CN112919688A - Device and method for transforming town water plant by ultrafiltration - Google Patents
Device and method for transforming town water plant by ultrafiltration Download PDFInfo
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- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
- C02F1/444—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by ultrafiltration or microfiltration
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- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F1/5236—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents
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- C02F1/72—Treatment of water, waste water, or sewage by oxidation
- C02F1/76—Treatment of water, waste water, or sewage by oxidation with halogens or compounds of halogens
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- C02F2209/11—Turbidity
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Abstract
The invention relates to a device and a method for transforming a village and town water plant by using ultrafiltration, which aims at the problems of poor shock resistance, excessive effluent turbidity, poor sensory effect and the like of the traditional treatment process of dosing coagulation-precipitation-filtration-disinfection of the village and town water plant, and utilizes an ultrafiltration system to transform the village and town water plant, selects a novel PVDF ultrafiltration membrane with the aperture of less than or equal to 50nm to carry out deep filtration on the effluent of a sand filter, efficiently removes substances such as suspended matters, iron, manganese metals, algae, microorganisms and the like in a water body, ensures that the turbidity of the ultrafiltration effluent is less than or equal to 0.1 NTU, ensures that the total number of colonies is less than or equal to 10 CFU/mL, meets and exceeds the requirements of GB 5749 and 2006 sanitary Standard for Drinking Water, and effectively ensures the water safety of users in villages and tow.
Description
Technical Field
The invention relates to a device and a method for transforming a village and town water plant by ultrafiltration, belonging to the technical field of water treatment.
Background
China is vast in breadth, and a plurality of small-sized village and town water plants are scattered to provide daily drinking water service for vast villagers and small-town residents. The traditional treatment processes of 'dosing coagulation, precipitation, filtration and disinfection' are mostly adopted in small-sized village and town water plants, surface water such as river water, reservoirs and the like is subjected to conventional treatment, the quality of the surface water source is greatly influenced by seasonal changes, the turbidity of the ordinary river water is lower, the river water becomes turbid in rainy seasons, the amount of silt is increased, algae is increased in summer, the treatment effect of the small-sized village and town water plants is greatly influenced, the turbidity of factory water often exceeds the standard, the sensory effect of water quality is poor, user opinions are large, and the operation of the small-sized village and town water plants is troubled for a long time. Some patents are directed at the improvement of small and medium-sized water plants, such as 201810130191.1 conventional short-flow advanced water treatment systems and methods of small and medium-sized water plants, the traditional processes of dosing coagulation, precipitation, filtration and disinfection are improved into a pretreatment tank, an ozone contact tank, a filter tank and an ultraviolet disinfection chamber, ozone and ultraviolet disinfection processes are added, and a quartz sand filter tank is upgraded in situ into an activated carbon-quartz sand double-layer filter material filter tank, so that the organic pollution water quality in low-pollution water is improved, but the turbidity is not improved much. For example, 201921619659.X is a lifting and reforming system suitable for treating a micro-polluted water source in a water plant, and the water quality of produced water is improved by ultrafiltration and reverse osmosis, so that the overall investment and operating cost are greatly improved. The invention provides a method for modifying a village and town water plant by using a novel PVDF (polyvinylidene fluoride) ultrafiltration membrane with the pore diameter less than or equal to 50nm, so that suspended matters, iron, manganese metals, algae, microorganisms and other substances in a water body are efficiently removed, and the effluent reaches GB 5749 + 2006 sanitary Standard for Drinking Water.
