CN111672172A - Method and system for controlling backwashing duration of filter tank - Google Patents
Method and system for controlling backwashing duration of filter tank Download PDFInfo
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- CN111672172A CN111672172A CN202010335467.7A CN202010335467A CN111672172A CN 111672172 A CN111672172 A CN 111672172A CN 202010335467 A CN202010335467 A CN 202010335467A CN 111672172 A CN111672172 A CN 111672172A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D24/00—Filters comprising loose filtering material, i.e. filtering material without any binder between the individual particles or fibres thereof
- B01D24/48—Filters comprising loose filtering material, i.e. filtering material without any binder between the individual particles or fibres thereof integrally combined with devices for controlling the filtration
- B01D24/4853—Filters comprising loose filtering material, i.e. filtering material without any binder between the individual particles or fibres thereof integrally combined with devices for controlling the filtration by clearness or turbidity measuring
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D24/00—Filters comprising loose filtering material, i.e. filtering material without any binder between the individual particles or fibres thereof
- B01D24/46—Regenerating the filtering material in the filter
- B01D24/4631—Counter-current flushing, e.g. by air
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D24/00—Filters comprising loose filtering material, i.e. filtering material without any binder between the individual particles or fibres thereof
- B01D24/48—Filters comprising loose filtering material, i.e. filtering material without any binder between the individual particles or fibres thereof integrally combined with devices for controlling the filtration
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D37/00—Processes of filtration
- B01D37/04—Controlling the filtration
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D37/00—Processes of filtration
- B01D37/04—Controlling the filtration
- B01D37/041—Controlling the filtration by clearness or turbidity measuring
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Abstract
The invention provides a method and a system for controlling the backwashing duration of a filter tank, wherein after filter materials in the filter tank are filtered, the method sequentially performs air flushing and water flushing on the filter tank, performs turbidity detection on backwashing wastewater by using an online turbidity detection device arranged at a backwashing wastewater tank of the filter tank, and stops water flushing when a detection value is lower than a set value; and repeating the steps for a plurality of times, and detecting the mud content of the filter material expressed by turbidity to control the time length of the next backwashing. The system comprises an online turbidity detection device, a filter material mud content detection unit represented by turbidity, a backwashing water pump and an air pump, wherein the online turbidity detection device and the filter material mud content detection unit represented by turbidity are respectively connected with two sensors, each sensor is connected with a controller of the backwashing water pump and the air pump, and the on-off of the backwashing water pump and the air pump is controlled by received turbidity information and the filter material mud content information represented by turbidity. The invention has the advantages of water consumption and medicine consumption saving and simple operation.
Description
Technical Field
The invention relates to the field of drinking water treatment, in particular to a method and a system for controlling the backwashing duration of a filter tank.
Technical Field
In recent years, with the pace of urban construction and the advance of environmental protection, the quality of drinking water supplied by water purification plants has attracted more and more attention. The filtration is a core unit of the drinking water treatment process and is the final link of particulate matter and turbidity removal. The quality of the filtering link (the quality of the filtered water) depends on the backwashing quality of the filter tank to a great extent. Backwashing is crucial to the filtration operation: if the backwashing strength or the washing time is not enough, the sludge in the filter layer cannot be removed in time, and when the sludge is accumulated more, the filter material and the sludge are bonded together, so that the filtering process is seriously deteriorated; if the backwashing strength is too high or the backwashing duration is too long, not only the water consumption is large and uneconomical, but also the fine filter material is lost, even the cobbles on the supporting layer at the bottom are dislocated, and the phenomenon of filter material leakage is caused to influence the water quality of the filtered water. The key points of the back washing are as follows: the proper backwash intensity (or expansion rate) and proper washing time are controlled. The backwashing strength can be conveniently and quickly adjusted by controlling the strength of the backwashing pump, but the backwashing time cannot be accurately controlled, and sometimes the turbidity of the backwashing wastewater is reduced, but in fact, the sludge on the surface of the filter material is not loosened by air due to insufficient washing time, and the sludge cannot be washed down by backwashing water. The problem to be solved is urgently needed how to control the back washing time and ensure the washing effect to reach the standard so as to achieve the purpose of saving energy.
