An integrated system for treating sludge water in cold regions

Abstract

The present invention discloses an integrated system for treating sludge water in cold regions, comprising: a regulating tank, an air flotation concentration tank, a sludge storage tank, a sludge dewatering room, an air dissolving device, a turbidity meter and a control unit; the water outlet of the regulating tank is connected to the water inlet of the air flotation concentration tank; the sludge outlet of the air flotation concentration tank is connected to the sludge inlet of the sludge storage tank; the sludge outlet of the sludge storage tank is connected to the sludge inlet of the sludge dewatering room; the air outlet of the air dissolving device is first connected to the water outlet of the regulating tank and then connected to the water inlet of the air flotation concentration tank; the turbidity meter is arranged in the regulating tank; the control unit is respectively connected to the turbidity meter and the air dissolving device for communication, and the control unit can control the opening and closing of the air dissolving device according to the detection value of the turbidity meter. In this scheme, the operation process of the air flotation concentration tank is controlled according to the detection value of the turbidity meter, so that the air flotation concentration tank is switched to the operation mode corresponding to the water quality, which not only improves the sludge concentration efficiency, but also saves the system operation cost.

Description

Technical Field

[0001] The invention relates to the technical field of muddy water treatment, and in particular to an integrated muddy water treatment system suitable for cold regions. Background Art

[0002] The surface water in northern my country is covered with ice for 4-5 months a year, with water temperature below 10℃ and turbidity below 10NTU, forming the typical low-temperature and low-turbidity water quality in northern China, which has many adverse effects on water treatment, especially the coagulation stage. Because the water supply sludge water has strong hydrophilicity, the sludge must reach a certain concentration to achieve a good dehydration effect. When the sedimentation tank of the water treatment plant uses a sludge scraper to discharge sludge, the water content of the sludge water is generally about 99.25% to 99%, and the water content of the sludge inlet of the sludge dewatering machine is generally required to be no more than 97%, so the solid concentration of the sludge water in the sedimentation tank needs to be concentrated to 3% in the sludge water concentration tank. Since the water source water in the northern region is low-turbidity and high-chroma water, there is very little sludge generated by turbidity in the sludge produced by its production wastewater, and most of it is sludge generated by flocculants in the water treatment process. In the past, the conventional practice was to use gravity concentration to concentrate the sludge, but the sludge concentration effect was not good.

[0003] In order to overcome the above problems, after further exploration, the sludge can be concentrated by flotation, which of course has achieved certain expected results. However, the flotation concentration method sometimes encounters high turbidity of sludge water, which can be concentrated by self-precipitation. If flotation concentration is still used blindly, it will not only reduce the sludge concentration efficiency, but also increase the equipment operation cost. Summary of the invention

[0004] In view of this, the present invention provides an integrated system for sludge water treatment in cold areas, which can control the operation process of the flotation thickening tank according to the detection value of the turbidity meter, so as to switch the flotation thickening tank to an operation mode corresponding to the water quality, thereby helping to realize the intelligent control of the operation mode of the flotation thickening tank, which not only improves the sludge thickening efficiency, but also saves system operating costs.

[0005] To achieve the above object, the present invention provides the following technical solutions:

[0006] An integrated system for treating sludge water in cold regions, comprising: a regulating tank, an air flotation concentration tank, a sludge storage tank, a sludge dewatering room, an air dissolving device, a turbidity meter and a control unit;

[0007] The water outlet of the regulating tank is connected to the water inlet of the flotation concentration tank; the mud outlet of the flotation concentration tank is connected to the mud inlet of the sludge storage tank; the mud outlet of the sludge storage tank is connected to the mud inlet of the sludge dewatering room; the air outlet of the air dissolving device is first connected to the water outlet of the regulating tank and then connected to the water inlet of the flotation concentration tank;

[0008] The turbidity meter is arranged in the regulating tank; the control unit is respectively connected to the turbidity meter and the gas dissolving device for communication, and the control unit can control the opening and closing of the gas dissolving device according to the detection value of the turbidity meter.

[0009] Preferably, the gas dissolving device comprises: an air compressor, a compressed air cutting device and a gas-liquid mixed dissolving device;

[0010] The air outlet of the air compressor is connected to the air inlet of the compressed air cutting device; the water inlet of the gas-liquid mixed dissolution device is connected to the water outlet of the regulating tank, the air inlet is connected to the air outlet of the compressed air cutting device, and the water outlet is connected to the water inlet of the air flotation concentration tank;

[0011] The air compressor is communicatively connected with the control unit, and the control unit can control the opening and closing of the air compressor according to the detection value of the turbidity meter.