Disclosure of Invention
The invention provides a device and a method for transforming a village and town water plant by ultrafiltration, aiming at solving the problems of poor shock resistance, excessive turbidity of effluent, poor sensory effect and the like of the traditional treatment process of 'dosing coagulation-precipitation-filtration-disinfection' of the village and town water plant, the invention discloses a device and a method for transforming the village and town water plant by ultrafiltration technology, which select a novel PVDF ultrafiltration membrane with the aperture less than or equal to 50nm to carry out deep filtration on the effluent of a sand filter, efficiently remove substances such as suspended matters, iron, manganese metal, algae, microorganisms and the like in a water body, the turbidity of the ultrafiltration effluent is less than or equal to 0.1 NTU, the total number of colonies is less than or equal to 10 CFU/mL, and the main limit value standard that the total number of colonies of the water quality of the domestic drinking water is less than or equal to 100 CFU/mL and the turbidity is less than or equal to 1NTU is met and higher than the standard specified in GB 5749 and 2006 sanitary Standard for domestic Drinking Water; the total number of colonies far higher than the water quality of the small centralized water supply is less than or equal to 500 CFU/mL, and the turbidity is less than or equal to 3 NTU. The ultrafiltration technology is a new generation of green and environment-friendly membrane technology, the ultralow turbidity and the low total number of colonies of the ultrafiltration effluent mean that the water quality indexes of microorganisms, bacteria, organic matters and the like of water quality are low, and the ultrafiltration technology can be used as a main water quality monitoring index for small-sized village and town water plants; the ultrafiltration technology can well filter algae, reduce the addition of disinfectant and also does not need to add a large amount of coagulant, thereby reducing the medicine consumption and the energy consumption of a water plant; the operation and backwashing of the ultrafiltration device are automatically controlled by a PLC (programmable logic controller), so that the influence of human factors is reduced; the ultrafiltration technology is very suitable for upgrading and reconstructing a village and town water plant, and the aim of effectively ensuring the water safety of village and town users is fulfilled.
The technical solution of the invention is as follows: the device for reforming the village and town water plant by using ultrafiltration comprises a traditional water treatment system and an ultrafiltration system, wherein the traditional water treatment system comprises a water taking pump, a coagulation tank, a sedimentation tank, a sand filter tank, a clean water tank, a water supply pump, a backwash pump and a discharge tank, a water outlet of the water taking pump is connected with a water inlet of the coagulation tank, a water outlet of the coagulation tank is connected with a water inlet of the sedimentation tank, a water outlet of the sedimentation tank is connected with a water inlet of the sand filter tank, a disinfectant feeding point is arranged between the sand filter tank and the clean water tank, a first water outlet of the clean water tank is connected with a water inlet of the water supply pump, a second water outlet of the sand filter tank is connected with a water inlet of the backwash pump, a water outlet of the; the ultrafiltration system is arranged between the sand filter and the clean water tank, and after a disinfectant feeding point, the system comprises an intermediate water tank, a self-cleaning filter, an ultrafiltration device, a dosing device and a backwashing water tank, wherein the outlet water of the sand filter is connected to the water inlet of the intermediate water tank, the water outlet of the intermediate water tank is connected with the water inlet of the self-cleaning filter, the water outlet of the self-cleaning filter is connected to the water inlet of the ultrafiltration device, the water outlet of the ultrafiltration device is connected to the water inlet of the backwashing water tank, the No. 1 water outlet of the backwashing water tank is connected to the backwashing water inlet of the ultrafiltration device through an ultrafiltration backwashing pump, the drug outlet of the dosing device is also connected to the backwashing water inlet of the ultrafiltration device, and the No. 2 water outlet of the.
The ultrafiltration system comprises a middle water tank, a booster pump, a self-cleaning filter, an ultrafiltration device, a backwashing fan, a dosing device, an ultrafiltration backwashing pump and a backwashing water tank; wherein the water outlet of the sand filter is connected with the water inlet of the middle water tank, the water outlet of the middle water tank is connected with the water inlet of the self-cleaning filter through a booster pump, and the water outlet of the self-cleaning filter is connected with the water inlet of the ultrafiltration device; the water outlet of the ultrafiltration device is connected to the water inlet of the backwashing water tank, the No. 1 water outlet of the backwashing water tank is connected to the backwashing water inlet of the ultrafiltration device through an ultrafiltration backwashing pump, the medicine outlet of the medicine adding device is also connected to the backwashing water inlet of the ultrafiltration device, and the air outlet of the backwashing fan is connected to the backwashing air inlet of the ultrafiltration device; a cleaning water outlet of the self-cleaning filter and a backwashing water outlet of the ultrafiltration device are sent out of the ultrafiltration system for drainage; the No. 2 water outlet of the backwashing water tank overflows and is sent out of the ultrafiltration system to discharge water;
in the ultrafiltration system, the filtration precision of the self-cleaning filter is 100 mu m, a PVDF ultrafiltration membrane with the aperture less than or equal to 50nm is adopted in the ultrafiltration device, and the dosing device is a sodium hypochlorite dosing device.
