A control system for ozone dosage

Abstract

The present invention relates to a control system for ozone dosage, which determines whether the COD concentration value of the influent at the current moment belongs to high concentration, medium concentration or low concentration by comparing the relationship between the COD concentration value of the influent at the current moment and the set high concentration threshold and low concentration threshold, and calculates the required amount of ozone in different ways according to the different concentration ranges to which it belongs, and controls the ozone generator to prepare the required amount of ozone and add it to the ozone catalytic oxidation reactor. The method can effectively improve the utilization rate of ozone, avoid ozone waste caused by manual addition, addition methods that do not distinguish concentrations, or problems such as unqualified effluent COD concentration caused by insufficient ozone addition, and at the same time, reduce the operating cost of sewage treatment.

Description

Technical Field

[0001] The invention relates to the technical field of sewage treatment, in particular to a control system for ozone dosage. Background Art

[0002] The common sewage treatment process is to use the strong oxidizing property of ozone to remove chemical oxygen demand (COD). In the whole sewage treatment process, the removal of COD requires the consumption of ozone. If you want to maintain a stable COD concentration in the ozone pool, you must continue to add ozone to keep the COD concentration at a reasonable level. Since the COD concentration of the incoming water is different, the amount of ozone added must also be changed in real time to ensure the treatment effect.

[0003] When determining the ozone dosage in real time, it is necessary to consider the mutual influence of factors such as equipment structure, water quality and quantity, mixing efficiency and water temperature. Therefore, accurate and automatic ozone dosage requires the combination of water treatment process and ozone manufacturing technology, which leads to increased manufacturing and operating costs of ozone-based sewage treatment systems; at the same time, the separation of users, construction units and manufacturing units in the application of ozone-based sewage treatment systems makes it difficult to form effective information and experience sharing, and the water quality treated by each ozone catalytic oxidation project is different, which increases the difficulty for manufacturers to achieve automated process optimization; which in turn leads to the existing ozone-based sewage treatment system The dosage of heavy ozone is manually controlled by empirical fuzzy control. Summary of the invention

[0004] Based on this, the object of the present invention is to provide a control system for ozone dosage.

[0005] The detailed technical scheme of the control system of ozone dosage of the present invention is as follows.

[0006] An ozone dosage control system includes: an ozone generator, a detection module, a valve module and a controller.

[0007] Ozone generator, to prepare ozone;

[0008] The detection module includes a flow meter and a COD detector, wherein the flow meter detects the inlet flow rate of the water entering the ozone catalytic oxidation reactor; the COD detector detects the inlet COD concentration value of the raw water entering the ozone catalytic oxidation reactor and the outlet COD concentration value of the water treated by the ozone catalytic oxidation reactor;

[0009] The valve module includes a sampling valve and an ozone dosing valve, wherein the sampling valve controls the amount of raw water entering the COD detector and the amount of sample liquid to be tested entering the COD detector from the ozone catalytic oxidation reactor; the ozone dosing valve is used to control the amount of ozone entering the ozone catalytic oxidation reactor;

[0010] A controller, electrically and / or communicatively connected to the valve module, the detection module, and the ozone generator;

[0011] The controller obtains the required amount of ozone by the following method and then controls the amount of ozone produced by the ozone generator:

[0012] Obtain the current influent COD concentration value, and compare the current influent COD concentration value with the set high concentration threshold and low concentration threshold:

[0013] If the current inlet COD concentration value is greater than the high concentration threshold, the target COD removal rate adjustment mode is adopted to calculate the amount of ozone required at the current moment according to the current inlet COD concentration value, the current outlet COD concentration value, the set target outlet COD concentration value, and the current inlet flow rate;

[0014] If the current influent COD concentration value is less than or equal to the high concentration threshold and greater than or equal to the low concentration threshold, the unit water volume fixed ozone dosage adjustment mode is adopted to calculate the required ozone dosage at the current moment based on the average value of the ratio of the current influent flow rate and the unit water volume fixed ozone dosage obtained from system operation statistics;

[0015] If the current inlet COD concentration value is less than the low concentration threshold, the outlet COD concentration value adjustment mode is adopted to calculate the required ozone amount at the current moment according to the obtained current inlet COD concentration value, the current outlet COD concentration value, the current inlet flow rate, the set target outlet COD concentration value and the concentration correction coefficient α.

