Improved A 3 Improved A 3 Improved A 3 Improved A 3 Improved A 3 Improved A <000000

Abstract

The application relates to the technical field of sewage treatment, in particular to an improved A 3 / O+MBBR domestic sewage treatment device and a use method thereof. The treatment device comprises MBBR reactors which are arranged in the aerobic zone at intervals, the MBBR reactors comprise a cylinder body which is internally provided with suspended filler and has a surface opening, a flat plate type aerator is communicated with an aeration pipeline and can make the suspended filler in the cylinder body in a fluidized state; a carrier frame carrying a catalyst is fixed in the pre-denitration zone, the metal active component in the catalyst is composed of Pd and Cu, and the nitrification liquid in the aerobic zone is partially output to the pre-denitration zone. The application solves the problems of low denitration efficiency, poor suspended effect of the filler and high energy consumption in the prior art, and has the advantages of high denitration efficiency, good suspended effect of the filler and low energy consumption.

Description

TECHNICAL FIELD

[0001] The present application relates to sewage treatment technical field, especially to an improved A 3 / O+MBBR domestic sewage treatment device and using method thereof. BACKGROUND

[0002] A 3 / O+MBBR domestic sewage treatment system and process are the processes of strengthening biological denitrification and phosphorus removal in recent years, that is, a first-stage anoxic tank, namely a pre-denitrification tank, is added in front of the traditional A 2 / O process, forming a process combination of pre-denitrification tank-anaerobic tank-anoxic tank-oxygen tank, and MBBR suspended filler is generally added in the oxygen tank, and microorganisms grow on the filler, which belongs to a moving bed biofilm reactor. Because the density of the filler is close to water, the filler is in a complete mixing state with water during aeration.

[0003] A 3 / O+MBBR treatment process is stable and reliable in operation, has strong impact load resistance, has good denitrification effect, and is an economic and efficient sewage treatment process. However, the process also has the following disadvantages:

[0004] (1) The pre-denitrification zone only removes nitrate nitrogen in the backflow sludge lifted by the sludge pump of the sedimentation tank, and the nitrogen removal effect is limited, and the system denitrification efficiency is only 50% to 70%;

[0005] (2) Because the filler is arranged in the oxygen zone and needs to be in a suspended state, more aeration equipment needs to be arranged, so that the energy consumption is high, and the suspension effect of the filler is poor in actual operation;

[0006] (3) In order to intercept the filler and prevent the filler from being lost, a screen is generally arranged on the water surface to intercept the filler, which leads to a complex device and also hinders the arrangement of other equipment in the oxygen zone. SUMMARY

[0007] The present application provides an improved A 3 / O+MBBR domestic sewage treatment device and using method thereof to achieve the purpose of high denitrification efficiency, low energy consumption and simplified structure compared with the prior art.

[0008] To achieve the above purpose, the present application adopts the following technical solutions:

[0009] An improved A 3The / O+MBBR domestic sewage treatment device comprises a pre-denitrification zone, an anaerobic zone, an anoxic zone, an aerobic zone and a sedimentation zone which are sequentially connected, part of activated sludge in the sedimentation zone is returned to the pre-denitrification zone and the anaerobic zone, the aerobic zone is provided with suspended filler and part of nitrification liquid in the aerobic zone is output to the anoxic zone, and material in a reducing agent solution tank is output to the pre-denitrification zone.

[0010] A. MBBR reactors are arranged in the aerobic zone at intervals along the transmission direction of the sewage, the MBBR reactors comprise a cylinder body, the suspended filler is arranged in the cylinder body, a flat plate aerator is in communication with an aeration pipeline at the bottom of the aerobic zone and can make the suspended filler in the cylinder body in a fluidized state, and the cylinder body is provided with openings in communication with the inside of the cylinder body;

[0011] B. A catalyst supporting frame is fixed in the pre-denitrification zone, a carrier is fixed on the catalyst supporting frame, and a catalyst for chemical catalytic reduction denitrification is carried on the carrier, the metal active component in the catalyst is composed of Pd and Cu, and the mass fraction ratio of Pd to Cu is Pd: Cu = 1-1.5: 1-1.5; and part of the nitrification liquid in the aerobic zone is output to the pre-denitrification zone.

