Sludge treatment system based on anaerobic ammonia oxidation process

Abstract

The utility model relates to a sludge treatment system based on an anaerobic ammonia oxidation process, which is applied to the technical field of sludge treatment and comprises a dilution stirring tank, an anaerobic digestion tank, a micro-aerobic aeration tank and an anaerobic ammonia oxidation tank which are communicated in sequence. When the device is used, ammonia nitrogen and nitrite are directly converted into nitrogen through the anaerobic ammonium oxidation bacteria, the reaction hardly consumes a carbon source on the basis of saving the aeration energy of the nitration reaction, the anaerobic ammonium oxidation bacteria belong to autotrophic microorganisms and grow slowly, and the anaerobic ammonium oxidation bacteria can ensure higher activity, so that the nitrification reaction is more stable, and the nitrification reaction is more stable. The reaction rate of converting ammonia nitrogen and nitrite nitrogen into nitrogen at the same time is increased, so that the wastewater denitrification treatment efficiency is improved, and the denitrification treatment effect is better.

Description

Technical Field

[0001] The present application relates to the technical field of sludge treatment, and in particular to a sludge treatment system based on an anaerobic ammonium oxidation process. Background Art

[0002] In recent years, with the acceleration of China's urbanization and the continuous improvement of its sewage treatment capacity, the amount of sludge generated has increased significantly. This expansion in sewage treatment volume and capacity has led to a year-on-year increase in sludge production. However, despite this continued growth in treatment capacity, the relatively low rate of harmless sludge disposal remains a problem. With increasingly stringent national requirements for environmental protection and pollution control, the volume of sludge disposed of has gradually increased. Harmless and resource-based disposal methods have gradually become key areas of industry development, driving the application and promotion of more efficient and environmentally friendly sludge treatment technologies.

[0003] In the existing technology, sewage sludge treatment will go through the AO process for denitrification and phosphorus removal. Since the AO process requires a carbon source for denitrification and phosphorus removal, the sewage treatment plant does not have enough carbon source and needs to purchase carbon source from outside, which is very inconvenient.

[0004] In view of this, there is an urgent need for a sludge treatment system based on anaerobic ammonium oxidation process to solve the above problems. Summary of the Invention

[0005] In order to help solve the problems existing in the prior art, the present application provides a sludge treatment system based on the anaerobic ammonium oxidation process, which adopts the following technical solution: comprising: a dilution and stirring tank, an anaerobic digester, a micro-aerobic aeration tank and an anaerobic ammonium oxidation tank, wherein the dilution and stirring tank, the anaerobic digester, the micro-aerobic aeration tank and the anaerobic ammonium oxidation tank are connected in sequence;

[0006] The dilution and stirring tank is provided with an agitator for diluting the sludge with dilution water;

[0007] The anaerobic digester is used to perform anaerobic digestion on the diluted sludge;

[0008] The micro-aerobic aeration tank is used to aerate the sludge after anaerobic digestion;

[0009] The anaerobic ammonium oxidation tank is used to remove ammonia nitrogen from the aerated sludge.

[0010] It is further characterized in that

[0011] The dilution stirring tank is connected with a dilution water pipe.

[0012] The dilution and stirring tank is connected with a sludge pipe.

[0013] The anaerobic ammonium oxidation tank is provided with a discharge pipe.

[0014] It also includes an evaporation purification device, wherein the inlet of the evaporation purification device is connected to the discharge pipe.

[0015] The distilled water outlet of the evaporation purification device is connected to the dilution water pipe.

[0016] Fillers are arranged in the anaerobic digestion tank.

[0017] A three-phase separator is provided on the top of the anaerobic digester.

[0018] A submersible mixer is provided in the anaerobic ammonia oxidation tank.

[0019] A membrane bioreactor is arranged in the anaerobic ammonia oxidation tank.

[0020] The above structure of the present application can achieve the following beneficial effects:

[0021] Ammonia nitrogen and nitrite are directly converted into nitrogen gas through anaerobic ammonium oxidizing bacteria. This reaction not only saves aeration energy for nitrification reaction, but also consumes almost no carbon source. Moreover, since anaerobic ammonium oxidizing bacteria are autotrophic microorganisms, they grow slowly, and anaerobic ammonium oxidizing bacteria can ensure high activity to accelerate the reaction rate of converting ammonia nitrogen and nitrite nitrogen into nitrogen gas at the same time, so as to improve the denitrification treatment efficiency of wastewater and achieve better denitrification treatment effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the structure of this application.

