A fully automatic adjusting high-efficiency bacteria strain processing sewage device

Abstract

The utility model discloses a kind of high-efficiency bacterial species processing sewage devices of full-automatic adjustment, it is related to sewage treatment technical field.The device includes adjusting pool, SBR reaction pool, aeration unit, dosing unit and control unit.Aeration unit uses butterfly type jetting aeration disc and aeration fan, and is equipped with on-line dissolved oxygen analyzer;Dosing unit includes methanol dosing pump and alkali pump, respectively for adding carbon source and adjusting pH;Control unit automatically adjusts the operation frequency and start-stop of aeration fan according to on-line monitoring data, controls the start-stop of methanol dosing pump and alkali pump.By real-time monitoring dissolved oxygen, COD, ammonia nitrogen and pH and the like parameters, realize the automatic switching and accurate control of aeration, stirring, precipitation and drainage process, effectively stabilize reaction environment, inhibit nitrite oxidizing bacteria activity, reduce oxygen and carbon source consumption, improve denitrification efficiency and treatment effect, while reduce energy consumption and operating cost.

Description

Technical Field

[0001] This utility model relates to wastewater treatment technology, and in particular to a fully automatic, high-efficiency microbial treatment device for wastewater. Background Technology

[0002] The SBR process, also known as the intermittent aerated activated sludge process or the sequencing batch activated sludge process, is a widely used wastewater treatment process in the chemical industry. However, with the continuous evolution of chemical processes, the composition of wastewater is becoming increasingly complex, and the scale of single chemical systems is constantly expanding, requiring ever-increasing wastewater treatment capacity.

[0003] Traditional activated sludge bacteria strains have poor adaptability to complex wastewater, and the nitrification-denitrification process is slow, resulting in long treatment cycles and high energy consumption. During aeration, the dissolved oxygen (DO) concentration fluctuates greatly, easily causing the activity of nitrite-oxidizing bacteria (NOB) to recover, leading to over-nitrification and increased oxygen and carbon source consumption. Carbon source addition during the denitrification stage relies on experience and lacks real-time monitoring, easily resulting in carbon source waste or insufficiency, affecting nitrogen removal efficiency. During nitrification, acid production and pH drops affect bacterial activity; traditional artificial alkali addition methods cannot achieve a rapid response, leading to an unstable reaction environment.

[0004] Therefore, there is a need for further improvements to the existing technology. Utility Model Content

[0005] Based on the above-mentioned technical problems, this utility model proposes a fully automatic adjustable high-efficiency bacterial strain treatment device for sewage.

[0006] The technical solution of this utility model is implemented as follows: A fully automated, high-efficiency microbial inoculum treatment device, characterized in that it comprises: Equalization tanks are used to receive and pre-treat wastewater; The SBR reactor is connected to the equalization tank via an equalization tank transfer pump; The aeration unit includes a butterfly-type jet aeration disc located at the bottom of the SBR reactor, an aeration blower connected to the aeration disc, and an online dissolved oxygen analyzer for monitoring the dissolved oxygen concentration in the reactor. The dosing unit includes a methanol storage tank and a methanol dosing pump for adding a carbon source, and an alkali storage tank and an alkali dosing pump for adjusting the pH. The control unit is connected to the online dissolved oxygen analyzer, aeration fan, methanol dosing pump, and alkali dosing pump via signal connections. The control unit is configured to: adjust the operating frequency and start / stop of the aeration blower, control the start / stop of the methanol dosing pump, and control the start / stop of the alkali dosing pump.

[0007] In this invention, the regulating tank includes a regulating tank for treating wastewater from the chemical plant area and a regulating tank for treating wastewater from the residential area.

[0008] In this invention, when the dissolved oxygen concentration is > 4.5 mg / L, the operating frequency of the aeration blower is controlled to decrease by 10% every half hour; when the dissolved oxygen concentration is < 2 mg / L, the operating frequency of the aeration blower is controlled to increase by 10% every half hour.

[0009] In this invention, when the SBR reactor level reaches a high level and the ammonia nitrogen concentration is > 5 mg / L and the COD concentration is < 80 mg / L, the methanol dosing pump is turned on; when the COD concentration is > 120 mg / L, the methanol dosing pump is turned off.

[0010] In this invention, the alkali pump is turned on when the aeration blower is turned on and the pH is < 7.2; the alkali pump is turned off when the pH reaches 7.8.

[0011] In this invention, the high-efficiency bacterial strain wastewater treatment device also includes a circulating pump for mixing the reaction liquid, which remains on during both the aeration and stirring processes.

