An automatic dosing control method based on residual chlorine value of sewage

Abstract

The present invention relates to the technical field of sewage treatment, and discloses an automatic dosing control method based on the residual chlorine value of sewage, including a sedimentation tank, two disinfection tanks, a dosing component, a monitoring component and a control component. The sedimentation tank is used to precipitate and separate impurities and foreign matter in the sewage. The sedimentation tank and the two disinfection tanks are respectively connected by two pipes, and a sewage inlet is fixedly connected to one side of the sedimentation tank. This automatic dosing control method based on the residual chlorine value of sewage enables the two disinfection tanks to communicate and interact after the two disinfection tanks react, and compensates and offsets the sewage in the disinfection tank with unqualified residual chlorine value by using high to supplement low and low to eliminate high, thereby reducing the number of direct dosing and introduction of sewage before the reaction, avoiding excessive dosing times and thus saving the reaction time of the agent and sewage, and is flexible to use according to different situations. Both disinfection tanks can independently cooperate with the front and back processes to treat sewage.

Description

Technical Field

[0001] The invention relates to the technical field of sewage treatment, and in particular to an automatic dosing control method based on the residual chlorine value of sewage. Background Art

[0002] Residual chlorine refers to the chlorine remaining in water after it is mixed and contacted with chlorine-based disinfectants. Due to the use of chlorine for disinfection, it is necessary to maintain a certain concentration in the water. Too low a concentration does not have the ability to kill bacteria, and excessive concentrations can cause serious damage to the human body and the environment, and make the pH value of the water unstable.

[0003] Some existing sewage treatment equipment only has one disinfection pool in the disinfection process to disinfect the sewage, or although multiple disinfection pools are set up, there is no interconnection and interaction between the several disinfection pools. One disinfection pool only works as a separate treatment process, which is inefficient. When the residual chlorine value is unqualified, it can only be treated with drugs or water. Multiple additions of drugs or water require corresponding waiting time for the consumption reaction, resulting in low sewage treatment efficiency.

[0004] In this regard, the present invention proposes an automatic dosing control method based on the residual chlorine value of sewage to solve this problem. Summary of the invention

[0005] Technical issues solved

[0006] In view of the shortcomings of the prior art, the present invention provides an automatic dosing control method based on the residual chlorine value of sewage. The method has the advantages of connecting and interacting the two disinfection pools when a variety of residual chlorine values ​​are generated after the reaction of the two disinfection pools to determine whether they meet the standards or not, and compensating and offsetting the sewage in the disinfection pool with unqualified residual chlorine values ​​by using high to supplement low and low to eliminate high, thereby solving the problem of excessive dosing times that consumes a large amount of reaction time between the agent and the sewage.

[0007] (II) Technical solution

[0008] In order to achieve the purpose of compensating and offsetting the sewage in the disinfection pool with unqualified residual chlorine value by using high to compensate low and low to eliminate high, the present invention provides the following technical scheme: comprising a sedimentation tank, two disinfection tanks, a dosing component, a monitoring component and a control component, the two disinfection tanks are interconnected by two pipes, the impurities and foreign matter in the sewage are precipitated and separated by the sedimentation tank, the sedimentation tank and the two disinfection tanks are respectively connected by two pipes, one side of the sedimentation tank is fixedly connected with a sewage inlet, the dosing component is respectively connected with the inside of the two disinfection tanks through pipes, one side of the two disinfection tanks is respectively provided with a water outlet pipe, the dosing component comprises a dosing pump and a drug outlet pipe, a drug outlet flowmeter is installed on the drug outlet pipe, the monitoring component comprises a residual chlorine detection device and a data transmission device, and the control component comprises a control panel, a data processor and a PLC controller;

[0009] An automatic dosing control method based on the residual chlorine value of sewage comprises the following steps:

[0010] 1) Introducing sewage into the sedimentation tank, adding flocculants into the sedimentation tank, and introducing the filtered water into two disinfection tanks respectively after flocculation and filtration;

