A high-efficiency biochemical treatment device for high ammonia nitrogen organic wastewater

Abstract

This utility model relates to the field of wastewater treatment technology, specifically disclosing a high-efficiency biochemical treatment device for high-ammonia nitrogen organic wastewater, comprising: a collection tank; an ammonia nitrogen detection system; an influent control system; a control unit one; a biochemical reaction section; an internal reflux control system; a control unit two, which, based on ammonia nitrogen detection or the operating status of the reaction section, links the agitator and valves to dynamically control the reflux water volume; an MBR membrane permeate control system; a pump two; an electromagnetic flowmeter three; an electric regulating valve three; and a control unit three, which, based on effluent water quality or flow rate requirements, links the pump, flowmeter, and valves to automatically adjust the permeate flow rate. The collection tank, biochemical reaction section, and membrane tank are connected by pipelines, and the influent control system, internal reflux control system, and MBR membrane permeate control system are located in corresponding positions. Through the intelligent influent control system, internal reflux control system, and MBR membrane permeate control system, the continuous stability of the influent ammonia nitrogen load and the quality of the permeate are ensured.

Description

Technical Field

[0001] This utility model relates to the field of organic wastewater treatment technology, specifically to a high-efficiency biochemical treatment device for high ammonia nitrogen organic wastewater. Background Technology

[0002] High ammonia nitrogen organic wastewater is usually treated using traditional anoxic / aerobic combined biological treatment devices. However, these devices often suffer from problems such as poor ammonia nitrogen degradation efficiency due to the high concentration of ammonia nitrogen in the influent inhibiting microorganisms, poor automatic control and regulation during water quality fluctuations due to low system integration, and high energy consumption during large-scale internal recirculation due to the use of traditional water pumps.

[0003] Therefore, there is an urgent need to design a highly efficient biochemical treatment device that can treat organic wastewater with high ammonia nitrogen content. Utility Model Content

[0004] This invention provides a high-efficiency biochemical treatment device for high-ammonia nitrogen organic wastewater. The influent control system automatically and precisely adjusts the influent flow rate based on the ammonia nitrogen concentration using a pump outlet flow meter and an electric regulating valve, ensuring a continuous and stable influent ammonia nitrogen load. The internal recirculation control system employs a submersible pipeline propulsion device, which not only offers a large flow rate and significantly saves energy compared to traditional pump circulation, but also allows for variable frequency adjustment of the ratio of internal recirculation flow to influent wastewater flow. The internal recirculation flow rate is automatically and precisely controlled by an electric regulating valve and an electromagnetic flow meter in the internal recirculation pipeline, significantly diluting and adjusting the influent ammonia nitrogen concentration, reducing the inhibitory effect of high ammonia nitrogen on microorganisms, and thus improving the biodegradation effect of ammonia nitrogen. The MBR membrane permeate control system effectively traps sludge, greatly increasing the sludge concentration in the biochemical system, thereby improving the treatment effect of the biochemical system. Simultaneously, the automatic and precise control of the MBR membrane permeate flow rate using a pump outlet flow meter and an electric regulating valve ensures the quality of the permeate water.

[0005] The present invention solves the above-mentioned technical problems through the following technical solution:

[0006] A high-efficiency biochemical treatment device for high ammonia nitrogen organic wastewater, comprising, in sequence:

[0007] catch basin;

[0008] An ammonia nitrogen detection system is used to obtain the ammonia nitrogen concentration of wastewater in a collection tank online.

[0009] The water inlet control system includes:

[0010] Pump 1;

[0011] Electromagnetic flowmeter 1;

[0012] Electric regulating valve 1;

[0013] Control unit 1, based on the signal from the ammonia nitrogen detection system, links pump 1, electromagnetic flow meter 1, and electric regulating valve 1 to automatically adjust the inlet water flow rate;

[0014] The biochemical reaction section is equipped with an anoxic biochemical tank and an aerobic tank in sequence.