[0012] In this invention, the effective bacteria wastewater treatment device further includes a decanter, which is used to drain water at a first frequency after the sedimentation process and to rise and reset at a second frequency higher than the first frequency.

[0013] In this invention, the first frequency is 35Hz and the drainage time is 35-40 minutes; the second frequency is 50Hz and the rise and reset time is 19 minutes.

[0014] In this invention, the high-efficiency microbial wastewater treatment device also includes a sludge transfer pump for discharging sludge during the aeration process of the SBR reactor.

[0015] In this invention, the dosing unit further includes a phosphate dosing device for adding phosphate to the SBR reactor in each batch of influent, so that the total phosphorus concentration in the reactor is controlled at around 0.2 mg / L.

[0016] The fully automatic, high-efficiency microbial inoculum treatment device of this invention has the following beneficial effects: Real-time monitoring using an online dissolved oxygen analyzer enables coordinated control of the operating frequency and start / stop of high-efficiency aeration blowers. This ensures that the dissolved oxygen concentration remains stable within a suitable range during the nitrification stage, meeting the requirements for short-cut nitrification while preventing excessively high dissolved oxygen levels from causing the NOB bacteria to regain activity.

[0017] The system uses data from online COD and ammonia nitrogen meters to logically control the start and stop of the methanol dosing pump. It precisely adds methanol only when the carbon-to-nitrogen ratio is insufficient, ensuring efficient denitrification while avoiding carbon source waste.

[0018] By using an online pH meter and interlocking control of the alkali pump, the acidity generated during the reaction is automatically neutralized, providing an optimal and stable pH environment for high-efficiency bacterial strains.

[0019] Based on feedback from online water quality instruments, the system automatically determines and switches between processes such as aeration, mixing, sedimentation, or drainage. For example, when the ammonia nitrogen level is detected to drop to a set threshold, aeration is automatically stopped and the mixing stage begins, achieving precise control based on treatment effectiveness. Attached Figure Description

[0020] Figure 1 This is a reaction state diagram of the high-efficiency bacterial strain wastewater treatment device of this utility model; Figure 2 This is another reaction state diagram of the high-efficiency bacterial strain wastewater treatment device of this utility model; Figure 3 This is a schematic diagram of the structure of the high-efficiency bacterial strain wastewater treatment device of this utility model; Figure 4 This is a schematic diagram of the structure of the high-efficiency bacterial strain wastewater treatment device of this utility model; Figure 5 This is a schematic diagram of the structure of the high-efficiency bacterial strain wastewater treatment device of this utility model; Figure 6 This is a schematic diagram of the structure of the high-efficiency bacterial strain wastewater treatment device of this utility model.

[0021] The attached diagram is labeled as follows: equalization tank 1, equalization tank transfer pump 11, aeration blower 2, methanol storage tank 3, methanol dosing pump 31, circulation pump 4, alkali storage tank 5, alkali dosing pump 51, SBR tank 6, sludge transfer pump 7, disc aeration disc 8, bacterial culture 9, decanter 10. Detailed Implementation

[0022] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention.

[0023] like Figures 1 to 3As shown, wastewater from the chemical plant area and wastewater from the living area are sent to equalization tanks A and B respectively for pretreatment. The wastewater from the chemical plant area undergoes sedimentation and filtration to remove suspended solids, heavy metals, and some organic matter. Acid or alkali is then added to the wastewater to bring its pH close to neutral. The wastewater from the living area passes through a screen, grit chamber, and sedimentation tank to remove large particles and suspended solids, and then pathogens are eliminated using methods such as chlorination, ultraviolet light, or ozone. Subsequently, both the wastewater from the chemical plant area and the living area are sent to an SBR (Sequencing Batch Reactor) tank for further treatment. Finally, the wastewater treated in the SBR tank is discharged from the effluent tank and then filtered again in a filtration tank to complete the wastewater treatment process.

[0024] Specifically, such as Figures 4 to 6 As shown, this utility model's fully automatic, high-efficiency microbial inoculum treatment wastewater device includes an equalization tank 1. The equalization tank 1 consists of an equalization tank A containing wastewater from a chemical plant area and an equalization tank B containing wastewater from a residential area. The equalization tank 1 is connected to an equalization tank transfer pump 11, which delivers wastewater into an SBR tank 6. The SBR tank 6 is equipped with multiple butterfly-type jet aeration discs 8, and an aeration blower 2 is connected to these discs for aeration within the SBR tank 6.

