A sewage treatment system and control method based on electrodialysis

Abstract

The present invention belongs to the technical field of sewage treatment. The present invention provides a sewage treatment system and a control method based on electrodialysis, including: obtaining abnormal ion migration data of sewage during electrodialysis, and comparing it with the range interval of abnormal ion migration to obtain an analysis signal, obtaining an adjacent value of abnormal ion migration, and comparing it with an adjacent threshold of abnormal ion migration to obtain a re-analysis signal, processing to obtain a sharp change value according to the abnormal ion migration data, judging the change state of abnormal ion migration in unit time, generating a control signal, obtaining flow rate data of sewage during electrodialysis, constructing a flow rate change curve, processing to obtain a flow rate influence value, if the flow rate influence value is greater than or equal to the flow rate influence threshold, generating an influence signal, obtaining a flow rate control value, and controlling the flow rate of sewage during electrodialysis treatment based on the flow rate control value. The present invention is conducive to timely control when the sewage electrodialysis treatment is abnormal, so as to ensure the electrodialysis treatment quality of sewage.

Description

Technical Field

[0001] The invention belongs to the technical field of sewage treatment, and in particular to an electrodialysis-based sewage treatment system and a control method. Background Art

[0002] As an efficient wastewater treatment method, electrodialysis selectively separates and concentrates ions in wastewater through electric field effects. It has the advantages of high efficiency, good controllability, no need to add chemical reagents, and a wide range of applications. However, traditional electrodialysis systems still face problems such as low ion separation efficiency and unstable ion separation in practical applications. Therefore, it is of great significance to develop a new sewage treatment system and control method based on electrodialysis.

[0003] A Chinese patent application with publication number CN105481180A discloses a method and device for sewage treatment, including: performing anaerobic biological treatment on the sewage to obtain a sewage mixture; using a driving liquid to infiltrate water in the sewage mixture into the driving liquid through forward osmosis to obtain an extraction liquid; and separating the water in the extraction liquid through electrodialysis.

[0004] In the above-mentioned prior art, the extraction liquid is separated by electrodialysis, but there is a lack of monitoring of the separation and migration of ions during the electrodialysis process. The abnormal migration of ions will seriously affect the treatment quality of sewage or liquid, and there is also a lack of impact analysis of the abnormal migration and separation of ions during the electrodialysis process. It is impossible to determine the influencing factors and regulate the electrodialysis separation process according to the influencing factors. While the quality of electrodialysis treated sewage cannot be guaranteed, the electrodialysis operation steps during sewage treatment cannot be optimized.

[0005] To this end, the present invention provides a sewage treatment system based on electrodialysis and a control method. Summary of the invention

[0006] In order to make up for the deficiencies of the prior art, at least one technical problem raised in the background technology is solved.

[0007] The technical solution adopted by the present invention to solve the technical problem is: a control method for treating wastewater based on electrodialysis, comprising:

[0008] Real-time monitoring of abnormal ion migration data of sewage during electrodialysis, wherein the abnormal ion migration data includes the abnormal ion migration amount per unit time, and the abnormal ion migration data is compared with the constructed abnormal ion migration amount range interval to obtain an operation signal;

[0009] The operation signal includes a stop signal, an analysis signal and a running signal;

[0010] Based on the analysis signal, an ion abnormal migration proximity value is obtained, and the value is compared with an ion abnormal migration proximity threshold to obtain a processing signal, wherein the processing signal includes a control signal and a reanalysis signal;

[0011] Based on the reanalysis signal, according to the abnormal ion migration data, the change sharpness value is processed to determine the change state of the abnormal ion migration within a unit time according to the change sharpness value. If the change sharpness value is greater than or equal to the change sharpness threshold, it means that the abnormal ion migration state within a unit time changes sharply, and a control signal is generated;

[0012] Based on the control signal, the flow rate data of the sewage during electrodialysis is obtained, wherein the flow rate data includes the sewage flow rate value per unit time, a flow rate change curve is constructed based on the flow rate data, the flow rate change curve is processed and analyzed to obtain a flow rate influence value, the flow rate influence value is compared with a flow rate influence threshold, and if the flow rate influence value is greater than or equal to the flow rate influence threshold, an influence signal is generated;

[0013] Based on the influencing signal, a flow rate control value is obtained, and based on the flow rate control value, the flow rate during the sewage electrodialysis treatment is controlled.

[0014] As a further technical solution of the present invention, the abnormal ion migration amount is obtained by:

[0015] When sewage is subjected to electrodialysis, sensors are used to monitor in real time the amount of cations entering the electrodialysis anode chamber per unit time and the amount of anions entering the cathode chamber per unit time. The amount of cations entering the electrodialysis anode chamber per unit time and the amount of anions entering the cathode chamber per unit time are summed to obtain the amount of abnormal ion migration per unit time.

[0016] As a further technical solution of the present invention, the range of abnormal ion migration is constructed in the following manner:

[0017] Obtain the standard value of abnormal ion migration during electrodialysis sewage treatment and mark it as BZ, obtain the abnormal ion migration data of multiple historical sewage treatment processes, and screen out the maximum abnormal ion migration from the abnormal ion migration data of each sewage treatment process, sum and average the screened maximum abnormal ion migration amounts, obtain the maximum normal abnormal ion migration amount, and mark it as ZZ;

[0018] The abnormal ion migration amount range interval is constructed based on the abnormal ion migration amount standard value BZ and the maximum normal abnormal ion migration amount ZZ, wherein the abnormal ion migration amount range interval includes the normal migration amount interval and the migration amount analysis interval.

