Device and method for measuring water distribution uniformity of sludge reactor

Abstract

The application discloses a water distribution uniformity measuring device for a sludge reactor, which comprises a water inlet device, a water inlet pump, a water distributor, a small automatic conductivity monitor, a sequencing batch bioreactor and a micro electrode probe, the water inlet device is connected with the water inlet pump through a pipeline, the water inlet pump is connected with the water distributor through a pipeline, and the water distributor is located below the liquid level of the sequencing batch bioreactor; the small automatic conductivity monitor is adjustably arranged above the sequencing batch bioreactor; the water inlet pump and the small automatic conductivity monitor are connected with a programmable controller; the micro electrode probe is arranged in the sequencing batch bioreactor as an external device to measure conductivity, and the micro electrode probe is connected with the small automatic conductivity monitor through a wire. The application also provides a water distribution uniformity measuring method for a sludge reactor. The application can determine the water distribution uniformity, optimize sludge screening and guarantee efficient and stable operation of wastewater treatment.

Description

Technical Field

[0001] The invention belongs to the technical field of sewage treatment, and in particular relates to a device and method for measuring water distribution uniformity of a sludge reactor. Background Art

[0002] The sludge reactor is a core component of the wastewater treatment system, and its water distribution uniformity directly impacts the treatment results. When cultivating aerobic sludge, uniform water distribution in the reactor can optimize the selection of the desired sludge microbial community structure. Water distribution uniformity is of great significance to the sequencing batch sludge reactor (SBR), mainly reflected in the following aspects:

[0003] First, the impact on treatment effect

[0004] 1. Improved organic matter removal efficiency: SBR processes wastewater through alternating anaerobic and aerobic phases. Uniform water distribution ensures that organic matter in the wastewater is evenly distributed within the reactor, allowing for full contact between the activated sludge and wastewater, thereby improving organic matter removal efficiency.

[0005] 2. Enhanced nitrogen and phosphorus removal: In SBR, the denitrification and phosphorus removal processes require specific environmental conditions and microbial activity. Uniform water distribution helps maintain the stability of the anoxic, anaerobic, and aerobic environments within the reactor, promoting the growth and metabolism of microorganisms such as nitrifying bacteria, denitrifying bacteria, and phosphate-accumulating bacteria, thereby improving nitrogen and phosphorus removal.

[0006] Second, the impact on the performance of activated sludge

[0007] 1. Maintain the stability of activated sludge: Uniform water distribution can avoid excessive or low load in local areas, prevent the loss or expansion of activated sludge, and maintain the stability of the structure and performance of activated sludge.

[0008] 2. Promote the growth and metabolism of microorganisms: Uniform water distribution can provide a stable living environment for microorganisms, which is conducive to the growth and reproduction of microorganisms, improve the activity and metabolic capacity of microorganisms, and thus enhance the activated sludge's ability to treat sewage.

[0009] Third, the impact on operating costs

[0010] 1. Reduce energy consumption: Water distribution uniformity can reduce short-circuit and dead zone phenomena in the reactor, improve the effective volume utilization of the reactor, and reduce the energy consumption of stirring and aeration.

[0011] 2. Reduce the dosage of chemicals: By improving treatment effect and reducing sludge production, water distribution uniformity can reduce the dosage of chemical agents, such as flocculants, disinfectants, etc., thereby reducing operating costs.

[0012] Fourth, impact on reactor design and operation

[0013] 1. Optimize reactor design: When designing SBR, it is necessary to consider the requirements for water distribution uniformity and reasonably design the water inlet, outlet and stirring device to ensure uniform distribution of sewage in the reactor.

[0014] 2. Easy operation and management: Water distribution uniformity helps to simplify the operation and management process, reduce the workload and difficulty of operators, and improve the efficiency and reliability of operation and management.

[0015] Water distribution uniformity is crucial to the efficient and stable operation of the SBR, directly affecting treatment results, operational stability, and energy consumption. Therefore, uniform water distribution should be ensured during design and operation to achieve optimal treatment results. Summary of the Invention

[0016] In order to overcome the problems of strong subjectivity and low efficiency in existing technologies that rely on manual observation and empirical judgment, making it difficult to meet actual engineering needs, and to overcome the problem of water distribution uniformity in existing aerobic sludge treatment operations, the present invention provides a water distribution uniformity measurement device and method for a sludge reactor. The device can measure the conductivity of a conductive medium solution at different positions in the reactor, calculate the conductivity variance of the solution at different positions, determine the water distribution uniformity, optimize sludge screening, and ensure efficient and stable operation of sewage treatment.

