A sewage treatment device based on a multi-section mud film combined process

Abstract

The application discloses a sewage treatment device based on a multi-section mud film combined process, and relates to the technical field of sewage treatment. The sewage treatment device is mainly composed of a water inlet unit, an activated sludge adsorption unit, a first-stage vertical flow sedimentation unit, an anoxic MABR unit, an anaerobic MBBR unit, a second-stage vertical flow sedimentation unit, a gas supply system and a water outlet pipe. The water inlet pipe is arranged at the front end of the activated sludge adsorption unit. The water outlet pipe is connected to the sedimentation end of the second-stage vertical flow sedimentation unit after the sewage is deposited in the second-stage vertical flow sedimentation unit. The gas supply pipeline is arranged in the gas supply system and supplies gas to the activated sludge adsorption unit, the anoxic MABR unit and the anaerobic MBBR unit. Part of the sewage treated by the activated sludge adsorption unit enters the anaerobic MBBR unit to be mixed and treated after passing through the anoxic MABR unit, so that the carbon and nitrogen in the sewage can be efficiently removed. The sewage treatment device has the characteristics of not needing to add carbon source, low sludge yield and strong impact resistance.

Description

Technical Field

[0001] This utility model relates to the field of wastewater treatment technology, and in particular to a wastewater treatment device using a multi-stage mud-film combined process. Background Technology

[0002] In my country, municipal wastewater generally exhibits a low carbon-to-nitrogen ratio. To achieve high-standard nitrogen removal, it is often necessary to supplement a large amount of carbon source to improve the nitrogen removal efficiency of municipal wastewater. However, this process is costly and generates a large amount of sludge. In the context of the era of carbon peaking and carbon neutrality, relying on traditional methods of adding carbon sources to improve total nitrogen removal efficiency cannot meet the increasingly stringent requirements for carbon reduction and low-carbon development.

[0003] Anaerobic ammonia oxidation technology has been successfully applied in the field of high-concentration ammonia nitrogen wastewater, but it has not been widely promoted in the mainstream municipal wastewater treatment field. The main reasons are the inhibitory effect of organic matter on anaerobic ammonia oxidizing bacteria and the difficulty in the stable accumulation of nitrite during short-cut nitrification.

[0004] Patent CN 104909520 A invented a combined MABR and MBR wastewater treatment device and method, which eliminates the dependence of sludge age on hydraulic retention time, allowing each component to leverage its advantages and achieve low-energy consumption and high-efficiency nitrogen and phosphorus removal. However, in actual production, submerged MBRs suffer from membrane fouling, complex membrane cleaning processes, short membrane lifespan, and high membrane replacement costs.

[0005] Patent CN 112830577 A invented a one-stage EGSB anaerobic ammonia oxidation device based on MABR, which fully demonstrates the effectiveness of MABR in enriching ammonia-oxidizing bacteria (AOB). The combination of the two has a good synergistic effect in the treatment of high ammonia nitrogen wastewater. However, industrial wastewater contains a large amount of organic matter, which has an inhibitory effect on AOB and anaerobic ammonia-oxidizing bacteria. This patent uses artificially prepared high-concentration ammonia nitrogen wastewater and does not take pretreatment measures to remove organic matter, making it difficult to directly promote and apply in actual production.

[0006] Therefore, this utility model develops a wastewater treatment device with a multi-stage mud-film combination process to achieve low-cost and high-efficiency denitrification of industrial municipal wastewater. Utility Model Content

[0007] The purpose of this invention is to address the problems of high cost and poor practicality in existing denitrification technologies by providing a wastewater treatment device with a multi-stage mud-film combined process.

[0008] The main wastewater treatment process of this utility model adopts the following steps: influent → activated sludge adsorption unit → anoxic MABR unit → anaerobic MBBR unit → effluent. Some of the wastewater treated by the activated sludge adsorption unit passes through the anoxic MABR unit and is mixed with the wastewater treated by the anoxic MABR unit in a certain proportion. Then it is treated by the anaerobic MBBR unit to achieve efficient removal of organic matter, ammonia nitrogen and total nitrogen in the wastewater and achieve standard discharge.