[0019] As a further technical solution of the present invention, the operation signal is generated in the following manner:

[0020] Obtaining the abnormal ion migration amount per unit time and comparing it with the constructed range of the abnormal ion migration amount;

[0021] If the abnormal migration amount of ions per unit time is within the normal migration amount range, an operation signal is generated;

[0022] If the abnormal migration amount of ions per unit time is within the migration amount analysis interval, an analysis signal is generated;

[0023] If the abnormal ion migration amount per unit time is neither within the normal migration amount interval nor within the migration amount analysis interval, a stop signal is generated.

[0024] As a further technical solution of the present invention, the processing signal is generated in the following manner:

[0025] Obtain the abnormal ion migration amount, perform difference processing on it and the standard value of the abnormal ion migration amount, and take the absolute value of the difference to obtain the abnormal ion migration amount deviation value, perform ratio processing on the abnormal ion migration amount deviation value and the standard value of the abnormal ion migration amount to obtain the abnormal ion migration approximate value;

[0026] comparing the ion abnormal migration proximity value with the ion abnormal migration proximity threshold;

[0027] If the ion abnormal migration proximity value is greater than or equal to the ion abnormal migration proximity threshold, a reanalysis signal is generated;

[0028] If the ion abnormal migration proximity value is less than the ion abnormal migration proximity threshold, a control signal is generated.

[0029] As a further technical solution of the present invention, the method for obtaining the sharp change value is:

[0030] The abnormal ion migration amount per unit time is marked in the XY coordinate system, and the marked data points of the abnormal ion migration amount per unit time are connected to obtain the abnormal ion migration change curve;

[0031] On the Y axis of the coordinate system, a straight line parallel to the X axis is drawn with the maximum abnormal migration of normal ions as the reference value, and it is marked as the maximum migration line;

[0032] The intersection of the abnormal ion migration change curve and the maximum migration line is marked as the over-limit point, and the over-limit point is connected with the mark point of the abnormal ion migration amount in the current unit time by a straight line to obtain a migration reference line;

[0033] Obtain the change time corresponding to the migration reference line, where the change time is the difference between the time points corresponding to the endpoints of the migration reference line on the X-axis;

[0034] The change time corresponding to the migration reference line is processed by ratio with the change time threshold to obtain the sharp time value, which is marked as Sj;

[0035] Marking a portion of the abnormal ion migration change curve between the over-limit point and the marking point of the abnormal ion migration amount in the current unit time as an over-limit curve;

[0036] The superboundary curve is divided into a number of superboundary sub-curves with equal horizontal lengths, and the slope value of the superboundary sub-curve is calculated according to the coordinates of the two end points of the sub-curve and the calculation formula of the straight line slope;

[0037] Compare the slope value of the superbound subcurve with the slope value of the migration reference line:

[0038] If the slope value of the superboundary subcurve is greater than or equal to the slope value of the migration reference line, then the superboundary subcurve is marked as a sharp subcurve;

[0039] Count the number of sharp sub-curves, perform ratio processing on the number of sharp sub-curves and the number of super-boundary sub-curves to obtain a sharpness value, which is marked as Cd;

[0040] The obtained sharp time value Sj and sharp degree value Cd are processed by data, and the formula is: The sharp change value JU is obtained, wherein s1 and s2 are both preset proportional coefficients.

[0041] As a further technical solution of the present invention, the flow velocity influence value is obtained by:

[0042] Obtain the sewage flow rate value per unit time, mark it in the XY coordinate system, connect the marked sewage flow rate value data points, and obtain a flow rate change curve;

[0043] The velocity variation curve is divided into a number of velocity sub-curves with equal horizontal lengths, wherein the horizontal length of the velocity sub-curve is equal to the horizontal length of the super-boundary sub-curve;

[0044] Integrate the velocity sub-curves and the super-boundary sub-curves with the same time points corresponding to the endpoints into a curve group;

[0045] In the curve group, take the midpoint of the velocity sub-curve, connect the midpoint of the velocity sub-curve with the two end points of the velocity sub-curve by straight lines, obtain the angle formed by the two connected straight lines, and mark it as the velocity angle. Similarly, take the midpoint of the superboundary sub-curve, connect the midpoint of the superboundary sub-curve with the two end points of the superboundary sub-curve by straight lines, obtain the angle formed by the two connected straight lines, and mark it as the superboundary angle.

[0046] Compare the opening direction of the velocity bend with the opening direction of the overbound bend:

[0047] If the opening direction of the velocity bend and the opening direction of the over-boundary bend are both upward or downward, their curve groups are marked as direction-synchronized curve groups;

[0048] Count the number of direction synchronization curve groups, perform ratio processing on the number of direction synchronization curve groups and the number of curve groups, and obtain the direction synchronization value;

[0049] The direction synchronization value and the change synchronization value are summed to obtain the flow velocity impact value.