The working method of the ultrafiltration system comprises the following steps:
(1) the method comprises the following steps of buffering water discharged from a sand filter by using an intermediate water tank, controlling a booster pump to pressurize according to ultrafiltration flow frequency conversion, adjusting a frequency converter to be 40-55 Hz, and ensuring that ultrafiltration flow is stabilized within +/-5% of a set value Q;
(2) the self-cleaning filter with the filtering precision of 100 mu m is used for filtering the effluent of the sand filter, so as to filter fine sand grains running out of the sand filter, avoid scratching an ultrafiltration membrane and effectively protect ultrafiltration equipment;
(3) PVDF ultrafiltration membranes with the pore diameter of less than or equal to 50nm are used for carrying out deep filtration on suspended matters and bacteria in water, the turbidity of sand-filtered effluent is filtered from 1-5 NTU to less than or equal to 0.1 NTU, the total number of colonies is less than or equal to 10 CFU/mL and is far higher than the requirement of GB 5749 and 2006 sanitary Standard for Drinking Water, and the effluent quality of village and town water plants is greatly improved;
(4) sodium hypochlorite is added through a dosing device, a backwashing fan and a backwashing water pump are used for carrying out automatic air-water combined backwashing on ultrafiltration at regular time, the backwashing time interval is 30-90 minutes, and the backwashing time is 30-60 seconds, so that the long-term stable operation of the ultrafiltration device is maintained.
The method for reforming the device of the town water plant by using ultrafiltration comprises the following steps:
1) performing ultrafiltration modification in a village and town water plant, and inserting an ultrafiltration system by cutting off a pipeline between a water outlet of the sand filter and a water inlet of a clean water tank;
2) filtering the effluent of the sand filter by a self-cleaning filter, wherein the filtering precision is 100 mu m, and protecting an ultrafiltration membrane;
3) the effluent is deeply filtered by an ultrafiltration device, the turbidity of the ultrafiltration effluent is less than or equal to 0.1 NTU, the total number of floras is less than or equal to 10 CFU/mL and exceeds the drinking water quality requirement of GB 5749-;
4) the long-term stable operation of the ultrafiltration device is ensured by carrying out timed air-water combined backwashing on the ultrafiltration.
Step 1) carrying out ultrafiltration modification on the village and town water plant, specifically, cutting off an X point of a pipeline behind a disinfectant adding point between a water outlet of a sand filter tank and a water inlet of a clean water tank, and inserting an ultrafiltration system for advanced treatment; the turbidity of the effluent is changed from 1-5 NTU to less than or equal to 0.1 NTU by using an ultrafiltration system, the total number of colonies is less than or equal to 10 CFU/mL and is far higher than the requirement of GB 5749 plus 2006 sanitary Standard for Drinking Water, and sensory and bacterial indexes of the effluent quality are greatly improved.
And 2) filtering the effluent of the sand filter tank through a self-cleaning filter, specifically, buffering the effluent of the sand filter tank by using an intermediate water tank, controlling the pressurization of a booster pump according to the ultrafiltration flow variable frequency, filtering the effluent of the sand filter tank by using the self-cleaning filter with the filtering precision of 100 mu m, filtering fine sand grains running out of the sand filter tank, avoiding scratching an ultrafiltration membrane, and effectively protecting ultrafiltration equipment.
And 3) performing deep filtration by using an ultrafiltration device, specifically performing deep filtration on suspended matters and bacteria in water by using a PVDF ultrafiltration membrane with the aperture less than or equal to 50nm, and filtering the turbidity of sand-filtered water from 1-5 NTU to a turbidity less than or equal to 0.1 NTU, wherein the total number of colonies is less than or equal to 10 CFU/mL and is far higher than the requirement of GB 5749 and 2006 sanitary Standard for Drinking Water, thereby greatly improving the quality of the effluent of village and town water plants.
And 4) performing air-water combined backwashing on the ultrafiltration at regular time, specifically adding sodium hypochlorite through a dosing device, and performing automatic air-water combined backwashing on the ultrafiltration at regular time by utilizing a backwashing fan and a backwashing water pump, wherein the backwashing time interval is 30-90 minutes, and the backwashing time is 30-60 seconds so as to maintain the long-term stable operation of the ultrafiltration device.