[0012] Preferably, the gas dissolving device further comprises a gas flotation valve;

[0013] The air inlet of the air flotation valve is connected to the air outlet of the air compressor, the air outlet is connected to the air inlet of the compressed air cutting device, and the air flotation valve is communicatively connected to the control unit, and the control unit can control the on and off of the air flotation valve according to the detection value of the turbidity meter.

[0014] Preferably, the compressed air cutting device comprises a tube body and a microporous plate;

[0015] The air inlet of the tube body is connected to the air outlet of the air compressor, and the air outlet is connected to the air inlet of the gas-liquid mixing and dissolving device; the microporous plate is arranged in the tube body and is used to cut the compressed air entering the tube body into fine bubbles.

[0016] Preferably, the gas-liquid mixed dissolution device includes a gas adding device.

[0017] Preferably, it further comprises: a flocculation and stirring device arranged in the regulating tank.

[0018] Preferably, it also includes a ceramsite preparation room and sludge transfer equipment;

[0019] The sludge transfer device is used to transfer the dehydrated sludge in the sludge dehydration room to the ceramsite preparation room, so as to serve as the main raw material for ceramsite preparation in the ceramsite preparation room.

[0020] Preferably, the sludge dewatering room comprises a centrifugal dewatering machine;

[0021] The ceramsite preparation room includes a ceramsite roasting furnace;

[0022] The sludge transfer device is arranged between the sludge dewatering room and the ceramsite preparation room, and one end of the sludge transfer device is connected to the sludge outlet of the centrifugal dewatering machine, and the other end of the sludge transfer device is connected to the feed inlet of the ceramsite roasting furnace.

[0023] Preferably, the sludge transfer equipment comprises a screw conveyor.

[0024] Preferably, the air flotation concentration tank comprises: an air flotation concentration tank body, a central guide tube, a scraper plate, a sludge scraper plate, a sludge collecting bucket and a driving mechanism;

[0025] The central guide tube is arranged in the flotation concentration tank body, and the air outlet of the gas dissolving device is first connected to the water outlet of the regulating tank and then connected to the bottom water inlet of the central guide tube; the scraper plate can be rotatable around the central guide tube and arranged at the top of the flotation concentration tank body, and is flush with the preset liquid level of the flotation concentration tank body; a slag collecting trough is provided on the top of the flotation concentration tank body, and the slag outlet of the slag collecting trough is connected to the first sludge inlet of the sludge storage tank; the sludge scraper can be rotatable around the central guide tube and arranged at the bottom of the flotation concentration tank body; the sludge collecting hopper is arranged at the bottom of the flotation concentration tank body, and the sludge outlet of the sludge collecting hopper is connected to the second sludge inlet of the sludge storage tank; the driving mechanism is used to drive the rotation of the scraper plate and the sludge scraper respectively.

[0026] It can be seen from the above technical scheme that in the integrated system for sludge water treatment in cold areas provided by the present invention, the operating process of the flotation thickening tank is controlled according to the detection value of the turbidity meter, so that the flotation thickening tank is switched to an operating mode corresponding to the water quality, thereby helping to realize the intelligent control of the operating mode of the flotation thickening tank, which not only improves the sludge thickening efficiency, but also saves system operating costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0028] Figure 1A schematic diagram of the structure of an integrated system for treating sludge water in cold regions provided by an embodiment of the present invention;

[0029] Figure 2 A schematic diagram of the structure of an air flotation concentration tank provided in an embodiment of the present invention;

[0030] Figure 3 A process flow chart of an integrated system for treating sludge water in cold regions provided in an embodiment of the present invention.

