Device and method for measuring water distribution uniformity of sludge reactor

Abstract

A water distribution uniformity measuring device 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, 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 small automatic conductivity monitor is connected with the sequencing batch bioreactor through a pipeline. The water distributor is positioned below the liquid level of the sequencing batch bioreactor; the small-sized automatic conductivity monitor is arranged above the sequencing batch bioreactor in a manner that the working position of the small-sized automatic conductivity monitor can be adjusted; the water inlet pump and the small automatic conductivity monitor are connected with the programmable controller; the micro electrode probe is used as external equipment and is placed in the sequencing batch bioreactor to measure the conductivity, and the micro electrode probe is connected with the small-sized automatic conductivity monitor through a wire. The invention also provides a method for measuring the water distribution uniformity of the sludge reactor. The water distribution uniformity is determined, sludge screening is optimized, and efficient and stable operation of sewage treatment is guaranteed.

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 the core equipment in the sewage treatment system, and its water distribution uniformity directly affects the sewage treatment effect. When cultivating aerobic sludge, uniform water distribution in the reactor can optimize the screening of the required sludge microbial community structure. Water distribution uniformity is of great significance to the sequencing batch activated sludge reactor (SBR), mainly reflected in the following aspects:

[0003] First, the impact on the treatment effect

[0004] 1. Improve the removal efficiency of organic matter: SBR treats sewage by alternating between anaerobic and aerobic stages. Even water distribution ensures that the organic matter in the sewage is evenly distributed in the reactor, allowing the activated sludge to fully contact the sewage, thereby improving the removal efficiency of organic matter.

[0005] 2. Enhance the effect of nitrogen removal and phosphorus removal: In SBR, the process of nitrogen removal and phosphorus removal requires specific environmental conditions and microbial action. Water distribution uniformity helps to maintain the stability of the anoxic, anaerobic and aerobic environment in the reactor, promotes the growth and metabolism of microorganisms such as nitrifying bacteria, denitrifying bacteria and polyphosphate bacteria, thereby improving the effect of nitrogen removal 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: Uniform water distribution 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 the treatment effect and reducing the sludge output, the uniformity of water distribution can reduce the dosage of chemical agents, such as flocculants, disinfectants, etc., thereby reducing operating costs.

[0012] Fourth, the 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 operation difficulty of operators, and improve the efficiency and reliability of operation and management.

[0015] The uniformity of water distribution is crucial to the efficient and stable operation of SBR, and directly affects the treatment effect, operation stability and energy consumption. Therefore, the uniformity of water distribution should be ensured during design and operation to achieve the best treatment effect. Summary of the invention

[0016] In order to overcome the problems that the existing technology relies on manual observation and experience judgment, has strong subjectivity, low efficiency and other problems, and is difficult to meet the actual needs of the project, and in order to overcome the problem of water distribution uniformity in the operation of the existing aerobic sludge treatment, the present invention provides a water distribution uniformity measuring device and method for a sludge reactor, which can determine the water distribution uniformity by measuring the conductivity of the conductive medium solution at different positions in the reactor, calculate the conductivity variance of the solution at different positions, optimize the sludge screening, and ensure the efficient and stable operation of the 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 through a pipeline, the water inlet pump is connected to 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 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 through a wire.

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

[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 the 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, and the concentration range is 0.01 mol·L -1 To 1.0 mol·L -1 .

[0023] A method for determining 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 circumference of 360° into n parts, each part

[0026] 3) Calculate the position coordinates of the micro-electrode probe:

[0027] Point 1:

[0028] The second point:

[0029] …

[0030] The nth point:

[0031] 4) The calculation formula for the uniformity of water distribution in the reactor uses the 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 and analysis, n conductivity probes are set at the same height to 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 a distance from the bottom of 1 / 4, 2 / 4, 3 / 4, and 4 / 4 of the total height H of the reactor. Of course, it can also be divided into different numbers of different heights.

[0034] The beneficial effects of the present invention are mainly manifested in that when a conductive medium solution of known concentration is added to the water inlet device and connected to the water distributor through the water inlet pump to enter the reactor, the conductivity of the liquid at different positions of the reactor is measured to be different, and the uniformity of water distribution is determined through data analysis. Water samples at different liquid levels in the reactor are extracted through a small automatic conductivity monitor, and the conductivity is measured with a micro-electrode probe, and the conductivity values ​​at the positions in the reactor are analyzed to determine the uniformity of water distribution in the reactor. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 The overall device schematic diagram of the present invention includes: 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 in conjunction with the accompanying drawings.