The device and the method for transforming the village and town water plant by using ultrafiltration are used for transforming the village and town water plant by using an ultrafiltration system, aiming at the problems of poor shock resistance, excessive turbidity of effluent, poor sensory effect and the like of the traditional treatment process of dosing coagulation-precipitation-filtration-disinfection of the village and town water plant, and selecting a novel PVDF ultrafiltration membrane with the aperture of less than or equal to 50nm to carry out deep filtration on the effluent of a sand filter, so that suspended matters, iron, manganese metals, algae, microorganisms and the like in a water body are efficiently removed, the turbidity of the ultrafiltration effluent is less than or equal to 0.1 NTU, the total number of colonies is less than or equal to 10 CFU/mL, the requirement of GB 5749 and 2006 sanitary Standard for Drinking Water is met and higher, and the water safety of village and town users is effectively ensured.
Drawings
Fig. 1 is a schematic diagram of an overall reconstruction structure of a device for reconstructing a village and town water plant by using ultrafiltration.
In the drawing, UFS denotes an ultrafiltration system, SFoutDenotes the sand filter effluent, UFoutDenotes the ultrafiltration System effluent, UFeShowing the drainage of the ultrafiltration system, and X showing the cut-off point of the sand filter outlet water to the clean water tank pipeline.
FIG. 2 is a schematic diagram of an ultrafiltration system of a device for reforming a town water plant by ultrafiltration.
In the drawing, UFS denotes an ultrafiltration system, SFoutDenotes the sand filter effluent, UFoutDenotes the ultrafiltration System effluent, UFeRepresents the ultrafiltration system drainage; MT denotes the intermediate tank, P1To representBooster pump, AF for self-cleaning filter, UF for ultrafiltration device, B for backwash fan, DE for dosing device, P2Indicating an ultrafiltration backwash pump and BWT a backwash tank.
Fig. 3 is a flow chart of the overall reforming process of an embodiment of reforming a town water plant using ultrafiltration.
FIG. 4 is a flow chart of an ultrafiltration system for reforming a town water plant by ultrafiltration.
Detailed Description
Referring to the attached figure 1, the device for reforming the village and town water plant by ultrafiltration structurally comprises an original traditional water treatment system of the village and town water plant and a reformed and added ultrafiltration system UFS; the treatment process of the original traditional water treatment system of the village and town water plant is as follows: river water is lifted to a coagulation tank by a water intake pump, coagulant is added for coagulation sedimentation and sand filter filtration, the river water enters a clean water tank after being disinfected by adding disinfectant, water is supplied to the outside by a water supply pump, meanwhile, a backwashing pump is used for carrying out timed backwashing on the sand filter, and backwashing water of the sand filter and sludge discharged from a sedimentation tank are discharged by a discharge tank; the traditional water treatment process has low impact resistance, the turbidity of the effluent water is difficult to reach the standard, and the sense of the water is poor; the ultrafiltration modification of the traditional water treatment system is to carry out advanced treatment of UFS (ultra filtration system) after the outlet water of the sand filter is disinfected, specifically, the X point of the pipeline from the sand filter to the clean water tank is cut off first, and the outlet water SF of the sand filter is treatedoutConnected to the water inlet of the UFS, and the water outlet of the UFS is fed out of the UFoutReturning to the clean water tank, and draining UF from the ultrafiltration system through the water outlet of the UFSeSending to a discharge tank; the advanced treatment of an ultrafiltration system is adopted to transform the device of the village and town water plant by using ultrafiltration, so that the turbidity of the outlet water is changed from 1-5 NTU to a turbidity less than or equal to 0.1 NTU, the total number of colonies is less than or equal to 10 CFU/mL and is far higher than the requirement of GB 5749 plus 2006 sanitary Standard for Drinking Water, the water quality of the outlet water is greatly improved from sense to bacterial index, the drinking water quality of the users in the vast villages and towns is improved, and the new rural construction is powerfully promoted.
