Softening and filtering treatment system

Abstract

The utility model provides a softening and filtering treatment system. The softening and filtering treatment system comprises an ultrafiltration device (1); the water inlet end of the ultrafiltration backwashing water collecting tank (2) is connected with the ultrafiltration backwashing water outlet end of the ultrafiltration device (1); the water inlet end of the pipeline mixer (3) is connected with the water outlet end of the ultrafiltration backwashing water collecting tank (2); the water inlet end of the first mechanical filtering device (4) is connected with the water outlet end of the pipeline mixer (3); according to the system, the ultrafiltration backwashing wastewater is independently collected and treated through the ultrafiltration backwashing water collecting tank, so that backflow of the wastewater in the system is reduced, the water treatment amount of the softening system is reduced compared with that of a traditional process, and the chemical consumption during water treatment can be remarkably reduced based on the treatment amount; therefore, the economical efficiency and efficiency of water treatment work are improved, the dosage of chemical agents required by water treatment is reduced, and the water treatment cost is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of water treatment, in particular to a softening and filtering treatment system. Background Art

[0002] Chemical softening and filtration treatment technology has been widely used in water treatment processes in chemical, metallurgical, electric power, new energy and other industries. It plays an irreplaceable role in water purification, reclaimed water treatment and reuse, high-salt water treatment and zero-emission workshops.

[0003] Various chemical agents are inevitably required in the process of chemical softening and filtration treatment, including sodium carbonate, slaked lime, liquid alkali, acid (hydrochloric acid or sulfuric acid), coagulant, flocculant, etc. The existing chemical softening and filtration treatment technology often requires frequent backwashing of the ultrafiltration device, generally once every 30 to 90 minutes of operation. The amount of wastewater generated by the backwashing of the ultrafiltration device is generally about 10% of the average water intake.

[0004] However, since the ultrafiltration backwash wastewater generated by the chemical softening and filtration process in the relevant technology will be returned to the raw water regulating tank for treatment, the amount of water that needs to be treated during softening and filtration treatment has increased by about 10%, which in turn has led to an increase in the consumption of various chemical agents by about 5% to 10%, thereby pushing up the cost of water treatment. Utility Model Content

[0005] The purpose of the utility model is to provide a softening and filtering treatment system to solve the problem that the ultrafiltration backwash wastewater generated by the chemical softening and filtration process in the related technology will be returned to the raw water regulating tank for treatment, which in turn leads to an increase in the amount of water that needs to be treated during the softening and filtration treatment, and then leads to an increase in the consumption of various chemical agents, thereby pushing up the cost of water treatment.

[0006] In order to achieve the above purpose, the technical solution adopted by the utility model is as follows:

[0007] A softening and filtering treatment system, comprising:

[0008] Ultrafiltration device (1);

[0009] An ultrafiltration backwash water collection tank (2), wherein a water inlet of the ultrafiltration backwash water collection tank (2) is connected to a water outlet of the ultrafiltration backwash water of the ultrafiltration device (1);

[0010] A pipeline mixer (3), wherein the water inlet end of the pipeline mixer (3) is connected to the water outlet end of the ultrafiltration backwash water collection tank (2);

[0011] A first mechanical filtering device (4), wherein a water inlet end of the first mechanical filtering device (4) is connected to a water outlet end of the pipeline mixer (3).

[0012] Optionally, the softening and filtration treatment system further includes:

[0013] A filtered water production tank (5), the water outlet end of the filtered water production tank (5) is connected to the water inlet end of the ultrafiltration device (1), and the water outlet end of the first mechanical filtration device (4) is connected to the water inlet end of the filtered water production tank (5);

[0014] An ultrafiltration water production tank (6), the product water inlet end of the ultrafiltration water production tank (6) is connected to the product water outlet end of the ultrafiltration device (1).

[0015] Optionally, the softening and filtration treatment system further includes:

[0016] A second mechanical filtration device (7), the water outlet end of the second mechanical filtration device (7) is connected to the water inlet end of the filtered water production tank (5).