Disclosure of Invention
Aiming at the problem of the control of the backwashing time of the filter tank, the invention aims to improve the prior art and provide a method and a system for controlling the backwashing time of the filter tank, which can improve the backwashing efficiency on the basis of the prior backwashing, enhance the reliability of the backwashing effect, effectively solve the problem that the backwashing effect of the filter tank of a drinking water plant is poor or the backwashing time is too long and resources are wasted, and realize the purposes of energy conservation and consumption reduction. The method and the system for controlling the backwashing duration of the filter tank are particularly suitable for air/water combined backwashing filter tanks.
In order to achieve the purpose, the invention adopts the technical scheme that:
the invention provides a method for controlling the backwashing duration of a filter tank, which is characterized in that the filter tank is a gas/water combined backwashing filter tank; the method for controlling the backwashing duration of the filter tank comprises the following steps:
1) an online turbidity detection device is arranged at a backwashing wastewater tank of the filter; setting a turbidity critical value of the backwashing wastewater according to the use scene of the filter;
2) filtering the filter material in the filter tank according to a set time length t 1; after filtering, performing air blasting on the filter until reaching an air blasting time length t2 set according to a use scene; flushing the filter tank with water, performing turbidity detection on wastewater in a backwashing wastewater tank by using the online turbidity detection device until the turbidity of the wastewater is lower than the turbidity critical value of the backwashing wastewater set in the step 1), recording the water washing time t3 after the air flush is finished, and stopping backwashing;
3) continuously repeating the operation of the step 2) until the set time T is reached, and executing the step 4);
4) detecting the mud content of the filter material in the filter tank by using turbidity, and if the mud content of the filter material expressed by turbidity is too low, reducing the time length of the next backwashing, and returning to the step 2); if the mud content of the filter material represented by the turbidity is too high, increasing the time length of the next backwashing, and returning to the step 2); if the mud content of the filter material represented by the turbidity meets the set requirement, setting the next backwashing time length to be equal to the current backwashing time length, namely setting the next backwashing time length to be t2+ t3, and returning to the step 2);
the relationship between the filter material mud content and the next backwashing time length expressed by the turbidity is shown in the following table:
| turbidity of water | Duration of next backwashing |
| 0-30ntu | The backwashing time is reduced by 5 percent |
| 30-60ntu | The backwashing duration is not changed |
| 60-120ntu | The backwashing time is increased by 5 percent |
| >120ntu | The backwashing time is increased by 10 percent |
| >300ntu | The backwashing time is increased by 15 percent |
。
The invention also provides a system according to the method for controlling the backwashing duration of the filter tank, which is characterized by comprising an online turbidity detection device, a filter material mud content detection unit represented by turbidity, a first sensor, a second sensor, a backwashing water pump and a backwashing air pump, wherein the online turbidity detection device is arranged in a backwashing wastewater tank of the filter tank and is used for judging the mud content of the filter material in the filter tank; the first sensor is used for receiving the turbidity information of the wastewater in the backwashing wastewater tank collected by the online turbidity detection device and transmitting the turbidity information to the controller of the backwashing water pump so as to control the switch of the backwashing water pump; the second sensor is used for receiving the information of the sludge content of the filter material detected by the turbidity-expressed filter material sludge content detection unit, and transmitting the information of the sludge content of the filter material expressed by turbidity to the controller of the backwashing water pump and the controller of the backwashing air pump, so that the backwashing water pump and the backwashing air pump are controlled to be switched on and off.
The invention has the following characteristics and beneficial effects:
the backwashing time of the filter is improved from fixed time determined by experience to variable time determined in real time according to the turbidity of the backwashing, and the detection of the sludge content of the filter material expressed by the turbidity ensures that the turbidity of the backwashing wastewater reaches the standard and is carried out under the condition of complete washing. The invention can ensure the backwashing effect of the filter tank, saves water consumption and medicine consumption, and plays an important role in saving energy, reducing consumption and improving the quality of filtered water and even factory water in a filtering period. In addition, the invention has simple operation and low requirement on equipment, and can be used for a long time.