Referring to FIG. 2, the UFS comprises an intermediate water tank MT and a booster pump P1Self-cleaning filter AF, ultrafiltration device UF and backwashing fanB. Dosing device DE, ultrafiltration backwash pump P2A backwashing water tank BWT; wherein the sand filter goes out water SFoutIs connected to the water inlet of the intermediate water tank MT, and the water outlet of the intermediate water tank MT passes through the booster pump P1The water outlet of the self-cleaning filter AF is connected with the water inlet of the ultrafiltration device UF; the water outlet of the ultrafiltration device UF is connected to the water inlet of the backwashing water tank BWT, and the 1# water outlet of the backwashing water tank BWT passes through the ultrafiltration backwashing pump P2The back washing water inlet of the ultrafiltration device UF is connected, the medicine outlet of the medicine adding device DE is also connected to the back washing water inlet of the ultrafiltration device UF, and the air outlet of the back washing fan B is connected to the back washing air inlet of the ultrafiltration device UF; the cleaning water outlet of the self-cleaning filter AF and the backwashing water outlet of the ultrafiltration device UF are sent out of the ultrafiltration system to drain the UFe(ii) a The overflow of the No. 2 water outlet of the backwashing water tank BWT is sent out of the outlet water UF of the ultrafiltration systemout(ii) a Through an ultrafiltration system, specifically, the water outlet of the sand filter is buffered by using an intermediate water tank, the pressurization of a booster pump is controlled according to the flow variable frequency of ultrafiltration, the water outlet of the sand filter is filtered by using a self-cleaning filter with the filtering precision of 100 mu m, fine sand grains running out of the sand filter are filtered, the ultrafiltration membrane is prevented from being scratched, and ultrafiltration equipment is effectively protected; then PVDF ultrafiltration membrane with aperture less than or equal to 50nm is used for carrying out deep filtration on suspended matters and bacteria in water, the turbidity of sand filtration effluent is filtered from 1-5 NTU to that less than or equal to 0.1 NTU, the total number of colonies is less than or equal to 10 CFU/mL, and the requirement is far higher than GB 5749 plus 2006 sanitary Standard for Drinking Water, and the effluent quality of village and town water plants is greatly improved; sodium hypochlorite is added through a dosing device, a backwashing fan and a backwashing water pump are used for carrying out automatic air-water combined backwashing on the ultrafiltration at regular time, the backwashing time interval is 30-90 minutes, and the backwashing time is 30-60 seconds, so that the long-term stable operation of the ultrafiltration device is maintained.
The method for transforming the village and town water plant by using ultrafiltration comprises the following steps:
1) performing ultrafiltration modification in a village and town water plant, and inserting an ultrafiltration system by cutting off a pipeline between a water outlet of the sand filter and a water inlet of a clean water tank;
2) filtering the effluent of the sand filter by a self-cleaning filter, wherein the filtering precision is 100 mu m, and protecting an ultrafiltration membrane;
3) the effluent is deeply filtered by an ultrafiltration device, the turbidity of the ultrafiltration effluent is less than or equal to 0.1 NTU, the total number of floras is less than or equal to 10 CFU/mL and exceeds the drinking water quality requirement of GB 5749-;
4) the air-water combined backwashing is carried out on the ultrafiltration at regular time, so that the long-term stable operation of the ultrafiltration device is ensured.
Step 1) carrying out ultrafiltration modification on the village and town water plant, specifically, cutting off an X point of a pipeline behind a disinfectant adding point between a water outlet of a sand filter tank and a water inlet of a clean water tank, and inserting an ultrafiltration system for advanced treatment; the turbidity of the effluent is changed from 1-5 NTU to less than or equal to 0.1 NTU by using an ultrafiltration system, the total number of colonies is less than or equal to 10 CFU/mL and is far higher than the requirement of GB 5749 plus 2006 sanitary Standard for Drinking Water, and sensory and bacterial indexes of the effluent quality are greatly improved.
And 2) filtering the effluent of the sand filter tank through a self-cleaning filter, specifically, buffering the effluent of the sand filter tank by using an intermediate water tank, controlling the pressurization of a booster pump according to the flow variable frequency of ultrafiltration, filtering the effluent of the sand filter tank by using the self-cleaning filter with the filtering precision of 100 mu m, filtering fine sand grains escaping from the sand filter tank, avoiding scratching an ultrafiltration membrane, and effectively protecting ultrafiltration equipment.
And 3) performing deep filtration by using an ultrafiltration device, specifically performing deep filtration on suspended matters and bacteria in water by using a PVDF ultrafiltration membrane with the aperture less than or equal to 50nm, and filtering the turbidity of sand-filtered water from 1-5 NTU to a turbidity less than or equal to 0.1 NTU, wherein the total number of colonies is less than or equal to 10 CFU/mL and is far higher than the requirement of GB 5749 and 2006 sanitary Standard for Drinking Water, thereby greatly improving the quality of the effluent of village and town water plants.