[0017] Optionally, the softening and filtration treatment system further includes:

[0018] A softened water production tank (8), the water outlet end of the softened water production tank (8) is connected to the water inlet end of the second mechanical filtration device (7).

[0019] Optionally, the softening and filtration treatment system further includes a raw water regulating tank (9), and a softening device (10) is provided between the water outlet end of the raw water regulating tank (9) and the water inlet end of the softened water production tank (8).

[0020] Optionally, the softening device (10) includes:

[0021] A first softening reaction tank (11), the water inlet end of the first softening reaction tank (11) is connected to the water outlet end of the raw water regulating tank (9), and the first softening reaction tank (11) is further connected to a liquid caustic soda dosing device (12).

[0022] Optionally, the softening device (10) further includes:

[0023] A second softening reaction tank (13), the water inlet end of the second softening reaction tank (13) is connected to the water outlet end of the first softening reaction tank (11), and the second softening reaction tank (13) is further connected to a sodium carbonate dosing device (14) and a coagulant dosing device (15).

[0024] Optionally, the softening device (10) further includes:

[0025] A flocculation tank (16), the water inlet end of the flocculation tank (16) is connected to the water outlet end of the second softening reaction tank (13), and the flocculation tank (16) is further connected to a flocculant dosing device (17);

[0026] A sedimentation tank (18), the water inlet end of the sedimentation tank (18) is connected to the water outlet end of the flocculation tank (16).

[0027] Optionally, the softening device (10) further includes:

[0028] A pH adjustment tank (19), the water outlet end of the pH adjustment tank (19) is connected to the water inlet end of the softened water production tank (8), the water inlet end of the pH adjustment tank (19) is connected to the water outlet end of the sedimentation tank (18), and the pH adjustment tank (19) is further connected to an acidic chemical dosing device (20).

[0029] Optionally, the mechanical filtration device is a multi-media filter, and the multi-media filter is filled with at least one or more of anthracite and quartz sand.

[0030] Advantages of the present utility model:

[0031] The present utility model provides a softening and filtration treatment system, including: an ultrafiltration device (1); an ultrafiltration backwash water collection tank (2), the water inlet end of the ultrafiltration backwash water collection tank (2) is connected to the ultrafiltration backwash water outlet end of the ultrafiltration device (1); a pipe mixer (3), the water inlet end of the pipe mixer (3) is connected to the water outlet end of the ultrafiltration backwash water collection tank (2); a first mechanical filtration device (4), the water inlet end of the first mechanical filtration device (4) is connected to the water outlet end of the pipe mixer (3). It realizes the separate collection of ultrafiltration backwash wastewater through the ultrafiltration backwash water collection tank, and performs micro-flocculation treatment and filtration treatment on the ultrafiltration backwash water through the pipe mixer and the mechanical filtration device respectively. Thus, by separately treating the ultrafiltration backwash wastewater, the backflow of wastewater in the system is reduced. Not only does the softening system reduce the amount of water to be treated compared with the traditional process, but also the consumption of chemical agents during water treatment can be significantly reduced based on this. Furthermore, the economy and efficiency of water treatment work are improved, the dosage of chemical agents required for water treatment is reduced, and the water treatment cost is reduced. Description of the Drawings

[0032] In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the drawings required for the description of the embodiments of the present utility model will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present utility model. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0033] Figure 1 It is a structural schematic diagram of a softening and filtration treatment system provided by an embodiment of the present utility model.

[0034] Explanation of the accompanying drawings: 1-ultrafiltration device; 2-ultrafiltration backwash water collection tank, 3-pipeline mixer, 4-first mechanical filtration device, 5-filtration water production tank, 6-ultrafiltration water production tank, 7-second mechanical filtration device; 8-softening water production tank, 9-raw water regulating tank, 10-softening device; 11-first softening reaction tank, 12-liquid alkali delivery device, 13-second softening reaction tank, 14-sodium carbonate delivery device, 15-coagulant delivery device, 16-flocculation tank, 20-acidic agent delivery device. DETAILED DESCRIPTION

[0035] The following will describe the implementation of the present invention with reference to the accompanying drawings and preferred embodiments. Those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific implementations, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present invention. It should be understood that the preferred embodiments are only for illustrating the present invention, not for limiting the scope of protection of the present invention.

