CN113893698B - Biological pollution control device and control method suitable for drinking water treatment - Google Patents
Biological pollution control device and control method suitable for drinking water treatment Download PDFInfo
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- CN113893698B CN113893698B CN202111506558.3A CN202111506558A CN113893698B CN 113893698 B CN113893698 B CN 113893698B CN 202111506558 A CN202111506558 A CN 202111506558A CN 113893698 B CN113893698 B CN 113893698B
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Images
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D65/00—Accessories or auxiliary operations, in general, for separation processes or apparatus using semi-permeable membranes
- B01D65/02—Membrane cleaning or sterilisation ; Membrane regeneration
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D65/00—Accessories or auxiliary operations, in general, for separation processes or apparatus using semi-permeable membranes
- B01D65/02—Membrane cleaning or sterilisation ; Membrane regeneration
- B01D65/022—Membrane sterilisation
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
- C02F1/442—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by nanofiltration
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2321/00—Details relating to membrane cleaning, regeneration, sterilization or to the prevention of fouling
- B01D2321/16—Use of chemical agents
- B01D2321/168—Use of other chemical agents
Abstract
The disclosure relates to a biological pollution control device and a control method suitable for drinking water treatment, wherein the control device comprises a filtering device, a dosing device and a cleaning device; the filter device is internally provided with a filter membrane, a first water inlet and a first water outlet which are communicated with an external water source, and is used for filtering water entering from the first water inlet to form supply drinking water; the chemical adding device comprises a chemical adding module for storing an anticorrosive liquid, a water inlet and a chemical outlet, the chemical outlet is communicated with the first water inlet, and the anticorrosive liquid enters the filtering device from the first water inlet to sterilize the filtering membrane; the cleaning device is provided with a second water outlet communicated with the first water inlet and a second water inlet communicated with the first water outlet, the cleaning device is used for enabling water flowing out of the first water outlet to enter the filtering device through the second water outlet so as to circularly wash the filtering membrane and reduce the residue of the bactericide, the dosing device plays a role in sterilizing the filtering device, and the preservative solution is higher in safety as the bactericide.
Description
Technical Field
The disclosure relates to the technical field of drinking water filtration and treatment, in particular to a biological pollution control device and a biological pollution control method suitable for drinking water treatment.
Background
With the increasingly strict requirements on the quality of drinking water, the nanofiltration membrane technology is increasingly used for treating the drinking water at present, and compared with the existing ultrafiltration membrane or ozone-biological activated carbon treatment process, the nanofiltration membrane technology has lower molecular weight which can intercept small molecular organic pollutants, so that small molecular organic pollutants can be removed more effectively, and certain mineral substances such as monovalent salts such as sodium ions, potassium ions and the like are retained, thereby being beneficial to health. The filtering device with the nanofiltration membrane is arranged on a flow path of a treated water source, and supplied drinking water meeting the water quality requirement of the drinking water is obtained at the downstream of the filtering device.
However, the nanofiltration membrane is accompanied by the problem of bacterial growth in the using process, and under the condition of microbial pollution, the membrane flux and interception capability are reduced, and the membrane element can be damaged in serious cases, so that the water quality of water supply is affected, and the microbial indexes of produced water and the like can not meet the water quality requirements.
Disclosure of Invention
To solve the above technical problems or at least partially solve the above technical problems, the present disclosure provides a water treatment process pollutant purification system and purification method.
In a first aspect, the present disclosure provides a biological pollution control device suitable for drinking water treatment, comprising a filtering device, a dosing device, and a cleaning device;
the filtering device is internally provided with a filtering membrane and is provided with a first water inlet and a first water outlet, the first water inlet is communicated with an external water source, and the filtering device is used for filtering water entering from the first water inlet to form supply drinking water;
the dosing device comprises a dosing module, preservative solution for sterilization is stored in the dosing module, the dosing module is provided with a water inlet and a medicine outlet, and the medicine outlet is communicated with the first water inlet so that the preservative solution enters the filtering device from the first water inlet to sterilize and purify the filter membrane;
the cleaning device is provided with a second water outlet communicated with the first water inlet and a second water inlet communicated with the first water outlet, and the cleaning device is used for enabling water flowing out of the first water outlet to enter the filtering device through the second water outlet so as to circularly flush the filtering membrane.
Optionally, charge device still includes pH valve adjusting module, the storage is adjusted to pH valve in the module is used for right the regulator solution that pH valve was adjusted is carried out to the antiseptic solution, pH valve adjusting module has the liquid outlet, the liquid outlet with go out the medicine mouth intercommunication, so that the regulator solution with the antiseptic solution mixes.