And 4) carrying out air-water combined backwashing on the ultrafiltration, specifically adding sodium hypochlorite through a dosing device, and carrying out automatic air-water combined backwashing on the ultrafiltration by utilizing a backwashing fan and a backwashing water pump at regular time, wherein the backwashing time interval is 30-90 minutes, and the backwashing time is 30-60 seconds so as to maintain the long-term stable operation of the ultrafiltration device.
Examples
A certain village and town water plant is located in a mountainous area, river water is taken as a water source and is greatly influenced by the change of the quality of the river water caused by seasonal changes, and the effluent turbidity hardly reaches the standard and has poor sensory effect by adopting the traditional water treatment process of dosing coagulation, precipitation, filtration and disinfection. After the ultrafiltration system is adopted for carrying out the upgrading reconstruction project, the ultrafiltration effluent meets the requirements of GB 5749 and 2006 sanitary Standard for Drinking Water, and the effect is good.
The design is mainly the water quality and quantity of inlet and outlet water
The water supply amount of the ultrafiltration modification project of the water plant is as follows: 1500T/D.
The effluent of the ultrafiltration system of the ultrafiltration modification project of the water plant meets the requirements of GB 5749-:
the second grid value of the standard limit in the table is for small centralized water supply.
Process flow
2.1 Process flow
The process flow of the water plant ultrafiltration modification project is shown in the attached figure 3, and the overall modification process flow chart of the embodiment of utilizing ultrafiltration to modify the village and town water plants is shown in the figure.
The process flow of the ultrafiltration system is shown in the process flow chart of the ultrafiltration system of the embodiment of reforming the town water plant by ultrafiltration in the attached figure 4.
Description of the flow
Referring to the attached drawing 3, the general reconstruction process flow of the embodiment of the village and town water plant is reconstructed by ultrafiltration, river water is lifted to a coagulation tank by a water intake pump in a water intake pump room, coagulant is added for coagulation sedimentation and sand filter filtration, disinfectant is added for disinfection and then enters a clean water tank, water is supplied to the outside by a water supply pump in a water supply pump room, meanwhile, the sand filter is backwashed at regular time by a backwash pump in the water supply pump room, and backwash water of the sand filter and sludge discharged from a sedimentation tank are discharged through a discharge tank.
Referring to the attached figure 4, the process flow of the ultrafiltration system is that the effluent of the sand filter flows into an intermediate water tank, is pressurized by a booster pump in sequence, enters an ultrafiltration device after fine sand is filtered by a self-cleaning filter with the filtering precision of 100 mu m, utilizes a PVDF ultrafiltration membrane with the aperture less than or equal to 50nm to carry out deep filtration, intercepts a large amount of suspended matters and bacteria, enters a backwashing water tank, and ensures the stable operation of ultrafiltration by feeding chemicals once every 45 minutes for 60 seconds, and carrying out air-water combined backwashing by a backwashing fan and a backwashing water pump; in order to ensure that the backwashing water quantity of the backwashing water tank is sufficient, water is discharged to the original clean water tank in a backwashing water tank overflow mode; and the backwashing water of the ultrafiltration and the backwashing water of the self-cleaning filter enter an original discharge tank.
Main design parameters of ultrafiltration system
3.1 civil engineering:
| serial number | Name (R) | Specification of | Unit of | Number of | Structural form |
| 1 | New ultrafiltration workshop | 11.5mX6.0mX5.0m | Seat | 1 | Light steel heat preservation |
3.2 Main equipment:
Claims (9)
1. the device for transforming the village and town water plant by utilizing ultrafiltration is characterized by comprising a traditional water treatment system and an ultrafiltration system, wherein the traditional water treatment system comprises a water taking pump, a coagulation tank, a sedimentation tank, a sand filter tank, a clean water tank, a water supply pump, a backwashing pump and a discharge tank, a water outlet of the water taking pump is connected with a water inlet of the coagulation tank, a water outlet of the coagulation tank is connected with a water inlet of the sedimentation tank, a water outlet of the sedimentation tank is connected with a water inlet of the sand filter tank, a water outlet of the sand filter,
a disinfectant feeding point is arranged between the sand filter and the clean water tank, a first water outlet of the clean water tank is connected with a water inlet of a water supply pump, a second water outlet of the clean water tank is connected with a water inlet of a backwashing pump, a water outlet of the backwashing pump is connected with a water inlet of the sand filter, and a sludge discharge port of the sedimentation tank and a backwashing water outlet of the sand filter are connected with a discharge tank; the ultrafiltration system is arranged between the sand filter and the clean water tank, and after a disinfectant feeding point, the system comprises an intermediate water tank, a self-cleaning filter, an ultrafiltration device, a dosing device and a backwashing water tank, wherein the outlet water of the sand filter is connected to the water inlet of the intermediate water tank, the water outlet of the intermediate water tank is connected with the water inlet of the self-cleaning filter, the water outlet of the self-cleaning filter is connected to the water inlet of the ultrafiltration device, the water outlet of the ultrafiltration device is connected to the water inlet of the backwashing water tank, the No. 1 water outlet of the backwashing water tank is connected to the backwashing water inlet of the ultrafiltration device through an ultrafiltration backwashing pump, the drug outlet of the dosing device is also connected to the backwashing water inlet of the ultrafiltration device, and the No. 2 water outlet of the.