[0012] Improved A 3 The use method of the / O+MBBR domestic sewage treatment device comprises the following steps:

[0013] a. The sewage enters the pre-denitrification zone, part of the activated sludge in the sedimentation zone is returned to the pre-denitrification zone, and part of the nitrification liquid in the aerobic zone is returned to the pre-denitrification zone;

[0014] b. The reducing agent is added to the pre-denitrification zone from the reducing agent solution tank, the returned sludge input from the sedimentation zone and part of the nitrification liquid input from the aerobic zone perform chemical catalytic reduction denitrification reaction under the action of the reducing agent and the catalyst, and biological denitrification reaction under the action of the activated sludge;

[0015] c. The sewage generated in the pre-denitrification zone and part of the activated sludge generated in the sedimentation zone are returned to the anaerobic zone to perform anaerobic phosphorus release and degradation of organic matter;

[0016] d. The sewage generated in the anaerobic zone and the nitrification liquid generated in the aerobic zone are output to the anoxic zone to perform biological denitrification and degradation of organic matter;

[0017] e. The sewage generated in the anoxic zone enters the MBBR reactor in the aerobic zone, the organic matter is fully degraded, the nitrogen in the sewage is subjected to nitrification reaction to form nitrate nitrogen, and the polyphosphorus bacteria perform aerobic phosphorus absorption reaction;

[0018] f. The effluent in the aerobic zone enters the sedimentation zone for sludge-water separation, part of the activated sludge generated is returned to the pre-denitrification zone and the anaerobic zone, and the rest is discharged as residual sludge.

[0019] In order to facilitate the full reaction in the aerobic zone and avoid material short circuit operation, the preferred technical implementation means is that the water inlet end of the aerobic zone is communicated with the water inlet end of the sedimentation zone through a zigzag flow channel, and the MBBR reactor is arranged in the zigzag flow channel. In order to facilitate the material flow, the preferred technical implementation means is that the zigzag flow channel is provided with a submersible propeller at intervals.

[0020] The opening is a long circle arranged along the axial direction and the radial direction of the cylinder.

[0021] In order to facilitate the fixation of the cylinder, the preferred technical implementation means is that the bottom of the cylinder is fixed with the bottom of the aerobic zone through a support.

[0022] In order to facilitate the disassembly and maintenance, the preferred technical implementation means is that the cylinder is in a sectional structure connected through flanges.

[0023] In order to meet the catalytic effect and facilitate the mounting of the catalyst on the carrier, the preferred technical implementation means is that the carrier is a macroporous polystyrene resin, the specific surface area of the carrier is 400m 2 / g~600m 2 / g, the pore volume is 0.4m 3 / g~2.Om 3 / g, and the pore size is 3.0nm~5.0nm.

[0024] In order to facilitate the installation of the carrier, the preferred technical implementation means is that the carrier is fixed with the catalyst carrier frame through a suspension rod.

[0025] In order to facilitate the installation of the catalyst carrier frame, the preferred technical implementation means is that the catalyst carrier frame is connected with the pool wall of the pre-denitration zone through a guide rail. In this way, the catalyst carrier frame and the inner wall of the pre-denitration zone can be assembled through plug-in cooperation.

[0026] The catalyst carrier frame can adopt a frame structure of various structural forms to meet the need of structural strength and facilitate the mounting of the catalyst, and the preferred technical implementation means is that the catalyst carrier frame adopts a frame structure composed of a ring frame rod, a horizontal transverse rod, a horizontal longitudinal rod and a vertical connecting rod.

[0027] The material output of the reducing agent solution tank is connected with the pre-denitration zone through a dosing pump, and the reducing agent is formic acid or sodium formate.

[0028] Part of the activated sludge formed in the sedimentation zone is returned to the pre-denitration zone and the anaerobic zone through a sludge discharge pump.