[0023] Figure numerals: 1. Dilution stirring tank; 2. Anaerobic digester; 3. Micro-aerobic aeration tank; 4. Anaerobic ammonia oxidation tank; 5. Dilution water pipe; 6. Sludge pipe; 7. Discharge pipe; 8. Evaporation purification device; 9. Three-phase separator; 10. Submersible mixer; 11. Membrane bioreactor. DETAILED DESCRIPTION

[0024] In order to enable those skilled in the art to better understand the present invention, the following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts should fall within the scope of protection of this application.

[0025] It should be noted that the terms "including" and "having" and any variations thereof in the specification and claims of this application and the above-mentioned drawings are intended to cover non-exclusive inclusions. For example, a process, method, apparatus, product or equipment that includes a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or are inherent to these processes, methods, products or equipment.

[0026] The following is combined with Figure 1 The utility model is described in further detail.

[0027] Reference Figure 1 , a sludge treatment system based on anaerobic ammonium oxidation process, comprising: a dilution stirring tank 1, an anaerobic digestion tank 2, a microaerobic aeration tank 3 and an anaerobic ammonium oxidation tank 4, the dilution stirring tank 1, the anaerobic digestion tank 2, the microaerobic aeration tank 3 and the anaerobic ammonium oxidation tank 4 are connected in sequence; a stirrer is provided in the dilution stirring tank 1 for diluting the sludge with dilution water; the anaerobic digestion tank 2 is used for anaerobic digestion of the diluted sludge; the microaerobic aeration tank 3 is used for aerating the sludge after anaerobic digestion; the anaerobic ammonium oxidation tank 4 is used for removing ammonia nitrogen from the aerated sludge, a dilution water pipe 5 is connected to the dilution stirring tank 1, a sludge pipe 6 is connected to the dilution stirring tank 1, and the anaerobic ammonium oxidation tank 4 is provided with a discharge pipe 7; municipal sludge with a water content of 80% is pumped into the dilution stirring tank 1; recycled water is added to the dilution stirring tank 1 to dilute and stir the sludge, and the sludge is diluted to a mud-water mixture with a solid content of 5%; The sludge-water mixture with a rate of 5% enters the anaerobic digester 2 for anaerobic digestion, breaking down large molecules into small molecules; the biogas slurry after anaerobic digestion is subjected to micro-aerobic aeration, and the dissolved oxygen content in the micro-aerobic zone is further accurately controlled at about 2 mg / L to avoid excessive nitrification in the aerobic zone, which leads to unnecessary loss of carbon source, and nitrification is carried out. After micro-aerobic aeration, it enters the anaerobic ammonium oxidation tank. In the anaerobic ammonium oxidation tank 4, ammonia nitrogen is used as an electron donor and nitrite is used as an electron acceptor. Anaerobic ammonium oxidizing bacteria directly convert ammonia nitrogen and nitrite into nitrogen (N2). This reaction not only saves the aeration energy of the nitrification reaction, but also consumes almost no carbon source. Moreover, since anaerobic ammonium oxidizing bacteria are autotrophic microorganisms, they grow slowly, and anaerobic ammonium oxidizing bacteria can ensure high activity to accelerate the reaction rate of simultaneously converting ammonia nitrogen and nitrite nitrogen into nitrogen, so as to improve the efficiency of wastewater denitrification treatment and make the denitrification treatment effect better.

[0028] Further optimization is, Figure 1As shown, the system also includes an evaporation purification device 8, the inlet of the evaporation purification device 8 is connected to the discharge pipe 7, and the distilled water outlet of the evaporation purification device 8 is connected to the dilution water pipe 5. The evaporation purification device 8 evaporates and concentrates the effluent filtrate after being treated by the anaerobic ammonia oxidation tank 4 to increase the COD (chemical oxygen demand) to about 200,000 mg / L. The evaporated condensed water returns to the stirring dilution tank 1 to dilute the sludge, thereby realizing water recycling.

[0029] A further optimization is that fillers are provided in the anaerobic digester 2. Thus, fillers are added in the anaerobic digester 2 to promote the enrichment of specific microbial communities and to enrich and form biofilms on the filler carriers, thereby improving the decomposition efficiency.

[0030] Further optimization is, Figure 1 As shown, a three-phase separator 9 is provided on the top of the anaerobic digester 2 . By arranging the three-phase separator 9 on the top of the anaerobic digester 2 , mud and water are separated, and the separated biogas slurry enters the micro-aerobic aeration tank 3 .

[0031] Further optimization is, Figure 1 As shown, a submersible mixer 10 is provided in the anaerobic ammonium oxidation tank 4. The submersible mixer 10 is added to the anaerobic ammonium oxidation tank 4, and the mixing efficiency is improved by the submersible mixer 10, thereby accelerating the anaerobic ammonium oxidation reaction.