2. The device for transforming the village and town water plant by using ultrafiltration as claimed in claim 1, wherein the ultrafiltration system comprises an intermediate water tank, a booster pump, a self-cleaning filter, an ultrafiltration device, a backwash fan, a dosing device, an ultrafiltration backwash pump and a backwash water tank; wherein the water outlet of the sand filter is connected with the water inlet of the middle water tank, the water outlet of the middle water tank is connected with the water inlet of the self-cleaning filter through a booster pump, and the water outlet of the self-cleaning filter is connected with the water inlet of the ultrafiltration device; the water outlet of the ultrafiltration device is connected to the water inlet of the backwashing water tank, the No. 1 water outlet of the backwashing water tank is connected to the backwashing water inlet of the ultrafiltration device through an ultrafiltration backwashing pump, the medicine outlet of the medicine adding device is also connected to the backwashing water inlet of the ultrafiltration device, and the air outlet of the backwashing fan is connected to the backwashing air inlet of the ultrafiltration device; a cleaning water outlet of the self-cleaning filter and a backwashing water outlet of the ultrafiltration device are sent out of the ultrafiltration system for drainage; and the No. 2 water outlet of the backwashing water tank overflows and is sent out of the ultrafiltration system to discharge water.
3. The device for reforming the village and town water plant by using the ultrafiltration as claimed in claim 2, wherein in the ultrafiltration system, a self-cleaning filter has a filtration precision of 100 μm, a PVDF ultrafiltration membrane with an aperture of less than or equal to 50nm is adopted in the ultrafiltration device, and the dosing device is a sodium hypochlorite dosing device.
4. The apparatus for transforming village and town water plants using ultrafiltration as claimed in claim 2, wherein said ultrafiltration system is operated by the method comprising the steps of:
(1) and (3) buffering the water discharged from the sand filter by using the intermediate water tank, controlling the pressurization of the booster pump according to the ultrafiltration flow rate through frequency conversion, and adjusting the frequency converter to be 40-55 Hz to ensure that the ultrafiltration flow rate is stabilized within +/-5% of a set value Q.
(2) The self-cleaning filter with the filtering precision of 100 mu m is used for filtering the effluent of the sand filter, so as to filter fine sand grains running out of the sand filter, avoid scratching an ultrafiltration membrane and effectively protect ultrafiltration equipment;
(3) PVDF ultrafiltration membranes with the pore diameter of less than or equal to 50nm are used for carrying out deep filtration on suspended matters and bacteria in water, the turbidity of sand-filtered effluent is filtered from 1-5 NTU to less than or equal to 0.1 NTU, the total number of colonies is less than or equal to 10 CFU/mL and is far higher than the requirement of GB 5749 and 2006 sanitary Standard for Drinking Water, and the effluent quality of village and town water plants is greatly improved;
(4) sodium hypochlorite is added through a dosing device, a backwashing fan and a backwashing water pump are used for carrying out automatic air-water combined backwashing on ultrafiltration at regular time, the backwashing time interval is 30-90 minutes, and the backwashing time is 30-60 seconds, so that the long-term stable operation of the ultrafiltration device is maintained.