Optionally, the medicine adding module comprises a bactericide medicine box, a medicine adding pump and a liquid level sensing device, the medicine adding pump is located at a liquid outlet of the bactericide medicine box, a sensing unit of the liquid level sensing device is arranged inside the bactericide medicine box, and the liquid level sensing device is electrically connected to the medicine adding pump, so that when the liquid level in the bactericide medicine box reaches a set value, the liquid level sensing device receives a signal of the sensing unit and starts the medicine adding pump.
Optionally, the water inlet is communicated with the first water outlet, so that water discharged from the first water outlet enters the dosing module and is mixed with the preservative in the dosing module to form the preservative solution.
Optionally, the filtering apparatus includes a pretreatment module and a nanofiltration module, a water inlet of the pretreatment module is the first water inlet, the pretreatment module is configured to enable the external water source to form primary drinking water after passing through the pretreatment module, a water outlet of the pretreatment module is communicated with a water inlet of the nanofiltration module, a water outlet of the nanofiltration module is the first water outlet, and the nanofiltration module is configured to enable the primary drinking water to form drinking water after passing through the nanofiltration module.
Optionally, the second water outlet includes a first cleaning outlet and a second cleaning outlet, and the first cleaning outlet is communicated with the water inlet of the pretreatment module; the second cleaning outlet is communicated with the water inlet of the nanofiltration module.
Optionally, the cleaning device includes a cleaning water tank, a filtering module and a cleaning water pump, the water outlet of the cleaning water tank forms the second water outlet, and the filtering module and the cleaning water pump are disposed at the position of the second water outlet.
Optionally, the cleaning device further comprises a ph value detection module, wherein the ph value detection module is arranged at a water outlet of the cleaning water tank and used for detecting the ph value of the cleaning water in the cleaning water tank.
In a second aspect, the present disclosure also provides a method for purifying pollutants in a water treatment process by using the above system for purifying pollutants in a water treatment process, which comprises the following steps:
injecting the preservative solution in the dosing module into the filtering device from a first water inlet of the filtering device so as to soak a filter membrane in the filtering device in the preservative solution;
introducing cleaning water in the cleaning device into the filtering device from the second water outlet so as to flush a filter membrane in the filtering device, wherein the cleaning water flows out of the first water outlet of the filtering device after passing through the filter membrane and flows back into the cleaning device from the second water inlet so as to circularly flush the filter membrane;
and an external water source is introduced into the filtering device through the first water inlet so as to enable the first water outlet to flow out the supply drinking water.
Optionally, the step of introducing an external water source into the filtering device through the first water inlet so as to make the first water outlet flow out the supply drinking water specifically includes:
taking a water sample at a sampling valve of the filtering device to perform microbial colony detection;
when the number of microbial colonies in the water sample is lower than the set colony number standard, a cleaning water pump of the cleaning device is closed, and the second water outlet is disconnected from the first water inlet;
introducing an external water source into the filtering device so that the external water source continuously washes the filtering device;
the water producing opening of the filtering device is opened so that the external water source produces the supply drinking water after passing through the filtering device.
Compared with the prior art, the technical scheme provided by the disclosure has the following advantages:
the utility model provides a biological pollution controlling means and control method suitable for drinking water treatment connects charge device and belt cleaning device through to the filter equipment who is used for filtering outside water source, charge device's play medicine mouth communicates to filter equipment's water inlet department to put into the anticorrosive liquid that is used for disinfecting in to filter equipment, play the bactericidal effect to filter equipment inner filter membrane, in order to restrain the attached of filter membrane surface microorganism and breed, slow down the dirt of filter membrane and block up, make the supply drinking water after filter equipment filters accord with the quality of water requirement. Simultaneously, belt cleaning device and filter equipment form circulating intercommunication, can also circulate and wash it again after charge device disinfects to filter equipment and purifies, with the reproduction of minimize microorganism, avoid causing the pollution to the drinking water after the filtration, in addition, charge device adopts the germicide of anticorrosive liquid as the filter membrane, for ordinary non-oxidation type germicide, not only can not cause the damage to the filter membrane, still change the acquisition, the security is also higher, when having guaranteed the germicide validity, the quality of water safety of drinking water has still been guaranteed.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present disclosure and together with the description, serve to explain the principles of the disclosure.
In order to more clearly illustrate the embodiments or technical solutions in the prior art of the present disclosure, the drawings used in the description of the embodiments or prior art will be briefly described below, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without inventive exercise.