[0029] The nitrification liquid generated in the aerobic zone is output to the anoxic zone through a nitrification liquid return pump.

[0030] In order to verify the effect of the present application, the applicant carried out the following test:

[0031] Denitrification removal rate test

[0032] 1. Test time: August 20, 2023;

[0033] 2. Test site: Hebei Tianda Environmental Research Institute Co., Ltd.;

[0034] 3. Test personnel: Jiang Pengfei, Fu Shixiang;

[0035] 4. Test basis: "Determination of Nitrate Nitrogen in Water by Ultraviolet Spectrophotometry" (HJ / T 346-2007), "Determination of Ammonia Nitrogen in Water by Nessler's Reagent Spectrophotometry" (HJ 535-2009), "Determination of Nitrite Nitrogen in Water by Spectrophotometry" (GB 7493-87);

[0036] 5. Test process: The treated wastewater is artificial simulated domestic wastewater, the nitrate nitrogen is 529 mg / L, and the main process operation conditions are: formic acid dosage 6.5 g / L, reaction temperature 25℃, mass percentage of active components of catalyst Pd-Cu: Pd 1%~1.5%, Cu 1%~1.5%; carrier macroporous polystyrene resin specific surface area 400 m 2 / g~600 m 2 / g, pore volume 0.4 m 3 / g~2.0 m 3 / g; pH=4.2, reaction time 2 hours, DO dissolved oxygen 0.5-1 mg / L;

[0037] 6. Test results: After the reaction, the nitrate nitrogen is 63.48 mg / L, the ammonia nitrogen is 12 mg / L, the nitrate removal rate is 88%, and the nitrogen selectivity is 90%.

[0038] In the description of the present application, the terms "axial", "radial", "bottom", "input", "output" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, which is only for the convenience of simplifying the description of the present application, and does not indicate or imply that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. The terms "first", "second" are only used for description and cannot be understood as implying importance.

[0039] The substantial features possessed by the present application and the significant technical progress achieved are:

[0040] 1. The application sets a carrying frame with catalyst in the pre-denitrification zone, which combines chemical catalytic reduction method with biological denitrification to achieve higher denitrification efficiency. According to the applicant's test, the nitrate removal rate is 88%, and the nitrogen selectivity reaches 90% by using the device and method of the application. Compared with the existing technology, the denitrification efficiency is greatly improved from 50% to 70%. The macroporous polystyrene resin is used as the catalyst carrier, which can effectively ensure the carrying capacity of the catalyst and meet the smooth progress of the reaction. At the same time, the carrying frame structure is stable, which is beneficial to the stable operation of the process.

[0041] 2. The application adopts a zigzag flow channel + improved MBBR filler arrangement form in the aerobic zone, which combines activated sludge method and biofilm method to improve the biochemical treatment efficiency. The MBBR reactor is arranged at the water flow cross section and adopts a zigzag flow channel, which can prevent the short circuit flow of water in the aerobic zone, prolong the reaction path and improve the reaction effect.

[0042] 3. The application sets the suspended filler in the cylinder, and the lower part is provided with a flat plate aerator, so that the filler in the cylinder is in a fluidized state. Compared with the prior art, it has the advantages of lower energy consumption and easier suspension of the filler. The interception device is omitted, the equipment is simplified, and the investment is effectively reduced. BRIEF DESCRIPTION OF DRAWINGS

[0043] The drawings of the application are:

[0044] Figure 1 It is a structure schematic view of the domestic sewage treatment system with a pre-denitrification zone of the application.

[0045] Figure 2 It is Figure 1 the F view of the catalyst carrying frame in

[0046] Figure 3 It is Figure 1 the K view of the aerobic zone in

[0047] Figure 4 It is a structure schematic view of the MBBR reactor in the domestic sewage treatment system of the application.

[0048] Figure 5 It is a structure schematic view of the catalyst carrier plate in the domestic sewage treatment system of the application.

[0049] Figure 6 It is a process flow chart of the domestic sewage treatment process in the application.

