Drinking water treatment system

Abstract

The utility model discloses a drinking water treatment system which comprises a pretreatment unit, a flocculation unit, an air floatation unit, a filtering unit and a disinfection unit which are arranged in sequence, the pretreatment unit removes part of organic matters and suspended solids causing chromaticity, turbidity, odor and peculiar smell in water by utilizing the oxidation effect of ozone, and the flocculation unit is used for flocculation; and organic matters can be partially decomposed and microorganisms can be inactivated. The pretreated water enters the flocculation unit, and pollutants in the water are adsorbed and flocculated by adopting an electric flocculation working mode. The flocculated water enters the air floatation unit, the air floatation unit adsorbs pollutants in the water by using micro bubbles, and the bubbles float upwards to remove the pollutants. The water subjected to air floatation treatment enters the filtering unit to be filtered, the filtering unit adopts a ceramic membrane to filter the water, tiny impurities in the water are removed, and all or most of bacteria, viruses and other microorganisms in the water can be filtered out. And purified water obtained after filtration of the ceramic membrane enters the disinfection unit for disinfection treatment.

Description

Technical Field

[0001] The utility model relates to the technical field of water treatment, in particular to a drinking water treatment system. Background Technique

[0002] The quality, hygiene and safety of drinking water play an extremely important role in human health. At present, most of the tap water treatment processes in China still adopt the conventional processes of coagulation, sedimentation, filtration and chlorination disinfection formed in the early 20th century. This process is based on the premise of having qualified water sources, and mainly aims to reduce the pathogenic microorganisms and viruses that spread infectious diseases in drinking water and eliminate the infectious diseases brought by pathogenic microorganisms to people.

[0003] With the rapid development of industrialization and agricultural production, the emissions of various pollutants and the usage amounts of pesticides, fungicides and herbicides have increased, resulting in major changes in the local water environment and the water body background, and the situation is becoming more and more complicated. The conventional water treatment process cannot effectively remove organic matters in water, especially dissolved organic matters, and it is difficult to remove new pathogenic microorganisms, such as small-sized parasites like Cryptosporidium and Microsporidium, with conventional filtration techniques. The water containing organic pollutants will also generate "three-causing" substances such as organic halides after chlorination disinfection. Therefore, people urgently expect to develop new processes and technologies to improve the safety of drinking water and build a safety protection barrier for maintaining human health. Content of the Utility Model

[0004] The purpose of the utility model is to provide a drinking water treatment system to solve the problems existing in the above-mentioned prior art, improve the safety of drinking water, and save the water treatment cost at the same time.

[0005] To achieve the above purpose, the utility model provides the following scheme:

[0006] The utility model provides a drinking water treatment system, including:

[0007] A pretreatment unit, the water inlet of the pretreatment unit is communicated with the raw water inlet, and the pretreatment unit can introduce ozone into the water to perform pretreatment on the water;

[0008] A flocculation unit, the water outlet of the pretreatment unit is communicated with the water inlet of the flocculation unit, and the flocculation unit adopts electroflocculation to adsorb and flocculate pollutants in the water;

[0009] An air flotation unit for adsorbing pollutants in the water;

[0010] A filtration unit, the water outlet of the air flotation unit is communicated with the water inlet of the filtration unit, and a ceramic membrane is arranged in the filtration unit to filter the water;

[0011] A disinfection unit, wherein the water outlet of the filter unit is connected to the water inlet of the disinfection unit, and the disinfection unit is used to disinfect water.

[0012] Preferably, the pretreatment unit is connected to an ozone generator, which converts oxygen into ozone by high-voltage discharge. The ozone generator is connected to the pretreatment unit to introduce ozone into the water entering the pretreatment unit.

[0013] Preferably, the air flotation unit adopts an electrical flotation method, electrolysis generates tiny bubbles to adsorb pollutants in the water, and floats up to remove the pollutants.

[0014] Preferably, when the air flotation unit adopts an electrical flotation method, the flocculation unit and the air flotation unit are combined into a comprehensive processing unit.