[0009] This utility model is achieved through the following technical solution: A wastewater treatment device based on a multi-stage sludge membrane combined process is characterized by comprising an influent unit, an activated sludge adsorption unit, a first-stage vertical flow sedimentation unit, an anoxic MABR unit, an anaerobic MBBR unit, a second-stage vertical flow sedimentation unit, an air supply system, and an effluent pipe. The activated sludge adsorption unit has an influent pipe at its front end and effluent at its end entering the first-stage vertical flow sedimentation unit. The effluent from the first-stage vertical flow sedimentation unit sequentially enters the anoxic MABR unit, the anaerobic MBBR unit, and the second-stage vertical flow sedimentation unit. After sedimentation in the second-stage vertical flow sedimentation unit, the effluent is connected to the effluent pipe at the sedimentation end of the second-stage vertical flow sedimentation unit. The air supply system is equipped with air supply pipelines to supply air to the activated sludge adsorption unit, the anoxic MABR unit, and the anaerobic MBBR unit respectively. The water inlet system comprises an inlet tank, an inlet pump, an inlet pipe, and valves. The inlet pipe is divided into an inlet pipe for the activated sludge adsorption unit, an inlet pipe for the anoxic MABR unit, and an inlet pipe for the anaerobic MBBR unit. The water to be treated enters the activated sludge adsorption unit, the anoxic MABR unit, and the anaerobic MBBR unit, respectively. The flow rate is controlled by the inlet valves for the activated sludge adsorption unit, the anoxic MABR unit, and the anaerobic MBBR unit, respectively. A disc aerator is installed at the bottom of the activated sludge adsorption unit; a MABR membrane module is installed in the anoxic MABR unit. The anaerobic MBBR unit is equipped with water treatment packing material and a liftable submersible jet mixer, and an interception net is installed at the end of the tank. The effluent from the anaerobic MBBR unit is located after the interception net and enters the second-stage vertical flow sedimentation unit. The second-stage vertical flow sedimentation unit is equipped with a sludge treatment system. The internal circulation pump sends the sludge to the anaerobic MBBR unit, the anoxic MABR unit, the activated sludge adsorption unit, and the external discharge concentration treatment, respectively. The sludge is controlled by the anaerobic MBBR return control valve, the anoxic MABR return control valve, the activated sludge unit return control valve, and the second-stage vertical flow sedimentation discharge valve, respectively. The air supply system mainly consists of a blower, air supply pipelines, and control valves. The control valves include a disc aeration control valve, a MABR membrane inlet valve, a left-side purge valve for the interceptor mesh, and a right-side purge valve for the interceptor mesh, which respectively control the air supply and purging of the activated sludge adsorption unit and the anoxic MABR unit, as well as the air supply volume to the left and right sides of the interceptor mesh for the anaerobic MBBR unit.

[0010] Furthermore, the outlet pipe of the first-stage vertical flow sedimentation unit is equipped with a bypass valve and a bypass valve for the first-stage vertical flow sedimentation unit; the bypass valve is used to directly allow the effluent from the first-stage vertical flow sedimentation unit to enter the anaerobic MBBR unit; the bypass valve for the first-stage vertical flow sedimentation unit is used for emergency drainage.

[0011] Furthermore, the outlet pipe of the anoxic MABR unit is equipped with an anoxic MABR unit bypass valve for emergency drainage or connection to the second-stage vertical flow sedimentation unit.

[0012] Furthermore, the hypoxia-deficient MABR unit has at least one membrane assembly fixed to a stainless steel support.

[0013] Furthermore, the anaerobic MBBR unit water treatment packing material is a spherical polyurethane packing material with a diameter of 3~5 cm.

[0014] Furthermore, the interception net has evenly distributed water-passing holes with a diameter of 1 to 3 mm on its plane.

[0015] Furthermore, the sedimentation time of the first-stage vertical flow sedimentation unit is 2-4 hours.

[0016] Furthermore, the sedimentation time of the second-stage vertical flow sedimentation unit is 2-4 hours.