FIG. 1 is a schematic view of a biological pollution control device suitable for drinking water treatment according to an embodiment of the present disclosure;
FIG. 2 is a schematic view of a filtration apparatus according to an embodiment of the present disclosure;
FIG. 3 is a schematic view of a medicating device according to embodiments of the present disclosure;
FIG. 4 is a schematic view of a cleaning apparatus according to an embodiment of the disclosure;
fig. 5 is a flow chart of a control method of a biological pollution control device suitable for drinking water treatment according to an embodiment of the disclosure.
Wherein, 1, a filtering device; 1a, a pretreatment module; 1b, a nanofiltration module; 10a, a first water inlet; 10b, a first water outlet; 11. branching concentrated water; 11a, a concentrated water valve; 12. producing water branches; 12a, a water production valve; 13. branching waste water; 13a, a waste water valve; 14. a cartridge filter; 15. a multi-section nanofiltration filtration unit; 16. a differential pressure monitoring device; 17. a water inlet pump; 2. a dosing device; 21. a dosing module; 21a, a water inlet; 21b, a medicine outlet; 211. a bactericide box; 212. a stirrer; 22. a pH value adjusting module; 221. adjusting the pH value of a medicine chest; 23. a dosing valve; 24. a dosing pump; 25. a pressure gauge; 3. a cleaning device; 30a and a second water inlet; 30b and a second water outlet; 31. cleaning the water tank; 32. a filtration module; 33. cleaning the water pump; 34. an evacuation valve; 35. a pH value detection module; 4. a liquid level sensing device; 5. a high pressure pump; 6. a water return valve; 100. an external water source.
Detailed Description
In order that the above objects, features and advantages of the present disclosure may be more clearly understood, aspects of the present disclosure will be further described below. It should be noted that the embodiments and features of the embodiments of the present disclosure may be combined with each other without conflict.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present disclosure, but the present disclosure may be practiced in other ways than those described herein; it is to be understood that the embodiments disclosed in the specification are only a few embodiments of the present disclosure, and not all embodiments.
At present, compared with the original ozone-biological activated carbon advanced treatment combined process, the nanofiltration membrane technology has similar construction cost with the ozone-biological activated carbon process, but has lower molecular weight cut-off, can effectively remove small-molecular organic pollutants, simultaneously retains certain mineral substances such as monovalent salts such as sodium ions, potassium ions and the like, is more beneficial to health, and is more and more widely applied to drinking water treatment.
However, the nanofiltration membrane is accompanied by the problem of bacterial growth in the using process, and under the condition of microbial pollution, the membrane flux and the interception capability are reduced, so that the overall recovery rate and the desalination rate of the filtration system are reduced, the membrane element is damaged in serious conditions, the water quality of the supplied water is affected, the microbial indexes of the produced water and the like cannot meet the water quality requirements, and meanwhile, the operation indexes of the water yield, the desalination rate and the like are difficult to realize.
In order to effectively remove the membrane fouling, the cleaning frequency needs to be increased, which greatly affects the operation level of the system, and the currently used bactericide is a non-oxidizing bactericide which has certain toxicity, and a large amount of washing needs to be performed to reduce the content of the bactericide remained in the drinking water filtered by the filtering device as much as possible, so that the cost of filtering and purifying is increased, and the residual degree of the bactericide after washing is difficult to ensure. Therefore, a treatment device which is suitable for drinking water treatment and can effectively solve the problems of bacterial breeding and microbial pollution of a nanofiltration system is needed.
According to the water treatment process pollutant purification system and the water treatment process pollutant purification method, the preservative is used as the bactericide of the nanofiltration system, the system has higher safety compared with the common non-oxidation bactericide, and meanwhile, the circulating type washing mode is adopted, so that the system operation efficiency and the water supply safety are ensured.
As shown in fig. 1-4, the present embodiment provides a biological pollution control device and a control method suitable for drinking water treatment, wherein the control device comprises a filtering device 1, a dosing device 2 and a cleaning device 3.
Wherein, the filtering device 1 has a filtering membrane therein, which has a first water inlet 10a communicated with an external water source 100, and a first water outlet 10b for draining water after filtering. After the first water inlet 10a of the filtering device 1 is communicated with an external water source 100, a filter membrane arranged in the filtering device 1 filters water flowing into the filtering device 1 through the first water inlet 10a, a concentrated water branch 11, a water producing branch 12 and a waste water branch 13 are arranged at the downstream of the first water outlet 10b, and the water producing branch 12 is used for providing supply drinking water which is filtered by the filter membrane and meets the water quality requirement of the drinking water; the concentrated water branch 11 is used for outputting discharge water containing impurities such as part of ion antibiotics and the like intercepted by the filter membrane; the waste water branch 13 is used for collecting waste water which does not meet the requirement of water for reference after filtration but can be recycled for other applications.