[0032] Further optimization is, Figure 1 As shown, a membrane bioreactor 11 is provided in the anaerobic ammonia oxidation tank 4. By providing the membrane bioreactor 11 in the anaerobic ammonia oxidation tank 4, the anaerobic ammonia oxidation bacteria in the anaerobic ammonia oxidation tank 4 are retained, so that the effluent is clear and no secondary precipitation is required. In addition, the denitrified biogas slurry is separated from the muddy water by using the membrane bioreactor 11, and the effluent is purified to obtain a high-quality carbon source.

[0033] In summary, anaerobic ammonia-oxidizing bacteria directly convert ammonia nitrogen and nitrite into nitrogen (N2). This reaction not only saves the aeration energy of the nitrification reaction, but also consumes almost no carbon source. Moreover, since anaerobic ammonia-oxidizing bacteria are autotrophic microorganisms, they grow slowly, and anaerobic ammonia-oxidizing bacteria can ensure high activity to accelerate the reaction rate of simultaneously converting ammonia nitrogen and nitrite nitrogen into nitrogen, so as to improve the efficiency of wastewater denitrification treatment and make the denitrification treatment effect better. No carbon source needs to be added during the process, avoiding the situation of insufficient carbon source and the need to purchase.

[0034] Anaerobic digestion of sludge results in the disintegration of sludge flocs, rupture of cell walls, and dissolution of EPS, releasing more organic matter and generating significant amounts of ammonia nitrogen. Therefore, the biogas slurry after hydrolysis must be denitrified and discharged into an anaerobic ammonium oxidation (ANAMOX) tank. Anaerobic ammonium oxidation (ANAMOX) is a process that generates nitrogen gas and subsequently removes nitrogen under anaerobic or anoxic conditions. It offers advantages such as high denitrification efficiency, zero secondary pollution, and no exposure to air.

[0035] This specific embodiment is merely an explanation of the present invention and is not intended to limit the present invention. After reading this specification, those skilled in the art may make non-creative modifications to this embodiment as needed. However, as long as such modifications are within the scope of the claims of the present invention, they are protected by patent law.

Claims

1. A sludge treatment system based on anaerobic ammonium oxidation process, characterized in that: include: a dilution stirring tank (1), an anaerobic digestion tank (2), a microaerobic aeration tank (3), and an anaerobic ammonium oxidation tank (4), wherein the dilution stirring tank (1), the anaerobic digestion tank (2), the microaerobic aeration tank (3), and the anaerobic ammonium oxidation tank (4) are connected in sequence; The dilution and stirring tank (1) is provided with an agitator for diluting the sludge with dilution water; The anaerobic digestion tank (2) is used to perform anaerobic digestion on the diluted sludge; The micro-aerobic aeration tank (3) is used to aerate the sludge after anaerobic digestion; The anaerobic ammonium oxidation tank (4) is used to remove ammonia nitrogen from the aerated sludge.

2. The sludge treatment system based on the anaerobic ammonium oxidation process according to claim 1, characterized in that: The dilution stirring tank (1) is connected to a dilution water pipe (5).

3. A sludge treatment system based on anaerobic ammonium oxidation process according to claim 2, characterized in that: The dilution stirring tank (1) is connected to a sludge pipe (6).

4. The sludge treatment system based on the anaerobic ammonium oxidation process according to claim 2, characterized in that: The anaerobic ammonium oxidation tank (4) is provided with a discharge pipe (7).

5. The sludge treatment system based on the anaerobic ammonium oxidation process according to claim 4, characterized in that: It also includes an evaporation purification device (8), the inlet of the evaporation purification device (8) is connected to the discharge pipe (7).

6. The sludge treatment system based on the anaerobic ammonium oxidation process according to claim 5, characterized in that: The distilled water outlet of the evaporation purification device (8) is connected to the dilution water pipe (5).

7. The sludge treatment system based on the anaerobic ammonium oxidation process according to claim 1, characterized in that: Fillers are provided in the anaerobic digestion tank (2).

8. The sludge treatment system based on anaerobic ammonium oxidation process according to claim 1, characterized in that: A three-phase separator (9) is provided on the top of the anaerobic digestion tank (2).

9. The sludge treatment system based on anaerobic ammonium oxidation process according to claim 1, characterized in that: A submersible mixer (10) is provided in the anaerobic ammonia oxidation tank (4).

10. The sludge treatment system based on anaerobic ammonium oxidation process according to claim 1, characterized in that: A membrane bioreactor (11) is provided in the anaerobic ammonia oxidation tank (4).

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