing water in the phosphorus and organic matter removing water outlet tank (3) into the short-cut nitrification reactor (4), the short-cut nitrification reactor (4) is connected with the short-cut nitrification water outlet tank (5) through a short-cut nitrification reactor water outlet valve (4.14) and is used for discharging short-cut nitrification liquid after short-cut nitrification reaction into the short-cut nitrification water outlet tank (5), the iron-carbon micro-electrolysis coupling anaerobic ammonia oxidation reactor (2) is connected with the short-cut nitrification water outlet tank (5) through a short-cut nitrification liquid inlet pump (4.1) and is used for injecting the short-cut nitrification liquid in the short-cut nitrification water outlet tank (5) into the iron-carbon micro-electrolysis coupling anaerobic ammonia oxidation reactor (2), and the short-cut nitrification liquid is subjected to deep denitrification through the anaerobic ammonia oxidation reaction, finally, water is discharged through a water outlet valve II (2.10) of the iron-carbon micro-electrolysis coupling anaerobic ammonia oxidation reactor (2).
2. The nitrogen and phosphorus removal device with iron-carbon microelectrolysis coupling for endogenous denitrification/anaerobic ammonia oxidation according to claim 1, wherein a first water inlet pipe (1.1), a first emptying pipe (1.2) and a first overflow pipe (1.3) are arranged on the raw water tank (1);
a third water inlet pipe (3.1), a third emptying pipe (3.2) and a third overflow pipe (3.3) are arranged on the phosphorus and organic matter removing water outlet tank (3);
and a fifth water inlet pipe (5.1), a fifth emptying pipe (5.2) and a fifth overflow pipe (5.3) are arranged on the short-cut nitrification water outlet tank (5).
3. The device for removing nitrogen and phosphorus through iron-carbon microelectrolysis coupling endogenous denitrification/anaerobic ammonia oxidation according to claim 1, wherein a stirring device I (2.2), a pH sensing probe I (2.5) and a heating rod I (2.6) are arranged inside the iron-carbon microelectrolysis coupling anaerobic ammonia oxidation reactor (2), the pH sensing probe I (2.5) is connected to a pH measuring instrument (2.7) outside the iron-carbon microelectrolysis coupling anaerobic ammonia oxidation reactor (2), and the heating rod I (2.6) is connected to a temperature controller I (2.8) outside the iron-carbon microelectrolysis coupling anaerobic ammonia oxidation reactor (2);
and a second overflow pipe (2.3), a second emptying pipe (2.4), the water outlet valve I (2.9) and the water outlet valve II (2.10) are arranged on the wall of the iron-carbon microelectrolysis coupling anaerobic ammonia oxidation reactor (2).
4. The device for removing nitrogen and phosphorus by internal denitrification/anaerobic ammonia oxidation through microelectrolysis coupling of iron and carbon as claimed in claim 1, wherein a stirring device II (4.3), a pH sensing probe II (4.4), a DO sensing probe (4.5) and a heating rod II (4.6) are arranged inside the shortcut nitrification reactor (4), the pH sensing probe II (4.4) and the DO sensing probe (4.5) are connected to a pH and DO determinator (4.7) outside the shortcut nitrification reactor (4), and the heating rod II (4.6) is connected to a temperature controller II (4.8) outside the shortcut nitrification reactor (4);
a micropore aeration head (4.13) is arranged at the bottom of the short-cut nitrification reactor (4), the micropore aeration head (4.13) is connected to a gas flow meter (4.12) outside the short-cut nitrification reactor (4), and the gas flow meter (4.12) is connected with an aeration pump (4.11);
and a fourth overflow pipe (4.10), a fourth emptying pipe (4.9) and a water outlet valve (4.14) of the short-cut nitrification reactor are arranged on the wall of the short-cut nitrification reactor (4).