[0011] 2) After the sewage is introduced into the two disinfection tanks, the water level information detected by the water level sensor is calculated by the data processor to obtain the amount of sewage introduced, and the required amount of the corresponding disinfectant is calculated, and the control component controls the dosing component to add the sewage in the disinfection tank and stir and mix it through the stirring device;

[0012] 3) After the reagent and sewage are mixed in the disinfection tank for a certain period of time, the residual chlorine value of the sewage in the two disinfection tanks monitored by the monitoring device is transmitted back to the data processor and the control panel through the data transmission device. When the residual chlorine value is qualified, the control component controls the solenoid valve to open so that the sewage with qualified residual chlorine value enters the next process, and repeats steps 1-3 to disinfect the sewage;

[0013] 4) When the residual chlorine value in one of the disinfection pools is qualified and the residual chlorine value in the other disinfection pool is lower, the sewage in the disinfection pool with qualified residual chlorine value is discharged to the next process and steps 1-3 are repeated to disinfect the sewage, the amount of medicine to be added to the disinfection pool with unqualified residual chlorine value is calculated by the data processor, and the dosing component is controlled by the control component to perform the dosing reaction until the residual chlorine value in the disinfection pool is qualified, the control component controls the solenoid valve to open so that the sewage with qualified residual chlorine value enters the next process, and steps 1-3 are repeated to disinfect the sewage;

[0014] 5) When the residual chlorine value in one of the disinfection pools is qualified and the residual chlorine value in the other disinfection pool is higher, the sewage in the disinfection pool with qualified residual chlorine value is discharged to the next process and steps 1-3 are repeated to disinfect the sewage. The amount of sewage that needs to be added to the disinfection pool with unqualified residual chlorine value is calculated by the data processor, and the solenoid valve is controlled to introduce the sewage from the sedimentation tank into the disinfection pool for reaction until the residual chlorine value in the disinfection pool is qualified, and then the sewage is discharged to the next process and steps 1-3 are repeated to disinfect the sewage;

[0015] 6) When the residual chlorine value in one of the disinfection pools is low, while the residual chlorine value in the other disinfection pool is high, the solenoid valves of the pipes connecting the two disinfection pools are controlled by the control component to introduce the sewage in the disinfection pool with a higher residual chlorine value into the disinfection pool with a lower residual chlorine value and wait for the reaction, and introduce the sewage from the sedimentation tank into the disinfection pool with a higher residual chlorine value for reaction until the residual chlorine values ​​in the two disinfection pools are qualified, and then discharge to the next process and repeat steps 1-3 to disinfect the sewage. The purpose of not adding medicine directly into the disinfection pool with a lower residual chlorine value is to prevent excessive addition of medicine at one time, which requires the secondary introduction of sewage and waiting for the reaction;

[0016] 7) When the residual chlorine values ​​in the two disinfection pools are both low, the amount of medicine that needs to be added to the disinfection pool with unqualified residual chlorine value is calculated by the data processor, and the dosing component is controlled by the control component to perform the dosing reaction until the residual chlorine value in the disinfection pool is qualified. The control component controls the solenoid valve to open so that the sewage with qualified residual chlorine value enters the next process, and repeats steps 1-3 to disinfect the sewage;

[0017] 8) When the residual chlorine values ​​in the two disinfection pools are high, the data processor calculates the amount of sewage that needs to be added again to the disinfection pool with unqualified residual chlorine value, controls the solenoid valve to introduce sewage from the sedimentation tank into the disinfection pool for reaction, until the residual chlorine values ​​in the two disinfection pools are qualified, and then discharges it to the next process and repeats steps 1-3 to disinfect the sewage.

[0018] Preferably, solenoid valves are provided on the pipes connecting the sedimentation tank, the disinfection tank and the dosing assembly, and the solenoid valves are electrically connected to the PLC controller to control the on-off of the pipes.