[0015] The internal reflux control system includes:

[0016] Pipeline variable frequency submersible mixer;

[0017] Electromagnetic flowmeter II;

[0018] Electric regulating valve 2;

[0019] Control unit 2, based on ammonia nitrogen detection or the operating status of the reaction section, links the agitator and valves to dynamically control the return water volume;

[0020] The MBR membrane permeate control system includes:

[0021] MBR membrane modules and membrane tanks;

[0022] Pump 2;

[0023] Electromagnetic flowmeter 3;

[0024] Electric regulating valve three;

[0025] Control unit three, based on the required effluent quality or flow rate, links the pump, flow meter, and valve to automatically adjust the effluent flow rate;

[0026] The aforementioned water collection tank, biochemical reaction section, and membrane tank are connected by pipelines, and the influent control system, internal reflux control system, and MBR membrane permeate control system are located in corresponding positions.

[0027] In one specific embodiment, the ammonia nitrogen detection system consists of an online ammonia nitrogen sensor and its signal processing module installed in the side wall of the water collection tank.

[0028] In one specific embodiment, the aerobic tank in the biochemical reaction section is equipped with an aeration disc.

[0029] In a specific embodiment, the pipeline-type variable frequency submersible mixer in the internal reflux control system is linked with the control unit 2 via a frequency converter.

[0030] In one specific embodiment, the MBR membrane module is any one of flat sheet / tubular / hollow fiber membrane.

[0031] In a specific embodiment, the control units one, two, and three are programmable logic controllers or microcontroller-based platforms, and have human-machine interfaces for visual monitoring and remote adjustment.

[0032] In one specific embodiment, the device includes a water collection tank, an anoxic biochemical tank, a first aerobic tank, a second aerobic tank, a third aerobic tank, and a membrane tank arranged sequentially. The water collection tank is equipped with an ammonia nitrogen detection sensor, a level gauge, and a submersible mixer, and is connected to the anoxic biochemical tank via pipelines. A pump, an electromagnetic flow meter, and an electric regulating valve are installed on the pipelines. The biochemical reaction section includes one anoxic biochemical tank and three aerobic tanks, which are connected by water passages. An aeration disc is installed in the aerobic tank, and oxygen is supplied to the aeration disc by an aerobic blower. A membrane tank is located next to the aerobic tank farthest from the anoxic biochemical tank. The membrane tank is equipped with a level gauge and an MBR membrane, and is connected to the anoxic tank through an internal reflux control system to form reflux.

[0033] The beneficial effects of this utility model are as follows:

[0034] (1) This patented treatment device is suitable for high ammonia nitrogen organic wastewater. Through the intelligent influent control system, internal reflux control system and MBR membrane permeate control system, it ensures the continuous and stable influent ammonia nitrogen load and permeate water quality. At the same time, the energy-saving internal reflux high flow rate dilutes the influent ammonia nitrogen concentration, reduces the influent ammonia nitrogen concentration of the biochemical system, greatly weakens the inhibitory effect of ammonia nitrogen on microorganisms, and effectively improves the ammonia nitrogen degradation effect.

[0035] (2) The front end of the device is an intelligent water inlet control system. First, the ammonia nitrogen concentration in the inlet is detected by an ammonia nitrogen detector. Then, the water inlet flow rate is adjusted and controlled by an electric regulating valve and an electromagnetic flow meter to keep the water ammonia nitrogen load continuously stable.

[0036] (3) The middle part of the device is an intelligent internal reflux control system. The internal reflux control system adopts a pipeline variable frequency submersible mixer, which not only has a large flow rate and saves energy much more than the traditional water pump circulation, but also can adjust the ratio of effluent reflux flow rate to wastewater inlet flow rate by frequency conversion. The reflux flow rate is automatically and accurately controlled and adjusted by electromagnetic flow meter, thereby controlling the ammonia nitrogen concentration in the biochemical system inlet.