[0031] Among them, 1 is an air compressor, 2 is a compressed air cutting device, 3 is a booster pump, 4 is a gas-liquid mixing and dissolving device, 5 is a water inlet pipe, 6 is a retaining cylinder, 7 is a scraper plate, 8 is a sludge scraper, 9 is a slag collecting tank, 10 is a slag discharge pipe, 11 is a sludge discharge pipe, 12 is a sludge collecting bucket, 13 is a water outlet trough, 14 is a water outlet pipe, 15 is a dosing device, 16 is a water supply pump, 17 is a sludge storage tank, 18 is a sludge dewatering room, 19 is a ceramsite preparation room, 20 is a regulating tank, 21 is a flocculation and stirring device, 22 is a flotation valve, 23 is a reuse water tank, 24 is a sludge transfer equipment, 25 is an air flotation thickening tank, 28 is a turbidity meter, 29 is a control unit, 30 is an air flotation thickening tank body, and 31 is a central guide cylinder. DETAILED DESCRIPTION

[0032] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0033] The embodiment of the present invention provides an integrated system for treating sludge water in cold regions, such as Figure 1 As shown, it includes: a regulating tank 20, an air flotation concentration tank 25, a sludge storage tank 17, a sludge dewatering room 18, an air dissolving device, a turbidity meter 28 and a control unit 29;

[0034] The water outlet of the regulating tank 20 is connected to the water inlet of the flotation concentration tank 25; the mud outlet of the flotation concentration tank 25 is connected to the mud inlet of the sludge storage tank 17; the mud outlet of the sludge storage tank 17 is connected to the mud inlet of the sludge dewatering room 18; the air outlet of the dissolved gas device is first connected to the water outlet of the regulating tank 20 and then connected to the water inlet of the flotation concentration tank 25, so as to form dissolved gas water;

[0035] The turbidity meter 28 is arranged in the regulating tank 20 ; the control unit 29 is respectively connected to the turbidity meter 28 and the dissolved gas device for communication, and the control unit 29 can control the opening and closing of the dissolved gas device according to the detection value of the turbidity meter 28 .

[0036] It should be noted that the flotation concentration tank 25 in this solution has the dual functions of flotation and sedimentation. Among them, the tiny bubbles generated by the gas dissolving device quickly adhere to the suspended matter in the effluent of the regulating tank 20, lifting it to the top of the flotation concentration tank 25, thereby forming a sludge floating layer that is easy to remove, and then the sludge is removed by the scraper, while the heavier solid matter settles to the bottom of the flotation concentration tank 25 by its own gravity, and then the sludge is collected into the sludge collecting bucket by the sludge scraper, and then discharged through the sludge discharge pipe. Details can be seen in the following description. Of course, if Figure 1 As shown, the present solution further comprises a pressure pump 3 for providing conveying power for the muddy water.

[0037] In addition, this solution controls the start and stop of the dissolved air device according to the detection value of the turbidity meter 28, that is, according to the concentration of the suspended solids in the inlet water of the regulating tank 20, so as to achieve the effect of controlling the operation mode (operation process) of the flotation concentration tank 25. Among them, when the detection value of the turbidity meter 28 is less than the preset value, the dissolved air device is controlled to be turned on, so that the flotation concentration tank 25 enters the flotation concentration process (including both the flotation process and the sedimentation process); when the detection value of the turbidity meter 28 is greater than or equal to the preset value, the dissolved air device is controlled to be closed, so that the flotation concentration tank 25 enters the sedimentation concentration process (including only the sedimentation process). In other words, this solution adopts different treatment processes according to different water qualities through process switching, thereby realizing the intelligent control of the operation mode of the flotation concentration tank 25. In addition, this solution combines sedimentation with flotation technology to give full play to their respective advantages, which not only improves the treatment effect, but also saves investment and operating costs.

[0038] It can be seen from the above technical solutions that in the integrated system for sludge water treatment in cold areas provided by the embodiment of the present invention, the operating process of the flotation thickening tank is controlled according to the detection value of the turbidity meter, so that the flotation thickening tank is switched to an operating mode corresponding to the water quality, thereby helping to realize the intelligent control of the operating mode of the flotation thickening tank, which not only improves the sludge thickening efficiency, but also saves system operating costs.

