CN112744950A

CN112744950A - River water purification, softening and desalination treatment system

Info

Publication number: CN112744950A
Application number: CN202011496296.2A
Authority: CN
Inventors: 刘海英; 殷莉莉
Original assignee: Shanghai Cang Lang Yuan Water Treatment Engineering Co ltd
Current assignee: Shanghai Cang Lang Yuan Water Treatment Engineering Co ltd
Priority date: 2020-12-17
Filing date: 2020-12-17
Publication date: 2021-05-04

Abstract

The application relates to a river water purification, softening and desalination treatment system, which comprises a water purification module, a softening module and a desalination module, wherein the water purification module, the softening module and the desalination module are used for sequentially treating water; the water purification module comprises a first dosing device, a pre-sedimentation tank, a filtering device, a disinfecting device and a water purification tank, wherein the first dosing device is used for dosing water and then discharging the water into the pre-sedimentation tank, clear water in the pre-sedimentation tank is introduced into the filtering device and is discharged into the water purification tank after being treated by the disinfecting device; the softening module comprises a multi-media filter, a softener, a third dosing device and a softening water tank, wherein the third dosing device is used for dosing water introduced into the multi-media filter; the desalination module comprises a reverse osmosis water supply pump, a cartridge filter, a high-pressure pump, a reverse osmosis device and a water production tank, wherein water flows through the reverse osmosis water supply pump, the cartridge filter, the high-pressure pump, the reverse osmosis device and the water production tank in sequence; the water in the water purifying tank, the water softening tank and the water producing tank is fed to each water consumption point. This application is with taking convenient river as industrial process water, to the water rational distribution use, saves manufacturing cost.

Description

River water purification, softening and desalination treatment system

Technical Field

The application relates to the technical field of water purification treatment, in particular to a river water purification, softening and desalination treatment system.

Background

Water is one of important raw materials for industrial production, and the water consumption in industrial production is large. Tap water is used as industrial production water, so that domestic water resources are increasingly tense, and the industrial production cost of enterprises is increased due to higher cost of the tap water.

The factory with the geographical position close to river water takes the river water as a water source, and the produced water after purification treatment can meet the requirements of industrial production water, and as the industrial production water, the factory can reduce the industrial production cost and relieve the pressure of domestic water.

Disclosure of Invention

In order to save the industrial production cost and relieve the pressure of domestic water, the application provides a river water purification, softening, desalination processing system.

The application provides a river water purifies, softens, desalination processing system adopts following technical scheme:

a river water purification, softening and desalination treatment system comprises a water purification module, a softening module and a desalination module which are used for sequentially treating water; the water purification module comprises a first dosing device, a pre-settling tank, a filtering device, a disinfecting device and a water purification tank, water is introduced into the pre-settling tank, the first dosing device pumps water to a water taking pump to add a medicament into the water in the pre-settling tank, the water subjected to precipitation treatment in the pre-settling tank is introduced into the filtering device for filtering treatment, and filtered water is discharged into the water purification tank after being treated by the disinfecting device; the softening module comprises a multi-media filter, a softener, a third dosing device and a softening water tank, water in the purified water tank is pumped into the multi-media filter through a water pump, the third dosing device pumps water which is pumped into the multi-media filter through the water pump to be added with a medicament, water produced by the multi-media filter is sent into the softener to be softened, and the softened water is discharged into the softening water tank; the desalination module comprises a reverse osmosis water supply pump, a cartridge filter, a high-pressure pump, a reverse osmosis device, a pH adjusting device and a water production tank, wherein the reverse osmosis water supply pump pumps water in the softened water tank and sends the water to the cartridge filter for filtration treatment, the pH adjusting device is used for adjusting the pH value of the water pumped by the reverse osmosis water supply pump to the cartridge filter, the water produced by the cartridge filter is pumped to the reverse osmosis device through the high-pressure pump, and the deionized water produced by the reverse osmosis device is sent to the water production tank; the water in the water purifying tank, the water softening tank and the water producing tank can be sent to each water using point through a water pump.

By adopting the technical scheme, the river water is respectively generated into purified water in the purified water tank, softened water in the softened water tank and deionized water in the water production tank after being processed by the river water purification, softening and desalination processing system, and the purified water, the softened water and the deionized water can be used for different water consumption points of industrial production, so that the purposes of reasonably distributing and using the water, saving the cost and relieving the pressure of the domestic water are achieved.