[0037] (4) The end of the device is the MBR membrane permeate control system. The MBR membrane can effectively intercept sludge, greatly increase the sludge concentration of the biological system, and thus improve the treatment effect of the biological system. At the same time, the MBR membrane permeate flow rate is automatically and accurately controlled by the pump outlet flow meter and electric regulating valve to ensure the quality of permeate water. Attached Figure Description

[0038] To more clearly illustrate the technical solutions in this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort. Figure 1 The diagram shown is a structural schematic of this utility model; in the figure: 1. Water collection tank;

[0039] 2. Ammonia nitrogen sensor;

[0040] 3. Level gauge 1;

[0041] 4. Submersible mixer;

[0042] 5. Pump inlet manual valve;

[0043] 6. Pump 1;

[0044] 7. Electromagnetic flowmeter (one type);

[0045] 8. Electric regulating valve one;

[0046] 9. Anoxic biological treatment tank;

[0047] 10. Ammonia nitrogen detector;

[0048] 11. Submersible mixer II;

[0049] 12. Aerobic blower;

[0050] 13. Water passage hole one;

[0051] 14. Aeration disc;

[0052] 15. Aerobic tank one;

[0053] 16. Water passage hole two;

[0054] 17. Aerobic tank two;

[0055] 18. Three water passage holes;

[0056] 19. Aerobic tank three;

[0057] 20. Four water passage holes;

[0058] 21. MBR membrane blower;

[0059] 22. Membrane pool;

[0060] 23. Level gauge two;

[0061] 24. MBR membrane;

[0062] 25. One manual valve for the internal reflux pipeline;

[0063] 26. Pipeline-type variable frequency submersible mixer;

[0064] 27. Electromagnetic flowmeter II;

[0065] 28. Electric regulating valve two;

[0066] 29. Manual valve two for internal reflux pipeline;

[0067] 30. Electric regulating valve three;

[0068] 31. Pump 2;

[0069] 32. Electromagnetic flowmeter (III). Detailed Implementation

[0070] The technical solutions of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0071] Example 1

[0072] Taking a specific biochemical treatment device as an example, the overall layout of the device

[0073] The device described in this embodiment has a daily processing capacity of 500m³. 3 / d, consisting of a water collection tank 1, anoxic biochemical tank 9, aerobic tank 15, aerobic tank 27, aerobic tank 319 and membrane tank 22, and connected by acid and alkali resistant carbon steel pipelines.

[0074] Water collection tank 1 and its ammonia nitrogen detection system

[0075] Water collection tank volume: 10m³ 3 It is equipped with one submersible mixer (model: JYW5-4 / 0.75kW) to prevent sedimentation.

[0076] Ammonia nitrogen detection system: An online ammonia nitrogen sensor 2 (model: YSI EXO3, measurement range 0–100 mg / L, accuracy ±0.1 mg / L) is installed in the middle of the pool side wall. Its signal is output to the signal processing module (SIEMENS SITRANS P320) via 4–20mA and transmitted to the control unit 1.

[0077] Liquid level monitoring: Install a hydrostatic level gauge (model: Endress+Hauser FMX50) to prevent the pump from drying out or overflowing.

[0078] Water inlet control system

[0079] Pump 16: Domestic vertical pump (model: GRUNDFOS CR5), rated flow 25m³ / h 3 / h, head 15m.

[0080] Electromagnetic flowmeter 7: SIEMENS SITRANS FM MAG8000 series (DN100 diameter, accuracy ±0.5%).

[0081] Electric regulating valve 8: BELIMO 6-Way regulating valve (model: QT24-SR).

[0082] Control Unit 1: Siemens S7-1200 Programmable Logic Controller with KTP400 Touch Screen HMI.

[0083] Logical description:

[0084] Online ammonia nitrogen sensor 2 samples NH4 every 1 minute. + –N concentration;

[0085] If NH4 in the pool + If N > 50 mg / L, start the pump and open the electric valve to 80%, and the system will operate at 30 m... 3 Water enters at a rate of / h;

[0086] If NH4 + If N < 30 mg / L, the opening will automatically decrease to 30%, and the flow rate will drop to 10 m³ / L. 3 / h;

[0087] When the value is between these two values, the valve opening is adjusted linearly to achieve a value of 10–30m. 3 Continuous adjustment within the range of / h.

[0088] Biochemical reaction section

[0089] Anoxic biological treatment tank 9: Volume 20m³ 3 It is equipped with a light agitator (JYW5-2 / 0.55kW submersible mixer) to maintain mixing.