[0039] Specifically, Figure 1 As shown, the gas dissolving device comprises: an air compressor 1, a compressed air cutting device 2 and a gas-liquid mixing and dissolving device 4;

[0040] The air outlet of the air compressor 1 is connected to the air inlet of the compressed air cutting device 2; the water inlet of the gas-liquid mixing and dissolving device 4 is connected to the water outlet of the regulating tank 20, the air inlet is connected to the air outlet of the compressed air cutting device 2, and the water outlet is connected to the water inlet of the air flotation concentration tank 25;

[0041] The air compressor 1 is connected to the control unit 29 for communication, and the control unit 29 can control the opening and closing of the air compressor 1 according to the detection value of the turbidity meter 28. In this scheme, the air dissolving device adopts the air dissolving tube air dissolving mechanism. First, the compressed air is cut into fine bubbles by the compressed air cutting device 2, and then the fine bubbles are mixed and dissolved with the sludge water through the disturbance of the gas-liquid mixing and dissolving device 4, so that the tiny bubbles are quickly attached to the suspended matter and lifted to the top of the flotation concentration tank 25, thereby forming a sludge floating layer that is easy to remove, and the heavier solid matter is precipitated at the bottom of the tank and is also removed. In this way, the flotation concentration tank 25 in this scheme is an air flotation concentration tank that adopts the air dissolving tube air dissolving mechanism. Compared with the existing pressurized dissolved air flotation method using a dissolved air tank, this scheme avoids the problem of clogging of the filler of the flotation tank and the problem of controlling the water level in the dissolved air tank. That is to say, this scheme adopts the air dissolving tube instead of the dissolved air tank, and also avoids the clogging problem of the diffuser from the source.

[0042] In addition, based on the design of the above-mentioned dissolved air pipe structure, the mud water and dissolved air water can be fully mixed in a section of the pipe before being added to the flotation concentration tank 25, and the bubbles are promptly and evenly dispersed in the suspended particles, thereby helping to improve the flotation concentration effect.

[0043] Furthermore, if Figure 1 As shown, the air dissolving device further includes an air flotation valve 22;

[0044] The air inlet of the air flotation valve 22 is connected to the air outlet of the air compressor 1, and the air outlet is connected to the air inlet of the compressed air cutting device 2, and the air flotation valve 22 is connected to the control unit 29 for communication, and the control unit 29 can control the on-off of the air flotation valve 22 according to the detection value of the turbidity meter 28. This scheme is designed in this way, that is, the opening and closing of the air compressor 1 is controlled by the on-off of the valve, and has the characteristics of simple control structure, easy design and implementation, etc.

[0045] Further, the compressed air cutting device 2 includes a tube body and a microporous plate;

[0046] The air inlet of the tube body is connected to the air outlet of the air compressor 1, and the air outlet is connected to the air inlet of the gas-liquid mixing and dissolving device 4; the microporous plate is arranged in the tube body, and is used to cut the compressed air entering the tube body into micro bubbles. In this scheme, the compressed air generated by the air compressor 1 is first cut into micro bubbles by using the microporous plate with special structure, and then mixed and dissolved with the mud water under very violent disturbance through the gas-liquid mixing and dissolving device 4. At this time, the air exists in two forms in the dissolved air pipe, one form is dissolved in water, and the other form is that the micro bubbles are enclosed and mixed in water in a free state; during flotation, this kind of bubble is directly used for flotation, and as the main source of bubbles, the micro bubbles released from the dissolved air water are also added to the flotation process zone. The number of micro bubbles formed by these two ways is far greater than the number of the existing dissolved air tank plus dissolved air releaser structure, which is also the essential difference between this scheme and the existing dissolved air structure, and this is also the reason why the dissolved air pipe structure of this scheme does not need to add a dissolved air releaser. Of course, the present invention can also cut the compressed air into fine bubbles by a high-speed rotating mixer.

[0047] Specifically, in order to achieve a better mixed dissolution effect of the sludge water and the fine bubbles, preferably, the gas-liquid mixed dissolution device 4 includes an aerating device.

[0048] The aeration device includes a Venturi nozzle and a micro-bubble generating device. First, air is introduced into the water under pressure through an air compressor to form an air supersaturation state, and then the Venturi nozzle is used to accelerate the gas-containing water flow, and a multi-layer mesh plate is set in the pipeline to cut the bubbles, expand and release the pressure, and finally form micro-bubble water, and then the dissolved gas water is sent to the flotation tank to reduce the pressure, so that the air is precipitated and released into the water as tiny bubbles to achieve flotation. This method forms small bubbles, about 20-100um, and has a good turbidity removal effect.

[0049] Furthermore, in order to enhance the flocculation reaction of the sludge water in the regulating tank 20, so as to improve the sludge concentration performance of the low-temperature and low-turbidity sludge water; accordingly, Figure 1 As shown, the integrated system for treating sludge water in cold regions provided by the embodiment of the present invention further includes: a flocculation and stirring device 21 arranged in the regulating tank 20 .