[0019] Preferably, a filter screen is provided in the sedimentation tank, through which impurities in the sewage are filtered to prevent them from entering the disinfection tank, and flocculants are added to the sedimentation tank during operation.

[0020] Preferably, a stirring device is provided inside the two disinfection pools to stir and mix the sewage and the added medicine introduced into the disinfection pools, and a water level sensor is installed in the disinfection pools to detect the water level inside the disinfection pools.

[0021] Preferably, the dosing component, the monitoring component, the control component and the water level sensor are electrically connected via wires, and the dosing component, the monitoring component and the water level sensor are controlled and information is displayed via the control panel.

[0022] (III) Beneficial effects

[0023] Compared with the prior art, the present invention provides an automatic dosing control method based on the residual chlorine value of sewage, which has the following beneficial effects:

[0024] This automatic dosing control method based on the residual chlorine value of sewage, by setting two interconnected disinfection pools in the post-process of the sedimentation tank, can make the two disinfection pools connected and interactive when a variety of residual chlorine values ​​are generated after the reaction of the two disinfection pools, and whether they meet the standards or not. The sewage in the disinfection pool with unqualified residual chlorine values ​​is compensated and offset in a manner of high-to-low compensation and low-to-high compensation, thereby reducing the number of direct dosing and introduction of pre-reaction sewage, avoiding excessive dosing times and thus saving the reaction time between the agent and sewage. It is also flexible to use according to different situations, and the two disinfection pools can independently cooperate with the previous and next processes to treat sewage, which is more efficient. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 is a system diagram of the present invention;

[0026] Figure 2 It is the work flow chart of the present invention. DETAILED DESCRIPTION

[0027] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0028] like Figure 1-Figure 2As shown, an automatic dosing control method based on the residual chlorine value of sewage includes a sedimentation tank, two disinfection tanks, a dosing component, a monitoring component and a control component. The two disinfection tanks are connected to each other through two pipes. The impurities and foreign matter in the sewage are precipitated and separated through the sedimentation tank. The sedimentation tank and the two disinfection tanks are respectively connected through two pipes. One side of the sedimentation tank is fixedly connected with a sewage inlet. The dosing component is connected with the inside of the two disinfection tanks through pipes. One side of the two disinfection tanks is respectively provided with a water outlet pipe. The dosing component includes a dosing pump and a drug outlet pipe. A drug outlet flowmeter is installed on the drug outlet pipe. The monitoring component includes a residual chlorine detection device and a data transmission device. The control component The components include a control panel, a data processor and a PLC controller. A one-way valve is provided between the connecting pipes of each component to prevent backflow during the sewage circulation process. The data processor needs to be used in conjunction with a computer and related mature software programs. The existing known technology can be realized and therefore no further description is given. The drug outlet pipe is plugged into the top wall inside the disinfection tank. The speed, drug outlet amount, etc. of the drug pump are controlled by the PLC controller and the drug outlet flow meter. The actual drug outlet amount required is calculated by the data processor according to the residual chlorine value detected by the residual chlorine detector, and the PLC controller, the residual chlorine detection device and the drug outlet pump and other equipment in the present invention all use existing mature equipment on the market;

[0029] An automatic dosing control method based on the residual chlorine value of sewage comprises the following steps:

[0030] 1) The sewage is introduced into the sedimentation tank, and flocculants are added into the sedimentation tank. After flocculation and filtration, the filtered water is introduced into two disinfection tanks respectively;

[0031] 2) After the sewage is introduced into the two disinfection tanks, the water level information detected by the water level sensor is calculated by the data processor to obtain the amount of sewage introduced, and the required amount of the corresponding disinfectant is calculated. The control component controls the dosing component to add the sewage in the disinfection tank and mixes it through the stirring device;