The river water is subjected to impurity removal, filtration and disinfection treatment by the water purification module to generate industrial water, sludge generated by the water purification module is subjected to recycling of water resources by the sludge treatment module, and the sludge is treated to generate sludge cakes; the river water purification, softening and desalination treatment system is convenient to take and use by using the river water purification treatment as industrial production water, saves the industrial production cost and reduces the pollution to the environment in the purification treatment process.

Preferably, the system also comprises a sludge treatment module for treating the sludge generated in the water purification module; the sludge treatment module comprises a sludge tank and a filter press, sludge generated in the pre-settling tank and the filtering device is discharged into the sludge tank, the sludge in the sludge tank is discharged into the filter press for dehydration treatment, the generated wastewater flows back to the sludge tank, and supernatant in the sludge tank is discharged into the water purification module for treatment.

By adopting the technical scheme, the sludge generated by the water purification module realizes the recycling of water resources through the sludge treatment module, and the sludge generates sludge cakes after being treated, thereby reducing the pollution to the environment in the purification treatment process.

Preferably, the sludge treatment module further comprises a sludge stirring tank and a second dosing device, the sludge tank discharges sludge into the sludge stirring tank through a sludge pump, the second dosing device adds a medicament into the sludge stirring tank, the sludge stirring tank stirs the sludge and the medicament, sewage generated in the sludge stirring tank flows back to the sludge tank, and the sludge in the sludge stirring tank is discharged into the filter press through the screw pump for dehydration treatment.

Through adopting above-mentioned technical scheme, the second charge device is arranged in throwing PAM coagulant aid in the mud of pumping to the sludge pump, further accelerates the coagulation of mud. The sludge stirring tank is used for further concentrating the sludge, more supernatant in the sludge stirring tank can conveniently flow back to the sludge pool, and the subsequent box-type filter press can conveniently dehydrate the sludge.

Preferably, the filter press is a chamber filter press.

By adopting the technical scheme, the box-type filter press ensures the dehydration treatment of the sludge.

Preferably, the water purification system further comprises a water intake pump station, and a water intake pump in the water intake pump station pumps water to the pre-sedimentation tank.

Through adopting above-mentioned technical scheme, the water intaking pump in the water intaking pump station can stably extract the water source to in the preliminary sedimentation pond, and then carries out subsequent processing to the water source, and water can regard as industrial water after purifying.

Preferably, a pipeline mixer is communicated with the water taking pump and the pre-settling tank in the water taking pump station, and the agent added into the pipeline by the first agent adding device is uniformly mixed with water through the pipeline mixer.

Through adopting above-mentioned technical scheme, the pipe-line mixer mainly used is with the liquid medicine and the intake intensive mixing homogeneous that first charge device released, and guarantees the intraductal velocity of flow of pipe-line mixer.

Preferably, the first dosing device is used for dosing through a metering pump, the first dosing device is of a two-pump two-box structure, and the two metering pumps are used and standby one by one.

Through adopting above-mentioned technical scheme to in first charge device can add medicine continuously and stably, detach the large granule and the suspended substance in the former aquatic.

Preferably, the filtering device is a full-automatic water purifier, and the full-automatic water purifier can automatically perform back washing.

By adopting the technical scheme, the full-automatic water purifier integrates flocculation, sedimentation, pollution discharge, back flushing and water collection and filtration, and has an automatic sludge discharge function. The full-automatic water purifier does not need manual management, and has good treatment effect and excellent effluent quality.

Preferably, the number of the full-automatic water purifiers is two, and one of the two full-automatic water purifiers is used for standby or used simultaneously.

Through adopting above-mentioned technical scheme, the setting of two full-automatic water purifiers improves water purification efficiency.

Preferably, the purified water tank, the softening water tank and the water production tank are provided with three water supply pumps for supplying water to water using points, and the water supply pumps are used for one water supply.

Through adopting above-mentioned technical scheme, be provided with reserve working shaft, when taking place the working shaft and damaging, can stably send into water to each water and electricity through switching working shaft.