[0017] Compared with the prior art, the beneficial effects of this utility model are: This invention fully combines the advantages of activated sludge and various biological contact oxidation packing materials, achieving high-efficiency and low-cost denitrification. It requires no carbon source addition, has low sludge yield, strong shock resistance, and low carbon emissions. This is due to the full utilization of activated sludge's rapid adsorption of organic matter and its large treatment capacity. The biophase stratification and heterogeneous mass transfer of the MABR enhance the competitive advantage of ammonia-oxidizing bacteria on the membrane surface for dissolved oxygen, reducing the production of nitrous oxide during the oxidation of ammonia nitrogen to nitrite. The MBBR's large specific surface area and high biocompatibility enrich anaerobic ammonia-oxidizing bacteria, achieving separation of sludge age and hydraulic retention time. Denitrification efficiency is achieved through water volume ratio adjustment, with minimal or zero addition of chemicals. Attached Figure Description

[0018] Figure 1 This utility model presents a schematic diagram of the structure of a wastewater treatment device based on a multi-stage mud-film combination process.

[0019] Among them, 1-inlet pipe, 2-activated sludge adsorption unit, 3-first-stage vertical flow sedimentation unit, 4-anoxic MABR unit, 5-anaerobic MBBR unit, 6-second-stage vertical flow sedimentation unit, 7-blower, 8-sludge return pump, 9-internal circulation pump, 10-disc aerator, 11-MABR membrane module, 12-water treatment packing, 13-liftable submersible jet mixer, 14-disc aeration control valve, 15-activated sludge unit return control valve, 16-excess sludge discharge valve, 17-overlap valve, 18-anoxic MABR inlet valve, 19-anoxic MABR return valve Control valves, 20-Second stage vertical flow sedimentation discharge valve, 21-MABR membrane air inlet valve, 22-Membrane purge valve, 23-Anaerobic MBBR reflux control valve, 24-Interception screen, 25-Interception screen left side purge valve, 26-Interception screen right side purge valve, 27-First stage vertical flow sedimentation unit bypass valve, 28-Anoxic MABR unit bypass valve, 29-Anoxic MABR unit effluent valve, 30-Activated sludge adsorption unit inlet valve, 31-Anoxic MABR unit inlet valve, 32-Anaerobic MBBR unit inlet valve, 33-Inlet pump, 34-Inlet storage tank, 35-Effluent pipe. Detailed Implementation

[0020] The present invention will be further described below with reference to the embodiments. However, the scope of the present invention is not limited to the following embodiments. Those skilled in the art will understand that various changes and modifications can be made to the present invention without departing from the spirit and scope thereof.

[0021] The wastewater treatment device based on the multi-stage sludge membrane combined process mainly consists of an influent unit, an activated sludge adsorption unit 2, a first-stage vertical flow sedimentation unit 3, an anoxic MABR unit 4, an anaerobic MBBR unit 5, a second-stage vertical flow sedimentation unit 6, an air supply system, and an effluent pipe 35. The activated sludge adsorption unit 2 has an influent pipe at its front end and its effluent enters the first-stage vertical flow sedimentation unit 3 at its end. The effluent from the first-stage vertical flow sedimentation unit 3 sequentially enters the anoxic MABR unit 4, the anaerobic MBBR unit 5, and the second-stage vertical flow sedimentation unit 6. After passing through the second-stage vertical flow sedimentation unit 6... After sedimentation, the water is connected to the outlet pipe 35 at the end of the sedimentation of the second-stage vertical flow sedimentation unit 6. The air supply system is equipped with air supply pipelines to supply air to the activated sludge adsorption unit 2, the anoxic MABR unit 4 and the anaerobic MBBR unit 5 respectively. The water inlet system consists of an inlet storage tank 34, an inlet pump 33, an inlet pipe and valves. The inlet pipe 1 is divided into an activated sludge adsorption unit inlet pipe 1, an anoxic MABR unit inlet pipe and an anaerobic MBBR unit inlet pipe. The water to be treated enters the activated sludge adsorption unit 2, the anoxic MABR unit 4 and the anaerobic MBBR unit 5 respectively.

[0022] The amount of water entering the activated sludge adsorption unit 2 is controlled by the inlet valve 30 of the activated sludge adsorption unit, the amount of water entering the anoxic MABR unit 4 is controlled by the inlet valve 18 of the anoxic MABR unit, and the amount of water entering the anaerobic MBBR unit 5 is controlled by the inlet valve 32 of the anaerobic MBBR unit.