[0016] Compared with the prior art, the present invention combines the ozone catalytic oxidation water treatment process and the ozone preparation process, and judges whether the current inlet COD concentration value belongs to high concentration, medium concentration or low concentration by comparing the relationship between the current inlet COD concentration value and the set high concentration threshold and low concentration threshold, and calculates the required amount of ozone in different ways according to the different concentration ranges to which it belongs, and controls the ozone generator to prepare the required amount of ozone and add it to the ozone catalytic oxidation reactor. This method can effectively improve the utilization rate of ozone, avoid ozone waste caused by manual addition, addition methods that do not distinguish concentrations, or problems such as unqualified effluent COD concentration caused by insufficient ozone addition, and at the same time, reduce the operating cost of sewage treatment.

[0017] Furthermore, the target COD removal rate adjustment mode is specifically:

[0018] Obtain the current outlet COD concentration value, calculate the current COD removal rate according to the current inlet COD concentration value and the current outlet COD concentration value, and determine whether the current COD removal rate is less than or equal to the set target COD removal rate:

[0019] If yes, continue to obtain the influent COD concentration value at the next moment;

[0020] If no, obtain the current inlet flow rate, calculate the required ozone amount at the current moment according to the current inlet COD concentration value, the current outlet COD concentration value, the set target outlet COD concentration value, and the current inlet flow rate, and continue to obtain the inlet COD concentration value at the next moment.

[0021] Furthermore, the COD removal rate at the current moment satisfies:

[0022]

[0023] Where: R t Indicates the COD removal rate at the current moment, Indicates the current influent COD concentration value. Indicates the current outlet COD concentration value;

[0024] The target COD removal rate meets:

[0025]

[0026] Where: R target represents the target COD removal rate, It represents the mean value of the influent COD concentration of the system operation statistics. Indicates the target effluent COD concentration value.

[0027] Furthermore, the amount of ozone required at the current moment satisfies:

[0028]

[0029] Where: Indicates the amount of ozone required at the current moment, f t Indicates the water inflow at the current moment.

[0030] Furthermore, the unit water volume fixed ozone dosage adjustment mode is specifically as follows:

[0031] Get the current water flow rate, calculate the required ozone amount at the current moment based on the average ratio of the unit water volume and the fixed ozone amount according to the system operation statistics Continuously obtain the next moment of influent COD concentration value Among them, the amount of ozone required at the current moment satisfy:

[0032]

[0033] Where: Indicates the amount of ozone required at the current moment, R 均值It represents the average value of the ratio of the amount of ozone per unit water in the system operation statistics, f t Indicates the water inflow at the current moment.

[0034] Furthermore, the outlet COD concentration value adjustment mode is specifically as follows:

[0035] Obtain the current outlet COD concentration value and the current inlet flow rate, and calculate the amount of ozone required at the current moment based on the current inlet COD concentration value, the current outlet COD concentration value, the current inlet flow rate, the set target outlet COD concentration value and the concentration correction coefficient α. Continuously obtain the next moment of influent COD concentration value

[0036] Furthermore, the concentration correction factor satisfies:

[0037] α=m COD / m O3

[0038] Where: α represents the concentration correction factor, m COD Indicates the amount of COD in the water at the last moment, m O3 Indicates the amount of ozone required at the last moment;

[0039] The amount of ozone required at the current moment meets:

[0040]

[0041] Where: Indicates the amount of ozone required at the current moment. Indicates the current influent COD concentration value. Indicates the current outlet COD concentration value. Indicates the target effluent COD concentration value, f t Indicates the water inflow at the current moment.

[0042] Furthermore, the control system also includes an alkali solution supplier electrically or communicatively connected to the controller, an alkali solution control valve for controlling the amount of alkali solution, and a pH detector for detecting the reaction pH value of the reaction solution in the ozone catalytic oxidation reactor. In the process of the controller controlling the ozone generator to prepare ozone, the following steps are also included:

[0043] Obtain the current reaction pH value, and compare the current reaction pH value with the set maximum pH value and minimum pH value:

[0044] If the current reaction pH value is greater than the maximum pH value, the addition of alkali solution is suspended, and the next reaction pH value is continuously obtained;

[0045] If the current reaction pH value is less than or equal to the maximum pH value and greater than or equal to the minimum pH value, the current alkali solution dosage is maintained and the next reaction pH value is continuously obtained;

[0046] If the reaction pH value at the current moment is less than the minimum pH value, the actual alkali solution demand is calculated based on the reaction pH value at the current moment, the current water inlet flow rate and the set target pH value, the alkali solution supplier is controlled to add alkali solution to the inlet water according to the actual demand, and the reaction pH value at the next moment is continuously obtained.