[0050] Furthermore, in order to realize the resource application of dewatered sludge, so as to achieve the effect of resource utilization of waste; and, considering that the main components of dewatered sludge are very close to the main components of clay, dewatered sludge has the potential to be used as the main raw material for preparing ceramsite; accordingly, the integrated system for sludge water treatment in cold regions provided by the embodiment of the present invention also includes a ceramsite preparation room 19 and a sludge transfer device 24;

[0051] The sludge transfer equipment 24 is used to transfer the sludge dehydrated in the sludge dehydration room 18 to the ceramsite preparation room 19 , so as to serve as the main raw material for ceramsite preparation in the ceramsite preparation room 19 .

[0052] In this scheme, if Figure 1 As shown, the sludge dewatering room 18 includes a centrifugal dewatering machine 27;

[0053] The ceramsite preparation room 19 includes a ceramsite roasting furnace 26;

[0054] The sludge transfer device 24 is arranged between the sludge dewatering room 18 and the ceramsite preparation room 19, and one end is connected to the sludge outlet of the centrifugal dewatering machine 27, and the other end is connected to the feed inlet of the ceramsite roasting furnace 26. The present solution is designed in this way, which simplifies the transfer structure of the dewatered sludge and helps to realize the convenient transfer of the dewatered sludge.

[0055] Specifically, the sludge transfer equipment 24 includes a screw conveyor, which has the characteristics of simple structure, reliable operation, and easy maintenance and management.

[0056] In this scheme, if Figure 1 and Figure 2 As shown, the air flotation concentration tank 25 includes: an air flotation concentration tank body 30, a central guide tube 31, a scraper plate 7, a sludge scraper 8, a sludge collecting bucket 12 and a driving mechanism;

[0057] The central guide tube 31 is arranged in the flotation concentration tank body 30, and the air outlet of the dissolved gas device is first connected to the water outlet of the regulating tank 20 and then connected to the bottom water inlet of the central guide tube 31; the scraper plate 7 can rotate around the central guide tube 31 and is arranged at the top of the flotation concentration tank body 30, and is flush with the preset liquid level of the flotation concentration tank body 30; a slag collecting trough 9 is provided on the top of the flotation concentration tank body 30, and the slag outlet of the slag collecting trough 9 is connected to the first mud inlet of the sludge storage tank 17; the sludge scraper 8 can rotate around the central guide tube 31 and is arranged at the bottom of the flotation concentration tank body 30; the mud collecting bucket 12 is arranged at the bottom of the flotation concentration tank body 30, and the mud outlet of the mud collecting bucket 12 is connected to the second mud inlet of the sludge storage tank 17; the driving mechanism is used to drive the scraper plate 7 and the sludge scraper 8 to rotate respectively. In this scheme, the scum on the top of the flotation concentration tank 25 is scraped to the slag collecting tank 9 by the scraper 7, and then discharged to the sludge storage tank 17 through the slag discharge pipe 10; and the sediment (sludge) at the bottom of the flotation concentration tank 25 is scraped to the sludge collecting bucket 12 by the sludge scraper, and then enters the sludge storage tank 17 through the sludge discharge pipe. Of course, the tiny bubbles carrying suspended matter enter the flotation concentration tank body 30 from the top of the central guide tube 31.

[0058] The present invention is further described below in conjunction with specific embodiments:

[0059] The present invention provides an integrated system for treating sludge water in cold regions, such as Figure 3As shown, the process flow is as follows: the backwash wastewater and sedimentation tank drainage first enter the regulating tank 20, and after being stirred by the flocculation stirring device 21, enter the flotation concentration tank 25. After flotation concentration, the effluent is disinfected by adding drugs, reacted in the reuse water tank 23, and then sent to the power plant user by the water delivery pump 16. The scum of the flotation concentration tank 25 is scraped to the slag collecting tank 9 by the scraper plate 7, and then discharged to the sludge storage tank 17 through the slag discharge pipe 10. The sludge precipitated in the flotation concentration tank 25 is collected by the sludge discharge bucket (i.e., the sludge collection bucket 12), and enters the sludge storage tank 17 through the sludge discharge pipe. The sludge and sludge are mixed and enter the sludge dewatering room 18. The sludge is dehydrated by the centrifugal dehydrator 27 to reduce the moisture content of the sludge to 80%, and then sent to the ceramsite preparation room 19 by the screw conveyor, and fired into ceramsite by the ceramsite roasting furnace 26 for external transportation. Among them, whether the flotation concentration tank adopts the flotation process or the sedimentation process is based on the SS monitor (i.e., the turbidity meter 28) in the regulating tank 20, and the start and stop of the air compressor system are controlled by the electronic control unit (i.e., the control unit 29). In order to avoid frequent opening of the valve, a manual control system can also be used.