5. The method for removing nitrogen and phosphorus by iron-carbon microelectrolysis coupling endogenous denitrification/anaerobic ammonia oxidation based on the device of claim 1 is characterized by comprising the following steps of:
1) and (3) inoculation starting stage: inoculating anaerobic ammonium oxidation granular sludge which is successfully cultured in a laboratory into an iron-carbon micro-electrolysis coupling anaerobic ammonium oxidation reactor (2), wherein the sludge concentration is controlled to be 2000-3000 mg/L; inoculating the short-cut nitrified sludge successfully cultured in a laboratory into the short-cut nitrifying reactor (4), wherein the sludge concentration is controlled to be 3000-4000 mg/L;
2) and (3) actual operation stage: the method comprises the steps of taking municipal sewage raw water as a treatment object, starting an iron-carbon microelectrolysis coupling anaerobic ammonia oxidation reactor water inlet pump (2.1), injecting the municipal sewage raw water in a raw water tank (1) into the iron-carbon microelectrolysis coupling anaerobic ammonia oxidation reactor (2), uniformly mixing the municipal sewage raw water with anaerobic ammonia oxidation granular sludge, fully contacting and reacting with iron shaving fillers (2.11), carrying out closed anaerobic stirring for 2.0-3.0 h, then precipitating for 20-30 min, and discharging dephosphorization and organic matter removal effluent into a dephosphorization and organic matter removal effluent water tank (3) through an effluent valve I (2.9) of the iron-carbon microelectrolysis coupling anaerobic ammonia oxidation reactor (2), wherein the water discharge ratio is 60-70%; starting a water inlet pump (4.2) of the short-cut nitrification reactor to inject the water for removing phosphorus and organic matters from a water tank (3) for removing phosphorus and organic matters into the short-cut nitrification reactor (4), firstly stirring for 30-60 min in an anoxic way, and then periodically adding residual NO in the short-cut nitrification reactor (4)2 -Fully denitrifying the N, aerating for 2.0-2.5 h, controlling the concentration of dissolved oxygen to be 0.5-1.0 mg/L, precipitating for 30-40 min, and discharging the short-cut nitrified liquid into a short-cut nitrified liquid through a short-cut nitrifying reactor water outlet valve (4.14)A process nitrification effluent water tank (5) with a water discharge ratio of 60-70%; starting a short-cut nitrification liquid inlet pump (4.1), injecting short-cut nitrification liquid from a short-cut nitrification water outlet tank (5) into the iron-carbon micro-electrolysis coupling anaerobic ammonia oxidation reactor (2) again, carrying out closed anoxic stirring for 2.0-3.0 h, then precipitating for 20-30 min, and finally discharging the effluent through a water outlet valve II (2.10) of the iron-carbon micro-electrolysis coupling anaerobic ammonia oxidation reactor (2), wherein the water discharge ratio is 60-70%.
6. The method for removing nitrogen and phosphorus by iron-carbon microelectrolysis coupling endogenous denitrification/anaerobic ammonia oxidation according to claim 5, wherein in the step 2), at the stage that the shortcut nitrification liquid is injected into the iron-carbon microelectrolysis coupling anaerobic ammonia oxidation reactor (2) again from the shortcut nitrification effluent water tank (5) by the shortcut nitrification liquid inlet pump (4.1), the NO in the iron-carbon microelectrolysis coupling anaerobic ammonia oxidation reactor (2) is removed by controlling the running time of the shortcut nitrification liquid inlet pump (4.1)2 --N/NH4 +The concentration ratio of-N is controlled to be 1.0-1.5.
7. The method for removing nitrogen and phosphorus by internal denitrification/anaerobic ammonium oxidation through microelectrolysis coupling of iron and carbon as claimed in claim 5, wherein the iron shaving filler (2.11) in the step 2) is periodically subjected to acid washing to remove surface deposits so as to recover the phosphorus removal effect, and during the period that the iron and carbon microelectrolysis coupling anaerobic ammonium oxidation reactor (2) stops operating, the iron shaving filler supporting plate (2.12) and the iron shaving filler (2.11) are taken out, the iron shaving filler (2.11) is soaked in 10% dilute hydrochloric acid for 3min, and then washed with clear water for 3 times so as to remove the surface deposits.
8. The method for removing nitrogen and phosphorus by internal denitrification/anaerobic ammonia oxidation through iron-carbon microelectrolysis coupling according to claim 5, wherein the iron shaving filler (2.11) in the step 2) is derived from cutting waste of ironwork in a mechanical processing plant.
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| CN114772729A (en) * | 2022-04-15 | 2022-07-22 | 同济大学 | Method for enhanced denitrification of sewage |
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