[0015] Preferably, the flotation unit adopts a dissolved air flotation method to generate microbubbles in the water to absorb pollutants in the water, and floats up to remove the pollutants.

[0016] Preferably, the disinfection unit adopts a disinfection method of electrolyzing salt water to produce sodium hypochlorite.

[0017] Preferably, the drinking water treatment system further includes a sedimentation unit, the slag discharge port of the flotation unit is connected to the water inlet of the sedimentation unit via a slag discharge pipe, the wastewater outlet of the filtration unit is connected to the water inlet of the sedimentation unit via a wastewater pipe, and the supernatant of the sedimentation unit is refluxed to the raw water outlet via a reflux pipe.

[0018] Preferably, the sedimentation unit is also connected to a sludge drying unit, and the sludge precipitated by the sedimentation unit is dehydrated in the sludge drying unit. The sludge drying unit adopts an electric sludge drying method, and the sludge drying unit has a dry sludge outlet.

[0019] Preferably, the pretreatment unit, the flocculation unit, the flotation unit, the filtration unit and the disinfection unit are respectively connected by conveying pipelines, and control valves are provided between the pretreatment unit, the flocculation unit, the flotation unit, the filtration unit and the disinfection unit.

[0020] Compared with the prior art, the utility model has achieved the following technical effects: the drinking water treatment system of the utility model comprises a pretreatment unit, a flocculation unit, an air flotation unit, a filtration unit and a disinfection unit which are arranged in sequence, wherein the water inlet of the pretreatment unit is connected with the raw water inlet, and the pretreatment unit can introduce ozone into the water to pretreat the water; the water outlet of the pretreatment unit is connected with the water inlet of the flocculation unit, and the flocculation unit adopts an electric flocculation method to adsorb and flocculate pollutants in the water; the air flotation unit is used to adsorb pollutants in the water; the water outlet of the air flotation unit is connected with the water inlet of the filtration unit, and a ceramic membrane is arranged in the filtration unit to filter the water; the water outlet of the filtration unit is connected with the water inlet of the disinfection unit, and the disinfection unit is used to disinfect the water.

[0021] In the drinking water treatment system of the utility model, the water to be treated is introduced into the system from the raw water inlet, and first enters the pretreatment unit. The pretreatment unit uses the oxidation effect of ozone to remove some organic matter and suspended solids that cause color, turbidity, odor and peculiar smell in the water, and can partially decompose organic matter and inactivate microorganisms. The application of ozone will not produce harmful "three-causing" substances in the treatment process, thereby improving the safety of drinking water. The pretreated water enters the flocculation unit, and adopts the working mode of electric flocculation. For example, soluble metal aluminum is used as the electrode plate. Under the action of external voltage, the metal anode plate is dissolved to produce a large number of cations. These cations undergo a series of complex hydration and polycondensation to generate substances with flocculation effect, which adsorb and flocculate pollutants in the water, thereby removing them. The electric flocculation method has simple equipment, convenient operation, small footprint, and no other chemical agents need to be added during the reaction process, thereby saving the cost of drinking water treatment. The water after flocculation treatment enters the air flotation unit, and the air flotation unit uses tiny bubbles to adsorb pollutants in the water, and the bubbles float to remove the pollutants. The water after flotation treatment enters the filtration unit for filtration. The filtration unit uses ceramic membrane to filter the water to remove tiny impurities in the water. It can filter out all or most of the bacteria, viruses and other microorganisms in the water. The ceramic membrane has the advantages of high temperature resistance, good chemical stability, high strength, and long service life. The purified water obtained after filtration by the ceramic membrane enters the disinfection unit for disinfection treatment, further improving the safety factor of drinking water. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0023] Figure 1A schematic diagram of a drinking water treatment system disclosed in an embodiment of the utility model;

[0024] Figure 2 A schematic diagram of a sludge drying unit provided in a drinking water treatment system disclosed in an embodiment of the utility model;

[0025] Figure 3 This is a schematic diagram of an integrated structure of a flocculation unit and an air flotation unit of a drinking water treatment system disclosed in an embodiment of the utility model.