[0050] The reference signs in the drawings are as follows:

[0051] 1, reducing agent solution tank; 2, dosing pump; 3, nitration liquid reflux pump; 4, sludge pump; 5, Roots blower; 6, mixer; 7A, first disc aerator; 7B, second disc aerator; 7C, third disc aerator; 8, MBBR reactor; 8A, cylinder; 8B, suspended filler; 8C, flange; 8D, flat plate aerator; 8E, support; 8F, long round hole; 9, submersible propeller; 10, catalyst carrier frame; 10A, ring frame rod; 10B, vertical connecting rod; 10C, suspension rod; 10D, guide rail; 10E, horizontal transverse rod; 10F, horizontal longitudinal rod; 10G, carrier; 11A, first reflux pipeline; 11B, second reflux pipeline; 12A, first nitration liquid reflux pipeline; 12B, second nitration liquid reflux pipeline; 13, aeration pipeline; 14, dosing pipeline. DETAILED DESCRIPTION

[0052] The accompanying drawings illustrate embodiments of the present application, and together with the description given below, further serve to describe the embodiments of the present application. It is to be understood that the present application is not limited to the embodiments described and shown, and any equivalent technical means substitution made according to the specification shall not be deemed to be out of the scope of the present application.

[0053] EMBODIMENT

[0054] IMPROVED A 3 The improved A / O+MBBR domestic sewage treatment device comprises a pre-denitration zone, an anaerobic zone, an anoxic zone, an aerobic zone and a sedimentation zone which are sequentially connected, the pre-denitration zone is provided with a first disc aerator 7A at the bottom, the anaerobic zone is provided with a mixer 6 controlled by a driving device, the anoxic zone is provided with a second disc aerator 7B at the bottom, the aerobic zone is provided with a third disc aerator 7C at the bottom; part of the activated sludge in the sedimentation zone is refluxed to the pre-denitration zone through the sludge pump 4 and the first reflux pipeline 11A, part of the activated sludge in the sedimentation zone is refluxed to the anaerobic zone through the sludge pump 4 and the second reflux pipeline 11B, the aerobic zone is provided with suspended fillers, and the nitration liquid part thereof is output to the anoxic zone through the nitration liquid reflux pump 3 and the second nitration liquid reflux pipeline 12B, and the material output of the reducing agent solution tank 1 is connected to the pre-denitration zone; further comprising:

[0055] A, the water inlet end in the aerobic zone is communicated with the water inlet end of the sedimentation zone through a polyline flow channel, the polyline flow channel is provided with an MBBR reactor 8 and a submersible propeller 9 which are spaced apart along the direction of wastewater transmission, the MBBR reactor 8 comprises a cylinder 8A, the suspended filler 8B is arranged in the cylinder 8A, the flat plate aerator 8D is communicated with the aeration pipeline 13 at the bottom of the aerobic zone and can make the suspended filler 8B in the cylinder 8A in a fluidized state, the surface of the cylinder 8A is provided with an opening 8F which is communicated with the inside of the cylinder 8A, the opening 8F is a long round hole which is spaced apart along the axial direction and the radial direction of the cylinder 8A; the cylinder 8A is fixed to the bottom of the aerobic zone through the support 8E, and the cylinder 8A adopts a segmented structure connected through the flange 8C;

[0056] B, the pre-denitrification zone is fixed with a catalyst carrier frame 10, the carrier 10G is fixed on the catalyst carrier frame 10, the catalyst for chemical catalytic reduction denitrification is carried on the carrier 10G, the metal active component in the catalyst is composed of Pd and Cu, the mass fraction ratio of Pd and Cu is Pd: Cu = 1 ~ 1.5: 1 ~ 1.5; part of the nitrification liquid in the aerobic zone is output to the pre-denitrification zone through the nitrification liquid reflux pump 3 and the first nitrification liquid reflux pipeline 12A.

[0057] The carrier 10G is fixed with the catalyst carrier frame 10 through the suspension rod 10C, the carrier 10G adopts macroporous polystyrene resin, the specific surface area is 400m 2 / g ~ 600m 2 / g, the pore volume is 0.4m 3 / g ~ 2.0m 3 / g, and the pore size is 3.0nm ~ 5.0nm.