In summary, the present application includes at least one of the following beneficial technical effects:

the river water is subjected to impurity removal, filtration and disinfection treatment by the water purification module to generate industrial water, sludge generated by the water purification module is subjected to recycling of water resources by the sludge treatment module, and the sludge is treated to generate sludge cakes; the river water purification, softening and desalination treatment system is convenient to take and use by using the river water for industrial production water, saves the industrial production cost and reduces the pollution to the environment in the purification treatment process;

the full-automatic water purifier integrates flocculation, sedimentation, pollution discharge, back flushing and water collection and filtration, and has an automatic sludge discharge function. The full-automatic water purifier does not need manual management, has good treatment effect and excellent effluent quality;

the second dosing device is used for adding PAM coagulant aid into the sludge pumped by the sludge pump, so that the coagulation of the sludge is further accelerated. The sludge stirring tank is used for further concentrating the sludge, so that the supernatant at the top of the sludge stirring tank can conveniently flow back to the sludge pool, and the subsequent box-type filter press can conveniently dehydrate the sludge.

Drawings

FIG. 1 is a system block diagram of a river water purification, softening and desalination treatment system according to an embodiment of the present application;

FIG. 2 is a schematic view of a piping structure of a purification module in an embodiment of the present application;

FIG. 3 is a schematic diagram of a water purification module;

fig. 4 is a schematic structural view of the water purifier;

FIG. 5 is a schematic cross-sectional view taken along the line A-A in FIG. 4;

fig. 6 is a schematic view of a filter structure of the water purifier;

FIG. 7 is a schematic view of the structure of a sludge treatment module;

FIG. 8 is a schematic view of the piping structure of the softening module and the desalting module in the embodiment of the present application.

Description of reference numerals: 1. a water taking pump station; 2. a pipeline mixer; 3. a first dosing device; 4. a preliminary sedimentation tank; 5. a full-automatic water purifier; 6. a water purifying tank; 7. a sterilizing device; 8. a sludge tank; 9. a sludge pump; 10. a sludge stirring tank; 11. a second dosing device; 12. a box type filter press; 13. a multi-media filter; 14. a softener; 15. softening the water tank; 16. a reverse osmosis water supply pump; 17. a cartridge filter; 18. a high pressure pump; 19. a reverse osmosis unit; 20. a water production tank; 21. a third dosing device; 22. a pH adjusting device.

Detailed Description

The present application is described in further detail below with reference to fig. 1.

The embodiment of the application discloses a river water purification, softening and desalination treatment system. As shown in fig. 1, the river water purification, softening and desalination treatment system comprises a water purification module, a softening module, a desalination module and a sludge treatment module. The water source is processed by the water purification module to form purified water meeting the water use requirement, and the purified water can meet part of industrial production requirements; purified water is introduced into a softening module for treatment to form softened water meeting the water use requirement, and the softened water can be used for most industrial production requirements; softened water is introduced into a desalting module for treatment to form deionized water meeting the water use requirement, and the deionized water can meet the industrial production requirement of higher water quality; sludge generated in water purification of the water purification module is discharged into the sludge treatment module, the sludge treatment module dehydrates the sludge, generated sewage is discharged into the water purification module for water purification, and the dehydrated sludge is treated in a unified way.

In the embodiment, the raw water is river water, and the water source meets the II-class standard of GB3838-88 ground water environment quality standard and meets the requirement of GB5749-85 sanitary standard for drinking water of national regulation.

As shown in fig. 1, the water purification module comprises a water intake pump station 1, a first chemical adding device 3, a pipeline mixer 2, a pre-sedimentation tank 4, a filtering device, a sterilizing device 7 and a water purification tank 6. Wherein, in water intaking pump station 1 water intaking pump extraction inflow river water in the river collecting well to the preliminary sedimentation pond 4, through pipeline mixer 2 when the water source promotes, first charge device 3 puts into the medicament in to the pipeline, and the medicament gets into preliminary sedimentation pond 4 with the raw water after pipeline mixer 2 misce bene, and the water source gets into. The supernatant of the pre-sedimentation tank 4 flows into a filtering device, the filtered water enters a water purifying tank 6 after being disinfected, and the water in the water purifying tank 6 is conveyed to a water consumption point.

As shown in fig. 2 and 3, the first chemical adding device 3 is used for adding PAC coagulant, PAM coagulant aid, and the like into the influent water to coagulate small particle suspended matters in the raw water into large particle flocs for settling and removing in the pre-settling tank 4. Wherein, first charge device 3 adopts the measuring pump to add the medicine, for two case structures of two pumps, two measuring pumps are one and are equipped with one to first charge device 3 can continuously add the medicine, gets rid of the tiny particle suspended solid in the former aquatic. The PAC coagulant adding point is arranged on a water outlet main pipe of the water taking pump.