Also, the filtering apparatuses 1 generally used are all multi-stage filtration, and therefore, a combination of the pretreatment module 1a and the nanofiltration module 1b is provided in the present embodiment.
The water inlet of the pretreatment module 1a forms a first water inlet 10a, and the pretreatment module 1a is used for enabling an external water source 100 to form primary produced water after passing through the pretreatment module 1 a. The pre-treatment module 1a has a cartridge filter 14, the cartridge filter 14 is provided with a filter element for performing primary filtration in the pre-treatment unit, and a flushable filter element, a micro-filtration type or a combined filter element can be used.
The nanofiltration module 1b is used for making the primary drinking water form the supply drinking water after passing through the nanofiltration module 1b, a water inlet of the nanofiltration module 1b is communicated with a water outlet of the pretreatment module 1a, the nanofiltration module 1b comprises an integrated multi-section nanofiltration filtration unit 15, a nanofiltration membrane is arranged in the nanofiltration module, and other auxiliary devices necessary for maintaining the normal operation of the nanofiltration module 1b are arranged in the nanofiltration module. The nanofiltration membrane is used for filtering the primary drinking water treated by the pretreatment module 1a again so as to obtain supply water meeting the water quality requirement of the drinking water, and therefore, the water outlet of the nanofiltration module 1b is the first water outlet 10b of the filtering device 1.
The biological pollution controlling means suitable for drinking water treatment that this embodiment provided still is provided with charge device 2 on filter equipment 1's basis, and charge device 2 includes medicine module 21, is stored with the anticorrosive liquid that is used for disinfecting in the medicine module 21, and medicine module 21 has water inlet 21a and a medicine outlet 21b, and medicine outlet 21b communicates with first water inlet 10a to make anticorrosive liquid enter into filter equipment 1 by first water inlet 10a, disinfect the purification to the filter membrane. The medicine adding device 2 comprises a medicine adding valve 23 and a medicine adding pump 24, and an operator adjusts the medicine adding amount by controlling the medicine adding valve 23 and the medicine adding pump 24. The downstream outlet of the pressure gauge forms a medicine outlet 21b of the medicine adding module 21.
The preservative solution for sterilization can be selected according to the types of microorganisms on the surfaces of pipelines and membranes, and a proper preservative which does not damage the filter membrane needs to be selected as a bactericide, so that the water quality safety of drinking water is ensured. The preservative such as potassium sorbate or sodium benzoate which is easy to obtain and high in safety can be selected, when the interior of the filtering system has more mould, yeast and aerobic bacteria, the potassium sorbate is used, and the sodium benzoate is more broad-spectrum.
This water treatment process pollutant clean system still has belt cleaning device 3, belt cleaning device 3 has second water inlet 30a and second delivery port 30b, second water inlet 30a and the first water inlet 10a intercommunication of filter equipment 1, second delivery port 30b and the first delivery port 10b intercommunication of filter equipment 1, that is to say, belt cleaning device 3 can form circulation system with filter equipment 1, make the water that flows out through the first delivery port 10b of filter equipment 1 flow into belt cleaning device 3, then flow back to filter equipment 1 in through the second delivery port 30b of belt cleaning device 3 again to play the effect that the circulation was washed to filter equipment 1's filter membrane.
In a specific implementation, as shown in fig. 5, the biological pollution control device suitable for drinking water treatment adopts the following control methods:
step 101: injecting the preservative solution in the dosing module 21 into the filtering device 1 from the first water inlet 10a of the filtering device 1, so that the filter membrane in the filtering device 1 is soaked in the preservative solution;
step 102: introducing cleaning water in the cleaning device 3 into the filtering device 1 from the second water outlet 30b to flush the filter membrane in the filtering device 1, wherein the cleaning water flows out from the first water outlet 10b of the filtering device 1 after passing through the filter membrane and flows back into the cleaning device 3 from the second water inlet 30a to circularly flush the filter membrane;
step 103: the filter apparatus 1 is flushed with the produced water obtained at the produced water outlet 12.