[0050] As a further technical solution of the present invention, the method for obtaining the change synchronization value is:

[0051] In the directional synchronization curve group, the angle of the velocity bend angle and the angle of the over-boundary bend angle corresponding to the directional synchronization curve group are obtained, and the ratio processing is performed to obtain the bend angle ratio corresponding to the directional synchronization curve group;

[0052] The angle ratios corresponding to all directional synchronous curve groups are summed and averaged to obtain the angle ratio mean, the angle ratio corresponding to the directional synchronous curve group is subtracted from the angle ratio mean, and the absolute value of the difference is taken to obtain the angle ratio deviation corresponding to the directional synchronous curve group;

[0053] Integrate the bending angle ratios corresponding to all directional synchronous curve groups into a bending angle ratio data group, obtain the standard deviation of the bending angle ratio data group, and compare the bending angle ratio deviation corresponding to the directional synchronous curve group with the standard deviation of the bending angle ratio data group;

[0054] If the fold angle ratio deviation corresponding to the direction synchronization curve group is less than or equal to the standard deviation of the fold angle ratio data group, then the direction synchronization curve group is marked as a change synchronization curve group;

[0055] The number of change synchronization curve groups is counted, and the ratio is processed with the number of direction synchronization curve groups to obtain the change synchronization value.

[0056] As a further technical solution of the present invention, the flow rate control value is obtained by:

[0057] Acquire the abnormal ion migration amount when the control signal is generated, perform difference processing on the abnormal ion migration amount and the maximum normal abnormal ion migration amount, and obtain the abnormal ion migration amount to be controlled;

[0058] Obtain the fold angle ratios corresponding to all the changing synchronous curve groups, sum and average them to obtain the target fold angle ratio, multiply the target fold angle ratio by the amount of ion abnormal migration to be controlled to obtain the flow rate control value.

[0059] A sewage treatment system based on electrodialysis, comprising:

[0060] Migration analysis module: real-time monitoring of abnormal ion migration data of sewage during electrodialysis, wherein the abnormal ion migration data includes the abnormal ion migration amount per unit time, and the abnormal ion migration data is compared with the constructed abnormal ion migration amount range to obtain an operation signal;

[0061] The operation signal includes a stop signal, an analysis signal and a running signal;

[0062] Proximity analysis module: based on the analysis signal, obtains the proximity value of ion abnormal migration, and compares it with the proximity threshold of ion abnormal migration to obtain a processing signal, wherein the processing signal includes a control signal and a reanalysis signal;

[0063] Sudden change analysis module: Based on the reanalysis signal and the abnormal ion migration data, the sudden change value is processed to determine the change state of the abnormal ion migration within a unit time. If the change state of the abnormal ion migration within a unit time is a sudden change, a control signal is generated;

[0064] Impact analysis module: based on the control signal, obtain the flow rate data of sewage during electrodialysis, wherein the flow rate data includes the sewage flow rate value per unit time, construct a flow rate change curve based on the flow rate data, process and analyze the flow rate change curve to obtain the flow rate impact value, compare the flow rate impact value with the flow rate impact threshold, and generate an impact signal if the flow rate impact value is greater than or equal to the flow rate impact threshold;

[0065] Optimization and control module: Based on the influencing signal, the flow rate control value is obtained, and the flow rate during sewage electrodialysis treatment is controlled based on the flow rate control value.

[0066] The beneficial effects of the present invention are as follows: real-time monitoring of abnormal ion migration data of sewage during electrodialysis, wherein the abnormal ion migration data includes the abnormal ion migration amount per unit time, comparing the abnormal ion migration data with the constructed abnormal ion migration amount range interval to obtain an operation signal, wherein the operation signal includes a stop signal, an analysis signal and a run signal, based on the analysis signal, obtaining an ion abnormal migration proximity value, and comparing it with the ion abnormal migration proximity threshold to obtain a processing signal, wherein the processing signal includes a control signal and a re-analysis signal, based on the re-analysis signal, according to the abnormal ion migration data, processing to obtain a sharp change value, according to the sharp change value, judging the change state of the abnormal ion migration per unit time, if the change state of the abnormal ion migration per unit time is a sharp change, generating a control signal, based on the control signal, obtaining the flow rate data of sewage during electrodialysis, wherein the flow rate data includes the sewage flow rate value per unit time, constructing a flow rate change curve based on the flow rate data, and processing and analyzing the flow rate change curve. , obtain the flow rate influence value, compare the flow rate influence value with the flow rate influence threshold value, if the flow rate influence value is greater than or equal to the flow rate influence threshold value, then generate an influence signal, based on the influence signal, obtain the flow rate control value, and control the flow rate during the sewage electrodialysis treatment based on the flow rate control value. The present invention first judges the abnormal ion migration of sewage during electrodialysis and generates a corresponding operation signal, which is conducive to timely discovering the abnormal migration of ions during sewage treatment and ensuring the normal operation of sewage electrodialysis treatment. Secondly, when the abnormal migration of ions does not reach a certain limit, a proximity analysis is performed. If the abnormal migration of ions is close to the limit value, control is performed, and when the abnormal migration of ions is not close to the limit value, a drastic change analysis is performed, so as to prevent and control in advance and prevent the abnormal migration from causing a decrease in the quality of sewage treatment. At the same time, the influencing factors (flow rate) are analyzed, and the corresponding control values ​​are obtained according to the influencing factors. The sewage electrodialysis treatment is regulated according to the control value, which is conducive to timely regulation when the sewage electrodialysis treatment is abnormal and ensure the quality of sewage electrodialysis treatment. BRIEF DESCRIPTION OF THE DRAWINGS

[0067] The present invention will be further described below in conjunction with the accompanying drawings.

[0068] Figure 1 This is a flow chart of the steps of a method for controlling wastewater treatment based on electrodialysis according to Embodiment 1 of the present invention;

[0069] Figure 2 It is a flowchart of a wastewater treatment system based on electrodialysis as described in Example 2 of the present invention. DETAILED DESCRIPTION

[0070] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further explained below in conjunction with specific implementation methods.