As shown in fig. 2, the pipeline mixer 2 is mainly used for feeding water into the pre-settling tank 4, and the liquid medicine released by the first medicine adding device 3 is fully and uniformly mixed with the fed water. Wherein the flow velocity in the pipe of the pipeline mixer 2 is controlled to be 1-1.5m/s, and the feeding port of the medicament is arranged outside 0.3m in front of the water inlet.

As shown in fig. 2 and 3, the preliminary sedimentation tank 4 removes suspended substances from water by the effect of coagulating sedimentation of water. Wherein, the pre-settling tank 4 is arranged as a vertical flow type settling tank. Raw water is discharged into the tank from top to bottom through a water inlet pipe arranged at the center of the pre-settling tank 4, and an umbrella-shaped baffle is arranged below a water inlet outlet, so that the raw water is uniformly distributed in the tank and then slowly rises along the whole section of the tank. The suspended matters sink into the tapered sludge bucket at the bottom of the tank under the action of gravity, and the clarified water is discharged from an overflow weir around the upper end of the tank. The generated clarified water enters a water purifier for treatment, and the generated sludge is discharged into a sludge treatment module for treatment.

As shown in figure 4, the filtering device is a novel full-automatic water purifier 5, and the full-automatic water purifier 5 is suitable for the inlet water turbidity of less than or equal to 1000mg/L and the outlet water turbidity of less than or equal to 1-3 mg/L. The full-automatic water purifier 5 integrates flocculation, sedimentation, pollution discharge, back flushing and water collection and filtration, and automatically discharges mud. The full-automatic water purifier 5 has good treatment effect, good effluent quality, less water consumption, less power consumption, small occupied area, water saving, electricity saving and no need of manual management.

As shown in figures 4 and 5, one end of the full-automatic water purifier 5 is provided with water inlet, a perforated pipe for water distribution and a large plane reflection flow water distribution unit, so that the water distribution of the device is ensured to be uniform, water flow at each micropore is sprayed out at a certain flow velocity, a high-concentration suspension reflux layer reaction unit has the reaction height of about 1.5m, the precipitation of flocculated sludge is prevented, small alum flocs in raw water are fully contacted with the sludge for flocculation reaction, the small alum flocs are condensed into large alum flocs, and favorable conditions are created for inclined pipe sedimentation.

As shown in fig. 4 and 5, the fully automatic water purifier 5 is composed of an inclined tube diversion and backflow unit and a settling area, so that redundant sludge is quickly settled under the action of a high-concentration inclined tube accelerated settling and sludge collecting unit, and a unique 65-degree inclined tube settling structure and a suspended sludge backflow protection unit are adopted, so that the full automatic water purifier has a rectification function and has an effect of uniformly distributing water. The settling zone pipe chute sets up the pipe chute and subsides with higher speed according to the shallow layer theory of precipitating, and the lower part subsides the large granular floc that forms fast, because the rivers direction changes between two-layer pipe chute, will increase the contact chance between the small granule floc, when the upper pipe chute of flowing through, further improves quality of water, adopts the buckled plate to catchment in the clear water district of settling basin, makes the system catchment even.

As shown in fig. 5 and 6, since a part of suspended matters must exist in the collected water, a baffle and a scum groove are provided in the fully automatic water purifier 5, and scum is periodically discharged through an overflow port. One part of sludge in the sedimentation tank flows back to the flocculation reaction tank, and the rest part of sludge enters the sludge area and is discharged out periodically. The effluent of the clean water area is uniformly distributed to a distribution water tank through a water collecting tank, the leaked micro suspended matters are removed through filtering by a filter, and the effluent enters a reservoir through the clean water tank. The filter adopts a reflecting plate for water distribution, a porous plate for water collection, a filter material which is a quartz sand filter material, and a gravel bearing layer arranged below the filter material, and the back washing is automatic siphon back washing after reaching the rated head loss, and the back washing strength is adjustable. The operation and back flushing of the full-automatic water purifier 5 are realized by the filter material operation resistance arranged in the full-automatic water purifier 5 through siphon, and the stored water in the filter clean water tank is automatically carried out by a siphon pipe and an auxiliary pipe system.