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FIG. 1 is a flow chart of a method for controlling the backwashing duration of a filter tank provided by the invention.
FIG. 2 is a schematic structural diagram of a filter backwashing duration control system based on the control method of the invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the detailed description and specific examples, while indicating the scope of the invention, are intended for purposes of illustration only and are not intended to limit the scope of the invention.
In order to better understand the invention, the following detailed description explains an application example of the method and the system for controlling the backwashing time length of the filter tank provided by the invention.
Referring to fig. 1, the method for controlling the backwashing duration of the filter tank provided by the invention specifically comprises the following steps:
1) an online turbidity detection device is arranged at a backwashing wastewater tank of the air/water combined backwashing filter; and setting a critical value of the turbidity of the backwash wastewater according to the use scene of the air/water combined backwash filter.
Referring to fig. 2, in this embodiment, an online turbidity detection device (turbidity meter 3 is used in this embodiment) is installed at the water flow moderating position of the backwashing wastewater tank 2 of the air/water combined backwashing filter 1, and the critical value of the turbidity of the backwashing wastewater is set to 15 NTU. The turbidity meter is connected with a controller of the backwashing water pump through a first sensor and is used for controlling the starting and stopping of the backwashing water pump through the real-time turbidity change. The controllers of the backwashing water pump and the backwashing air pump are also connected with a second sensor and used for transmitting a signal indicating whether the mud content of the filter material expressed by the turbidity reaches the standard or not, and sequentially controlling the start and stop of the backwashing air pump and the backwashing water pump.
2) Filtering the filter material in the gas/water combined backwashing filter tank according to a set time length t 1; after filtering, carrying out air blasting on the air/water combined backwashing filter until the air blasting time t2 set according to the use scene is reached; carrying out water flushing on the air/water combined backwashing filter tank, carrying out turbidity detection on the wastewater in the backwashing wastewater tank by using an online turbidity detection device until the turbidity of the wastewater is lower than the turbidity critical value of the backwashing wastewater set in the step 1), recording the water washing time t3 after the air flushing is finished, and stopping backwashing. For example, the set time period t1 for filtering the filter material may be 23h, and the sum of t1 and t2 may be 1 h.
3) Continuously repeating the operation of the step 2) until the set time T is reached, and executing the step 4).
4) Carrying out filter material mud content detection expressed by turbidity on the filter material in the air/water combined backwashing filter, if the filter material mud content expressed by turbidity is too low, reducing the next backwashing time length, and returning to the step 2); if the mud content of the filter material represented by the turbidity is too high, increasing the time length of the next backwashing, and returning to the step 2); if the mud content of the filter material represented by the turbidity meets the set requirement, setting the next backwashing time length to be equal to the current backwashing time length (namely, setting the next backwashing time length to be t2+ t3), and returning to the step 2). The step suggests once a month to once a quarter, namely, the set time T in the step 3) is 1 month to 1 quarter, so that the cleanliness of the filter material is ensured.
In this embodiment, the detection of the mud content of the filter material expressed by the turbidity is mainly used to determine whether the previous air blasting process is sufficient on the basis of reaching the standard of water blasting. The filter material mud content represented by the turbidity cannot be detected on line, and after the detection is required in a laboratory, the second sensor is simultaneously connected with a controller of a backwashing water pump and a controller of a backwashing air pump to transmit a signal indicating whether the filter material mud content represented by the turbidity reaches the standard or not. In this embodiment, the specific process of detecting the mud content of the filter material expressed by the turbidity is as follows:
taking a filter material sample from the air/water combined backwashing filter tank, putting the filter material sample into a sampling bag, and shaking the sampling bag to ensure that the filter material sample is fully mixed. Using a 100mL graduated cylinder, 50mL of filter material sample was taken from the sampling bag. This 50mL sample of filter material was transferred to a 500mL flask. To the flask was added 50mL of tap water and shaken for 60 seconds until the filter material sample was thoroughly mixed with the tap water. This mixed turbid water was poured into a 500mL beaker. The above procedure was repeated four more times until there was a 500mL sample of turbid water in the beaker. After the 500mL turbid water sample is uniformly mixed by stirring, a turbidity measurement value is obtained by a turbidity meter, and the turbidity value is multiplied by two to be used as a turbidity value of a filter material sample and recorded.