[0071] Example 1

[0072] The electrodialysis-based sewage treatment control method described in the embodiment of the present invention includes:

[0073] S1, pre-treating the sewage, wherein the pre-treatment includes removing large particles, suspended matter, organic matter and impurities;

[0074] S2, introducing the pretreated sewage into an electrodialysis device for dialysis to obtain fresh water;

[0075] S3, using biological treatment technology to disinfect the obtained fresh water, adjust the pH value, and remove residual ions.

[0076] Example 2

[0077] Based on Example 1, a method for controlling wastewater treatment based on electrodialysis according to an embodiment of the present invention includes:

[0078] Step 1: Real-time monitoring of abnormal ion migration data of sewage during electrodialysis, wherein the abnormal ion migration data includes the abnormal ion migration amount per unit time, and comparing the abnormal ion migration data with the constructed abnormal ion migration amount range interval to obtain an operation signal;

[0079] The operation signal includes a stop signal, an analysis signal and a running signal;

[0080] In some embodiments, when electrodialysis is performed on sewage, a sensor is used to monitor in real time the amount of cations entering the electrodialysis anode chamber per unit time and the amount of anions entering the cathode chamber per unit time, and the amount of cations entering the electrodialysis anode chamber per unit time and the amount of anions entering the cathode chamber per unit time are summed to obtain the amount of abnormal ion migration per unit time;

[0081] It should be noted that in electrodialysis wastewater treatment, under normal circumstances, under the action of the DC electric field, after cations and anions pass through the ion exchange membrane, cations will migrate to the cathode cavity and anions will migrate to the anode cavity. If the ion migration is wrong, the ion separation efficiency will be reduced, thereby reducing the water quality after wastewater treatment;

[0082] Exemplarily, the range of abnormal ion migration is constructed as follows:

[0083] Obtain the standard value of abnormal ion migration during electrodialysis sewage treatment and mark it as BZ, obtain the abnormal ion migration data of multiple historical sewage treatment processes, and screen out the maximum abnormal ion migration from the abnormal ion migration data of each sewage treatment process, sum and average the screened maximum abnormal ion migration amounts, obtain the maximum normal abnormal ion migration amount, and mark it as ZZ;

[0084] The abnormal ion migration range is constructed based on the standard value BZ of abnormal ion migration and the maximum normal abnormal ion migration ZZ. The abnormal ion migration range includes the normal migration range and the migration analysis range. The normal migration range is [0-ZZ], and the migration analysis range is (ZZ-BZ]. Note that ( indicates not included, [] indicates included, and ZZ < BZ.

[0085] It should be noted that when the abnormal ion migration data of multiple historical sewage treatment processes were obtained, the abnormal ion migration amount did not exceed the standard value of abnormal ion migration amount during the sewage treatment process, and the quality of the sewage after treatment was qualified;

[0086] In some embodiments, the abnormal ion migration amount per unit time is obtained and compared with the constructed range interval of the abnormal ion migration amount;

[0087] If the abnormal migration amount of ions per unit time is within the normal migration amount range, an operation signal is generated;

[0088] If the abnormal migration amount of ions per unit time is within the migration amount analysis interval, an analysis signal is generated;

[0089] If the abnormal migration amount of ions per unit time is neither within the normal migration amount interval nor within the migration amount analysis interval, a stop signal is generated;

[0090] It should be noted that the operation signal indicates that the abnormal ion migration amount per unit time is within the normal migration amount range, and the abnormal ion migration amount per unit time is normal, and the electrodialysis treatment of the sewage can continue. The analysis signal indicates that the abnormal ion migration amount per unit time exceeds the maximum normal abnormal ion migration amount under normal circumstances but is lower than the standard value of the abnormal ion migration amount, and analysis and regulation are required to prevent the abnormal ion migration amount per unit time from exceeding the standard value of the abnormal ion migration amount. The stop signal indicates that the abnormal ion migration amount per unit time has exceeded the standard value of the abnormal ion migration amount, and the electrodialysis treatment of the sewage has become abnormal. To prevent the sewage treatment from further deteriorating and damaging the electrodialysis equipment, stop protection is performed.

[0091] Step 2: Based on the analysis signal, obtain the ion abnormal migration proximity value, and compare it with the ion abnormal migration proximity threshold to obtain a processing signal, wherein the processing signal includes a control signal and a reanalysis signal;

[0092] Specifically, the abnormal ion migration amount is obtained, and the difference between the abnormal ion migration amount and the standard value is processed, and the absolute value of the difference is taken to obtain the abnormal ion migration amount deviation value, and the abnormal ion migration amount deviation value is processed with the standard value of the abnormal ion migration amount to obtain the abnormal ion migration approximate value;

[0093] In some embodiments, the ion abnormal migration proximity value is compared to the ion abnormal migration proximity threshold;

[0094] If the ion abnormal migration proximity value is greater than or equal to the ion abnormal migration proximity threshold, a reanalysis signal is generated;

[0095] If the ion abnormal migration proximity value is less than the ion abnormal migration proximity threshold, a control signal is generated;

[0096] It should be noted that the control signal indicates that the abnormal ion migration amount is close to the standard value of the abnormal ion migration amount. In order to prevent it from exceeding the standard value of the abnormal ion migration amount, control is performed to ensure the normal operation of the sewage electrodialysis. The re-analysis signal indicates that although the abnormal ion migration amount is not close to the standard value of the abnormal ion migration amount, it is necessary to analyze the change of the abnormal ion migration amount to prevent the abnormal ion migration amount from changing sharply and exceeding the standard value of the abnormal ion migration amount, resulting in abnormal sewage electrodialysis.