[0047] Furthermore, the control system also includes a temperature regulating module electrically or communicatively connected to the controller, and a pH thermometer for detecting the reaction temperature of the reaction liquid in the ozone catalytic oxidation reactor. In the process of the controller controlling the ozone generator to prepare ozone, the following steps are also included:

[0048] Get the current reaction temperature, and compare the current reaction temperature with the set maximum temperature and minimum temperature:

[0049] If the current reaction temperature is greater than the maximum temperature, the temperature regulating module is controlled to cool the raw water or the ozone catalytic oxidation reactor, and the reaction temperature at the next moment is continuously obtained;

[0050] If the current reaction temperature is less than or equal to the maximum temperature and greater than or equal to the minimum temperature, the temperature adjustment module is controlled to maintain the current temperature and the reaction temperature at the next moment is continuously obtained;

[0051] If the reaction temperature at the current moment is lower than the minimum temperature, the temperature regulating module is controlled to increase the temperature of the raw water or the ozone catalytic oxidation reactor, and the reaction temperature at the next moment is continuously obtained.

[0052] At the same time, the present invention monitors the current inlet COD concentration and outlet COD concentration to determine the ozone dosage, and also monitors and adjusts the reaction pH value and reaction temperature, so that the conditions of the ozone oxidation reaction are maintained under suitable alkaline conditions and temperature conditions, so as to achieve the highest utilization efficiency of ozone.

[0053] Furthermore, the control system further comprises a liquid level meter electrically or communicatively connected to the controller for detecting the liquid level of the raw water pool, and before starting the control of the ozone dosage, further comprises:

[0054] Get the current liquid level value of the raw water tank, and compare the current liquid level with the set high liquid level threshold and low liquid level threshold:

[0055] If the current liquid level value is less than the low liquid level threshold, the ozone catalytic oxidation reactor is controlled to shut down;

[0056] If the current liquid level value is less than or equal to the high liquid level threshold and greater than or equal to the low liquid level threshold, the start and stop information of the ozone catalytic oxidation reactor is sent to the user end, and the start and stop of the ozone catalytic oxidation reactor is controlled according to the start and stop instructions transmitted by the user end;

[0057] If the liquid level value at the current moment is greater than the high liquid level threshold, the control system for controlling the ozone catalytic oxidation reactor and the ozone dosage is started.

[0058] For better understanding and implementation, the present invention is described in detail below with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0059] Figure 1 This is a schematic diagram of the control system structure for ozone dosage in this application;

[0060] Figure 2 This is a schematic diagram of the control flow of ozone dosage for this application. DETAILED DESCRIPTION

[0061] Due to the differences in water quality treated by each ozone catalytic oxidation project, it is difficult to have a unified ozone dosage control method applied to different ozone catalytic oxidation projects. Considering the cost issue, the manufacturers of ozone-based sewage treatment systems do not have a corresponding ozone dosage control system, which leads to the use of ozone-based sewage treatment systems. The units usually use manual fuzzy control to control the ozone dosage. The manual fuzzy control method cannot accurately know the amount of ozone required by the ozone catalytic oxidation reactor in real time. Excessive dosage causes ozone waste and increases the operating cost of sewage treatment. Too little dosage causes unqualified effluent COD concentration and fails to meet the requirements of environmental protection and water treatment related technical indicators.

[0062] To this end, the present invention studies the existing ozone catalytic oxidation water treatment process and ozone preparation process, and finds that different ozone dosage control methods for different water qualities have beneficial effects. Accordingly, the present application studies and designs a method of controlling the ozone generator to prepare the required amount of ozone and add it to the ozone catalytic oxidation reactor by judging whether the COD concentration value of the inlet water belongs to high concentration, medium concentration or low concentration, and according to the different concentration ranges to which it belongs, using different methods to calculate the required amount of ozone. This method can effectively improve the utilization rate of ozone, avoid ozone waste caused by manual addition, addition methods that do not distinguish concentrations, or problems such as unqualified effluent COD concentration caused by insufficient ozone addition, and at the same time, reduce the operating cost of sewage treatment.