[0032] 3) After the reagent and sewage are mixed in the disinfection tank for a certain period of time, the residual chlorine value of the sewage in the two disinfection tanks monitored by the monitoring device is transmitted back to the data processor and the control panel through the data transmission device. When the residual chlorine value is qualified, the control component controls the solenoid valve to open so that the sewage with qualified residual chlorine value enters the next process, and repeats steps 1-3 to disinfect the sewage;

[0033] 4) When the residual chlorine value in one of the disinfection pools is qualified and the residual chlorine value in the other disinfection pool is lower, the sewage in the disinfection pool with qualified residual chlorine value is discharged to the next process and steps 1-3 are repeated to disinfect the sewage, the amount of medicine to be added to the disinfection pool with unqualified residual chlorine value is calculated by the data processor, and the dosing component is controlled by the control component to perform the dosing reaction until the residual chlorine value in the disinfection pool is qualified, the control component controls the solenoid valve to open so that the sewage with qualified residual chlorine value enters the next process, and steps 1-3 are repeated to disinfect the sewage;

[0034] 5) When the residual chlorine value in one of the disinfection pools is qualified and the residual chlorine value in the other disinfection pool is higher, the sewage in the disinfection pool with qualified residual chlorine value is discharged to the next process and steps 1-3 are repeated to disinfect the sewage. The amount of sewage that needs to be added to the disinfection pool with unqualified residual chlorine value is calculated by the data processor, and the solenoid valve is controlled to introduce the sewage from the sedimentation tank into the disinfection pool for reaction until the residual chlorine value in the disinfection pool is qualified, and then the sewage is discharged to the next process and steps 1-3 are repeated to disinfect the sewage;

[0035] 6) When the residual chlorine value in one of the disinfection pools is low, while the residual chlorine value in the other disinfection pool is high, the solenoid valves of the pipes connecting the two disinfection pools are controlled by the control component to introduce the sewage in the disinfection pool with a higher residual chlorine value into the disinfection pool with a lower residual chlorine value and wait for the reaction, and introduce the sewage from the sedimentation tank into the disinfection pool with a higher residual chlorine value for reaction until the residual chlorine values ​​in the two disinfection pools are qualified, and then discharge to the next process and repeat steps 1-3 to disinfect the sewage. The purpose of not adding medicine directly into the disinfection pool with a lower residual chlorine value is to prevent excessive addition of medicine at one time, requiring the secondary introduction of sewage and waiting for the reaction, thereby saving reaction time;

[0036] 7) When the residual chlorine values ​​in the two disinfection pools are both low, the amount of medicine that needs to be added to the disinfection pool with unqualified residual chlorine value is calculated by the data processor, and the dosing component is controlled by the control component to perform the dosing reaction until the residual chlorine value in the disinfection pool is qualified. The control component controls the solenoid valve to open so that the sewage with qualified residual chlorine value enters the next process, and repeats steps 1-3 to disinfect the sewage;

[0037] 8) When the residual chlorine values ​​in the two disinfection pools are high, the data processor calculates the amount of sewage that needs to be added again to the disinfection pool with unqualified residual chlorine value, controls the solenoid valve to introduce sewage from the sedimentation tank into the disinfection pool for reaction, until the residual chlorine values ​​in the two disinfection pools are qualified, and then discharges it to the next process and repeats steps 1-3 to disinfect the sewage.

[0038] Solenoid valves are installed on the pipes connecting the sedimentation tank, disinfection tank and dosing components. The solenoid valves are electrically connected to the PLC controller to control the on-and-off of the pipes, and cooperate with the data processor and related equipment to control the opening and closing of the solenoid valves. Water pumps and other related equipment should be installed between each pipe to avoid poor circulation due to insufficient pressure.

[0039] A filter is installed in the sedimentation tank, through which impurities in the sewage are filtered to prevent them from entering the disinfection tank. Flocculants are added to the sedimentation tank during operation. The added flocculants are divided into two categories: inorganic multivalent metal salts and organic high molecular polymers. The former is mainly composed of aluminum salts and iron salts, and the latter is mainly polyacrylamide and its deformation products. Commonly used inorganic salts include polyaluminum chloride and ferrous sulfate, and the organic one is polyacrylamide (PAM).