[0097] Step 3: Based on the reanalysis signal, according to the abnormal ion migration data, the change sharpness value is processed, and the change state of the abnormal ion migration in unit time is judged according to the change sharpness value. If the change state of the abnormal ion migration in unit time is a sharp change, a control signal is generated;

[0098] Specifically, the abnormal ion migration amount per unit time is marked in the XY coordinate system, and the marked data points of the abnormal ion migration amount per unit time are connected to obtain an abnormal ion migration change curve, wherein the X-axis represents time and the Y-axis represents the abnormal ion migration amount;

[0099] On the Y axis of the coordinate system, a straight line parallel to the X axis is drawn with the maximum abnormal migration of normal ions as the reference value, and it is marked as the maximum migration line;

[0100] The intersection of the abnormal ion migration change curve and the maximum migration line is marked as the over-limit point, and the over-limit point is connected with the mark point of the abnormal ion migration amount in the current unit time by a straight line to obtain a migration reference line;

[0101] Obtain the change time corresponding to the migration reference line, where the change time is the difference between the time points corresponding to the endpoints of the migration reference line on the X-axis;

[0102] The change time corresponding to the migration reference line is processed by ratio with the change time threshold to obtain the sharp time value, which is marked as Sj;

[0103] It should be noted that the change time threshold is set by those skilled in the art based on experience;

[0104] Marking a portion of the abnormal ion migration change curve between the over-limit point and the marking point of the abnormal ion migration amount in the current unit time as an over-limit curve;

[0105] The superboundary curve is divided into a number of superboundary sub-curves with equal horizontal lengths, and the slope value of the superboundary sub-curve is calculated according to the coordinates of the two end points of the sub-curve and the calculation formula of the straight line slope;

[0106] Compare the slope value of the superbound subcurve with the slope value of the migration reference line:

[0107] If the slope value of the superboundary subcurve is greater than or equal to the slope value of the migration reference line, then the superboundary subcurve is marked as a sharp subcurve;

[0108] If the slope value of the superboundary subcurve is less than the slope value of the migration reference line, then the superboundary subcurve is marked as a non-sharp subcurve;

[0109] Count the number of sharp sub-curves, perform ratio processing on the number of sharp sub-curves and the number of super-boundary sub-curves to obtain a sharpness value, which is marked as Cd;

[0110] The obtained sharp time value Sj and sharp degree value Cd are processed by data, and the formula is: The sharp change value JU is obtained, wherein s1 and s2 are both preset proportional coefficients;

[0111] In some embodiments, the change sharpness value JU is compared to a change sharpness threshold:

[0112] If the change sharpness value JU is greater than or equal to the change sharpness threshold, it means that the abnormal ion migration state changes sharply within a unit time, and a control signal is generated;

[0113] If the change sharp value JU is less than the change sharp threshold, it means that the abnormal ion migration state is not changing sharply within the unit time, and no operation is performed until the abnormal ion migration proximity value is greater than or equal to the abnormal ion migration proximity threshold, and then regulation is performed;

[0114] Step 4: Based on the control signal, the flow rate data of the sewage during electrodialysis is obtained, wherein the flow rate data includes the sewage flow rate value per unit time, a flow rate change curve is constructed based on the flow rate data, the flow rate change curve is processed and analyzed to obtain a flow rate influence value, the flow rate influence value is compared with a flow rate influence threshold, and if the flow rate influence value is greater than or equal to the flow rate influence threshold, an influence signal is generated;

[0115] Obtain the sewage flow rate value per unit time, mark it in the XY coordinate system, connect the marked sewage flow rate value data points, and obtain a flow rate change curve;

[0116] The velocity variation curve is divided into a number of velocity sub-curves with equal horizontal lengths, wherein the horizontal length of the velocity sub-curve is equal to the horizontal length of the super-boundary sub-curve;

[0117] Integrate the velocity sub-curves and the super-boundary sub-curves with the same time points corresponding to the endpoints into a curve group;

[0118] In the curve group, take the midpoint of the velocity sub-curve, connect the midpoint of the velocity sub-curve with the two end points of the velocity sub-curve by straight lines, obtain the angle formed by the two connected straight lines, and mark it as the velocity angle. Similarly, take the midpoint of the superboundary sub-curve, connect the midpoint of the superboundary sub-curve with the two end points of the superboundary sub-curve by straight lines, obtain the angle formed by the two connected straight lines, and mark it as the superboundary angle.

[0119] Compare the opening direction of the velocity bend with the opening direction of the overbound bend:

[0120] If the opening direction of the velocity bend and the opening direction of the over-boundary bend are both upward or downward, their curve groups are marked as direction-synchronized curve groups;

[0121] If the opening direction of the velocity bend and the opening direction of the over-boundary bend are not uniformly upward or uniformly downward, the curve group is marked as a directionally asynchronous curve group;

[0122] Count the number of direction synchronization curve groups, perform ratio processing on the number of direction synchronization curve groups and the number of curve groups, and obtain the direction synchronization value;

[0123] In the directional synchronization curve group, the angle of the velocity bend angle and the angle of the over-boundary bend angle corresponding to the directional synchronization curve group are obtained, and the ratio processing is performed to obtain the bend angle ratio corresponding to the directional synchronization curve group;