[0090] Aerobic tanks: Each tank has a volume of 20m³. 3 The bottom of the pool is equipped with stainless steel aeration discs (1.0mm aperture, 2mm bubble diameter), and air is supplied by an aerobic blower 12 (model: AERZEN GM 12).

[0091] Inter-pool connection: The anoxic pool and the aerobic pool are connected through a water passage;

[0092] Internal reflux control system

[0093] Return pipeline: The bottom of membrane tank 22 returns to the anoxic biochemical tank 9.

[0094] Pipeline-type variable frequency submersible mixer: Model JYW5-10 / 1.5kW, which is linked to the control unit through a matching frequency converter (ABB ACS150).

[0095] Electromagnetic flowmeter 2: SITRANS FM MAG8000 (DN80 diameter).

[0096] Electric regulating valve 2: BELIMO QT24-SR.

[0097] Control Unit 2: Also uses Siemens S7-1200, and communicates with the frequency converter via Profibus-DP.

[0098] Control strategy:

[0099] Real-time monitoring of ammonia nitrogen in anoxic biological treatment tank 9 and return water level in membrane tank 22;

[0100] The ammonia nitrogen detector samples NH4 every 1 minute. + –N concentration;

[0101] If NH4 in the pool + If N > 50 mg / L, start the pump and open the electric valve to 80%, and the system will operate at 30 m... 3 Water enters at a rate of / h;

[0102] If NH4 + If N < 30 mg / L, the opening will automatically decrease to 30%, and the flow rate will drop to 10 m³ / L. 3 / h;

[0103] When the value is between these two values, the valve opening is adjusted linearly to achieve a value of 10–30m. 3 Continuous adjustment within the range of / h.

[0104] When the backflow water level is >0.4m, start the mixer and open the valve to 100%, starting the maximum backflow flow rate of 8m³ / h. 3 / h;

[0105] When the backflow level is <0.2m, close the valve to 20%, and the backflow rate will decrease to 2m³ / h. 3 / h;

[0106] For other operating conditions, the return water volume is dynamically adjusted using a proportional-integral (PI) control algorithm.

[0107] MBR membrane permeate control system

[0108] Membrane module: Hollow fiber MBF membrane module (membrane area 400m²) 2 (Total molecular weight cutoff 100 kDa).

[0109] Pump 2.31: Diaphragm pump (model: LEWA Ecoflow), rated production water 5–20m³ 3 / h.

[0110] Electromagnetic flowmeter 32: SITRANS FM MAG8000 (DN80 diameter).

[0111] Electric regulating valve 30: BELIMO QT24-SR.

[0112] Control Unit 3: Siemens S7-1200, which uses HMI to set the target outflow rate or permeability, and monitors the permeability pressure difference (ΔP≤0.1bar) and outflow water quality in real time (online turbidity meter, model HACH TU5+).

[0113] Logical description:

[0114] If the online turbidity is >0.2 NTU, the valve opening will be automatically reduced and the membrane pump speed will be decreased by 5% each time until the turbidity recovers to ≤0.1 NTU;

[0115] When ΔP>0.12bar, an alarm is triggered and the system automatically switches to intermittent backwash mode (30min backwash / 60min run).

[0116] Overall operation process (as shown in the figure):

[0117] High ammonia nitrogen organic wastewater is first mixed evenly in the collection tank 1 by the stirring action of the submersible mixer 4. According to the ammonia nitrogen concentration of the influent detected by the ammonia nitrogen sensor 2, the manual valve 5 of the pump inlet is opened and the pump 6 is started. The influent flow rate is controlled by the linkage between the electromagnetic flow meter 7 and the electric regulating valve 8. After the wastewater enters the anoxic biological treatment tank 9, it is mixed evenly by the pushing and stirring action of the anoxic biological treatment tank. Then, it enters the aerobic tank 15 through the water passage 13, the aerobic tank 17 through the water passage 2 16, the aerobic tank 19 through the water passage 3 18, and the membrane tank 22 through the water passage 4 20. The pump 2 31 is started and the MBR membrane permeate flow rate is controlled by the linkage between the electric regulating valve 3 30 and the electromagnetic flow meter 3 32.