[0026] In the figure: 1. Raw water inlet; 2. Pretreatment unit; 3. Flocculation unit; 4. Flotation unit; 5. Filtration unit; 6. Disinfection unit; 7. Sedimentation unit; 8. Slag discharge pipe; 9. Wastewater pipe; 10. Reflux pipe; 11. Sludge drying unit; 12. Dry sludge outlet; 13. Sludge pipe; 14. Water purification inlet; 15. Comprehensive treatment unit. DETAILED DESCRIPTION

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

[0028] The purpose of the utility model is to provide a drinking water treatment system to solve the problems existing in the above-mentioned prior art, improve the safety of drinking water, and save water treatment costs.

[0029] In order to make the above-mentioned purposes, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0030] The utility model provides a drinking water treatment system, comprising a pretreatment unit 2, a flocculation unit 3, an air flotation unit 4, a filtration unit 5 and a disinfection unit 6 which are arranged in sequence, wherein the water inlet of the pretreatment unit 2 is connected with the raw water inlet 1, and the pretreatment unit 2 can introduce ozone into the water to pretreat the water; the water outlet of the pretreatment unit 2 is connected with the water inlet of the flocculation unit 3, and the flocculation unit 3 adopts an electric flocculation method to adsorb and flocculate pollutants in the water; the air flotation unit 4 is used to adsorb pollutants in the water; the water outlet of the air flotation unit 4 is connected with the water inlet of the filtration unit 5, and a ceramic membrane is arranged in the filtration unit 5 to filter the water; the water outlet of the filtration unit 5 is connected with the water inlet of the disinfection unit 6, and the disinfection unit 6 is used to disinfect the water.

[0031] In the drinking water treatment system of the utility model, the water to be treated is introduced into the treatment system from the raw water inlet 1, and first enters the pretreatment unit 2. The pretreatment unit 2 uses the oxidation effect of ozone to remove some organic matter and suspended solids that cause color, turbidity, odor and peculiar smell in the water, and can partially decompose organic matter and inactivate microorganisms. The application of ozone will not produce harmful "three-causing" substances in the treatment process, thereby improving the safety of drinking water. The pretreated water enters the flocculation unit 3, and adopts the working mode of electric flocculation. For example, soluble metal aluminum is used as the electrode plate. Under the action of external voltage, the metal anode plate is dissolved to produce a large number of cations. These cations undergo a series of complex hydration and polycondensation to generate substances with flocculation effect, which adsorb and flocculate pollutants in the water, thereby removing them. The use of the electric flocculation method has simple equipment, convenient operation, small footprint, and no need to add any other chemical agents during the reaction process, saving the cost of drinking water treatment. The water after flocculation treatment enters the air flotation unit 4, and the air flotation unit 4 uses the generated tiny bubbles to adsorb pollutants in the water, and the bubbles float to remove the pollutants. The water after flotation treatment enters the filter unit 5 for filtration. The filter unit 5 uses a ceramic membrane to filter the water to remove tiny impurities in the water. It can filter out all or most of the bacteria, viruses and other microorganisms in the water. The ceramic membrane has the advantages of high temperature resistance, good chemical stability, high strength, and a long service life. The purified water obtained after filtration by the ceramic membrane enters the disinfection unit 6 for disinfection treatment, further improving the safety factor of drinking water.

[0032] Among them, the pretreatment unit 2 is connected to an ozone generator, which uses high-voltage discharge to convert oxygen into ozone. The ozone generator is connected to the pretreatment unit 2 to introduce ozone into the water entering the pretreatment unit 2. The ozone generator is set to ensure the normal operation of the pretreatment unit 2.