[0036] It should be noted that the illustrations provided in the following embodiments are only used to schematically illustrate the basic concept of the present invention. Therefore, the drawings only show components related to the present invention rather than being drawn according to the number, shape and size of components in actual implementation. In actual implementation, the shape, quantity and proportion of each component may be changed arbitrarily, and the component layout may also be more complicated.

[0037] Chemical softening and filtration treatment technology has been widely used in water treatment processes in chemical, metallurgical, electric power, new energy and other industries. It plays an irreplaceable role in water purification, reclaimed water treatment and reuse, high-salt water treatment and zero-emission workshops.

[0038] Various chemical agents are inevitably required in the process of chemical softening and filtration treatment, including sodium carbonate, slaked lime, liquid alkali, acid (hydrochloric acid or sulfuric acid), coagulant, flocculant, etc. The existing chemical softening and filtration treatment technology often requires frequent backwashing of the ultrafiltration device, generally once every 30 to 90 minutes of operation. The amount of wastewater generated by the backwashing of the ultrafiltration device is generally about 10% of the average water intake.

[0039] However, since the ultrafiltration backwash wastewater generated by the chemical softening and filtration process in the relevant technology will be returned to the raw water regulating tank for treatment, the amount of water that needs to be treated during softening and filtration treatment has increased by about 10%, which in turn has led to an increase in the consumption of various chemical agents by about 5% to 10%, thereby pushing up the cost of water treatment.

[0040] The problems solved by the present invention are described in detail below:

[0041] Refer to Figure 1 , which shows a softening and filtration treatment system provided by an embodiment of the present utility model, including:

[0042] Ultrafiltration device 1;

[0043] Ultrafiltration backwash water collection tank 2, the water inlet end of the ultrafiltration backwash water collection tank 2 is connected to the ultrafiltration backwash water outlet end of the ultrafiltration device 1;

[0044] Pipe mixer 3, the water inlet end of the pipe mixer 3 is connected to the water outlet end of the ultrafiltration backwash water collection tank 2;

[0045] First mechanical filtration device 4, the water inlet end of the first mechanical filtration device 4 is connected to the water outlet end of the pipe mixer 3.

[0046] Chemical softening is a link in the water treatment process. The purpose is to remove hardness ions in water through chemical reactions, mainly calcium ions and magnesium ions. Hardness ions can cause scaling problems in water pipes, boilers, heat exchangers, etc., reduce equipment efficiency, and increase maintenance costs. During the chemical softening treatment process, chemical reagents such as liquid caustic soda, lime, and sodium carbonate can be added to react with the hardness ions in water to form calcium carbonate and magnesium hydroxide precipitates, which are then separated by precipitation and filtered to soften the water quality.

[0047] Ultrafiltration refers to the use of a semi-permeable membrane in the ultrafiltration device to remove suspended solids, colloidal particles, bacteria, viruses, etc. in water. The pore size of the membrane is generally between 0.01 and 0.1 microns, allowing only water molecules and small molecule solutes to pass through, while retaining larger molecules and suspended substances on the membrane surface. Ultrafiltration is usually one of the processes for advanced water purification to ensure water quality safety.

[0048] Backwashing refers to the fact that after the membrane filtration or filter has been operating for a period of time, pollutants will accumulate on the surface, reducing the filtration efficiency. Backwashing is a corresponding cleaning process that reversely passes clean water or air through the filter medium to remove the impurities accumulated on the membrane surface or filter material. This process helps to restore the filtration performance and extend the service life of the equipment.