[0063] For specific implementation, please refer to Figure 1 The ozone dosage control system applied to the ozone catalytic oxidation system of the present application includes:

[0064] An alkali solution supplier 10 for storing alkali solution of a specific concentration;

[0065] The temperature regulating module 20 is used to regulate the temperature of the raw water or the reaction liquid of the ozone catalytic oxidation reactor;

[0066] An ozone generator 30 for preparing ozone;

[0067] The detection module 40 includes a liquid level meter 41, a pH detector 42, a flow meter 43, a thermometer 44, and a COD detector 45, wherein the liquid level meter 41 is used to detect the liquid level of the raw water pool; the pH detector 42 is used to detect the pH value of the reaction liquid of the ozone catalytic oxidation reactor; the flow meter 43 is used to detect the inlet flow rate of the raw water entering the ozone catalytic oxidation reactor; the thermometer 44 is used to detect the temperature of the reaction liquid of the ozone catalytic oxidation reactor; the COD detector 45 is used to detect the inlet COD concentration value of the raw water entering the ozone catalytic oxidation reactor and the outlet COD concentration value of the treated water after the ozone catalytic oxidation reaction; the liquid level meter 41 transmits the raw water pool liquid level signal, the pH detector 42 transmits the reaction liquid pH value signal, the flow meter 43 transmits the raw water flow signal, the thermometer 44 transmits the reaction liquid temperature signal, and the COD detector 45 transmits the inlet COD concentration value and the outlet COD concentration value to the controller;

[0068] The valve module 50 includes an alkali solution control valve 51, a sampling valve 52 and an ozone dosing valve 53, wherein the alkali solution control valve 51 is used to control the amount of alkali solution entering the ozone catalytic oxidation reactor; the sampling valve 52 is used to control the amount of raw water entering the COD detector 45, and the amount of sample liquid to be tested entering the COD detector 45 from the ozone catalytic oxidation reactor; the ozone dosing valve 53 is used to control the amount of ozone entering the ozone catalytic oxidation reactor;

[0069] The controller (not shown) is electrically and / or communicatively connected to the control valve module, the detection module, the alkali solution supplier, the temperature adjustment module, and the ozone generator, and determines the execution program through the received signal and sends instructions to the corresponding execution device.

[0070] Specifically, the controller includes a storage unit and a processing unit, wherein the storage unit is used to store the set high liquid level threshold L high , low level threshold L low , and target pH target , reaction fine-tuning ΔpH, and maximum temperature T max , minimum temperature T min , and high concentration threshold C high , low concentration threshold C low , and target COD removal rate R target , and target effluent COD concentration value At each collection time, the raw water tank liquid level collected by the liquid level meter The pH value of the reaction collected by the pH detector t , the reaction temperature T collected by the thermometer t , the water inlet flow rate f collected by the flow meter t , the COD concentration value of the influent collected by the COD detector Outlet COD concentration The processing unit is used to measure the COD concentration of the influent Outlet COD concentration Calculate COD removal rate R t , and the influent COD concentration value at each moment of system operation Calculate the average influent COD concentration Based on the average influent COD concentration Calculate the target COD removal rate R target , and through the influent COD concentration value Outlet COD concentration And target effluent COD concentration value Calculate the required ozone concentration Based on the required ozone concentration Calculate the required ozone amount based on the water inlet flow rate The average value of the ratio of the amount of ozone per unit water volume R is calculated by calculating the water inlet flow rate and the corresponding required ozone volume at each time of system operation. 均值 , and based on the ratio mean R 均值 , water flow rate f t Calculate the amount of ozone required And through the influent COD concentration value Inlet flow rate f t Calculate the amount of influent COD and based on the amount of influent COD m COD , Required ozone amount m O3 The concentration correction factor α is calculated and based on the required ozone concentration Concentration correction factor α and water flow rate f t Calculate the amount of ozone required And execute various judgment procedures and control procedures.

[0071] See also Figure 2 The method for controlling the ozone dosage of the present invention comprises the following steps.

[0072] S10 obtains the current influent COD concentration value And compare the current influent COD concentration value With the set high concentration threshold C high , low concentration threshold C low Relationship:

[0073] If the influent COD at the current moment Then execute step S20;

[0074] like Then execute step S30;

[0075] If water is entering at the current moment Then execute step S40.

[0076] In specific implementation, the high concentration threshold C high , low concentration threshold C low Determined by the experience value of long-term operation of the system or by the test results of the system trial operation. In this embodiment, according to the test of the ozone catalytic oxidation system, the ozone generator operating condition is set to 80% of the rated output. Under the rated flow rate, the average COD concentration value of the influent is used as a reference, the high concentration threshold of COD is set to be 10±% higher than the average COD concentration value, and the low concentration threshold of COD is set to be 10±% lower than the average COD concentration value.