[0058] The catalyst carrier frame 10 is connected with the pre-denitrification zone pool wall through the guide rail 10D, the catalyst carrier frame 10 adopts a frame structure composed of a ring frame rod 10A, a horizontal transverse rod 10E, a horizontal longitudinal rod 10F and a vertical connecting rod 10B.

[0059] The material output of the reducing agent solution tank 1 is connected with the pre-denitrification zone through the dosing pump 2 and the dosing pipeline 14, and the reducing agent adopts formic acid or sodium formate.

[0060] The Roots blower 5 is connected with the first disc type aeration head 7A, the second disc type aeration head 7B and the third disc type aeration head 7C in sequence through the aeration pipeline 13.

[0061] The improved A 3 / O+MBBR domestic sewage treatment device and a use method thereof, which comprises the following steps:

[0062] a. The sewage enters the pre-denitrification zone, part of the activated sludge in the sedimentation zone is refluxed to the pre-denitrification zone, and part of the nitrification liquid in the aerobic zone is refluxed to the pre-denitrification zone;

[0063] b. The reducing agent is added to the pre-denitrification zone from the reducing agent solution tank 1, and the refluxed sludge input from the sedimentation zone and part of the nitrification liquid input from the aerobic zone are subjected to chemical catalytic reduction denitrification reaction under the action of the reducing agent and the catalyst, and are subjected to biological denitrification reaction under the action of the activated sludge;

[0064] c. The sewage generated in the pre-denitrification zone and part of the activated sludge generated in the sedimentation zone are refluxed to the anaerobic zone to perform anaerobic phosphorus release and organic matter degradation;

[0065] d. The sewage generated in the anaerobic zone and the nitrification liquid generated in the aerobic zone are output to the anoxic zone to perform biological denitrification and organic matter degradation;

[0066] e. Wastewater generated in the anoxic zone enters MBBR reactor 8 in the aerobic zone, where organic matter is fully degraded, nitrogen in the wastewater undergoes nitrification to form nitrate nitrogen, and polyphosphate-accumulating bacteria undergo aerobic phosphorus uptake.

[0067] f. The effluent from the aerobic zone enters the sedimentation zone for sludge-water separation. Part of the generated activated sludge is returned to the pre-denitrification zone and the anaerobic zone, while the remainder is discharged as surplus sludge.

Claims

1. Improved A 3 The improved O+MBBR domestic sewage treatment device comprises a pre-denitrification zone, an anaerobic zone, an anoxic zone, an aerobic zone and a sedimentation zone which are sequentially communicated. Part of the activated sludge in the sedimentation zone is returned to the pre-denitrification zone and the anaerobic zone. The aerobic zone is provided with suspended filler, and part of the nitrification liquid in the aerobic zone is output to the anoxic zone. The material output of the reducing agent solution tank (1) is connected to the pre-denitrification zone. A. The MBBR reactor (8) is arranged in the aerobic zone along the direction of wastewater transmission, the water inlet of the aerobic zone is communicated with the water inlet of the sedimentation zone through the polyline flow channel, the MBBR reactor (8) is arranged in the polyline flow channel, the MBBR reactor (8) comprises a cylinder (8A), the suspended filler (8B) is arranged in the cylinder (8A), the flat plate aerator (8D) is communicated with the aeration pipeline (13) at the bottom of the aerobic zone and can make the suspended filler (8B) in the cylinder (8A) in the fluidized state, and the surface of the cylinder (8A) is provided with the opening (8F) communicated with the inside of the cylinder (8A). B, a catalyst carrier frame (10) is fixed in the pre-denitration zone, a carrier (10G) is fixed on the catalyst carrier frame (10), a catalyst for chemical catalytic reduction denitrification is carried on the carrier (10G), the metal active component of the catalyst is composed of Pd and Cu, the mass fraction ratio of the two is Pd: Cu = 1-1.5: 1-1.5; the carrier (10G) adopts macroporous polystyrene resin, the specific surface area of the carrier (10G) is 400m 2 / g-600m 2 / g, the pore volume is 0.4m 3 / g-2.0m 3 / g, and the pore size is 3.0nm-5.0nm; the nitrification liquid of the aerobic zone is partially output to the pre-denitration zone.