In this embodiment, in order to achieve the optimum water purification effect, the number of the fully automatic water purifiers 5 is two. The full-automatic water purifier 5 is provided with a plurality of electric mud discharge valves for discharging the mud in the corresponding mud bucket in time, the mud discharge of the full-automatic water purifier 5 is carried out according to a set time program, and the mud discharge period can be set on site and manually adjusted according to the mud discharge requirement.

In order to achieve an optimal disinfection of the water, as shown in fig. 1, chlorine dioxide is used in the disinfection device 7 in this embodiment. Chlorine dioxide is a new generation of high-efficiency high-speed oxidative disinfectant, and can keep high sterilization efficiency in a wide pH value range. Compared with chlorine, the chlorine dioxide has good sterilization effect, small dosage and quick action. Chlorine dioxide can kill microorganisms, decompose residual cell structures, and play a role in killing spores and viruses, but does not react with organic matters in water to generate organic chlorine derivatives with carcinogenic effect like chlorine and sodium hypochlorite, and residual chlorine in water after use is little. Chlorine dioxide is currently used by the nation to treat drinking water. Meanwhile, disinfection modes of other principles can be adopted, for example, the disinfection device 7 can also use the UVC-LED lamp group to carry out ultraviolet sterilization and disinfection.

As shown in fig. 1, the fresh water tank 6 functions to store water. Since the water outlet of the full-automatic water purifier 5 is normal pressure, the water purifying tank 6 is used for ensuring the water consumption point of the instant water supply of the water consumption point of the later stage. The water purifying tank 6 is of a steel concrete structure, and the volume of the water tank can be set according to the water supply quantity of each water using point. In this embodiment, three water supply pumps are connected to the clean water tank 6, and the water supply pumps can be used for both purposes, so that stable water pumping can be performed for industrial production, and an energy-saving motor is arranged in each water supply pump.

In this embodiment, in order to ensure that the water yield in the pond can reach the demand in the use, can form a complete set high, well, low magnetism liquid level floater in water purification case 6 has the switching signal output for realize the linkage work of raw water elevator pump and water purification elevator pump and purified water liquid level, satisfy the operation requirement of pond water-logging.

As shown in fig. 1 and 7, the sludge is a product of the sewage purification treatment process, and is an important component of the whole treatment, and if the sludge is not properly treated and is discarded, secondary pollution is generated, so that the sludge must be treated, the water content of the sludge is reduced, the volume of the sludge is reduced, the property is stable, and the sludge can be safely disposed.

As shown in FIG. 7, the sludge treatment module comprises a sludge tank 8, a sludge pump 9, a second chemical adding device 11, a sludge stirring tank 10 and a box-type filter press 12. Wherein, the sludge produced in the pre-settling tank 4 and the full-automatic water purifier 5 is discharged into the sludge tank 8 through the pump body, the sludge and the water in the sludge tank 8 are separated due to the action of gravity, and the supernatant in the sludge tank 8 flows back to the pre-settling tank 4 through the pump body.

As shown in FIG. 7, the sludge in the sludge tank 8 is discharged to the sludge agitation tank 10 by the sludge pump 9. The second dosing device 11 is used for adding a PAM coagulant aid into the sludge pumped by the sludge pump 9, so that the sedimentation of the sludge is further accelerated. And after the sludge is concentrated by the sludge stirring tank 10, supernatant at the top of the sludge stirring tank 10 flows back to the sludge pool 8, the sludge at the bottom of the sludge stirring tank 10 is discharged into the box-type filter press 12 by the screw pump for sludge dehydration, and the supernatant obtained by the box-type filter press 12 flows back to the sludge pool 8. And (5) the pressed mud cakes are transported to municipal refuse landfill or landfill.

As shown in fig. 1 and 8, the softening module comprises a multi-media filter 13, a softener 14, a softening water tank 15 and a third dosing device 21, and the softening module can effectively reduce the hardness of water treated by the water purification module and provide softened water for users.

As shown in fig. 8, the water in the fresh water tank 6 is pumped to the multimedia filter 13 by the raw water pump. In this embodiment, the number of the raw water pumps is set to four, the raw water pumps are used for three purposes and one is provided, sufficient pressure is provided for a subsequent system, and the energy-saving motors are arranged in the raw water pumps.