[0049] In the chemical softening and filtration treatment technology in the related art, the following technical route is generally adopted: raw water regulating tank → chemical softening sedimentation tank → mechanical filtration (such as multi-media filtration or V-shaped filter tank filtration) → ultrafiltration → ultrafiltration product water. Among them, the ultrafiltration backwash water returns to the raw water regulating tank. The ultrafiltration device needs to be backwashed frequently. Generally, it needs to be backwashed once every 30 minutes to 90 minutes of operation. The waste water generated by ultrafiltration backwashing is about 10% of the average influent water volume. Since the ultrafiltration backwash waste water in the existing chemical softening and filtration process needs to return to the raw water regulating tank for treatment, the amount of water to be treated in the chemical softening sedimentation process increases by about 10%, and then the consumption of various chemical agents increases by about 5% to 10%, which pushes up the water treatment cost.

[0050] Therefore, in the specific implementation, an ultrafiltration backwash water collection tank can be set to separately collect the ultrafiltration backwash water and the cross-flow filtration effluent, and the collected ultrafiltration backwash water is subjected to micro-flocculation treatment through a pipeline mixer. Micro-flocculation is a more refined flocculation process. The goal is to treat tiny or poorly flocculated suspended particles through a small dose of coagulant chemicals and transform them into particles that can be removed by filtration or sedimentation. Specifically, since the suspended solid content in the ultrafiltration backwash water is generally less than 30 mg / L and the required dosage of coagulant is generally less than 10 mg / L, a small amount of coagulant can be added to the pipeline mixer to achieve the micro-flocculation reaction. Further, the ultrafiltration backwash water subjected to micro-flocculation treatment through the pipeline mixer can be further filtered through a mechanical filtration device. The mechanical filtration device can be a multi-media filter filled with anthracite and / or quartz sand, or a V-shaped filter tank filled with quartz sand can also be selected.

[0051] Further, the ultrafiltration backwash water subjected to micro-flocculation treatment through the pipeline mixer and further filtered through the mechanical filtration device can be mixed with the process water after the original softening mechanical filtration and enter the ultrafiltration device for treatment together to jointly produce the product water of the water treatment process.

[0052] In an embodiment of the present utility model, the softening and filtration treatment system further includes:

[0053] A filtered water production tank 5, the water outlet end of the filtered water production tank 5 is connected to the water inlet end of the ultrafiltration device 1, and the water outlet end of the first mechanical filtration device 4 is connected to the water inlet end of the filtered water production tank 5;

[0054] An ultrafiltration product water tank 6, the product water inlet end of the ultrafiltration product water tank 6 is connected to the product water outlet end of the ultrafiltration device 1.

[0055] In practical applications, the process water after passing through steps such as the raw water regulating tank → chemical softening sedimentation tank → mechanical filtration will enter the ultrafiltration device for ultrafiltration treatment. Specifically, before entering the ultrafiltration device, the above-mentioned process water can first enter the filtered water production tank for temporary storage. The ultrafiltration backwash water after micro-flocculation treatment through a pipeline mixer and further filtration treatment through a mechanical filtration device can also be mixed with the above-mentioned process water and enter the filtered water production tank together for unified treatment by the ultrafiltration device.

[0056] Furthermore, after the water output from the filtered water production tank is pumped to the ultrafiltration device, when it is determined that the turbidity of the ultrafiltration produced water is reduced to less than 1 NTU (Nephelometric Turbidity Units), the produced water of the ultrafiltration device can be sent to the ultrafiltration produced water tank, and the ultrafiltration produced water can be provided outward as product water through a pump. Among them, turbidity is an important parameter for water quality detection, reflecting the amount of suspended particulate matter in the water body and affecting the transparency of the water. The turbidity unit NTU is the light scattering measurement result of a turbidimeter. A higher turbidity value means more suspended substances in the water body. Usually, appropriate measures need to be taken to reduce the turbidity of the water to ensure water quality safety.

[0057] In an embodiment of the present utility model, the softening and filtration treatment system further includes:

[0058] A second mechanical filtration device 7, and the water outlet end of the second mechanical filtration device 7 is connected to the water inlet end of the filtered water production tank 5.