It can be seen that, the biological pollution control device and the control method suitable for drinking water treatment provided by this embodiment put the preservative solution for sterilization into the filtering device 1 by connecting the dosing device 2 to the filtering device 1 for filtering the external water source 100, so as to achieve the sterilization effect on the filter membrane in the filtering device 1, suppress the adhesion and breeding of microorganisms on the surface of the filter membrane, slow down the pollution and blockage of the filter membrane, and make the drinking water supply after being filtered by the filtering device 1 meet the water quality requirement. Simultaneously, increase belt cleaning device 3 and filter equipment 1 and connect, can also circulate and wash filter equipment 1 again after disinfecting to filter equipment 1 and purifying, with the residue of minimize germicide, avoid causing the pollution to the drinking water after the filtration, in addition, charge device 2 adopts the germicide of anticorrosive liquid as the filter membrane, for ordinary non-oxidation type germicide, not only can not cause the damage to the filter membrane, still change the acquisition, the security is also higher, when having guaranteed the germicide validity, the quality of water safety of drinking water has still been guaranteed.
In step 103, the time for flushing the filtering apparatus 1 can be flexibly adjusted according to the requirement, for example, the filtering apparatus 120s is flushed in this embodiment.
After step 103, a step 104 of opening the drain port 34 and draining the water after washing in the washing apparatus 3 through the drain port 34 for the next washing may be provided.
In order to facilitate operators to know whether the filtering device 1 reaches a state needing sterilization and purification, a differential pressure monitoring device 16 can be further arranged in the water treatment process pollutant purification system, and the differential pressure monitoring device 16 comprises a control unit and two pressure monitoring units which are arranged in pairs; the two pressure monitoring units are respectively arranged on the pretreatment module 1a and the nanofiltration module 1b, simultaneously monitor the flow rate of the pretreatment module and output alarm signals when the pressure difference and the flow rate reach set values.
In this embodiment, the pressure monitoring device may be set up in a set of before and after the filter of the pretreatment module 1a, and may also be set up in a set of before and after the filter membrane of the nanofiltration module 1b, so as to conveniently monitor the usage status of the front and rear two-stage filtration systems, and facilitate the subsequent targeted sterilization and purification.
Wherein, medicine module 21 of charge device 2 further includes germicide medical kit 211, add medicine pump 24 and liquid level induction system 4, the anticorrosive liquid that is used for disinfecting is stored in germicide medical kit 211, it is located the liquid outlet of germicide medical kit 211 to add medicine pump 24, liquid level induction system 4's induction element sets up the inside at germicide medical kit 211, liquid level induction system 4 electricity is connected in adding medicine pump 24, so that when the liquid level in germicide medical kit 211 reaches the setting value, liquid level induction system 4 receives induction element's signal and opens adding medicine pump 24.
The dosing module 21 can realize the communication control between the liquid level sensing device 4 and the dosing pump 24 and the dosing valve 23 by separately arranging the branched control modules, and can also control the general operation end by the overall control system of the purification system.
In addition, the dosing pump 24 and the dosing valve 23 on the dosing module 21 are used in pairs, the on-off of the dosing valve 23 is controlled, and the flow rate of the dosing pump 24 is controlled. Meanwhile, a pressure gauge 25 is further arranged on a pipeline communicated with the dosing module 21 and the filtering device 1, and the pressure gauge 25 facilitates operators to monitor the hydraulic pressure on a flow path of the dosing module 21 in real time. In addition, the bactericide medicine box 211 is also provided with a stirrer 212, and the bactericide is prepared by dissolving the preservative in water, so that the stirrer 212 can dissolve and uniformly distribute the bactericide more quickly.
The set value of the preservative solution can be determined according to the proportion of the bactericide, and the concentration of the bactericide solution is usually in the range of 20-30%. When the antiseptic solution is disposed in the antiseptic agent box 211, the antiseptic agent raw material in a solid state is poured into the antiseptic agent box 211, water is added and the mixture is uniformly stirred, and after the disposition is completed, the antiseptic agent adding valve 23 and the antiseptic agent adding pump 24 are opened, and the antiseptic solution is injected into the filtering device 1. When the device is put into operation, the concentration of the preservative solution in the filtering device 1 needs to be controlled within the range of 1% -5%, the sterilization effect is achieved, and meanwhile, large residue caused by overlarge concentration cannot occur in the later period.
The medicine adding unit comprises a medicine adding module 21 and a pH value adjusting module 22, wherein a regulating solution used for regulating the pH value of the preservative solution is stored in the pH value adjusting module 22, the pH value adjusting module 22 is provided with a liquid outlet, and the liquid outlet is communicated with a medicine outlet 21b of the medicine adding module 21 so as to mix the regulating solution and the preservative solution. The pH value adjusting module 22 is mainly used for adjusting the pH value of the preservative solution during use so as to ensure the sterilization effect of the preservative solution. Optionally, the antiseptic in the preservative solution is not potassium sorbate or sodium benzoate.