As shown in fig. 8, the third chemical adding device 21 is used for adding a chemical into the water pumped by the raw water pump to the multimedia filter 13, and the third chemical adding device 21 comprises a PAC chemical adding device which is used for removing impurities such as particles, suspended matters and organic matters in the water by matching with the multimedia filter 13. In order to ensure the continuous dosing of the medicine into the water, the PAC doser adopts two pumps and two boxes, wherein one pump is used for standby.

As shown in fig. 8, the third drug adding device 21 further comprises a NaClO sterilization drug adding device, and the NaClO sterilization drug adding device is used for removing various bacteria in water. The NaClO sterilization doser is set to be two pumps and one box, the two pumps can be switched, one pump is used for standby, and the NaClO sterilization doser is convenient to use practically.

As shown in fig. 8, the multi-media filter 13 is an important pretreatment device, the multi-media filter 13 is used for filtering out impurities such as fine particles, suspended matters, colloids and organic matters in water, and the multi-media filter 13 is provided with a program start-stop device.

In the present embodiment, the multimedia filter 13 in the softening module is provided as three stand-up structured filters. The multi-media filter 13 can be operated independently or simultaneously. The water production pipe of the multi-media filter 13 is provided with sampling points, and the number and the positions of the samples can effectively diagnose and determine the defects of the system.

As shown in fig. 8, the softener 14 is used to reduce the hardness of water. The softener 14 comprises three sections, an ion exchange section, a salt regeneration section and a control section. Because the hardness of water mainly comprises calcium and magnesium ions, cation exchange resin is generally adopted to replace Ca2+ and Mg2+ (main components forming scale) in the water, and the effectiveness of the resin in removing Ca2+ and Mg2+ is gradually reduced along with the increase of Ca2+ and Mg2+ in the resin. Therefore, after the softener 14 is used for a period of time, the resin needs to be regenerated by salt, so that the efficiency of the resin is recovered, and the service life of the resin is prolonged. The control part can realize the automatic operation of the whole system, and the regeneration is automatically controlled according to the operation time of the system or through the water quantity.

The softener 14 removes scale forming ions such as calcium, magnesium and the like in water by an ion exchange principle to soften the water. The softener 14 is an integrated apparatus composed of a resin tank (softened resin), a salt tank, a controller, and the like.

Three vertical softeners 14 are selected in the softening module, and the automatic valves are controlled by a PLC (programmable logic controller), so that full automation of the processes of system operation, cleaning, regeneration and the like is realized.

As shown in fig. 8, the water produced by the softener 14 directly enters the softening water tank 15, and the softening water tank 15 in the softening module is of a carbon steel corrosion-resistant structure. The demineralization water tank 15 can store demineralization produced water to stabilize stable operation for the subsequent desalination module.

In order to guarantee the orderly operation of the softening module, a softening regeneration device can be added into the softening module, and the softening regeneration device dissolves a salt pool, a brine tank, a regeneration pump, a self-priming pump and a brine pump so as to guarantee the normal operation of the softener 14.

As shown in fig. 8, a water supply pump is connected to the softened water tank 15, and the water supply pump draws softened water for industrial production. Generally, three water supply pumps are arranged on the softening water tank 15, one water supply pump is used for two purposes, water can be stably pumped for industrial production, and an energy-saving motor is arranged in each water supply pump.

As shown in fig. 1 and 8, the desalination module includes a reverse osmosis water supply pump 16, a cartridge filter 17, a high pressure pump 18, a reverse osmosis device 19, a water production tank 20, and a PH adjusting device 22, and softened water is passed through the desalination module to generate deionized water.

As shown in fig. 8, the reverse osmosis water supply pump 16 pumps the softened water in the softened water tank 15 to the cartridge filter 17, and the reverse osmosis water supply pump 16 is used for providing sufficient water inlet pressure for the cartridge filter 17 to ensure the normal operation of the reverse osmosis device 19.

As shown in fig. 8, the PH adjusting device 22 is located between the reverse osmosis water supply pump 16 and the cartridge filter 17. Since CO2 has total permeability to reverse osmosis membranes, CO2 in the water is removed by PH adjusting device 22. The pH adjusting device 22 adds sodium hydroxide into the water, and aims to adjust the pH value of the water to 8-9 so as to convert CO2 into HCO 3-to be removed by the reverse osmosis system, thereby being beneficial to the reverse osmosis system to remove CO2, TOC, silicon and salt and improving the quality of produced water. In addition, the reverse osmosis system is operated under the condition of high pH value, so that the cleaning frequency of the reverse osmosis system can be reduced, and the consumption of chemicals and labor cost are saved. In the present embodiment, the PH adjusting device 22 is provided as two pumps and one tank.