[0025] In this embodiment, the specific operation steps are as follows: Step 1: Starting from the lowest liquid level, wastewater is filled into the equalization tank 1 until the highest water level is reached. Wastewater inflow can be divided into unrestricted aeration inflow and restricted aeration inflow. During the unrestricted aeration inflow period, the butterfly jet aeration disc 8 aerates simultaneously; during the restricted aeration inflow period, the butterfly jet aeration disc 8 does not aerate.

[0026] During the water intake cycle of equalization tank 1, this invention adopts an unrestricted aeration intake mode, meaning that during the water intake process, the butterfly-type ejector aeration disc 8 simultaneously begins aeration. Equalization tank 1 begins intake from its lowest level, with chemical wastewater and domestic wastewater entering equalization tanks A and B respectively, stopping at the highest level. Simultaneously with water intake, the high-efficiency aeration blower 2 and the high-efficiency circulating pump 4 are activated for aeration and mixing. The phosphorus source dosing pump runs for a certain period during the water intake phase to ensure a suitable carbon-nitrogen-phosphorus ratio. After water intake is complete, the intake pump and intake valve are closed.

[0027] Preferably, during the water intake process, the dissolved oxygen level cannot be maintained at a high level due to the adsorption of organic matter. Reducing the water intake process time can increase the effective aeration time, and the water intake stage should be carried out with a large volume of water as much as possible.

[0028] Step 2: Divided into three stages of aeration and two stages of stirring; Step 2.1: The first stage of aeration lasts for a fixed time of 3 hours, with the high-efficiency aeration blower 2 and the high-efficiency circulating pump 4 running continuously. After a 2-hour delay, the methanol dosing pump 31 is turned on for 30 minutes to add the carbon source; Step 2.2: During the first stage of stirring, the high-efficiency aeration blower 2 is turned off, while the high-efficiency circulating pump 4 continues to run, with stirring time of 60-90 minutes. Methanol dosing pump 31 continuously adds methanol for approximately 60 minutes, using the online nitrate nitrogen meter as a reference, to promote the denitrification reaction. Step 2.3: Second stage of aeration, the high-efficiency aeration blower 2 is restarted and aeration continues until the ammonia nitrogen value is <2 mg / L; Step 2.4: Second stage of stirring. High-efficiency aeration blower 2 is turned off, while high-efficiency circulating pump 4 continues to run. Stirring time is 20 minutes. Methanol dosing pump 31 adds methanol for 20 minutes to further degrade nitrate nitrogen. Step 2.5: Third stage aeration, fixed time 30 minutes, high-efficiency aeration blower 2 is turned on to settle the floating sludge and further degrade ammonia nitrogen to ensure that the effluent meets the standards; In this embodiment, the main reaction process of the SBR tank is an aeration-stirring process; the aeration process refers to the process of aerating the wastewater in the reaction tank. The aeration process can be performed continuously or intermittently as needed, and the time spent on aeration within one operating cycle is called the aeration time. The patented technology adopts a three-stage aeration mode, with the first stage of aeration lasting a fixed 3 hours, during which a certain amount of methanol is added.

[0029] After the first stage of aeration achieves a certain degree of nitrification, the first stage of mixing begins. Following the first stage of mixing, the second stage of aeration continues until the actual ammonia nitrogen value is <2 mg / L. The third stage of aeration is used to settle the floating sludge formed by the nitrogen gas generated during the second stage of mixing, while simultaneously completing further degradation of ammonia nitrogen to ensure compliance with standards (the aeration time for all three stages is fixed at 30 minutes).

[0030] The ammonia nitrogen reference standard at the end of the second stage of aeration: The stirring process refers to the denitrification process of the wastewater in the reaction tank. The stirring process can realize the rapid degradation reaction of nitrate and nitrite, achieving the removal of total nitrogen. The technology adopts a two-end stirring and three-stage aeration process in sequence; after the first stage of aeration, the stirring time is 60-90 minutes; the methanol addition time during the stirring process is about 60 minutes, and the reaction is referenced by the online nitrate nitrogen meter. The reference standard for the nitrate nitrogen value at the end of the first stage of stirring is shown in the figure below, and then the second stage of aeration can be started.

[0031] The second-stage stirring process is after the second-stage aeration, and the second-stage stirring process lasts for 20 minutes. The methanol addition time is also 20 minutes. During the first-stage stirring to the second-stage stirring process, the nitrate nitrogen will be further degraded and the reaction will be complete. After the nitrate nitrogen has reacted completely, the third-stage aeration process begins.