To avoid measurement errors, the measurement can be repeated multiple times according to the above steps and the average value can be taken as the final turbidity value of the filter material sample. How much the backwashing effect is judged according to the following table. The evaluation criteria are as follows:
| turbidity of water | Condition of filter material | Duration of next backwashing |
| 0-30ntu | Too clean | The backwashing time is reduced by 5 percent |
| 30-60ntu | Clean and best performance | The backwashing duration is not changed |
| 60-120ntu | Slight dirty | The backwashing time is increased by 5 percent |
| >120ntu | Zang organs | The backwashing time is increased by 10 percent |
| >300ntu | Extreme dirts | The backwashing time is increased by 15 percent |
The invention also provides a filter backwashing duration control system based on the control method, and referring to fig. 2, the system comprises an online turbidity detection device 3, a filter material mud content detection unit represented by turbidity (the filter material mud content detection unit represented by turbidity is not shown in the figure), a backwashing water pump and a backwashing air pump (the backwashing water pump and the air pump are not shown in the figure), the online turbidity detection device 3 is arranged in a backwashing wastewater tank 2 of the air/water combined backwashing filter 1, the filter material mud content detection unit represented by turbidity is used for judging the cleaning condition of the filter material in the air/water combined backwashing filter 1, the online turbidity detection device is connected with a first sensor and a second sensor, the filter material mud content detection unit represented by turbidity is connected with the second sensor, the first sensor is used for receiving the turbidity information of wastewater in the backwashing wastewater tank collected by the online turbidity detection device, and transmits the turbidity information to a controller of the backwash water pump, thereby controlling the on-off of the backwash water pump. The second sensor is used for receiving the information (namely the mud content) of the cleaning condition of the filter material, which is represented by the turbidity and detected by the filter material mud content detection unit, and transmitting the information of the mud content of the filter material, which is represented by the turbidity, to the controllers of the backwashing water pump and the air pump, so that the time length of the next backwashing operation is controlled. Specifically, the turbidity of the backwash wastewater is detected by the online turbidity detection device 3. The first sensor measures and obtains a corresponding numerical value signal (turbidity) of the backwashing wastewater, the numerical value signal is displayed on a display panel of a controller of the backwashing water pump, and a turbidity critical value of the backwashing wastewater is set in the controller by standard operation according to actual engineering requirements. When the turbidity of the backwashing wastewater actually measured is reduced to a set turbidity critical value and the mud content of the filter material meets the requirement, the relay equipment in the backwashing water pump controller can be powered on to act, and a switching value signal for closing the backwashing water pump is transmitted out. The controller of the backwashing water pump receives the relay action which is carried out when the turbidity and the mud content of the filter material expressed by the turbidity reach a set value, when the controller of the backwashing water pump receives the switching value signals of the two sensors, the controller of the backwashing water pump reaches a stop condition, the water pump motor acts, and the backwashing water pump stops running, so that the purposes of saving energy and reducing consumption are achieved.
In the actual operation process, because the actual backwashing time accounts for a small percentage in the operation time of the filter, the online turbidity detection device can be arranged in the total backwashing wastewater tank of the whole filter group, so that the backwashing condition of the whole filter group can be monitored, and simultaneously, a single filter tank which is backwashing can be independently monitored in a one-to-many connection mode, in addition, the backwashing time of each filter tank is usually not longer than 20 minutes, so that the purposes of saving energy and reducing consumption are achieved, and the cost is saved.