The ph adjusting module 22 further includes a ph adjusting medicine box 221, a medicine adding valve 23, a medicine adding pump 24 and a pressure gauge 25, which are connected in sequence, and similarly, a liquid level sensing device 4 can be also arranged in the ph adjusting module 22, a liquid level meter of the liquid level sensing device 4 is located inside the ph adjusting medicine box 221 and is associated with the medicine adding pump 24, when a preservative solution in the ph adjusting medicine box 221 is lower than a set value, the liquid level sensing device 4 can output a reminding signal to remind an operator to supplement a configured bactericide solution, and the medicine adding unit is controlled to stop adding medicine into the filtering device 1 through connection with the medicine adding pump 24. Like the control method of the dosing module 21 mentioned above, any existing control method can be adopted for the ph adjusting module 22 as long as the intelligent dosing effect can be achieved.
In order to facilitate the practical operation of personnel, the advantage of the purification and circulation system can be utilized to communicate the water inlet 21a of the dosing module 21 with the first water outlet 10b of the filtering device 1, so that the water discharged from the first water outlet 10b enters the dosing module 21 and is mixed with the preservative in the dosing module 21 to form the preservative solution, and the pH value adjusting module 22 is similar to the preservative solution. Therefore, water produced by the filtering device 1 can be directly used for diluting the preservative, so that the trouble of manually adding water by operators is avoided, and the operability of the whole system is stronger.
For the cleaning device 3 of the biological pollution control device suitable for drinking water treatment, since the filtering device 1 comprises the pretreatment module 1a and the nanofiltration module 1b, in order to purify the pretreatment module 1a and the nanofiltration module 1b in a targeted manner, the second water outlet 30b of the cleaning device 3 is arranged to comprise a first cleaning outlet and a second cleaning outlet, and the first cleaning outlet is communicated with the water inlet of the pretreatment module 1 a; the second cleaning outlet is communicated with the water inlet of the nanofiltration module 1 b. A pipe may be directly provided behind the pre-treatment module 1a to communicate to the second water inlet 30a of the cleaning device, thereby achieving the effect of being able to purify only the pre-treatment unit.
Further, the washing device 3 includes a washing water tank 31, a filter module 32, and a washing water pump 33, an outlet of the washing water tank 31 forms a second outlet 30b, and the filter module 32 and the washing water pump 33 are provided at a position of the second outlet 30 b. Wash water tank 31 and be used for storing the washing water, the water inlet of washing water tank 31 can communicate to the delivery port of filter module 32 to realize under normal operating condition, accessible filter equipment 1 is to the moisturizing in the washing water tank 31, and washing water tank 31 still can set up evacuation valve 34 in addition, so that the evacuation washs ponding in the water tank 31 or carries out the change of water in the water tank. The filtering module 32 is used for filtering the impurities deposited in the cleaning water tank 31 to prevent the impurities from flowing into the filtering device 1 again to affect the filtering effect.
In addition, also can set up liquid level induction system 4 in wasing water tank 31, liquid level induction system 4 and washing water pump 33 electricity are connected to when realizing that the water level is less than the setting value in wasing water tank 31, washing water pump 33 stops, and induction system sends cue signal, and how to realize specifically that the induction process can refer to the setting mode of liquid level induction system 4 in medicine module 21.
The medicine outlet 21b of the medicine adding module 21 can be directly communicated with the first water inlet 10a of the filtering device 1, namely directly communicated with the pretreatment module 1a or the nanofiltration module 1b, and also can be communicated with the second water outlet 30b of the cleaning device 3, the effect of putting in the filtering device 1 can be achieved, and in the medicine is directly added into the cleaning device 3, the large-flow washing can be achieved through the cleaning device 3.
When the operation is started, the water inlet pump 17 of the filtering device 1 is opened, and the concentrated water valve 11a and the waste water valve 13a of the filtering device 1 are both opened so as to perform low-pressure flushing on the filtering device 1. And then, in a filtering stage, an external water source 100 enters the water inlet pump 17, is filtered by the security filter 14 of the pretreatment module 1a, and then flows into the nanofiltration module 1b under pressure by the high-pressure pump 5, only the concentrate valve 11a and the water production valve 12a are left to be opened at the moment, supplied drinking water meeting the requirement is discharged from the water production valve 12a, concentrated water generated by filtering is discharged from the concentrate valve 11a, and unqualified produced water is discharged from the waste water valve 13 a.