[0077] S20 obtains the current outlet COD concentration value According to the current influent COD concentration value Current outlet COD concentration value Calculate the COD removal rate R at the current moment t , determine the current COD removal rate R t Is it less than or equal to the set target COD removal rate R target :

[0078] If yes, R t ≤R target , continuously obtain the next moment of influent COD concentration value

[0079] If not, R t >R target , get the current water flow rate f t , according to the current influent COD concentration value Current outlet COD concentration value The set target outlet COD concentration value and the current inlet flow rate f t Calculate the amount of ozone required at the current moment Control the amount of ozone prepared by the ozone generator and add it to the ozone catalytic oxidation reactor to continuously obtain the COD concentration value of the influent at the next moment

[0080] In specific implementation, the current COD removal rate R t satisfy:

[0081]

[0082] Where: Indicates the current influent COD concentration value. Indicates the current outlet COD concentration value.

[0083] The target COD removal rate R target The target effluent COD concentration Determine the specific target COD removal rate R target satisfy:

[0084]

[0085] Where: It indicates the average value of the influent COD concentration in the system operation statistics. Indicates the target effluent COD concentration value. The target effluent COD concentration value is the required value of the relevant environmental protection technical standards or water treatment technical standards.

[0086] Calculate the amount of ozone required at the current moment When the ozone concentration required at the current moment is calculated first The ozone concentration required at the current moment satisfy:

[0087]

[0088] Where: Indicates the current influent COD concentration value. Indicates the current outlet COD concentration value. Indicates the target effluent COD concentration value.

[0089] Then according to the ozone concentration required at the current moment Current water flow rate f t Calculate the amount of ozone required at the current moment The amount of ozone required at the current moment satisfy:

[0090]

[0091] Where: Indicates the required ozone concentration at the current moment, f t Indicates the water inflow at the current moment.

[0092] When the influent COD concentration is high, the target COD removal rate R targetAs an adjustment target, the amount of ozone added is controlled through this step, so that the added ozone can be fully used for oxidation and decomposition, thereby improving the utilization rate of ozone. At the same time, it avoids the technical problem of overload operation of the ozone generator caused by the high COD concentration of the inlet water and the inability to reach the target concentration of the outlet water due to the use of conventional dosing methods.

[0093] S30 obtains the current water flow rate f t , according to the system operation statistics, the ratio of ozone dosage per unit water volume R 均值 , calculate the amount of ozone required at the current moment Control the amount of ozone prepared by the ozone generator and add it to the ozone catalytic oxidation reactor to continuously obtain the COD concentration value of the influent at the next moment

[0094] The amount of ozone required at the current moment satisfy:

[0095]

[0096] Where: R 均值 It represents the average value of the ratio of the amount of ozone per unit water in the system operation statistics, f t Indicates the water inflow at the current moment.

[0097] When the inlet COD concentration is at a medium level, the ratio of the operating unit water volume to the ozone amount is used as the adjustment target. The controller adjusts and controls the ozone dosage in real time according to the inlet flow rate, which can effectively improve the ozone utilization rate and reduce ozone waste.

[0098] S40 obtains the current outlet COD concentration value Current water flow rate f t , according to the current influent COD concentration value Current outlet COD concentration value Current water flow rate f t , set the target effluent COD concentration value and concentration correction factor α, calculate the amount of ozone required at the current moment Control the amount of ozone prepared by the ozone generator and add it to the ozone catalytic oxidation reactor to continuously obtain the COD concentration value of the influent at the next moment

[0099] Calculate the amount of ozone required at the current moment When the ozone concentration required at the current moment is calculated first The ozone concentration required at the current moment satisfy:

[0100]

[0101] Where: Indicates the current influent COD concentration value. Indicates the current outlet COD concentration value. Indicates the target effluent COD concentration value.

[0102] Then according to the ozone concentration required at the current moment Concentration correction coefficient α and current water flow rate f t Calculate the amount of ozone required at the current moment The amount of ozone required at the current moment satisfy:

[0103]

[0104] Where: Indicates the required ozone concentration at the current moment, f t represents the water flow at the current moment, and α represents the concentration correction coefficient, whose value satisfies:

[0105] α=m COD / m O3

[0106] Where: m COD Indicates the amount of COD in the water at the last moment, m O3 Indicates the amount of ozone required at the last moment.

[0107] When the inlet COD concentration is low, using the outlet COD concentration as the adjustment target can prevent excessive ozone addition, save ozone and improve ozone utilization.

[0108] At the same time, the method for controlling the ozone dosage of the present invention includes the following pre-sequence steps before being implemented.