[0040] Both disinfection pools are provided with stirring devices to stir and mix the sewage and the added medicines introduced into the disinfection pools, and water level sensors are installed in the disinfection pools to detect the water levels inside the disinfection pools. The stirring devices are driven by motors, and the motors are connected and controlled by control components. The water level sensor detects the water level inside the disinfection pools and calculates the amount of water inside the disinfection pools through the cooperation of the data processor and related components, and controls the amount of medicine added by calculating the amount of medicine based on the measured amount of water.

[0041] The dosing component, monitoring component, control component and water level sensor are electrically connected through wires, and the dosing component, monitoring component and water level sensor are controlled and information is displayed through the control panel. The power supply of the above-mentioned electrical equipment can be selected from an external power supply or a mobile power supply according to actual conditions. The transmission of information between devices is realized by the wires or wireless transmission devices connected between them, and is realized using existing mature technologies. Various data collected and calculated by each device are displayed on the control panel. The operator can directly view the data according to the control panel, or manually change various data such as water diversion amount and dosing amount through the control panel.

[0042] The beneficial effects of the present invention are as follows: the automatic dosing control method based on the residual chlorine value of sewage, by arranging two interconnected disinfection pools in the post-process of the sedimentation tank, can make the two disinfection pools connected and interactive when a variety of residual chlorine values ​​are generated after the reaction of the two disinfection pools and whether they meet the standards or not, and the sewage in the disinfection pool with unqualified residual chlorine values ​​is compensated and offset in a manner of high supplementing low and low eliminating high, thereby reducing the number of direct dosing and introduction of sewage before the reaction, avoiding excessive dosing times and thus saving the reaction time of the agent and sewage, and the method is flexible to use according to different situations, and the two disinfection pools can independently cooperate with the previous and next processes to treat sewage, which is more efficient.