[0033] The pre-treated water enters the flocculation unit 3. Under the action of the external voltage, the anode plate used for electroflocculation is corroded to produce a large number of cations. These cations undergo a series of complex hydration and polycondensation to generate substances with flocculation effects, which adsorb and flocculate the pollutants in the water, thereby removing them. The flocculated water enters the flotation unit 4. A large number of highly dispersed microbubbles are introduced into the water. The impurities in the water collide and adhere to the dispersed microbubbles, and float to the water surface under the action of buoyancy. It is also necessary to explain here that in actual applications, the flotation unit 4 can be provided with a scraper, and the impurities floating to the water surface can be scraped off by the scraper to improve the working reliability of the flotation unit 4.

[0034] The working mode of the flotation unit 4 can be selected according to the actual working conditions. In the specific implementation mode that can be realized by the present invention, the flotation unit 4 can adopt an electrical flotation method, and the tiny bubbles of H2, O2 or Cl2 generated by electrolysis of water adsorb pollutants in the water, and float up to remove pollutants in the water.

[0035] It should be noted that when the air flotation unit 4 adopts the electrical flotation method, the flocculation unit 3 and the air flotation unit 4 are integrated into a comprehensive treatment unit 15. For example, when electrolyzing aluminum metal plates, in addition to generating a large amount of cations and generating substances with flocculation effects, tiny bubbles such as H2, O2 or Cl2 are also generated to absorb pollutants in the water and float to remove pollutants in the water. Therefore, the flocculation unit 3 and the air flotation unit 4 using the electrical flotation method can be combined into a comprehensive treatment unit 15, see Figure 3 , simplify the system structure, improve system adaptability, and reduce the difficulty of maintenance during system operation.

[0036] In other specific embodiments that can be realized by the utility model, the air flotation unit 4 can also adopt a dissolved air flotation method to generate microbubbles in the water to absorb pollutants in the water, and float to remove pollutants. Specifically, a centrifugal pump and an air compressor are used to press water and air into a dissolved air tank at the same time, and air is dissolved in water in the dissolved air tank. The dissolved air water is sent to the air flotation unit 4 after passing through a pressure release valve; as the pressure decreases, the dissolved air water is in an oversaturated state, and the dissolved air is released in the form of microbubbles, thereby completing the water purification process.

[0037] It should also be emphasized that the disinfection unit 6 of the utility model adopts a disinfection method of electrolyzing salt water to produce sodium hypochlorite, using a sodium hypochlorite generator to electrolyze salt water to produce sodium hypochlorite, which is added to water for disinfection. The disinfection process equipment only needs to add salt water, and no other agents need to be added, which is beneficial to improving the quality of drinking water and saving production costs.

[0038] The drinking water treatment system of the utility model also includes a sedimentation unit 7. The slag discharge port of the flotation unit 4 is connected to the water inlet of the sedimentation unit 7 via a slag discharge pipe 8. The wastewater outlet of the filtration unit 5 is connected to the water inlet of the sedimentation unit 7 via a wastewater pipe 9. The water-carrying slag separated by the flotation unit 4 and the wastewater discharged by the ceramic membrane filtration enter the sedimentation unit 7 for sedimentation treatment. The supernatant of the sedimentation unit 7 is refluxed to the raw water inlet 1 via a reflux pipe 10 for further treatment, thereby saving water resources.

[0039] In order to process the sludge precipitated by the sedimentation unit 7, the sedimentation unit 7 is also connected to a sludge drying unit 11. The sludge precipitated by the sedimentation unit 7 is dehydrated in the sludge drying unit 11, and the sludge is dried and harmlessly treated. The sludge outlet of the sedimentation unit 7 is connected to the sludge drying unit 11 by a sludge pipe 13. The sludge drying unit 11 adopts an electric sludge drying method. The sludge drying unit 11 has a dry sludge outlet 12, which is convenient for centralized treatment.

[0040] In actual applications, the pretreatment unit 2, the flocculation unit 3, the flotation unit 4, the filtration unit 5 and the disinfection unit 6 are respectively connected by conveying pipelines, and control valves are provided between the pretreatment unit 2, the flocculation unit 3, the flotation unit 4, the filtration unit 5 and the disinfection unit 6 to facilitate control of the operating status of the system, improve the operating reliability of the system, and improve the operating convenience of the operator.