[0017] The technical solution adopted by the present invention to solve its technical problem is:

[0018] A device for measuring water distribution uniformity of a sludge reactor comprises a water inlet device, a water inlet pump, a water distributor, a small automatic conductivity monitor, a sequencing batch bioreactor and a micro-electrode probe, wherein the water inlet device is connected to the water inlet pump via a pipeline, the water inlet pump is connected to the water distributor via a pipeline, and the water distributor is located below the liquid level of the sequencing batch bioreactor; the small automatic conductivity monitor is installed above the sequencing batch bioreactor with an adjustable working position; the water inlet pump and the small automatic conductivity monitor are connected to a programmable controller; the micro-electrode probe is placed inside the sequencing batch bioreactor as an external device to measure conductivity, and the micro-electrode probe is connected to the small automatic conductivity monitor via a wire.

[0019] Furthermore, 5-15 micro-electrode probes are installed inside the sequencing batch bioreactor, and the electrode probes are arranged using a polar coordinate method to measure the liquid conductivity values ​​at different positions.

[0020] In the water distributor, water outlet holes are evenly distributed on both sides and the top of the water distribution pipe, and are immersed below the sludge liquid level of the reactor for cultivating sludge.

[0021] A conductive medium salt solution of known concentration is added into the water inlet device.

[0022] Preferably, the conductive medium salt solution is sodium chloride solution, potassium chloride solution, copper sulfate solution or sodium sulfate solution, with a concentration range of 0.01 mol·L -1 to 1.0 mol·L -1 .

[0023] A method for measuring water distribution uniformity of a sludge reactor comprises the following steps:

[0024] 1) Determine the center and radius: Set the center to (0,0) and the radius to R;

[0025] 2) Calculate the angle interval: Divide the 360° circle into n equal parts, each part

[0026] 3) Calculate the position coordinates of the microelectrode probe:

[0027] Point 1:

[0028] Point 2:

[0029] …

[0030] The nth point:

[0031] 4) The calculation formula for the uniformity of water distribution in the reactor uses sample variance to estimate the degree of dispersion between each point in the sample data and the sample mean. The calculation formula is:

[0032] 5) When using conductivity measurement analysis, set n conductivity probes at the same height and measure the conductivity between probes 1# to n#. The calculation formula for the conductivity variance of n samples is: If the variance is less than 0.05, the water distribution uniformity is considered good; if it is greater than 0.1, the water distribution uniformity is considered average; if it exceeds 0.2, the water distribution uniformity is considered poor; the micro-electrode probe measures the water distribution uniformity at different heights of the reactor, and the total variance of the sample variance values ​​at different heights is calculated again based on the water distribution uniformity at different heights. The calculation formula is: m=4, indicating the number of different heights. When it is less than 0.1, the overall water distribution uniformity is considered to be excellent; when it is greater than 0.1, the overall water distribution uniformity is considered to be good; and when it exceeds 0.2, the overall water distribution uniformity is considered to be poor.

[0033] Preferably, in step 5), the microelectrode probe measures the water distribution uniformity at four different heights of the reactor, namely, at distances from the bottom of 1 / 4, 2 / 4, 3 / 4, and 4 / 4 of the total height H of the reactor. Of course, different numbers of different heights can also be used.

[0034] The beneficial effects of the present invention are primarily manifested in the following: when a conductive medium solution of known concentration is added to the water inlet device and fed into the reactor via a water inlet pump connected to a water distributor, the conductivity of the liquid at different locations in the reactor is measured, and the uniformity of the water distribution is determined through data analysis. A small automated conductivity monitor is used to extract water samples at different liquid levels within the reactor, and the conductivity is measured using a microelectrode probe. The conductivity values ​​at different locations within the reactor are analyzed to determine the uniformity of the reactor water distribution. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 This is a schematic diagram of the overall device of the present invention, wherein: 1 water inlet device, 2 water inlet pump, 3 programmable controller, 4 small automatic conductivity monitor, 5 sequencing batch bioreactor, 6 water distributor, 7 micro electrode probe.

[0036] Figure 2 Schematic diagram of the placement of the microelectrode probe. DETAILED DESCRIPTION

[0037] The present invention will be further described below with reference to the accompanying drawings.