As shown in fig. 8, the cartridge filter 17 functions to trap particles larger than 5 μ from the pre-treated effluent to prevent the particles from entering reverse osmosis and subsequent systems. Such particles, after being accelerated by the high pressure pump 18, may puncture the reverse osmosis membrane module, causing a large amount of salt leakage and scratching the impeller of the high pressure pump 18.

As shown in fig. 8, a high pressure pump 18 is located between the cartridge filter 17 and the reverse osmosis device 19, and the high pressure pump 18 is used for providing sufficient inlet water pressure for the reverse osmosis device 19 to ensure the normal operation of the reverse osmosis system.

As shown in fig. 8, the reverse osmosis device 19 employs the most advanced TFC type composite membrane in the world, the desalination rate of a single membrane reaches 99.5%, and the recovery rate of the reverse osmosis device 19 is designed to be 71%.

To ensure proper operation of the reverse osmosis unit 19, a cleaning unit may be added to the desalination module, which is capable of removing contaminants from the reverse osmosis membrane to restore the original properties of the reverse osmosis membrane. No matter how thorough the pretreatment is, the surface of the reverse osmosis membrane is polluted after long-term use. And when the reverse osmosis membrane assembly is polluted, chemically cleaning the reverse osmosis membrane.

In order to enable the system to automatically work, in the embodiment, a programmable control system PLC and a touch screen control system are adopted to automatically run, and a manual control mode and an automatic control mode are set; when the change-over switch is set in the manual working state, the system can be started and stopped by manual operation, and each working pump, electric or electromagnetic valve can realize single-step manual operation on each electric device.

When the change-over switch is set in an automatic working state, the system runs automatically according to the programs set by the PLC and the touch screen system through the PLC and the touch screen system. And providing a DCS communication interface (suitable for the DCS system interface condition adopted by the user) according to the specified requirement.

The PLC and the touch screen control cabinet are manufactured together with the instrument cabinet, a power supply of the control cabinet is led from a main engineering power distribution room, a set of power distribution screen is independently arranged and used for controlling the power consumption of the water purification room, and the power supply adopts a three-phase five-wire system 380V/50 HZ.

Wherein, each dosing device is internally provided with a liquid level switch, has low and ultra-low switching value signal output, is used for low liquid level alarm of each dosing metering pump, has the function of ultra-low liquid level pump stop, and is beneficial to protecting each metering pump.

The implementation principle of a river water purification, softening and desalination treatment system in the embodiment of the application is as follows:

river water is treated by adding chemicals in a pipeline, flows into the pre-settling tank 4 through the pipeline mixer 2, and enters the pre-settling tank 4 for settling. The supernatant of the pre-settling tank 4 flows into a full-automatic water purifier 5, after sedimentation and filtration by an inclined tube, the effluent enters a purified water tank 6 after being sterilized, and the water in the purified water tank 6 can be used for industrial production. The purified water is gradually treated by the multi-media filter 13 and the softener 14 in the softening module, the obtained softened water is discharged into the softening water tank 15, and the water in the softening water tank 15 can be used for most industrial production. The softened water is gradually treated by the cartridge filter 17 and the reverse osmosis device 19 in the desalination module, and the obtained deionized water is discharged into the water production tank 20, so that the deionized water can meet the requirement of industrial water with higher water quality. The purified water, the softened water and the deionized water are respectively used for different water consumption points in industrial production, so that the water is reasonably distributed and used, the cost is saved, and the pressure of domestic water is relieved.

And the sludge produced in the water purification module is discharged by an electric valve. Sludge generated by the pre-settling tank 4 and the full-automatic water purifier 5 is discharged into a sludge tank 8, sludge at the bottom of the sludge tank 8 is pumped out by a sludge pump 9 and enters a sludge stirring tank 10, supernatant in the sludge stirring tank 10 is pumped by a supernatant pump and discharged into the sludge tank 8, sludge is discharged into a box-type filter press 12 by a screw pump, the supernatant of the box-type filter press 12 flows back to the sludge tank 8, and the treated sludge is pressed into mud cakes and then transported outwards, so that pollution is reduced, and the water is recycled.

The above embodiments are preferred embodiments of the present application, and the protection scope of the present application is not limited by the above embodiments, so: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.