[0032] In the main process of SBR, the high-efficiency aeration blower 2 and the high-efficiency circulating pump 4 are turned on in the aeration process; the methanol dosing pump 31 in the first stage of aeration is turned on for 30 minutes after a 2-hour delay; in the mixing process, the high-efficiency aeration blower 2 is turned off, the high-efficiency circulating pump 4 continues to be turned on, and the methanol dosing pump 31 is turned on.

[0033] Step 3: After aeration stops, the high-efficiency bacteria strain 9 settles rapidly, forming a supernatant. The settling time is set to 10 minutes.

[0034] Among them, the high-efficiency bacterial sludge exhibits excellent settling performance, forming a high level of supernatant immediately after aeration ceases, with a settling time of no more than 2 minutes. Therefore, the settling process can be effectively reduced; the supernatant settling is essentially completed during the second-stage mixing process. The settling time is set to 10 minutes.

[0035] Step 4: Decanter 10 descends at a frequency of 35Hz, smoothly discharging the supernatant. The drainage time is about 35 to 40 minutes. After drainage is completed, decanter 10 rises at a frequency of 50Hz, taking about 19 minutes to return to the initial position.

[0036] Specifically, the process involves skimming off the supernatant after sedimentation down to the lowest water level in the reaction tank. The high-efficiency bacterial strain 9 exhibits excellent sedimentation performance, with no floating sludge in the supernatant. The decanter 10 operates at a descent frequency of 35Hz, resulting in a stable descent time of 30 minutes. Drainage is completed in 35-40 minutes, and the decanter 10 rises to a 50Hz frequency in 19 minutes.

[0037] Step 5: During the three-stage aeration, the sludge transfer pump (7) is turned on, and the sludge discharge time is 20-30 minutes. The SV30 value in the stabilization tank is 20%-24%. Adjust the sludge discharge time according to the relevant value, and set the sludge discharge time to 20-30 minutes. Sludge discharge is carried out during the three-stage aeration.

[0038] Step 6: The phosphorus content in the treated wastewater is too low, so a certain amount of phosphorus needs to be added to increase the carbon-nitrogen-phosphorus ratio to meet the needs of activated sludge. Phosphorus is added during each batch of influent, and the total phosphorus concentration in the reaction tank is controlled at around 0.2 mg / L after the addition of phosphorus.

[0039] Furthermore, in this embodiment, the regulating tank transfer pump 11 is automatically controlled according to the level gauge signal: it turns on when the liquid level is low and turns off when the liquid level is high. The SBR tank 6 inlet valve is also based on the liquid level interlock control.

[0040] The high-efficiency aeration blower 2 is connected to the butterfly-type jet aeration disc 8 to supply oxygen to the SBR tank 6. For example... Figure 6 As shown, the dissolved oxygen detector is used to monitor SBR tank 6. When DO > 4.5 mg / L, the frequency of aeration fan 2 decreases by 10% every half hour; when DO < 2 mg / L, the frequency of aeration fan 2 increases by 10% every half hour.

[0041] The methanol storage tank 3 is supplied with carbon source via methanol dosing pump 31. The methanol pump is turned on when the liquid level reaches the high level and ammonia nitrogen > 5 mg / L and COD < 80 mg / L; it is turned off when COD > 120 mg / L.

[0042] The pH of the alkali storage tank 5 is adjusted by the alkali addition pump 51. When the high-efficiency aeration blower 2 is turned on and the pH is < 7.2, the alkali addition pump is turned on; when the pH reaches 7.8, it is turned off.

[0043] Phosphate salts were added to each batch of influent, and the total phosphorus concentration was controlled at around 0.2 mg / L.

[0044] Online level gauge for SBR tank: Low level 5.35m to high level 6.1m, controls the start and stop of the equalization tank booster pump.

[0045] Furthermore, in the above embodiments, the traditional nitrification-denitrification process is as follows: The nitrification reaction is an aerobic process. During this stage, the aeration blower 2 provides sufficient oxygen. The reaction pathway is as follows: ammonia nitrogen NH4⁺-N → nitrite nitrogen NO2⁻-N, which is completed by ammonia-oxidizing bacteria AOB, consuming oxygen and producing acidity; nitrite nitrogen NO2⁻-N → nitrate nitrogen NO3⁻-N, which is completed by nitrite-oxidizing bacteria (NOB), continuing to consume a large amount of oxygen.

[0046] Denitrification is an anaerobic process; during this stage, aeration is stopped and stirring is performed. Denitrifying bacteria use a carbon source as an electron donor to gradually reduce nitrate nitrogen to nitrogen gas.