[0059] In specific implementation, before ultrafiltration treatment, the water to be treated can also be subjected to chemical softening precipitation and mechanical filtration treatment first. Specifically, a mechanical filtration device can be set to perform mechanical filtration treatment on the process water that has completed chemical softening precipitation treatment. The mechanical filtration device can be a multi-media filter filled with anthracite and / or quartz sand, or a V-shaped filter filled with quartz sand can also be selected. Furthermore, the process water after mechanical filtration treatment can be mixed with the ultrafiltration backwash water treated in the previous step and sent into the filtered water production tank for unified ultrafiltration treatment.

[0060] In an embodiment of the present utility model, the softening and filtration treatment system further includes:

[0061] A softening water production tank 8, and the water outlet end of the softening water production tank 8 is connected to the water inlet end of the second mechanical filtration device 7.

[0062] In practical applications, the process water generated in the chemical softening precipitation step can be sent into the softening water production tank for temporary storage and sent to the second mechanical filtration device for mechanical filtration treatment according to actual needs.

[0063] In an embodiment of the present utility model, the softening and filtration treatment system further includes a raw water regulating tank 9, and a softening device 10 is arranged between the water outlet end of the raw water regulating tank 9 and the water inlet end of the softened water production tank 8.

[0064] In a specific implementation, a softening device for softening and precipitating the water to be treated can be arranged between the raw water regulating tank for collecting the water to be treated and the softened water production tank. Specifically, the water to be treated collected by the raw water regulating tank can be sent into the softening device. It can be first sent into the first softening reaction tank in the softening device, and liquid caustic soda can be added to the first softening reaction tank. Also, the residence time of the water to be treated in the first softening reaction tank can be controlled to be about 10 to 20 minutes (i.e., the hydraulic retention time is controlled to be about 10 to 20 minutes) to ensure sufficient reaction.

[0065] In the water treatment project, the hydraulic retention time refers to the time that water stays in a certain reaction tank or treatment unit. This time is crucial for determining the full progress of the chemical reaction. Insufficient hydraulic retention time may lead to incomplete reaction, while too long hydraulic retention time may lead to reduced treatment efficiency. Therefore, the hydraulic retention time of different steps can be controlled.

[0066] Furthermore, the wastewater (i.e., the water to be treated) can be controlled to flow into the second softening reaction tank, and sodium carbonate and a coagulant can be added to the second softening reaction tank. Similarly, the residence time of the wastewater in the second softening reaction tank can be controlled to be about 10 to 20 minutes (i.e., the hydraulic retention time is controlled to be about 10 to 20 minutes). After the softening reaction, calcium and magnesium ions in the wastewater will respectively form calcium carbonate and magnesium hydroxide. At the same time, under the action of the coagulant, the precipitation products will aggregate into smaller coagulation flocs.

[0067] Furthermore, the wastewater can be sent into the flocculation tank and a flocculant can be added to the flocculation tank. The residence time of the wastewater in the flocculation tank can be controlled to be 15 to 30 minutes (i.e., the hydraulic retention time is controlled to be about 15 to 30 minutes) or so, so that the tiny flocs in the wastewater gradually aggregate into large flocs under the action of the flocculant. Subsequently, the wastewater after the reaction in the flocculation tank can be controlled to flow into the sedimentation tank. Inclined tube fillers can be arranged in the sedimentation tank. The inclined tube filler is a facility used in the sedimentation tank. It consists of a series of inclined pipes, usually arranged at a fixed angle. The inclined tube filler increases the sedimentation area of particles during the sedimentation process, enabling the fine flocs to sediment more effectively, accelerating the sedimentation of sludge and improving the water treatment efficiency.