[0023] Meanwhile, a disc aerator 10 is installed at the bottom of the activated sludge adsorption unit 2; a MABR membrane module 11 is installed in the anoxic MABR unit 4; at least one MABR membrane module 11 is installed in the anoxic MABR unit 4 and fixed on a stainless steel support; a spherical polyurethane water treatment packing and a liftable submersible jet mixer 13 are installed in the anaerobic MBBR unit 5, and an interception net 24 is installed at the end of the tank. The effluent from the anaerobic MBBR unit 5 enters the second-stage vertical flow sedimentation unit 6 after the interception net 24.

[0024] The second-stage vertical flow sedimentation unit 6 is equipped with a sludge treatment system. The internal circulation pump 9 sends the sludge to the anaerobic MBBR unit 5, the anoxic MABR unit 4, the activated sludge adsorption unit 2, and the external discharge concentration treatment, which are controlled by the anaerobic MBBR return control valve 23, the anoxic MABR return control valve 19, the activated sludge unit return control valve 15, and the excess sludge discharge valve 16, respectively.

[0025] The air supply system mainly consists of a blower 7, air supply pipelines, and control valves. The disc aeration control valve 14 controls the air intake of the activated sludge adsorption unit 2; the MABR membrane air inlet valve 21 controls the air supply of the anoxic MABR unit 4; the membrane purge valve 22 controls the air supply to purge the anoxic MABR unit 4; an interception net 24 is installed on the effluent side of the anaerobic MBBR unit 5; and distributed perforated pipe aeration is installed on both sides of the interception net 24, controlled by the purge valve 25 on the left side of the interception net and the purge valve 26 on the right side of the interception net.

[0026] The first-stage vertical flow sedimentation unit 3 is equipped with a bypass valve 17 on its outlet pipe, allowing the effluent to directly enter the anaerobic MBBR unit 5. This valve is used to adjust the influent to the anaerobic MBBR unit 5 and ensure the carbon source supply. A bypass valve 27 is also installed in the first-stage vertical flow sedimentation unit 3 for emergency drainage. The anoxic MABR unit 4 is equipped with an anoxic MABR unit bypass valve 28 on its outlet pipe for emergency drainage or connection to the second-stage vertical flow sedimentation unit 20. The sedimentation time in the first-stage vertical flow sedimentation unit 3 is 2–4 hours; the sedimentation time in the second-stage vertical flow sedimentation unit 6 is also 2–4 hours.

[0027] Example 1: A wastewater treatment device using a multi-stage mud-film combined process was selected for treating urban wastewater.

[0028] The influent water quality of urban sewage is as follows: COD Cr150~350 mg / L, BOD5 60~210 mg / L, NH3-N 25~45mg / L, TN 30~50 mg / L, TP 3~8 mg / L.

[0029] The components are connected according to the above-described connection relationship. The anoxic MABR unit 4 contains 10 sets of MABR membrane modules 11, fixed to a stainless steel support. The anaerobic MBBR unit 5 contains spherical polyurethane water treatment packing material, with a packing density designed at 50%. The sedimentation time of the first-stage vertical flow sedimentation unit 3 is 2 hours; the sedimentation time of the second-stage vertical flow sedimentation unit 6 is 3 hours. When the influent flow rate is controlled using the overpass valve 17, the proportion of water directly flowing into the anaerobic MBBR unit 5 after treatment by the first-stage vertical flow sedimentation unit 3 is 35%~45%, and the proportion flowing into the anaerobic MBBR unit 5 after treatment by the anoxic MABR unit 4 is 55%~65%. The reflux ratio of the anaerobic MBBR unit 5 is 100%~300%, the dissolved oxygen is 0~0.2 mg / L, and the opening frequency of the left-side purge valve 25 and the right-side purge valve 26 of the interceptor mesh 24 is 1~2 times per day, each time for 30~60 seconds. After stable commissioning and operation, the COD of the treated effluent is... Cr Ammonia nitrogen and total nitrogen meet the discharge standards, i.e., the effluent COD Cr <50 mg / L, ammonia nitrogen <5 mg / L, total nitrogen <15 mg / L.

[0030] The above embodiments are provided to those skilled in the art to fully disclose and describe how the claimed implementations can be carried out and used, and are not intended to limit the scope of the disclosure herein. Obvious modifications will be apparent to those skilled in the art within the scope of the appended claims.