After the system is used for a period of time, in the normal operation process, in order to prevent microorganisms from attaching to the filter membrane to breed and gradually accumulate to inhibit the microorganisms from forming biological mucous membrane, the preservative solution can be intermittently added to the filtering device 1 through the dosing device 2 to be used as a bactericide to sterilize and purify so as to slow down the pollution and blockage of the filter element and the filter membrane.
The intermittent feeding mode can realize the linkage effect of the pressure detection unit in the filtering device 1 and the dosing device 2 through the control system of the control device. During the concrete realization, when the pressure detection unit detects that pressure differential risees to the setting value, then trigger charge device 2 and filter equipment 1's intercommunication through controlling means, charge device 2's charge pump 24 opens promptly, opens pH valve adjusting module 22 simultaneously, guarantees the pH valve of the service environment of anticorrosive liquid, simultaneously, triggers the intercommunication of belt cleaning device 3 and filter equipment 1 through controlling means, and belt cleaning device 3's washing water pump 33 opens promptly.
The adding amount of the preservative solution and the maintenance state of the pH value in the whole purification system can be set and adjusted according to specific use conditions, in the embodiment, 500ppm is added, and the pH value is controlled within the range of 4-6. In addition, when the filter device 1 is soaked, the soaking time is kept at 30min, and the soaking time can be flexibly adjusted according to actual conditions.
And (3) opening a water return valve 6 between the filtering device 1 and the cleaning device 3, closing a water inlet valve of the nanofiltration device, circularly washing the pretreatment module 1a, and discharging the wastewater generated after washing through a wastewater valve 13a and an emptying valve 34 of the cleaning water tank 31. The cartridge filter 14 may be cleaned by aeration during sterilization and purification with the preservative solution. After 1-4 cycles of flushing, the flushing process is finished, the water inlet pump 17 is started again for water inlet, and the outlet water of the first 30s is discharged through the waste water valve 13a and is not used as drinking water for treatment.
In the specific implementation, the degrees of colony propagation are relatively different in different seasons, and when the water temperature is high, the metabolism of microorganisms is vigorous, and the adding frequency or adding amount of the bactericide needs to be increased, so that the preservative solution is initially added every two weeks when the water temperature is lower than 15 ℃; when the water temperature is higher than 15 ℃, the adding is carried out for 1-3 times per week, and the adding lasts for 30min each time.
On the basis, a sampling valve can be arranged at the water outlet of the filtering device 1, namely the water outlet pipeline close to the cartridge filter 14 and the water outlet pipeline close to the nanofiltration membrane, so as to extract the drinking water filtered by the filtering device 1 for microbial colony detection. If the microbial colony exceeding the standard is detected in a state where sterilization and purification are not performed, the filter module 32 may be sterilized and cleaned in a targeted manner, and conversely, if the microbial colony is detected to be lower than a set value in a state where sterilization and purification are performed, the cleaning apparatus 3 may be shut down.
In this embodiment, reach the colony number of wasing the standard and need be less than 100, to the nanofiltration membrane, can set up the standard higher, and the colony number needs be less than 50 promptly, of course, to the user state of difference, this standard can be adjusted.
It should be noted that, in the process of adding the preservative solution for sterilization, the concentration of the preservative solution at the water outlet end of the filtering device 1 should be detected, so as to ensure that the preservative solution cannot enter the water production end through the membrane during operation.
By the control device and the control method provided by the embodiment, pollutants in the container wall and the filter element in the pretreatment module 1a can be obviously removed, and the filtering performance returns to 90% of the initial state; the flux of the nanofiltration membrane in the nanofiltration module 1b can be recovered to 60% of the original state, and the overall flux can be recovered to nearly 100% by matching with the cleaning of other conventional chemical agents in a daily state.