[0047] The reaction pathway is as follows: Nitrate nitrogen NO3⁻-N → Nitrite nitrogen NO2⁻-N, consuming the carbon source; Nitrite nitrogen NO2⁻-N → Nitrogen gas N2, continuing to consume the carbon source.

[0048] The entire process is complicated, resulting in high oxygen consumption, large carbon source addition, and long reaction time.

[0049] In this invention, by inhibiting the activity of nitrite-oxidizing bacteria (NOB), the nitrification reaction is controlled to stop after the initial stage, preventing the formation of nitrate nitrogen (NO3⁻-N). Nitrite nitrogen (NO2⁻-N), as an intermediate product, is directly reduced to nitrogen gas by denitrifying bacteria. The chemical reaction equation is as follows: Short-cut nitration: NH4⁺ + 1.5O2 → NO2⁻ + 2H⁺ + H2O; Short-range denitrification: 3NO2⁻+3H⁺→1.5N2↑+NO3⁻+3OH⁻, in which some nitrite nitrogen is directly converted into nitrogen gas or reacts with carbon sources.

[0050] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A fully automatic, high-efficiency microbial inoculum treatment device, characterized in that, include: Equalization tank (1) is used to receive and pre-treat sewage; The SBR reactor (6) is connected to the equalization tank (1) via the equalization tank transfer pump (11); The aeration unit includes a butterfly jet aeration disc (8) located at the bottom of the SBR reactor (6), an aeration blower (2) connected to the aeration disc (8), and an online dissolved oxygen analyzer for monitoring the dissolved oxygen concentration in the tank. The dosing unit includes a methanol storage tank (3) and a methanol dosing pump (31) for adding a carbon source, and an alkali storage tank (5) and an alkali dosing pump (51) for adjusting pH. The control unit is connected to the online dissolved oxygen analyzer, the aeration blower (2), the methanol dosing pump (31), and the alkali dosing pump (51) via signal connections. The control unit is configured to: adjust the operating frequency and start / stop of the aeration blower (2), control the start / stop of the methanol dosing pump (31), and control the start / stop of the alkali dosing pump (51).

2. The high-efficiency microbial wastewater treatment device according to claim 1, characterized in that, The equalization tank (1) includes an equalization tank for treating wastewater from the chemical plant area and an equalization tank for treating wastewater from the residential area.

3. The high-efficiency microbial wastewater treatment device according to claim 1, characterized in that, When the dissolved oxygen concentration is > 4.5 mg / L, the operating frequency of the aeration blower (2) is controlled to decrease by 10% every half hour; when the dissolved oxygen concentration is < 2 mg / L, the operating frequency of the aeration blower (2) is controlled to increase by 10% every half hour.

4. The high-efficiency microbial wastewater treatment device according to claim 1, characterized in that, When the liquid level of the SBR reactor (6) reaches the high level and the ammonia nitrogen concentration is > 5 mg / L and the COD concentration is < 80 mg / L, the methanol dosing pump (31) is turned on; when the COD concentration is > 120 mg / L, the methanol dosing pump (31) is turned off.

5. The high-efficiency microbial wastewater treatment device according to claim 1, characterized in that, When the aeration blower (2) is turned on and the pH is < 7.2, the alkali pump (51) is turned on; when the pH reaches 7.8, the alkali pump (51) is turned off.

6. The high-efficiency microbial wastewater treatment device according to claim 1, characterized in that, The high-efficiency bacterial strain wastewater treatment device also includes a circulation pump (4) for mixing the reaction liquid, which remains on during both the aeration and stirring processes.

7. The high-efficiency microbial wastewater treatment device according to claim 1, characterized in that, The effective bacteria wastewater treatment device also includes a decanter (10), which is used to drain water at a first frequency after the sedimentation process and to rise and reset at a second frequency higher than the first frequency.

8. The high-efficiency microbial wastewater treatment device according to claim 7, characterized in that, The first frequency is 35Hz, and the drainage time is 35-40 minutes; the second frequency is 50Hz, and the rise-reset time is 19 minutes.

9. The high-efficiency microbial wastewater treatment device according to claim 1, characterized in that, The high-efficiency microbial wastewater treatment device also includes a sludge transfer pump (7) for discharging sludge during the aeration process of the SBR reactor (6).

10. The high-efficiency microbial wastewater treatment device according to claim 1, characterized in that, The dosing unit also includes a phosphate dosing device for adding phosphate to the SBR reactor (6) in each batch of influent to control the total phosphorus concentration in the reactor at around 0.2 mg / L.

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