[0038] Reference Figure 1 and Figure 2 A device for measuring water distribution uniformity of a sludge reactor includes a water inlet device 1, which is connected to a water inlet pump 2 through a silicone hose with an inner diameter of 4 mm, and the water inlet pump 2 is connected to a water distributor 6 through a silicone hose; a small automatic conductivity monitor 4 is placed above a sequencing batch bioreactor 5; the water inlet pump 2 and the small automatic conductivity monitor 4 are connected to a programmable controller 3; the conductivity display screen is set within the working range of the small automatic conductivity monitor 4, and a microelectrode probe 7 is inside the sequencing batch bioreactor.

[0039] Furthermore, 5-15 micro-electrode probes are installed inside the sequencing batch bioreactor, and the electrode probes are arranged using a polar coordinate method to measure the liquid conductivity values ​​at different positions.

[0040] In the water distributor, water outlet holes are evenly distributed on both sides and the top of the water distribution pipe, and are immersed below the sludge liquid level of the reactor for cultivating sludge.

[0041] A conductive medium salt solution of known concentration is added into the water inlet device.

[0042] Preferably, the conductive medium salt solution is sodium chloride solution, potassium chloride solution, copper sulfate solution or sodium sulfate solution, with a concentration range of 0.01 mol·L -1 to 1.0 mol·L -1 .

[0043] A method for measuring water distribution uniformity of a sludge reactor comprises the following steps:

[0044] 1) Determine the center and radius: Set the center to (0,0) and the radius to R;

[0045] 2) Calculate the angle interval: Divide the 360° circle into n equal parts, each part

[0046] 3) Calculate the position coordinates of the microelectrode probe:

[0047] Point 1:

[0048] Point 2:

[0049] …

[0050] The nth point:

[0051] 4) The calculation formula for the uniformity of water distribution in the reactor uses sample variance to estimate the degree of dispersion between each point in the sample data and the sample mean. The calculation formula is:

[0052] 5) When using conductivity measurement analysis, set n conductivity probes at the same height and measure the conductivity between probes 1# to n#. The calculation formula for the conductivity variance of n samples is: If the variance is less than 0.05, the water distribution uniformity is considered good; if it is greater than 0.1, the water distribution uniformity is considered average; if it exceeds 0.2, the water distribution uniformity is considered poor; the micro-electrode probe measures the water distribution uniformity at different heights of the reactor, that is, at a distance from the bottom of 1 / 4, 2 / 4, 3 / 4, and 4 / 4 of the total height H of the reactor. The total variance of the sample variance values ​​at different heights is calculated again based on the water distribution uniformity at different heights. The calculation formula is: m=4, indicating the number of different heights. When it is less than 0.1, the overall water distribution uniformity is considered to be excellent; when it is greater than 0.1, the overall water distribution uniformity is considered to be good; and when it exceeds 0.2, the overall water distribution uniformity is considered to be poor.

[0053] In this embodiment, a water distributor 6 is fixedly mounted below the liquid level of the sequencing batch bioreactor 5. A small automated conductivity monitor 4 is installed above the sequencing batch bioreactor 5. A programmable controller 3 controls the operation of the water inlet pump 2, which delivers saline solution from the water inlet device 1 to the water distributor 6, distributing water below the liquid level of the sequencing batch bioreactor 5. At this point, the programmable controller 3 controls the small automated conductivity monitor 4 to measure the conductivity at different liquid level positions within the sequencing batch bioreactor 5. Once water has reached the top of the sequencing batch bioreactor 5, the small automated conductivity monitor 4 is turned on and the panel reading is read. The temperature is controlled at approximately 20°C, and a microelectrode probe 7 is inserted to measure conductivity. Conductivity values ​​are measured at 10 cm, 20 cm, 30 cm, and 40 cm from the bottom of the reactor. The results are statistically analyzed, and the sample conductivity variance is calculated using computer software to analyze the uniformity of water distribution.