[0068] Further, the residence time of the wastewater in the sedimentation tank can be controlled for about 1 to 2 hours (i.e., the hydraulic retention time is controlled for about 1 to 2 hours), so that the separation of mud and water is completed in the sedimentation tank. The sludge generated by precipitation can be collected and discharged through the mud hopper at the bottom of the tank. Further, the chemically softened precipitation product water discharged from the sedimentation tank can enter the softened water production tank after being treated in the pH adjustment tank, and the water discharged from the softened water production tank can be pumped and lifted into the second mechanical filtration device for subsequent filtration and ultrafiltration treatment processes.

[0069] In an embodiment of the present utility model, the softening device 10 includes:

[0070] A first softening reaction tank 11, the water inlet end of the first softening reaction tank 11 is connected to the water outlet end of the raw water adjustment tank 9, and the first softening reaction tank 11 is also connected to a liquid caustic soda dosing device 12.

[0071] In a specific implementation, the water to be treated collected by the raw water adjustment tank can be sent into the first softening reaction tank in the softening device, and liquid caustic soda can be added to the first softening reaction tank through the liquid caustic soda dosing device. It is also possible to control the residence time of the water to be treated in the first softening reaction tank for about 10 to 20 minutes to ensure sufficient reaction.

[0072] In an embodiment of the present utility model, the softening device 10 further includes:

[0073] A second softening reaction tank 13, the water inlet end of the second softening reaction tank 13 is connected to the water outlet end of the first softening reaction tank 11, and the second softening reaction tank 13 is also connected to a sodium carbonate dosing device 14 and a coagulant dosing device 15.

[0074] In practical applications, it is possible to control the wastewater discharged from the first softening reaction tank to flow into the second softening reaction tank, and sodium carbonate and a coagulant are respectively added to the second softening reaction tank through the sodium carbonate dosing device and the coagulant dosing device. Similarly, it is possible to control the residence time of the wastewater in the second softening reaction tank for about 10 to 20 minutes. After the softening reaction, calcium and magnesium ions in the wastewater will respectively form calcium carbonate and magnesium hydroxide, and at the same time, under the action of the coagulant, the precipitation products will aggregate into smaller coagulation flocs.

[0075] In an embodiment of the present utility model, the softening device 10 further includes:

[0076] A flocculation tank 16, the water inlet end of the flocculation tank 16 is connected to the water outlet end of the second softening reaction tank 13, and the flocculation tank 16 is also connected to a flocculant dosing device 17;

[0077] A sedimentation tank 18, the water inlet end of the sedimentation tank 18 is connected to the water outlet end of the flocculation tank 16.

[0078] In a specific implementation, the wastewater discharged from the second softening reaction tank can be fed into a flocculation tank, and a flocculant can be added to the flocculation tank through a flocculant dosing device. The residence time of the wastewater in the flocculation tank can be controlled for about 15 to 30 minutes, so that the tiny flocs in the wastewater gradually aggregate into large flocs under the action of the flocculant. Subsequently, the wastewater after the reaction in the flocculation tank can be controlled to flow into a sedimentation tank. Inclined tube fillers can be arranged in the sedimentation tank, and the residence time of the wastewater in the sedimentation tank can be controlled for about 1 to 2 hours to complete the separation of mud and water in the sedimentation tank. The separation of mud and water is a process in water treatment to separate the sediment (usually solid particles, chemical flocs, etc.) from the water. After the sedimentation process, the heavier solid particles sink to the bottom of the tank, and the clear water flows out from the upper part, realizing the separation of mud and water. The sludge generated by sedimentation can be collected and removed through the mud hopper at the bottom of the tank.

[0079] In an embodiment of the present utility model, the softening device 10 further includes:

[0080] A pH adjustment tank 19, the water outlet end of the pH adjustment tank 19 is connected to the water inlet end of the softening water production tank 8, the water inlet end of the pH adjustment tank 19 is connected to the water outlet end of the sedimentation tank 18, and the pH adjustment tank 19 is further connected to an acidic chemical dosing device 20.

[0081] In practical applications, the chemically softened precipitation product water discharged from the sedimentation tank can enter the softening water production tank after being treated in a pH (acidity and alkalinity) adjustment tank. Specifically, the adjustment of the pH can be achieved by adding acidic chemicals to the pH adjustment tank through the acidic chemical dosing device.