[0041] In the drinking water treatment system of the utility model, raw water enters the pretreatment unit 2 from the raw water inlet 1 for pretreatment, and uses ozone to oxidize and remove inorganic matter in the water, decompose organic matter and inactivate microorganisms. The water after ozone pretreatment enters the flocculation unit 3, and the flocculation unit 3 uses an electrolytic aluminum plate to generate a substance with a flocculation effect to adsorb and flocculate pollutants in the water. The water after the flocculation process enters the flotation unit 4, and after the scum is separated, it enters the filtration unit 5 provided with a ceramic membrane for filtration. The filtered water passes through the disinfection unit 6, and sodium hypochlorite is generated by electrolyzing salt water, and is added to the water for disinfection. After disinfection, it is output from the water purification outlet 14 to complete the entire water treatment process.

[0042] The present invention uses specific examples to illustrate the principle and implementation of the present invention. The above examples are only used to help understand the method and core idea of ​​the present invention. At the same time, for those skilled in the art, according to the idea of ​​the present invention, there will be changes in the specific implementation and application scope. In summary, the content of this specification should not be understood as limiting the present invention.

Claims

1. A drinking water treatment system, characterized in that: Including the following settings: A pretreatment unit, wherein the water inlet of the pretreatment unit is connected to the raw water inlet, and the pretreatment unit can introduce ozone into the water to pretreat the water; A flocculation unit, wherein the water outlet of the pretreatment unit is connected to the water inlet of the flocculation unit, and the flocculation unit adopts an electric flocculation method to adsorb and flocculate pollutants in water; An air flotation unit, the air flotation unit is used to absorb pollutants in water; A filter unit, wherein the water outlet of the air flotation unit is connected to the water inlet of the filter unit, and a ceramic membrane is provided in the filter unit to filter water; A disinfection unit, wherein the water outlet of the filter unit is connected to the water inlet of the disinfection unit, and the disinfection unit is used to disinfect water.

2. The drinking water treatment system according to claim 1, characterized in that: The pretreatment unit is connected to an ozone generator, which converts oxygen into ozone by high-voltage discharge. The ozone generator is connected to the pretreatment unit to introduce ozone into the water entering the pretreatment unit.

3. The drinking water treatment system according to claim 1, characterized in that: The air flotation unit adopts an electrical flotation method, electrolyzing to generate tiny bubbles to absorb pollutants in the water, and then floats up to remove the pollutants.

4. The drinking water treatment system according to claim 3, characterized in that: When the air flotation unit adopts the electrical flotation method, the flocculation unit and the air flotation unit are combined into a comprehensive processing unit.

5. The drinking water treatment system according to claim 1, characterized in that: The air flotation unit adopts a dissolved air flotation method to generate micro bubbles in the water to absorb pollutants in the water, and floats up to remove the pollutants.

6. The drinking water treatment system according to claim 1, characterized in that: The disinfection unit adopts a disinfection method of electrolyzing salt water to produce sodium hypochlorite.

7. The drinking water treatment system according to any one of claims 1 to 6, characterized in that: It also includes a sedimentation unit, the slag discharge port of the flotation unit is connected to the water inlet of the sedimentation unit via a slag discharge pipe, the wastewater outlet of the filtration unit is connected to the water inlet of the sedimentation unit via a wastewater pipe, and the supernatant of the sedimentation unit is refluxed to the raw water outlet via a reflux pipe.

8. The drinking water treatment system according to claim 7, characterized in that: The sedimentation unit is also connected to a sludge drying unit. The sludge precipitated by the sedimentation unit is dehydrated in the sludge drying unit. The sludge drying unit adopts an electric sludge drying method and has a dry sludge outlet.

9. The drinking water treatment system according to claim 1, characterized in that: The pretreatment unit, the flocculation unit, the air flotation unit, the filtration unit and the disinfection unit are respectively connected by conveying pipelines, and control valves are arranged between the pretreatment unit, the flocculation unit, the air flotation unit, the filtration unit and the disinfection unit.

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