5. The apparatus for reconstructing a village and town water plant using ultrafiltration as claimed in claim 1, wherein said method for reconstructing said apparatus for a village and town water plant using ultrafiltration comprises the steps of:
1) performing ultrafiltration modification in a village and town water plant, and inserting an ultrafiltration system by cutting off a pipeline between a water outlet of the sand filter and a water inlet of a clean water tank;
2) filtering the effluent of the sand filter by a self-cleaning filter, wherein the filtering precision is 100 mu m, and protecting an ultrafiltration membrane;
3) the effluent is deeply filtered by an ultrafiltration device, the turbidity of the ultrafiltration effluent is less than or equal to 0.1 NTU, the total number of floras is less than or equal to 10 CFU/mL and exceeds the drinking water quality requirement of GB 5749-;
4) the long-term stable operation of the ultrafiltration device is ensured by carrying out timed air-water combined backwashing on the ultrafiltration.
6. The method for transforming the village and town water plant by using ultrafiltration as claimed in claim 5, wherein the step 1) comprises the step of performing ultrafiltration transformation on the village and town water plant, namely, inserting an ultrafiltration system for advanced treatment by intercepting an X point of a pipeline behind a disinfectant adding point between a water outlet of a sand filter tank and a water inlet of a clean water tank; the turbidity of the effluent is changed from 1-5 NTU to less than or equal to 0.1 NTU by using an ultrafiltration system, the total number of colonies is less than or equal to 10 CFU/mL and is far higher than the requirement of GB 5749 plus 2006 sanitary Standard for Drinking Water, and sensory and bacterial indexes of the effluent quality are greatly improved.
7. The method for reconstructing a village and town water plant by using ultrafiltration as claimed in claim 5, wherein in said step 2) the effluent of the sand filter is filtered by a self-cleaning filter, specifically, the effluent of the sand filter is buffered by an intermediate water tank, the pressurization of the booster pump is controlled according to the ultrafiltration flow rate by means of frequency conversion, the effluent of the sand filter is filtered by the self-cleaning filter with the filtering precision of 100 μm, and fine sand grains escaping from the sand filter are filtered out, so that the ultrafiltration membrane is prevented from being scratched, and the ultrafiltration equipment is effectively protected.
8. The method for transforming the village and town water plant by using ultrafiltration as claimed in claim 5, wherein in the step 3), the suspended matters and bacteria in the water are subjected to depth filtration by an ultrafiltration device, specifically, a PVDF ultrafiltration membrane with the pore diameter less than or equal to 50nm is used for depth filtration, the turbidity of the sand-filtered water is filtered from 1 to 5 NTU to less than or equal to 0.1 NTU, the total number of colonies is less than or equal to 10 CFU/mL and is far higher than the requirement of GB 5749 and 2006 sanitary Standard for Drinking Water, and the quality of the effluent of the village and town water plant is greatly improved.
9. The method for reforming the village and town water plant by using ultrafiltration as claimed in claim 5, wherein in the step 4), air-water combined backwashing is performed at regular time of ultrafiltration, specifically, sodium hypochlorite is added by a chemical adding device, and automatic air-water combined backwashing is performed at regular time of a backwashing fan and a backwashing water pump for ultrafiltration, wherein the backwashing time interval is 30-90 minutes, and the backwashing time is 30-60 seconds, so as to maintain long-term stable operation of the ultrafiltration device.
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| CN202110290905.7A CN112919688A (en) | 2021-03-18 | 2021-03-18 | Device and method for transforming town water plant by ultrafiltration |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115340231A (en) * | 2022-08-05 | 2022-11-15 | 上海城市水资源开发利用国家工程中心有限公司 | Multi-stage filtration field water purification device and method suitable for multiple persons and multiple scenes |
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| CN103086543A (en) * | 2013-02-01 | 2013-05-08 | 太平洋水处理工程有限公司 | Mobile container water plant and water production process thereof |
| WO2017219892A1 (en) * | 2016-06-22 | 2017-12-28 | 江苏达格水务有限公司 | Raw ecological water treatment process and treatment system adopting the same |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103086543A (en) * | 2013-02-01 | 2013-05-08 | 太平洋水处理工程有限公司 | Mobile container water plant and water production process thereof |
| WO2017219892A1 (en) * | 2016-06-22 | 2017-12-28 | 江苏达格水务有限公司 | Raw ecological water treatment process and treatment system adopting the same |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115340231A (en) * | 2022-08-05 | 2022-11-15 | 上海城市水资源开发利用国家工程中心有限公司 | Multi-stage filtration field water purification device and method suitable for multiple persons and multiple scenes |
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