[0109] S00 obtains the current level value of the original water tank And compare the current liquid level With the set high level threshold L high , low level threshold L low Relationship:

[0110] If the current moment Then the ozone catalytic oxidation reactor is controlled to shut down;

[0111] If low The start and stop information of the ozone catalytic oxidation reactor is sent to the user end, and the start and stop of the ozone catalytic oxidation reactor is controlled according to the start and stop instructions transmitted by the user end;

[0112] If the current moment Then control the ozone catalytic oxidation reactor to start.

[0113] The raw water in the raw water pool is produced by the MBR membrane biochemical reaction tank. If the water is not produced by the MBR membrane, the concentration of suspended solids in the inlet water needs to be controlled to be less than 10 mg / L. If the suspended solids in the water are large and large, a multi-media filter needs to be added for filtration.

[0114] In specific implementation, the high liquid level threshold L high , low level threshold L low Depends on the adjustable liquid level in the original water tank.

[0115] This step is used to determine whether to start the ozone catalytic oxidation reactor.

[0116] S01A Get the current pH value of the reaction t , and compare the current reaction pH value pH t The maximum pH value is set to pH max , minimum pH value min Relationship:

[0117] If the current reaction pH value is pH t >Maximum pH value max , then stop adding alkali solution and continue to obtain the next moment reaction pH value pH t+1 ;

[0118] If the minimum pH min ≤ the current reaction pH value pH t ≤Maximum pH value max , then maintain the amount of alkali solution added and continue to obtain the next moment of the reaction pH value t+1 ;

[0119] If the current reaction pH value is pH t <Minimum pH value min , then according to the current reaction pH value pH t 、The current water flow rate f t And set the target pH value pH target Calculate the actual alkali solution demand, control the alkali solution supplier to add alkali solution to the inlet water according to the actual demand, and continuously obtain the pH value of the reaction at the next moment t+1 .

[0120] The maximum pH value max Meets: pH max =pH target +ΔpH;

[0121] The minimum pH value min Meets: pH min =pH target -ΔpH;

[0122] The target pH value is pH target It is determined according to the target COD removal rate and ozone utilization efficiency of water with different pollution types. The recommended value range is 7.5 to 10 and can be set; the value range of the reaction fine-tuning pH value ΔpH is 0.5.

[0123] By regulating the reaction pH value during the reaction process, the ozone catalytic oxidation reaction can be carried out under appropriate alkaline conditions, which can increase the ozone solubility and improve the ozone utilization rate. At the same time, a larger amount of hydroxyl free radicals are produced, and the organic matter is further neutralized and oxidized to carbon dioxide due to the acidification of water quality, thereby improving the forward movement of the catalytic reaction.

[0124] S01B Get the current reaction temperature T t , and compare the current reaction temperature T t With the set maximum temperature T max , minimum temperature T min Relationship:

[0125] If the current reaction temperature T t >Maximum temperature T max , then the temperature regulating module is controlled to cool down the raw water or ozone catalytic oxidation reactor, and the reaction temperature T at the next moment is continuously obtained. t+1 ;

[0126] If the minimum temperature T min ≤Current reaction temperature T t ≤Maximum temperature T max , then the temperature adjustment module is controlled to maintain the current temperature and continuously obtain the next moment reaction temperature T t+1 ;

[0127] If the current reaction temperature T t <Minimum temperature T min , the temperature regulating module is controlled to heat the raw water or ozone catalytic oxidation reactor, and the reaction temperature T at the next moment is continuously obtained. t+1 .

[0128] By regulating the reaction temperature during the reaction process, the ozone catalytic oxidation reaction can be carried out under appropriate temperature conditions to ensure that the ozone utilization efficiency is at a high level. When the reaction temperature is higher than 25°C, the ozone utilization efficiency begins to drop significantly; when the reaction water temperature exceeds 30 degrees, the ozone utilization rate and COD removal rate seriously deviate from the operating fixed investment curve.

[0129] Compared with the prior art, the present invention combines the ozone catalytic oxidation water treatment process and the ozone preparation process, and judges whether the current inlet COD concentration value belongs to high concentration, medium concentration or low concentration by comparing the relationship between the current inlet COD concentration value and the set high concentration threshold and low concentration threshold, and calculates the required amount of ozone in different ways according to the different concentration ranges to which it belongs, and controls the ozone generator to prepare the required amount of ozone and add it to the ozone catalytic oxidation reactor. This method can effectively improve the utilization rate of ozone, avoid the waste of ozone caused by manual addition and addition methods that do not distinguish concentrations, or the problem of unqualified effluent COD concentration caused by insufficient ozone addition, and at the same time, reduce the operating cost of sewage treatment. At the same time, the present invention monitors and adjusts the reaction pH value and reaction temperature while monitoring the current inlet COD concentration and effluent COD concentration to determine the ozone dosage, so that the conditions of the ozone oxidation reaction are maintained under suitable alkaline conditions and temperature conditions, so that ozone can achieve the highest utilization efficiency.