[0043] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An automatic dosing control method based on the residual chlorine value of sewage, characterized in that: It comprises a sedimentation tank, two disinfection tanks, a dosing component, a monitoring component and a control component. The two disinfection tanks are interconnected by two pipes. The impurities and foreign matters in the sewage are precipitated and separated by the sedimentation tank. The sedimentation tank and the two disinfection tanks are respectively connected by two pipes. One side of the sedimentation tank is fixedly connected with a sewage inlet. The dosing component is respectively connected with the inside of the two disinfection tanks through pipes. One side of the two disinfection tanks is respectively provided with a water outlet pipe. The dosing component comprises a dosing pump and a drug outlet pipe. A drug outlet flowmeter is installed on the drug outlet pipe. The monitoring component comprises a residual chlorine detection device and a data transmission device. The control component comprises a control panel, a data processor and a PLC controller. An automatic dosing control method based on the residual chlorine value of sewage comprises the following steps: 1) Introducing sewage into the sedimentation tank, adding flocculants into the sedimentation tank, and introducing the filtered water into two disinfection tanks respectively after flocculation and filtration; 2) After the sewage is introduced into the two disinfection tanks, the water level information detected by the water level sensor is calculated by the data processor to obtain the amount of sewage introduced, and the required amount of the corresponding disinfectant is calculated, and the control component controls the dosing component to add the sewage in the disinfection tank and stir and mix it through the stirring device; 3) After the reagent and sewage are mixed in the disinfection tank for a certain period of time, the residual chlorine value of the sewage in the two disinfection tanks monitored by the monitoring device is transmitted back to the data processor and the control panel through the data transmission device. When the residual chlorine value is qualified, the control component controls the solenoid valve to open so that the sewage with qualified residual chlorine value enters the next process, and repeats steps 1-3 to disinfect the sewage; 4) When the residual chlorine value in one of the disinfection pools is qualified and the residual chlorine value in the other disinfection pool is lower, the sewage in the disinfection pool with qualified residual chlorine value is discharged to the next process and steps 1-3 are repeated to disinfect the sewage, the amount of medicine to be added to the disinfection pool with unqualified residual chlorine value is calculated by the data processor, and the dosing component is controlled by the control component to perform the dosing reaction until the residual chlorine value in the disinfection pool is qualified, the control component controls the solenoid valve to open so that the sewage with qualified residual chlorine value enters the next process, and steps 1-3 are repeated to disinfect the sewage; 5) When the residual chlorine value in one of the disinfection pools is qualified and the residual chlorine value in the other disinfection pool is higher, the sewage in the disinfection pool with qualified residual chlorine value is discharged to the next process and steps 1-3 are repeated to disinfect the sewage. The amount of sewage that needs to be added to the disinfection pool with unqualified residual chlorine value is calculated by the data processor, and the solenoid valve is controlled to introduce the sewage from the sedimentation tank into the disinfection pool for reaction until the residual chlorine value in the disinfection pool is qualified, and then the sewage is discharged to the next process and steps 1-3 are repeated to disinfect the sewage; 6) When the residual chlorine value in one of the disinfection pools is low, while the residual chlorine value in the other disinfection pool is high, the solenoid valves of the pipes connecting the two disinfection pools are controlled by the control component to introduce the sewage in the disinfection pool with a higher residual chlorine value into the disinfection pool with a lower residual chlorine value and wait for the reaction, and introduce the sewage from the sedimentation tank into the disinfection pool with a higher residual chlorine value for reaction until the residual chlorine values ​​in the two disinfection pools are qualified, and then discharge to the next process and repeat steps 1-3 to disinfect the sewage. The purpose of not adding medicine directly into the disinfection pool with a lower residual chlorine value is to prevent excessive addition of medicine at one time, requiring the secondary introduction of sewage and waiting for the reaction, thereby saving reaction time; 7) When the residual chlorine values ​​in the two disinfection pools are both low, the amount of medicine that needs to be added to the disinfection pool with unqualified residual chlorine value is calculated by the data processor, and the dosing component is controlled by the control component to perform the dosing reaction until the residual chlorine value in the disinfection pool is qualified. The control component controls the solenoid valve to open so that the sewage with qualified residual chlorine value enters the next process, and repeats steps 1-3 to disinfect the sewage; 8) When the residual chlorine values ​​in the two disinfection pools are high, the data processor calculates the amount of sewage that needs to be added again to the disinfection pool with unqualified residual chlorine value, controls the solenoid valve to introduce sewage from the sedimentation tank into the disinfection pool for reaction, until the residual chlorine values ​​in the two disinfection pools are qualified, and then discharges it to the next process and repeats steps 1-3 to disinfect the sewage.

2. The automatic dosing control method based on the residual chlorine value of sewage according to claim 1 is characterized in that: The pipelines connecting the sedimentation tank, the disinfection tank and the dosing assembly are all provided with solenoid valves, and the solenoid valves are all electrically connected to the PLC controller to control the on-off of the pipelines.

3. The automatic dosing control method based on the residual chlorine value of sewage according to claim 1 is characterized in that: A filter screen is provided in the sedimentation tank, through which impurities in sewage are filtered to prevent them from entering the disinfection tank. Flocculants are added to the sedimentation tank during operation.

4. The automatic dosing control method based on the residual chlorine value of sewage according to claim 1 is characterized in that: The two disinfection pools are both provided with stirring devices to stir and mix the sewage and the added medicine introduced into the disinfection pools, and the disinfection pools are installed with water level sensors to detect the water levels inside the disinfection pools.

5. The automatic dosing control method based on the residual chlorine value of sewage according to claim 4 is characterized in that: The dosing component, the monitoring component, the control component and the water level sensor are electrically connected via wires, and the dosing component, the monitoring component and the water level sensor are controlled and information is displayed via the control panel.

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