2. The improved A of claim 1 3 / O+MBBR domestic sewage treatment device, characterized in that The polyline flow channel is provided with the submersible thruster (9) at intervals.

3. The improved A of claim 1 or 2 3 / O+MBBR domestic sewage treatment device, characterized in that The opening (8F) is a long circle arranged at intervals along the axial and radial directions of the cylinder (8A).

4. The improved A of claim 1 or 2 3 / O+MBBR domestic sewage treatment device, characterized in that The bottom of the cylinder (8A) is fixed with the bottom of the aerobic zone through the support (8E).

5. The improved A of claim 1 3 / O+MBBR domestic sewage treatment device, characterized in that The cylinder (8A) adopts the segmented structure connected through the flange (8C).

6. The improved A of claim 1 3 / O+MBBR domestic sewage treatment device, characterized in that The carrier (10G) is fixed with the catalyst carrier frame (10) through the suspension rod (10C).

7. The improved A of claim 1 3 / O+MBBR domestic sewage treatment device, characterized in that The catalyst carrier frame (10) is connected with the pool wall of the pre-denitration zone through the guide rail (10D).

8. The improved A of claim 1 or 7 3 / O+MBBR domestic sewage treatment device, characterized in that The catalyst carrier frame (10) adopts the frame structure composed of the ring frame rod (10A), the horizontal transverse rod (10E), the horizontal longitudinal rod (10F) and the vertical connecting rod (10B).

9. The improved A of claim 1 3 / O+MBBR domestic sewage treatment device, characterized in that The material output of the reducing agent solution tank (1) is connected with the pre-denitration zone through the dosing pump (2), and the reducing agent is formic acid or sodium formate.

10. The improved A of claim 1 3 / O+MBBR domestic sewage treatment device, characterized in that Part of the sludge formed in the sedimentation zone is returned to the pre-denitration zone and the anaerobic zone through the sludge discharge pump (4).

11. The improved A of claim 1 3 / O+MBBR domestic sewage treatment device, characterized in that The nitrification liquid generated in the aerobic zone is output to the anoxic zone through the nitrification liquid return pump (3).

12. The improved A of any one of claims 1-11 3 Method for using the / O+MBBR domestic sewage treatment device, characterized in that The method comprises the following steps: a. The wastewater enters the pre-denitration zone, part of the activated sludge in the sedimentation zone is returned to the pre-denitration zone, and part of the nitrification liquid in the aerobic zone is returned to the pre-denitration zone; b. The reducing agent is added to the pre-denitration zone from the reducing agent solution tank (1), and the returned sludge input from the sedimentation zone and part of the nitrification liquid input from the aerobic zone are subjected to chemical catalytic reduction denitrification reaction under the action of the reducing agent and the catalyst, and biological denitrification reaction under the action of the activated sludge; c. The wastewater generated in the pre-denitration zone and part of the activated sludge generated in the sedimentation zone are returned to the anaerobic zone to perform anaerobic phosphorus release and organic matter degradation; d. The wastewater generated in the anaerobic zone and the nitrification liquid generated in the aerobic zone are output to the anoxic zone to perform biological denitrification and organic matter degradation; e. The wastewater generated in the anoxic zone enters the MBBR reactor (8) in the aerobic zone, the organic matter is fully degraded, the nitrogen in the wastewater is subjected to nitrification reaction to form nitrate nitrogen, and the polyphosphorus bacteria are subjected to aerobic phosphorus absorption reaction; f. The effluent of the aerobic zone enters the sedimentation zone for sludge-water separation, part of the activated sludge generated is returned to the pre-denitration zone and the anaerobic zone, and the rest is discharged as residual sludge.

Images