[0124] Sum and average the angle ratios corresponding to all directional synchronous curve groups to obtain the angle ratio mean, perform difference processing between the angle ratio corresponding to the directional synchronous curve group and the angle ratio mean, and take the absolute value of the difference to obtain the angle ratio deviation corresponding to the directional synchronous curve group, integrate the angle ratios corresponding to all directional synchronous curve groups into an angle ratio data group, obtain the standard deviation of the angle ratio data group, compare the angle ratio deviation corresponding to the directional synchronous curve group with the standard deviation of the angle ratio data group, if the angle ratio deviation corresponding to the directional synchronous curve group is greater than the standard deviation of the angle ratio data group, mark its directional synchronous curve group as a changing non-synchronous curve group, if the angle ratio deviation corresponding to the directional synchronous curve group is less than or equal to the standard deviation of the angle ratio data group, mark its directional synchronous curve group as a changing synchronous curve group;

[0125] The number of change synchronization curve groups is counted, and the ratio is processed with the number of direction synchronization curve groups to obtain the change synchronization value;

[0126] The direction synchronization value and the change synchronization value are summed to obtain the flow velocity impact value;

[0127] It should be noted that the flow velocity influence value means: the flow velocity influence value reflects the degree of synchronization between the flow velocity change and the abnormal ion migration change. The larger the flow velocity influence value, the greater the degree of synchronization between the flow velocity change and the abnormal ion migration change, indicating that the flow velocity has a greater influence on the abnormal ion migration. On the contrary, the smaller the flow velocity influence value, the smaller the degree of synchronization between the flow velocity change and the abnormal ion migration change, indicating that the flow velocity has a smaller influence on the abnormal ion migration.

[0128] In some embodiments, the flow rate impact value is compared to a flow rate impact threshold:

[0129] If the flow velocity impact value is greater than or equal to the flow velocity impact threshold, an impact signal is generated;

[0130] If the flow velocity impact value is less than the flow velocity impact threshold, a non-impact signal is generated;

[0131] Based on the non-influencing signals, possible influencing factors are investigated and analyzed, including but not limited to the voltage, current and temperature during electrodialysis;

[0132] Step 5: Based on the influencing signal, a flow rate control value is obtained, and the flow rate during the sewage electrodialysis treatment is controlled based on the flow rate control value;

[0133] Specifically, the abnormal ion migration amount when the control signal is generated is obtained, and the abnormal ion migration amount is subjected to difference processing with the maximum normal abnormal ion migration amount to obtain the abnormal ion migration amount to be controlled;

[0134] Obtain the fold angle ratios corresponding to all the change synchronization curve groups, sum and average them to obtain the target fold angle ratio, multiply the target fold angle ratio by the amount of ion abnormal migration to be controlled to obtain the flow rate control value;

[0135] It should be noted that the angle ratio reflects the relative change relationship between the abnormal ion migration amount and the flow rate. By multiplying it with the abnormal ion migration amount to be controlled, the flow rate control value can be obtained.

[0136] The technical solution of the embodiment of the present invention is: real-time monitoring of abnormal ion migration data of sewage during electrodialysis, wherein the abnormal ion migration data includes the abnormal ion migration amount per unit time, comparing the abnormal ion migration data with the constructed abnormal ion migration amount range interval to obtain an operation signal, wherein the operation signal includes a stop signal, an analysis signal and a run signal, based on the analysis signal, obtaining an abnormal ion migration proximity value, and comparing it with the abnormal ion migration proximity threshold to obtain a processing signal, wherein the processing signal includes a control signal and a re-analysis signal, based on the re-analysis signal, according to the abnormal ion migration data, processing to obtain a sharp change value, according to the sharp change value, judging the change state of the abnormal ion migration per unit time, if the change state of the abnormal ion migration per unit time is a sharp change, then generating a control signal, based on the control signal, obtaining the flow rate data of sewage during electrodialysis, wherein the flow rate data includes the sewage flow rate value per unit time, constructing a flow rate change curve based on the flow rate data, processing and analyzing the flow rate change curve The flow rate influence value is obtained by analyzing the flow rate influence value, and the flow rate influence value is compared with the flow rate influence threshold value. If the flow rate influence value is greater than or equal to the flow rate influence threshold value, an influence signal is generated. Based on the influence signal, a flow rate control value is obtained. Based on the flow rate control value, the flow rate during the electrodialysis treatment of sewage is regulated. The present invention firstly judges the abnormal migration of ions in the electrodialysis of sewage and generates a corresponding operation signal, which is conducive to timely discovering the abnormal migration of ions during sewage treatment and ensuring the normal operation of the electrodialysis treatment of sewage. Secondly, when the abnormal migration of ions does not reach a certain limit, a proximity analysis is performed. If the abnormal migration of ions is close to the limit value, regulation is performed, and when the abnormal migration of ions is not close to the limit value, a drastic change analysis is performed, so as to prevent and control in advance and prevent the abnormal migration from causing a decrease in the quality of sewage treatment. At the same time, the influencing factors (flow rate) are analyzed, and the corresponding control values ​​are obtained according to the influencing factors. The electrodialysis treatment of sewage is regulated according to the control value, which is conducive to timely regulation when the electrodialysis treatment of sewage is abnormal and ensures the electrodialysis treatment quality of sewage.