[0054] First, add a concentration of 0.1 mol·L -1 Sodium chloride (NaCl) solution, use a plastic water inlet bucket to fill the prepared solution, turn on the adjustable speed water inlet pump 2 (using a peristaltic pump), and set the speed to 500ml min -1 , a silicone hose with an inner diameter of 4mm is used to connect and send the liquid in the water inlet device 1 into the sequencing batch bioreactor 6. The reactor used in this example has a height-to-diameter ratio (H / D) of 3, a height of 40cm, a diameter of 13cm, and an effective volume of approximately 5.1L. The entire system operation process is controlled by a programmable controller 3. A small automated conductivity monitor 4 is used to connect a microelectrode probe 6 to the reactor. The electrode probe is placed at the following positions in the rectangular coordinate system: (6.5, 0)(2.01, 6.18)(-5.25, 3.82)(-5.25, -3.82)(2.01, -6.18). The measured sample data are numbered T1, T2, T3, T4, and T5.

[0055] The total variance of the calculated samples is 0.009517. The detailed analysis is shown in Table 1. The overall water distribution uniformity is excellent.

[0056]

[0057] Table 1

[0058] The embodiments of this specification are merely examples of implementations of the invention and are provided for illustrative purposes only. The scope of protection of the present invention should not be considered limited to the specific embodiments described in these embodiments. The scope of protection of the present invention also extends to equivalent technical means that can be conceived by a person of ordinary skill in the art based on the invention.

Claims

1. A method for measuring water distribution uniformity of a sludge reactor, characterized in that: The device for measuring water distribution uniformity of a sludge reactor for implementing the method comprises a water inlet device, a water inlet pump, a water distributor, a small automatic conductivity monitor, a sequencing batch bioreactor, and a microelectrode probe. The water inlet device is connected to the water inlet pump via a pipeline, the water inlet pump is connected to the water distributor via a pipeline, and the water distributor is located below the liquid level of the sequencing batch bioreactor. The small automatic conductivity monitor is adjustable in working position and installed above the sequencing batch bioreactor. The water inlet pump and the small automatic conductivity monitor are connected to a programmable controller. The microelectrode probe is placed inside the sequencing batch bioreactor as an external device to measure conductivity, and the microelectrode probe is connected to the small automatic conductivity monitor via a wire. The measuring method comprises the following steps: 1) Determine the center and radius of the circle: Let the center be (0, 0) and the radius be R; 2) Calculate the angle interval: Divide the 360° circle into n equal parts, each part °; 3) Calculate the position coordinates of the microelectrode probe: Point 1: ( R cos(0°), R sin(0°) Point 2: ( R cos( °), R sin( °)) …… The nth point: R cos( °), R sin( °)); 4) The calculation formula for the reactor water distribution uniformity uses sample variance to estimate the degree of dispersion between each point in the sample data and the sample mean. The calculation formula is: ; 5) When using conductivity measurement analysis, set n conductivity probes at the same height and measure the conductivity between probes 1# to n#. The calculation formula for the conductivity variance of n samples is: If the variance is less than 0.05, the water distribution uniformity is considered good; if it is greater than 0.1, the water distribution uniformity is considered average; if it exceeds 0.2, the water distribution uniformity is considered poor; the micro-electrode probe measures the water distribution uniformity at different heights of the reactor, and the total variance of the sample variance values ​​at different heights is calculated again based on the water distribution uniformity at different heights. The calculation formula is: , m=4, represents the number of different heights. When it is less than 0.1, the total water distribution uniformity is considered to be excellent, when it is greater than 0.1, the total water distribution uniformity is considered to be good, and when it exceeds 0.2, the total water distribution uniformity is considered to be poor.

2. The method for measuring water distribution uniformity according to claim 1, wherein: In step 5), the microelectrode probe measures the water distribution uniformity at four different heights of the reactor, namely, at distances from the bottom of 1 / 4, 2 / 4, 3 / 4, and 4 / 4 of the total height H of the reactor.

3. The method for measuring water distribution uniformity according to claim 1, wherein: 5-15 micro-electrode probes are installed inside the sequencing batch bioreactor, and the electrode probes are arranged using a polar coordinate method to measure the liquid conductivity values ​​at different positions.

4. The method for measuring water distribution uniformity according to claim 1 or 3, wherein: In the water distributor, water outlet holes are evenly distributed on both sides and the top of the water distribution pipe, and are immersed below the sludge liquid level of the reactor for cultivating sludge.

5. The method for measuring water distribution uniformity according to claim 1 or 3, wherein: A conductive medium salt solution of known concentration is added into the water inlet device.

6. The method for measuring water distribution uniformity according to claim 5, wherein: The conductive medium salt solution is sodium chloride solution, potassium chloride solution, copper sulfate solution or sodium sulfate solution, and the concentration range is 0.01 mol·L -1 to 1.0 mol·L -1 .

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