Claims

1. A wastewater treatment device based on a multi-stage mud-film combined process, characterized in that: It mainly consists of an inlet unit, an activated sludge adsorption unit, a first-stage vertical flow sedimentation unit, an anoxic MABR unit, an anaerobic MBBR unit, a second-stage vertical flow sedimentation unit, an air supply system, and an outlet pipe. The activated sludge adsorption unit is equipped with an inlet pipe at the front end and the effluent at the end enters the first-stage vertical flow sedimentation unit. The effluent from the first-stage vertical flow sedimentation unit enters the anoxic MABR unit, the anaerobic MBBR unit, and the second-stage vertical flow sedimentation unit in sequence. After sedimentation in the second-stage vertical flow sedimentation unit, the effluent is connected to the outlet pipe at the end of the sedimentation of the second-stage vertical flow sedimentation unit. The air supply system is equipped with air supply pipelines to supply air to the activated sludge adsorption unit, the anoxic MABR unit, and the anaerobic MBBR unit respectively. The water inlet unit comprises an inlet tank, an inlet pump, an inlet pipe, and valves. The inlet pipe is divided into an inlet pipe for the activated sludge adsorption unit, an inlet pipe for the anoxic MABR unit, and an inlet pipe for the anaerobic MBBR unit. The water to be treated enters the activated sludge adsorption unit, the anoxic MABR unit, and the anaerobic MBBR unit, respectively. The flow rate is controlled by the inlet valves for the activated sludge adsorption unit, the anoxic MABR unit, and the anaerobic MBBR unit, respectively. A disc aerator is installed at the bottom of the activated sludge adsorption unit; a MABR membrane module is installed in the anoxic MABR unit. The anaerobic MBBR unit is equipped with water treatment packing material and a liftable submersible jet mixer, and an interception net is installed at the end of the tank. The effluent from the anaerobic MBBR unit is located after the interception net and enters the second-stage vertical flow sedimentation unit. The second-stage vertical flow sedimentation unit is equipped with a sludge treatment system. The internal circulation pump sends the sludge to the anaerobic MBBR unit, the anoxic MABR unit, the activated sludge adsorption unit, and the external discharge concentration treatment, respectively. The sludge is controlled by the anaerobic MBBR return control valve, the anoxic MABR return control valve, the activated sludge unit return control valve, and the second-stage vertical flow sedimentation discharge valve, respectively. The air supply system mainly consists of a blower, air supply pipelines, and control valves. The control valves include a disc aeration control valve, a MABR membrane inlet valve, a left-side purge valve for the interceptor mesh, and a right-side purge valve for the interceptor mesh, which respectively control the air supply and purging of the activated sludge adsorption unit and the anoxic MABR unit, as well as the air supply volume to the left and right sides of the interceptor mesh for the anaerobic MBBR unit.

2. The wastewater treatment device based on a multi-stage mud-film combined process according to claim 1, characterized in that, The effluent pipe of the first-stage vertical flow sedimentation unit is equipped with an overpass valve and a bypass valve for the first-stage vertical flow sedimentation unit; the overpass valve is used to directly allow the effluent from the first-stage vertical flow sedimentation unit to enter the anaerobic MBBR unit; the bypass valve for the first-stage vertical flow sedimentation unit is used for emergency drainage.

3. The wastewater treatment device based on a multi-stage mud-film combined process according to claim 1, characterized in that, The outlet pipe of the anoxic MABR unit is equipped with an anoxic MABR unit bypass valve for emergency drainage or connection to the second-stage vertical flow sedimentation unit.

4. The wastewater treatment device based on a multi-stage sludge membrane combined process according to claim 1, characterized in that, The anoxic MABR unit has at least one membrane module, which is fixed on a stainless steel support.

5. The wastewater treatment device based on a multi-stage mud-film combined process according to claim 1, characterized in that, The anaerobic MBBR unit water treatment packing material is a spherical polyurethane packing material with a diameter of 3~5 cm.

6. The wastewater treatment device based on a multi-stage sludge membrane combined process according to claim 1, characterized in that, The interception net has evenly distributed water-passing holes with a diameter of 1 to 3 mm on its plane.

7. The wastewater treatment device based on a multi-stage mud-film combined process according to claim 1, characterized in that, The sedimentation time for the first-stage vertical flow sedimentation unit is 2-4 hours; the sedimentation time for the second-stage vertical flow sedimentation unit is 2-4 hours.

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