[0038] Reference Figure 1 and Figure 2 A device for measuring water distribution uniformity of a sludge reactor comprises a water inlet device 1, the water inlet device 1 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; a conductivity display screen is arranged 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 to measure the liquid conductivity values ​​at different positions using a polar coordinate method.

[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 the 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, and the concentration range is 0.01 mol·L -1 To 1.0 mol·L -1 .

[0043] A method for determining 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 circumference of 360° into n parts, each part

[0046] 3) Calculate the position coordinates of the micro-electrode probe:

[0047] Point 1:

[0048] The second point:

[0049] …

[0050] The nth point:

[0051] 4) The calculation formula for the uniformity of water distribution in the reactor uses the 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 and analysis, n conductivity probes are set at the same height to 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 good; if it is greater than 0.1, the water distribution uniformity is average; if it exceeds 0.2, the water distribution uniformity is 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, the water distributor 6 is fixed below the liquid level of the sequencing batch bioreactor 5, and a small automatic conductivity monitor 4 is installed above the sequencing batch bioreactor 5. The water inlet pump 2 is controlled by the programmable controller 3 to input the salt solution in the water inlet device 1 into the water distributor 6, and water is distributed below the liquid level of the sequencing batch bioreactor 5; at this time, the small automatic conductivity monitor 4 is controlled by the programmable controller 3 to measure the conductivity at different liquid level height positions in the sequencing batch bioreactor 5. When waiting for the sequencing batch bioreactor 5 to be filled with water to the top of the reactor, the small automatic conductivity detector 4 is turned on to read the panel value. The temperature is controlled at about 20°C, and the micro-electrode probe 7 is placed to measure the conductivity. The conductivity values ​​are measured at the positions of 10cm, 20cm, 30cm, and 40cm from the bottom of the reactor, and the statistical results are calculated. The sample conductivity variance is calculated by 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 4 mm is used to connect the liquid in the water inlet device 1 to the sequencing batch bioreactor 6. The reactor used in this example is a reactor with a height-to-diameter ratio (H / D) of 3, a height of 40 cm, a diameter of 13 cm, and an effective volume of about 5.1 L. The entire system operation process is controlled by a programmable controller 3, and a small automatic conductivity monitor 4 is used to connect a micro-electrode probe 6 to the reactor. The electrode probe is placed at the rectangular coordinate system: (6.5, 0) (2.01, 6.18) (-5.25, 3.82) (-5.25, -3.82) (2.01, -6.18), and the sample data numbers are T1, T2, T3, T4, and T5.

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

[0056]

[0057] Table 1

[0058] The contents described in the embodiments of this specification are merely enumerations of implementation forms of the inventive concept and are for illustrative purposes only. The protection scope of the present invention should not be considered to be limited to the specific forms described in this embodiment, and the protection scope of the present invention also extends to equivalent technical means that can be thought of by ordinary technicians in this field based on the inventive concept.

Claims

1. A device for measuring water distribution uniformity of a sludge reactor, characterized in that: It includes 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 through a pipeline, the water inlet pump is connected to 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 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 through a wire.

2. The device for measuring water distribution uniformity of a sludge reactor according to claim 1, characterized in that: 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.

3. The device for measuring water distribution uniformity of a sludge reactor according to claim 1 or 2, characterized in that: 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 the sludge.

4. The device for measuring water distribution uniformity of a sludge reactor according to claim 1 or 2, characterized in that: A conductive medium salt solution of known concentration is added into the water inlet device.

5. The device for measuring water distribution uniformity of a sludge reactor according to claim 4, characterized in that: 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 .

6. A method implemented by the device for measuring water distribution uniformity of a sludge reactor as claimed in claim 1, characterized in that: The determination method comprises the following steps: 1) Determine the center and radius: Set the center to (0,0) and the radius to R; 2) Calculate the angle interval: Divide the circumference of 360° into n parts, each part 3) Calculate the position coordinates of the micro-electrode probe: Point 1: The second point: …… The nth point: 4) The calculation formula for the uniformity of water distribution in the reactor uses the 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 and analysis, n conductivity probes are set at the same height to 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.

7. The method according to claim 6, characterized in that In the step 5), the microelectrode probe measures the water distribution uniformity at four different heights of the reactor, namely, at a distance from the bottom of 1 / 4, 2 / 4, 3 / 4, and 4 / 4 of the total height H of the reactor.

Images