[0118] During system operation, the internal reflux is initiated based on the influent ammonia nitrogen concentration detected by ammonia nitrogen detector 210. This involves opening manual valves 25 and 29 of the internal reflux pipeline, and controlling the internal reflux flow rate through the linkage of electromagnetic flowmeter 27 and electric regulating valve 28. Specifically, aerobic blower 12 provides aeration for aerobic tanks 15, 27, and 39, while MBR membrane blower 21 provides aeration for the MBR membrane 24.

[0119] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on its differences from other embodiments. Similar or identical parts between embodiments can be referred to interchangeably. For the apparatus disclosed in the embodiments, since they correspond to the methods disclosed in the embodiments, the description is relatively simple; relevant parts can be referred to the method section.

[0120] The above description of the disclosed embodiments enables those skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A device for efficient biochemical treatment of high-ammonia-nitrogen organic wastewater, characterized in that, In order, they include: catch basin; An ammonia nitrogen detection system is used to obtain the ammonia nitrogen concentration of wastewater in a collection tank online. The water inlet control system includes: Pump 1; Electromagnetic flowmeter 1; Electric regulating valve 1; Control unit 1, based on the signal from the ammonia nitrogen detection system, links pump 1, electromagnetic flow meter 1, and electric regulating valve 1 to automatically adjust the inlet water flow rate; The biochemical reaction section is equipped with an anoxic biochemical tank and an aerobic tank in sequence. The internal reflux control system includes: Pipeline variable frequency submersible mixer; Electromagnetic flowmeter II; Electric regulating valve 2; Control unit 2, based on ammonia nitrogen detection or the operating status of the reaction section, links the agitator and valves to dynamically control the return water volume; The MBR membrane permeate control system includes: MBR membrane modules and membrane tanks; Pump 2; Electromagnetic flowmeter 3; Electric regulating valve three; Control unit three, based on the required effluent quality or flow rate, links the pump, flow meter, and valve to automatically adjust the effluent flow rate; The aforementioned water collection tank, biochemical reaction section, and membrane tank are connected by pipelines, and the influent control system, internal reflux control system, and MBR membrane permeate control system are located in corresponding positions.

2. The biochemical treatment device according to claim 1, characterized in that The ammonia nitrogen detection system consists of an online ammonia nitrogen sensor and its signal processing module installed in the side wall of the water collection tank.

3. The biochemical treatment device according to claim 1, characterized in that The aerobic tank in the biochemical reaction section is equipped with an aeration disc.

4. The biochemical treatment device according to claim 1, characterized in that The pipeline-type variable frequency submersible mixer in the internal reflux control system is linked to the control unit via a frequency converter.

5. The biochemical treatment device according to claim 1, characterized in that The MBR membrane module is any one of flat sheet / tubular / hollow fiber membrane.

6. The biochemical treatment device according to any one of claims 1 to 5, characterized in that Control units one, two, and three are programmable logic controllers or microcontroller-based platforms, and are equipped with human-machine interfaces for visual monitoring and remote adjustment.

7. The biochemical treatment device according to claim 1, characterized in that The device comprises a water collection tank, an anoxic biological treatment tank, aerobic tank 1, aerobic tank 2, aerobic tank 3, and a membrane tank arranged sequentially. The water collection tank is equipped with an ammonia nitrogen sensor, a level gauge, and a submersible mixer, and is connected to the anoxic biological treatment tank via pipelines. A pump, an electromagnetic flow meter, and an electric regulating valve are installed on the pipelines. The biochemical reaction section includes one anoxic biological treatment tank and three aerobic tanks, connected by water passages. An aeration disc is installed in each aerobic tank, and oxygen is supplied to the aeration discs via an aerobic blower. A membrane tank is located next to the aerobic tank furthest from the anoxic biological treatment tank. The membrane tank contains a level gauge and an MBR membrane, and is connected to the anoxic tank via an internal reflux control system to form a reflux.

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