Claims

1. A river water purification, softening, desalination processing system which characterized in that: comprises a water purification module, a softening module and a desalination module which are used for sequentially treating water;

the water purification module comprises a first dosing device (3), a pre-settling tank (4), a filtering device, a disinfecting device (7) and a water purification tank (6), water is introduced into the pre-settling tank (4), the first dosing device (3) adds a medicament into the water pumped into the pre-settling tank (4) by a water pump, the water precipitated in the pre-settling tank (4) is introduced into the filtering device for filtering treatment, and filtered water is treated by the disinfecting device (7) and then discharged into the water purification tank (6);

the softening module comprises a multi-media filter (13), a softener (14), a third dosing device (21) and a softening water tank (15), water in the purified water tank (6) is pumped into the multi-media filter (13) through a water pump, the third dosing device (21) adds a medicament into the water pumped into the multi-media filter (13) through the water pump, water produced by the multi-media filter (13) is sent into the softener (14) for softening treatment, and the softened water is discharged into the softening water tank (15);

the desalination module comprises a reverse osmosis water supply pump (16), a security filter (17), a high pressure pump (18), a reverse osmosis device (19), a pH adjusting device (22) and a water production tank (20), wherein the reverse osmosis water supply pump (16) pumps water in a softened water tank (15) and sends the water to the security filter (17) for filtration treatment, the pH adjusting device (22) is used for adjusting the pH value of the water pumped to the security filter (17) by the reverse osmosis water supply pump (16), the water produced by the security filter (17) is pumped to the reverse osmosis device (19) by the high pressure pump (18), and the deionized water produced by the reverse osmosis device (19) is sent to the water production tank (20);

the water in the water purifying tank (6), the softening water tank (15) and the water producing tank (20) can be sent to each water using point through a water pump.

2. The river water purification, softening, desalination treatment system of claim 1, wherein: the device also comprises a sludge treatment module for treating the sludge generated in the water purification module;

the sludge treatment module comprises a sludge tank (8) and a filter press, sludge generated in the pre-settling tank (4) and the filter device is discharged into the sludge tank (8), sludge in the sludge tank (8) is discharged into the filter press for dehydration treatment, generated wastewater flows back to the sludge tank (8), and supernatant in the sludge tank (8) is discharged into the water purification module for treatment.

3. The river water purification, softening, desalination treatment system of claim 2, wherein: the sludge treatment module further comprises a sludge stirring tank (10) and a second dosing device (11), the sludge tank (8) discharges sludge into the sludge stirring tank (10) through a sludge pump (9), the second dosing device (11) adds a medicament into the sludge stirring tank (10), the sludge stirring tank (10) stirs sludge and the medicament, sewage generated in the sludge stirring tank (10) flows back to the sludge tank (8), and the sludge in the sludge stirring tank (10) is discharged into a filter press through a screw pump for dehydration treatment.

4. The river water purification, softening, desalination treatment system of claim 3, wherein: the filter press adopts a chamber type filter press (12).

5. The river water purification, softening, desalination treatment system of claim 1, wherein: the water purification system further comprises a water taking pump station (1), and a water taking pump in the water taking pump station (1) pumps water to the pre-sedimentation tank (4).

6. The river water purification, softening, desalination treatment system of claim 5, wherein: a water taking pump in the water taking pump station (1) is communicated with the pre-settling tank (4) to form a pipeline mixer (2), and the first medicine adding device (3) adds medicine into the pipeline to be uniformly mixed with water through the pipeline mixer (2).

7. The river water purification, softening, desalination treatment system of claim 1, wherein: the first dosing device (3) comprises a metering pump for quantitatively dosing, the first dosing device (3) is of a two-pump two-box structure, and the two metering pumps are used and standby.

8. The river water purification, softening, desalination treatment system of claim 1, wherein: the filter device is a full-automatic water purifier (5), and the full-automatic water purifier (5) can automatically perform backwashing.

9. The river water purification, softening, desalination treatment system of claim 8, wherein: the number of the full-automatic water purifiers (5) is two, and the two full-automatic water purifiers (5) are used one by one or used at the same time.

10. The river water purification, softening, desalination treatment system of claim 1, wherein: the water purifying tank (6), the softening water tank (15) and the water producing tank (20) are provided with three water supply pumps which send water to each water using point, and the water supply pumps are used for one water supply.