[0137] Example 2

[0138] like Figure 2 As shown, a sewage treatment system based on electrodialysis according to an embodiment of the present invention comprises:

[0139] Migration analysis module: real-time monitoring of abnormal ion migration data of sewage during electrodialysis, wherein the abnormal ion migration data includes the abnormal ion migration amount per unit time, and the abnormal ion migration data is compared with the constructed abnormal ion migration amount range to obtain an operation signal;

[0140] The operation signal includes a stop signal, an analysis signal and a running signal;

[0141] Proximity analysis module: based on the analysis signal, obtains the proximity value of ion abnormal migration, and compares it with the proximity threshold of ion abnormal migration to obtain a processing signal, wherein the processing signal includes a control signal and a reanalysis signal;

[0142] Sudden change analysis module: Based on the reanalysis signal and the abnormal ion migration data, the sudden change value is processed to determine the change state of the abnormal ion migration within a unit time. If the change state of the abnormal ion migration within a unit time is a sudden change, a control signal is generated;

[0143] Impact analysis module: based on the control signal, obtain the flow rate data of sewage during electrodialysis, wherein the flow rate data includes the sewage flow rate value per unit time, construct a flow rate change curve based on the flow rate data, process and analyze the flow rate change curve to obtain the flow rate impact value, compare the flow rate impact value with the flow rate impact threshold, and generate an impact signal if the flow rate impact value is greater than or equal to the flow rate impact threshold;

[0144] Optimization and control module: Based on the influencing signal, the flow rate control value is obtained, and the flow rate during sewage electrodialysis treatment is controlled based on the flow rate control value.

[0145] The above shows and describes the basic principles, main features and advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A wastewater treatment control method based on electrodialysis, characterized in that: include: Real-time monitoring of abnormal ion migration data of sewage during electrodialysis, wherein the abnormal ion migration data includes the abnormal ion migration amount per unit time, and the abnormal ion migration data is compared with the constructed abnormal ion migration amount range interval to obtain an operation signal; The operation signal includes a stop signal, an analysis signal and a running signal; The construction method of the abnormal ion migration range is as follows: Obtain the standard value of abnormal ion migration during electrodialysis sewage treatment and mark it as BZ, obtain the abnormal ion migration data of multiple historical sewage treatment processes, and screen out the maximum abnormal ion migration from the abnormal ion migration data of each sewage treatment process, sum and average the screened maximum abnormal ion migration amounts, obtain the maximum normal abnormal ion migration amount, and mark it as ZZ; The abnormal ion migration range is constructed based on the standard value BZ of abnormal ion migration and the maximum normal abnormal ion migration ZZ, wherein the abnormal ion migration range includes the normal migration range [0-ZZ] and the migration analysis range (ZZ-BZ); Based on the analysis signal, an ion abnormal migration proximity value is obtained, and the value is compared with an ion abnormal migration proximity threshold to obtain a processing signal, wherein the processing signal includes a control signal and a reanalysis signal; The processing signal is generated in the following manner: Obtain the abnormal ion migration amount, perform difference processing on it and the standard value of the abnormal ion migration amount, and take the absolute value of the difference to obtain the abnormal ion migration amount deviation value, perform ratio processing on the abnormal ion migration amount deviation value and the standard value of the abnormal ion migration amount to obtain the abnormal ion migration approximate value; comparing the ion abnormal migration proximity value with the ion abnormal migration proximity threshold; If the ion abnormal migration proximity value is greater than or equal to the ion abnormal migration proximity threshold, a reanalysis signal is generated; If the ion abnormal migration proximity value is less than the ion abnormal migration proximity threshold, a control signal is generated; Based on the reanalysis signal, according to the abnormal ion migration data, the change sharpness value is processed to determine the change state of the abnormal ion migration within a unit time according to the change sharpness value. If the change sharpness value is greater than or equal to the change sharpness threshold, it means that the abnormal ion migration state within a unit time changes sharply, and a control signal is generated; The method for obtaining the sharp change value is as follows: The abnormal ion migration amount per unit time is marked in the XY coordinate system, and the marked data points of the abnormal ion migration amount per unit time are connected to obtain the abnormal ion migration change curve; On the Y axis of the coordinate system, a straight line parallel to the X axis is drawn with the maximum abnormal migration of normal ions as the reference value, and it is marked as the maximum migration line; The intersection of the abnormal ion migration change curve and the maximum migration line is marked as the over-limit point, and the over-limit point is connected with the mark point of the abnormal ion migration amount in the current unit time by a straight line to obtain a migration reference line; Obtain the change time corresponding to the migration reference line, where the change time is the difference between the time points corresponding to the endpoints of the migration reference line on the X-axis; The change time corresponding to the migration reference line is processed by ratio with the change time threshold to obtain the sharp time value, which is marked as Sj; Marking a portion of the abnormal ion migration change curve between the over-limit point and the marking point of the abnormal ion migration amount in the current unit time as an over-limit curve; The superboundary curve is divided into a number of superboundary sub-curves with equal horizontal lengths, and the slope value of the superboundary sub-curve is calculated according to the coordinates of the two end points of the sub-curve and the calculation formula of the straight line slope; Compare the slope value of the superbound subcurve with the slope value of the migration reference line: If the slope value of the superboundary subcurve is greater than or equal to the slope value of the migration reference line, then the superboundary subcurve is marked as a sharp subcurve; Count the number of sharp sub-curves, perform ratio processing on the number of sharp sub-curves and the number of super-boundary sub-curves to obtain a sharpness value, which is marked as Cd; The obtained sharp time value Sj and sharp degree value Cd are processed by data, and the formula is: The sharp change value JU is obtained, wherein s1 and s2 are both preset proportional coefficients; Based on the control signal, the flow rate data of the sewage during electrodialysis is obtained, wherein the flow rate data includes the sewage flow rate value per unit time, a flow rate change curve is constructed based on the flow rate data, the flow rate change curve is processed and analyzed to obtain a flow rate influence value, the flow rate influence value is compared with a flow rate influence threshold, and if the flow rate influence value is greater than or equal to the flow rate influence threshold, an influence signal is generated; The flow velocity influence value is obtained in the following manner: Obtain the sewage flow rate value per unit time, mark it in the XY coordinate system, connect the marked sewage flow rate value data points, and obtain a flow rate change curve; The velocity variation curve is divided into a number of velocity sub-curves with equal horizontal lengths, wherein the horizontal length of the velocity sub-curve is equal to the horizontal length of the super-boundary sub-curve; Integrate the velocity sub-curves and the super-boundary sub-curves with the same time points corresponding to the endpoints into a curve group; In the curve group, take the midpoint of the velocity sub-curve, connect the midpoint of the velocity sub-curve with the two end points of the velocity sub-curve by straight lines, obtain the angle formed by the two connected straight lines, and mark it as the velocity angle. Similarly, take the midpoint of the superboundary sub-curve, connect the midpoint of the superboundary sub-curve with the two end points of the superboundary sub-curve by straight lines, obtain the angle formed by the two connected straight lines, and mark it as the superboundary angle. Compare the opening direction of the velocity bend with the opening direction of the overbound bend: If the opening direction of the velocity bend and the opening direction of the over-boundary bend are both upward or downward, their curve groups are marked as direction-synchronized curve groups; Count the number of direction synchronization curve groups, perform ratio processing on the number of direction synchronization curve groups and the number of curve groups, and obtain the direction synchronization value; The direction synchronization value and the change synchronization value are summed to obtain the flow velocity impact value; The change synchronization value is obtained in the following manner: In the directional synchronization curve group, the angle of the velocity bend angle and the angle of the over-boundary bend angle corresponding to the directional synchronization curve group are obtained, and the ratio processing is performed to obtain the bend angle ratio corresponding to the directional synchronization curve group; The angle ratios corresponding to all directional synchronous curve groups are summed and averaged to obtain the angle ratio mean, the angle ratio corresponding to the directional synchronous curve group is subtracted from the angle ratio mean, and the absolute value of the difference is taken to obtain the angle ratio deviation corresponding to the directional synchronous curve group; Integrate the bending angle ratios corresponding to all directional synchronous curve groups into a bending angle ratio data group, obtain the standard deviation of the bending angle ratio data group, and compare the bending angle ratio deviation corresponding to the directional synchronous curve group with the standard deviation of the bending angle ratio data group; If the fold angle ratio deviation corresponding to the direction synchronization curve group is less than or equal to the standard deviation of the fold angle ratio data group, then the direction synchronization curve group is marked as a change synchronization curve group; The number of change synchronization curve groups is counted, and the ratio is processed with the number of direction synchronization curve groups to obtain the change synchronization value; Based on the influencing signal, a flow rate control value is obtained, and based on the flow rate control value, the flow rate during the sewage electrodialysis treatment is controlled.