[0082] In an embodiment of the present utility model, the mechanical filtration device is a multi-media filter, and the multi-media filter is filled with at least one or more of anthracite and quartz sand.

[0083] In a specific implementation, the mechanical filtration device can be a multi-media filter filled with anthracite and / or quartz sand, or a V-shaped filter filled with quartz sand, which can be selected according to actual needs.

[0084] The present utility model provides a softening and filtration treatment system that can reduce the water treatment cost by saving chemicals. Taking the raw water quality of the factory: flow rate: 1000m 3 / h, pH value: 7 - 8, TDS (Total Dissolved Solids): 3000 mg / L, total hardness (calculated as calcium carbonate): 750 mg / L, suspended solids: 50 mg / L, effluent water quality standard: total hardness (calculated as calcium carbonate): 100 mg / L, suspended solids: 10 mg / L, suspended solids in the filtered product water less than 3 mg / L, turbidity of the ultrafiltration product water less than 1 NTU as an example. If following the traditional process, its process route is: raw water regulating tank → chemical softening precipitation → mechanical filtration (such as multi-media filtration or V-shaped filter tank filtration) → filtered product water tank → ultrafiltration → ultrafiltration product water. The ultrafiltration backwash water returns to the raw water regulating tank. When the raw water flow rate is 1000 m3 / h, due to the reflux of the ultrafiltration backwash water, the treated water volume in the chemical softening precipitation step increases to more than 1100 m3 / h. The dosage of liquid caustic soda (32% concentration) is 770 kg / h, the dosage of sodium carbonate is 176 kg / h, the dosage of sulfuric acid (93%) is 165 kg / h, and the dosage of coagulant is 110 kg / h.

[0085] When adopting the process route corresponding to the softening and filtration treatment system provided by the present utility model, its process route can be briefly described as: raw water regulating tank → chemical softening precipitation → second mechanical filtration device → filtered product water tank → ultrafiltration → ultrafiltration product water; the ultrafiltration backwash water is collected and treated separately, ultrafiltration backwash water → ultrafiltration backwash water collection tank → first mechanical filtration device → filtered product water tank. The treated ultrafiltration backwash water will be mixed with the product water of the second mechanical filtration device in the filtered product water tank and enter the subsequent ultrafiltration device together. Under the same condition that the raw water flow rate is 1000 m3 / h, due to the separate collection and treatment of the ultrafiltration backwash water, the treated water volume in the chemical softening precipitation step is still about 1000 m3 / h, but the dosage of liquid caustic soda (32%) will be reduced to 700 kg / h, the dosage of sodium carbonate will be reduced to 160 kg / h, the dosage of sulfuric acid (93%) will be reduced to 150 kg / h, and the dosage of coagulant will be reduced to 100 kg / h;

[0086] It can be seen that the dosage of various chemicals is saved by about 10%. Calculated based on 8000 hours of annual operation, the annual savings of liquid caustic soda (32%) will reach 560 tons per year, the savings of sodium carbonate will reach 128 tons per year, the savings of sulfuric acid (93%) will reach 120 tons per year, and the savings of coagulant will reach 80 tons per year. The technical route provided by the present utility model can not only meet the water treatment technical requirements of the device, but also reduce the usage amount of various chemical agents by about 10%, thereby effectively reducing the water treatment cost.

[0087] Each embodiment in this specification is described in a progressive manner. Each embodiment focuses on the differences from other embodiments. The same or similar parts among the embodiments can be referred to each other.

[0088] Finally, it should also be noted that in this text, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, commodity or device comprising a series of elements not only includes those elements, but also includes other elements not expressly listed, or further includes elements inherent to such process, method, commodity or device. Without more limitations, an element defined by the statement "comprising an..." does not exclude the presence of additional identical elements in the process, method, commodity or device comprising the said element.