Finally, it should be noted that: the present invention is not described in detail in the prior art, and the above embodiments are only used to illustrate the technical solution of the present invention, but not to limit the same; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (5)
1. A method for controlling the backwashing duration of a filter tank is characterized in that the filter tank is a gas/water combined backwashing filter tank; the method for controlling the backwashing duration of the filter tank comprises the following steps:
1) an online turbidity detection device is arranged at a backwashing wastewater tank of the filter; setting a turbidity critical value of the backwashing wastewater according to the use scene of the filter;
2) filtering the filter material in the filter tank according to a set time length t 1; after filtering, performing air blasting on the filter until reaching an air blasting time length t2 set according to a use scene; flushing the filter tank with water, performing turbidity detection on wastewater in a backwashing wastewater tank by using the online turbidity detection device until the turbidity of the wastewater is lower than the turbidity critical value of the backwashing wastewater set in the step 1), recording the water washing time t3 after the air flush is finished, and stopping backwashing;
3) continuously repeating the operation of the step 2) until the set time T is reached, and executing the step 4);
4) detecting the mud content of the filter material in the filter tank by using turbidity, and if the mud content of the filter material expressed by turbidity is too low, reducing the time length of the next backwashing, and returning to the step 2); if the mud content of the filter material represented by the turbidity is too high, increasing the time length of the next backwashing, and returning to the step 2); if the mud content of the filter material represented by the turbidity meets the set requirement, setting the next backwashing time length to be equal to the current backwashing time length, namely setting the next backwashing time length to be t2+ t3, and returning to the step 2);
the relationship between the filter material mud content and the next backwashing time length expressed by the turbidity is shown in the following table:
。
2. The method for controlling the duration of filter backwashing according to claim 1, wherein the step 4) is performed at a frequency of 1 month to 1 quarter.
3. The method for controlling the backwashing time length of the filter tank according to claim 1, wherein in the step 4), the concrete steps of detecting the sludge content of the filter material expressed by turbidity are as follows:
taking a filter material sample from the filter tank and placing the filter material sample into a sampling bag, and shaking the sampling bag to ensure that the filter material sample is fully mixed; taking a plurality of filter material samples from the sampling bag and fully mixing the filter material samples with tap water with equal volume; pouring the mixed turbid water into a container; repeating the steps for a plurality of times; and (3) stirring and uniformly mixing the turbid water in the container, obtaining a turbidity measurement value by using a turbidity meter, multiplying the turbidity value by two to obtain a turbidity value of the filter material sample, and recording the turbidity value.
4. The system for controlling the backwashing time length of the filter tank according to claim 1, which comprises an online turbidity detection device, a filter material mud content detection unit expressed by turbidity, a first sensor, a second sensor, a backwashing water pump and a backwashing air pump, wherein the online turbidity detection device is arranged in a backwashing wastewater tank of the filter tank, the filter material mud content detection unit expressed by turbidity is used for judging the mud content of the filter material in the filter tank, the online turbidity detection device is connected with the first sensor and the second sensor, the filter material mud content detection unit expressed by turbidity is connected with the second sensor, and each sensor is connected with a controller of the backwashing water pump; the first sensor is used for receiving the turbidity information of the wastewater in the backwashing wastewater tank collected by the online turbidity detection device and transmitting the turbidity information to the controller of the backwashing water pump so as to control the switch of the backwashing water pump; the second sensor is used for receiving the information of the sludge content of the filter material detected by the turbidity-expressed filter material sludge content detection unit, and transmitting the information of the sludge content of the filter material expressed by turbidity to the controller of the backwashing water pump and the controller of the backwashing air pump, so that the backwashing water pump and the backwashing air pump are controlled to be switched on and off.
5. The system of claim 4, wherein the multi-cell filter pool shares one online turbidity detection device.
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Cited By (5)
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|---|---|---|---|---|
| CN112915641A (en) * | 2021-03-18 | 2021-06-08 | 上海威派格智慧水务股份有限公司 | Filter tank backwashing control method |
| CN113266178A (en) * | 2021-06-23 | 2021-08-17 | 广东纽恩泰新能源科技发展有限公司 | Swimming pool purification system and control method thereof |
| CN114225486A (en) * | 2021-12-08 | 2022-03-25 | 中国电建集团华东勘测设计研究院有限公司 | Backwashing control system suitable for water supply plant filter tank |
| CN115317968A (en) * | 2022-09-14 | 2022-11-11 | 西安热工研究院有限公司 | Automatic cleaning monitoring system based on air scrubbing filter tank |
| CN115364536A (en) * | 2022-09-14 | 2022-11-22 | 北控水务(中国)投资有限公司 | Filter chamber backwashing system, filter chamber system and backwashing method |
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