2. The electrodialysis-based sewage treatment control method according to claim 1 is characterized in that: The operation signal is generated in the following manner: Obtaining the abnormal ion migration amount per unit time and comparing it with the constructed range of the abnormal ion migration amount; If the abnormal migration amount of ions per unit time is within the normal migration amount range, an operation signal is generated; If the abnormal migration amount of ions per unit time is within the migration amount analysis interval, an analysis signal is generated; If the abnormal ion migration amount per unit time is neither within the normal migration amount interval nor within the migration amount analysis interval, a stop signal is generated.

3. The electrodialysis-based sewage treatment control method according to claim 1 is characterized in that: The flow rate control value is obtained in the following manner: Acquire the abnormal ion migration amount when the control signal is generated, perform difference processing on the abnormal ion migration amount and the maximum normal abnormal ion migration amount, and obtain the abnormal ion migration amount to be controlled; Obtain the fold angle ratios corresponding to all the changing synchronous curve groups, sum and average them to obtain the target fold angle ratio, multiply the target fold angle ratio by the amount of ion abnormal migration to be controlled to obtain the flow rate control value.

4. A sewage treatment system based on electrodialysis, the system is used to implement the treatment control method according to any one of claims 1 to 3, characterized in that: include: Migration analysis module: real-time monitoring of abnormal ion migration data of sewage during electrodialysis, wherein the abnormal ion migration data includes the abnormal ion migration amount per unit time, and the abnormal ion migration data is compared with the constructed abnormal ion migration amount range to obtain an operation signal; The operation signal includes a stop signal, an analysis signal and a running signal; Proximity analysis module: based on the analysis signal, obtains the proximity value of ion abnormal migration, and compares it with the proximity threshold of ion abnormal migration to obtain a processing signal, wherein the processing signal includes a control signal and a reanalysis signal; Sudden change analysis module: Based on the reanalysis signal and the abnormal ion migration data, the sudden change value is processed to determine the change state of the abnormal ion migration within a unit time. If the change state of the abnormal ion migration within a unit time is a sudden change, a control signal is generated; Impact analysis module: based on the control signal, obtain the flow rate data of sewage during electrodialysis, wherein the flow rate data includes the sewage flow rate value per unit time, construct a flow rate change curve based on the flow rate data, process and analyze the flow rate change curve to obtain the flow rate impact value, compare the flow rate impact value with the flow rate impact threshold, and generate an impact signal if the flow rate impact value is greater than or equal to the flow rate impact threshold; Optimization and control module: Based on the influencing signal, the flow rate control value is obtained, and the flow rate during sewage electrodialysis treatment is controlled based on the flow rate control value.

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