It is noted that, in this document, relational terms such as "first" and "second," and the like, may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The foregoing are merely exemplary embodiments of the present disclosure, which enable those skilled in the art to understand or practice the present disclosure. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the disclosure. Thus, the present disclosure is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (8)
1. A biological pollution control device suitable for drinking water treatment is characterized by comprising a filtering device (1), a dosing device (2) and a cleaning device (3);
the filtering device (1) is internally provided with a filtering membrane, the filtering device (1) is provided with a first water inlet (10 a) and a first water outlet (10 b), the first water inlet (10 a) is used for being communicated with an external water source (100), and the filtering device is used for filtering water entering from the first water inlet (10 a) to form supply drinking water;
the filtering device (1) comprises a pretreatment module (1 a) and a nanofiltration module (1 b), wherein a water inlet of the pretreatment module (1 a) is the first water inlet (10 a), the pretreatment module (1 a) is used for enabling the external water source (100) to form primary drinking water after passing through the pretreatment module (1 a), a water outlet of the pretreatment module (1 a) is communicated with a water inlet of the nanofiltration module (1 b), a water outlet of the nanofiltration module (1 b) is the first water outlet (10 b), and the nanofiltration module (1 b) is used for enabling the primary drinking water to form supply drinking water after passing through the nanofiltration module (1 b);
the medicine adding device (2) comprises a medicine adding module (21), antiseptic solution for sterilization is stored in the medicine adding module (21), the medicine adding module (21) is provided with a water inlet (21 a) and a medicine outlet (21 b), and the medicine outlet (21 b) is communicated with the first water inlet (10 a) so that the antiseptic solution enters the filtering device (1) from the first water inlet (10 a) to sterilize and purify the filtering membrane;
the cleaning device (3) is provided with a second water outlet (30 b) communicated with the first water inlet (10 a) and a second water inlet (30 a) communicated with the first water outlet (10 b), and the cleaning device (3) is used for enabling water flowing out of the first water outlet (10 b) to enter the filtering device (1) through the second water outlet (30 b) so as to circularly flush the filtering membrane;
the cleaning device (3) comprises a cleaning water tank (31), a filtering module (32) and a cleaning water pump (33), wherein a water outlet of the cleaning water tank (31) forms the second water outlet (30 b), and the filtering module (32) and the cleaning water pump (33) are arranged at the position of the second water outlet (30 b).
2. The biological pollution control device suitable for drinking water treatment according to claim 1, wherein the chemical adding device (2) further comprises a pH value adjusting module (22), the pH value adjusting module (22) stores a regulating solution for adjusting the pH value of the corrosion-resistant solution, and the pH value adjusting module (22) has a liquid outlet which is communicated with the chemical outlet (21 b) to mix the regulating solution and the corrosion-resistant solution.
3. The biological pollution control device suitable for drinking water treatment according to claim 1, wherein the medicine adding module (21) comprises a bactericide medicine box (211), a medicine adding pump (24) and a liquid level sensing device (4), the medicine adding pump (24) is located at a liquid outlet of the bactericide medicine box (211), a sensing unit of the liquid level sensing device (4) is arranged inside the bactericide medicine box (211), and the liquid level sensing device (4) is electrically connected to the medicine adding pump (24), so that when the liquid level in the bactericide medicine box (211) reaches a set value, the liquid level sensing device (4) receives a signal of the sensing unit and turns on the medicine adding pump (24).
4. The biological pollution control device suitable for drinking water treatment according to claim 1, wherein the water inlet (21 a) is communicated with the first water outlet (10 b) so that water discharged from the first water outlet (10 b) enters the medicated module (21) to be mixed with the preservative inside the medicated module (21) to form the preservative solution.
5. The biological pollution control device suitable for drinking water treatment according to claim 1, wherein said second water outlet (30 b) comprises a first washing outlet and a second washing outlet, said first washing outlet being in communication with a water inlet of said pretreatment module (1 a); the second cleaning outlet is communicated with the water inlet of the nanofiltration module (1 b).
6. The biological pollution control device suitable for drinking water treatment according to claim 1, wherein the cleaning device (3) further comprises a pH value detection module (35), and the pH value detection module (35) is disposed at the water outlet of the cleaning water tank (31) and is used for detecting the pH value of the cleaning water in the cleaning water tank (31).
7. A control method using the biological pollution control device suitable for drinking water treatment according to any one of claims 1 to 6, wherein the control method comprises the following steps:
injecting the preservative solution in the dosing module into the filtering device from a first water inlet of the filtering device so as to soak a filter membrane in the filtering device in the preservative solution;
introducing cleaning water in the cleaning device into the filtering device from the second water outlet so as to flush a filter membrane in the filtering device, wherein the cleaning water flows out of the first water outlet of the filtering device after passing through the filter membrane and flows back into the cleaning device from the second water inlet so as to circularly flush the filter membrane;
and an external water source is introduced into the filtering device through the first water inlet so as to enable the first water outlet to flow out the supply drinking water.
8. The method according to claim 7, wherein the step of introducing an external water source into the filtering device through the first water inlet to make the first water outlet flow the supplied drinking water comprises:
taking a water sample at a sampling valve of the filtering device to perform microbial colony detection;
when the number of microbial colonies in the water sample is lower than the set colony number standard, a cleaning water pump of the cleaning device is closed, and the second water outlet is disconnected from the first water inlet;
introducing an external water source into the filtering device so that the external water source continuously washes the filtering device;
the water producing opening of the filtering device is opened so that the external water source produces the supply drinking water after passing through the filtering device.
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