[0130] The terms used in the embodiments of the present application are only for the purpose of describing specific embodiments, and are not intended to limit the embodiments of the present application. The singular forms of "a", "said" and "the" used in the embodiments of the present application and the claims are also intended to include plural forms, unless the context clearly indicates other meanings. It should also be understood that, unless otherwise specified, "multiple" refers to two or more; the terms "first", "second", "third", etc. are only used to distinguish, rather than to describe a specific order or sequence, and cannot be understood as indicating or implying relative importance. The term "and / or" used herein refers to and includes any or all possible combinations of one or more associated listed items. When the above description relates to the drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. In the description of the present application, for those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to the specific circumstances.

[0131] The above-mentioned embodiments only express several implementation methods of the present invention, and the description is relatively specific and detailed, but it cannot be understood as limiting the scope of the invention patent. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the present invention, and the present invention is also intended to include these modifications and modifications.

Claims

1. A control system for ozone dosage, comprising: Ozone generator, detection module, valve module and controller, Ozone generator, to prepare ozone; The detection module includes a flow meter, a COD detector and a pH detector, wherein the flow meter detects the inlet flow rate of the ozone catalytic oxidation reactor; the COD detector detects the inlet COD concentration value of the raw water entering the ozone catalytic oxidation reactor and the effluent COD concentration value treated by the ozone catalytic oxidation reactor; the pH detector detects the pH value of the reaction liquid of the ozone catalytic oxidation reactor; The valve module includes a sampling valve, an ozone dosing valve and an alkali liquid control valve, wherein the sampling valve controls the amount of raw water entering the COD detector and the amount of sample liquid to be tested entering the COD detector from the ozone catalytic oxidation reactor; the ozone dosing valve is used to control the amount of ozone entering the ozone catalytic oxidation reactor; and the alkali liquid control valve controls the amount of alkali liquid entering the ozone catalytic oxidation reactor; A controller, electrically and / or communicatively connected to the valve module, the detection module, and the ozone generator; The controller obtains the required amount of ozone by the following method and then controls the amount of ozone produced by the ozone generator: Obtain the current influent COD concentration value, and compare the current influent COD concentration value with the set high concentration threshold and low concentration threshold: If the current inlet COD concentration value is greater than the high concentration threshold, the target COD removal rate adjustment mode is adopted to calculate the current COD removal rate and the target COD removal rate according to the current inlet COD concentration value, the current outlet COD concentration value, and the set target outlet COD concentration value; and determine whether the current COD removal rate is greater than the target COD removal rate. If yes, the required amount of ozone at the current moment is calculated in combination with the current inlet flow rate; wherein the required amount of ozone at the current moment satisfies: Where: Indicates the amount of ozone required at the current moment. Indicates the current influent COD concentration value. Indicates the current outlet COD concentration value. Indicates the target effluent COD concentration value, f t Indicates the water inflow at the current moment; If the current influent COD concentration value is less than or equal to the high concentration threshold and greater than or equal to the low concentration threshold, the unit water volume fixed ozone dosage adjustment mode is adopted to calculate the required ozone dosage at the current moment based on the average value of the ratio of the current influent flow rate and the unit water volume fixed ozone dosage obtained from system operation statistics; If the current inlet COD concentration value is less than the low concentration threshold, the outlet COD concentration value adjustment mode is adopted to calculate the required ozone amount at the current moment according to the current inlet COD concentration value, the current outlet COD concentration value, the current inlet flow rate, the set target outlet COD concentration value and the concentration correction coefficient α; At the same time, the current reaction pH value is obtained, and the relationship between the current reaction pH value and the set maximum pH value and minimum pH value is compared: If the current reaction pH value is greater than the maximum pH value, the addition of alkali solution is suspended; If the current reaction pH value is less than or equal to the maximum pH value and greater than or equal to the minimum pH value, the current alkali solution dosage is maintained; If the current reaction pH value is less than the minimum pH value, the actual alkali solution demand is calculated based on the current reaction pH value, the current inlet flow rate and the set target pH value, and the alkali solution supplier is controlled to add alkali solution to the inlet water according to the actual demand.