[0089] The above has introduced in detail a softening and filtering treatment system provided by the present utility model. Specific examples are used in this text to elaborate on the principle and implementation manner of the present utility model. The description of the above embodiments is only used to help understand the method and its core idea of the present utility model; at the same time, for those of ordinary skill in the art, according to the idea of the present utility model, there will be changes in the specific implementation manner and application scope. In summary, the content of this specification should not be construed as a limitation to the present utility model.

Claims

1. A softening and filtering treatment system, characterized in that: include: Ultrafiltration device (1); An ultrafiltration backwash water collection tank (2), wherein a water inlet of the ultrafiltration backwash water collection tank (2) is connected to a water outlet of the ultrafiltration backwash water of the ultrafiltration device (1); A pipeline mixer (3), wherein the water inlet end of the pipeline mixer (3) is connected to the water outlet end of the ultrafiltration backwash water collection tank (2); A first mechanical filtering device (4), wherein a water inlet end of the first mechanical filtering device (4) is connected to a water outlet end of the pipeline mixer (3).

2. The softening and filtering treatment system according to claim 1, characterized in that: The softening and filtering treatment system also includes: A filtering water production pool (5), wherein the water outlet of the filtering water production pool (5) is connected to the water inlet of the ultrafiltration device (1), and the water outlet of the first mechanical filtering device (4) is connected to the water inlet of the filtering water production pool (5); An ultrafiltration water production pool (6), wherein the product water inlet of the ultrafiltration water production pool (6) is connected to the product water outlet of the ultrafiltration device (1).

3. The softening and filtering treatment system according to claim 2, characterized in that: The softening and filtering treatment system also includes: A second mechanical filtering device (7), wherein the water outlet of the second mechanical filtering device (7) is connected to the water inlet of the filtering water production pool (5).

4. The softening and filtering treatment system according to claim 3, characterized in that: The softening and filtering treatment system also includes: A softening water production pool (8), wherein the water outlet of the softening water production pool (8) is connected to the water inlet of the second mechanical filtering device (7).

5. The softening and filtering treatment system according to claim 4, characterized in that: The softening and filtering treatment system further comprises a raw water regulating tank (9), and a softening device (10) is arranged between the water outlet end of the raw water regulating tank (9) and the water inlet end of the softening water production tank (8).

6. The softening and filtering treatment system according to claim 5, characterized in that: The softening device (10) comprises: A first softening reaction tank (11), wherein the water inlet of the first softening reaction tank (11) is connected to the water outlet of the raw water regulating tank (9), and the first softening reaction tank (11) is also connected to a liquid alkali dosing device (12).

7. The softening and filtering treatment system according to claim 6, characterized in that: The softening device (10) further comprises: A second softening reaction tank (13), wherein the water inlet end of the second softening reaction tank (13) is connected to the water outlet end of the first softening reaction tank (11), and the second softening reaction tank (13) is also connected to a sodium carbonate dosing device (14) and a coagulant dosing device (15).

8. The softening and filtering treatment system according to claim 7, characterized in that: The softening device (10) further comprises: A flocculation tank (16), wherein the water inlet end of the flocculation tank (16) is connected to the water outlet end of the second softening reaction tank (13), and the flocculation tank (16) is also connected to a flocculant delivery device (17); A sedimentation tank (18), wherein the water inlet end of the sedimentation tank (18) is connected to the water outlet end of the flocculation tank (16).

9. The softening and filtering treatment system according to claim 8, characterized in that: The softening device (10) further comprises: A pH adjustment tank (19), wherein the water outlet of the pH adjustment tank (19) is connected to the water inlet of the softening water production tank (8), the water inlet of the pH adjustment tank (19) is connected to the water outlet of the sedimentation tank (18), and the pH adjustment tank (19) is also connected to an acidic agent delivery device (20).

10. The softening and filtering treatment system according to any one of claims 1 to 9, characterized in that: The mechanical filtering device is a multi-media filter, and the multi-media filter is filled with at least one or more of anthracite and quartz sand.

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