2. The control system according to claim 1, characterized in that: The target COD removal rate adjustment mode is specifically: Obtain the current outlet COD concentration value, calculate the current COD removal rate according to the current inlet COD concentration value and the current outlet COD concentration value, and determine whether the current COD removal rate is less than or equal to the set target COD removal rate: If yes, continue to obtain the influent COD concentration value at the next moment; If no, obtain the current inlet flow rate, calculate the required ozone amount at the current moment according to the current inlet COD concentration value, the current outlet COD concentration value, the set target outlet COD concentration value, and the current inlet flow rate, and continue to obtain the inlet COD concentration value at the next moment.

3. The control system according to claim 2, characterized in that: The COD removal rate at the current moment satisfies: Where: R t Indicates the COD removal rate at the current moment, Indicates the current influent COD concentration value. Indicates the current outlet COD concentration value; The target COD removal rate meets: Where: R target represents the target COD removal rate, It represents the mean value of the influent COD concentration of the system operation statistics. Indicates the target effluent COD concentration value.

4. The control system according to claim 1, characterized in that: The specific adjustment mode of the unit water volume fixed ozone dosage is: Get the current water flow rate, calculate the required ozone amount M at the current moment based on the average ratio of the unit water volume and the fixed ozone amount according to the system operation statistics. t O3 , continuously obtain the next moment of influent COD concentration value Among them, the amount of ozone required at the current moment satisfy: Where: Indicates the amount of ozone required at the current moment, R 均值 It represents the average value of the ratio of the amount of ozone per unit water in the system operation statistics, f t Indicates the water inflow rate at the current moment.

5. The control system according to claim 1, characterized in that: The effluent COD concentration value adjustment mode is specifically as follows: Obtain the current outlet COD concentration value and the current inlet flow rate, and calculate the amount of ozone required at the current moment based on the current inlet COD concentration value, the current outlet COD concentration value, the current inlet flow rate, the set target outlet COD concentration value and the concentration correction coefficient α. Continuously obtain the next moment of influent COD concentration value 6. The control system according to claim 5, characterized in that: The concentration correction factor satisfies: a=m COD / m O3 Where: α represents the concentration correction factor, m COD Indicates the amount of COD in the water at the last moment, m O3 Indicates the amount of ozone required at the last moment; The amount of ozone required at the current moment meets: Where: Indicates the amount of ozone required at the current moment. Indicates the current influent COD concentration value. Indicates the current outlet COD concentration value. Indicates the target effluent COD concentration value, f t Indicates the water inflow rate at the current moment.

7. The control system according to any one of claims 1 to 6, characterized in that: The control system also includes a temperature regulating module electrically or communicatively connected to the controller, and a pH thermometer for detecting the reaction temperature of the reaction liquid in the ozone catalytic oxidation reactor. In the process of the controller controlling the ozone generator to prepare ozone, the following steps are also included: Get the current reaction temperature, and compare the current reaction temperature with the set maximum temperature and minimum temperature: If the current reaction temperature is greater than the maximum temperature, the temperature regulating module is controlled to cool the raw water or the ozone catalytic oxidation reactor, and the reaction temperature at the next moment is continuously obtained; If the current reaction temperature is less than or equal to the maximum temperature and greater than or equal to the minimum temperature, the temperature adjustment module is controlled to maintain the current temperature and the reaction temperature at the next moment is continuously obtained; If the reaction temperature at the current moment is lower than the minimum temperature, the temperature regulating module is controlled to increase the temperature of the raw water or the ozone catalytic oxidation reactor, and the reaction temperature at the next moment is continuously obtained.

8. The control system according to claim 7, characterized in that: The control system also includes a level meter electrically or communicatively connected to the controller for detecting the liquid level of the raw water pool, and before starting the control of the ozone dosage, it also includes: Get the current liquid level value of the raw water tank, and compare the current liquid level with the set high liquid level threshold and low liquid level threshold: If the current liquid level value is less than the low liquid level threshold, the ozone catalytic oxidation reactor is controlled to shut down; If the current liquid level value is less than or equal to the high liquid level threshold and greater than or equal to the low liquid level threshold, the start and stop information of the ozone catalytic oxidation reactor is sent to the user end, and the start and stop of the ozone catalytic oxidation reactor is controlled according to the start and stop instructions transmitted by the user end; If the liquid level value at the current moment is greater than the high liquid level threshold, the control system for controlling the ozone catalytic oxidation reactor and the ozone dosage is started.

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