[0060] This process adopts flotation concentration. The flotation concentration tank is designed as a circular reinforced concrete tank, equipped with surface and bottom scraper systems. The surface scraper system includes a scraper 7, and the bottom scraper system has a bottom sludge scraper 8. The bottom and surface scrapers are driven by a drive system. The surface scraper is equipped with a roller running along the track at one end, and there is a peripheral aisle on the tank.

[0061] This scheme adopts the dissolved air pipe mechanism, using a microporous plate to first cut the compressed air from the air compressor 1 into fine bubbles, and then pass through the aerating device to mix and dissolve with the pressurized water under very violent disturbance, forming tiny bubbles, which quickly attach to the suspended matter and lift it to the surface of the flotation tank, thereby forming a sludge floating layer that is easy to remove. The heavier solid matter settles at the bottom of the tank and is also removed. The rotating scraper plate 7 scrapes the scum to the slag collecting tank 9, and then enters the slag discharge pipe 10. Some particles with relatively large relative density will settle to the bottom of the tank, and the sludge scraper 8 at the bottom of the tank can also scrape the settled sludge out of the slag chamber. A sludge collecting bucket 12 and a sludge discharge pipe 11 are set at the bottom of the tank, and the central rotating part is set with a sludge scraping mechanism on the side and bottom of the tank, which can ensure that the sediment in the tank is regularly removed without any impact on the water outlet. The treated effluent falls through the triangular weir plate, flows to the annular outlet trough for collection and then is discharged; wherein, the effluent overflow weir plate arranged in the flotation tank of this scheme is a triangular weir plate, in order to make its effluent effect better when switching to sedimentation.

[0062] The moisture content of the sludge after concentration is less than 98.5%.

[0063] The mechanical dehydration in this scheme adopts centrifugal dehydration method to reduce the moisture content of sludge to 80%.

[0064] In addition, the central flow guide tube may include a mixing chamber, the lower end of which is connected to the dissolved air pipe. The central flow guide tube may also include a gradually expanding baffle tube, the upper end of which is a trumpet-shaped opening, and the lower end of which is connected to the upper end of the mixing chamber, and the microbubbles carrying the suspended matter enter the flotation device from the upper part of the gradually expanding baffle tube. The arrangement of the baffle tube allows the microbubbles carrying the suspended matter to be buffered to a certain extent in the baffle tube, avoiding excessive interference to the surrounding water. The central flow guide tube may also include a dissolved air water inlet pipe, which is connected to the mixing chamber below the mixing chamber, and the dissolved air water enters the mixing chamber through the dissolved air water inlet pipe.

[0065] At present, ceramsite is mainly clay ceramsite, and most of the raw materials come from the land, which is undoubtedly a damage to the soil environment. In recent years, my country has imposed restrictions on clay products, so the raw materials for ceramsite have also been restricted.

[0066] Water supply sludge is mainly produced after surface water is treated, so its main components are very close to the main components of clay. Therefore, it is very easy to combine it with clay. As a mixed material, the composition, moisture content and other characteristics of water supply sludge are used to prepare expanded clay with water supply sludge as the main material and bentonite as the auxiliary material for resource application.

[0067] The sludge dehydrated to 80% is used as the main raw material, and bentonite is used as the auxiliary raw material to prepare expanded clay. The raw material ratio is 70%:30% (water supply sludge with a moisture content of 80%: bentonite). The expanded clay calcined at a temperature of 1000°C can be used as an adsorption material for sewage treatment, achieving the effect of treating waste with waste.

[0068] This process is an integrated technology for treating low-temperature and low-turbidity sludge water in cold regions, which can reduce the volume of sludge water, render it harmless and recycle it as a resource.

[0069] Beneficial effects of this program:

[0070] 1. Through the switching of multifunctional and efficient flotation pools, different treatment processes can be adopted according to different water qualities, with flexible application and intelligent management and control. Specifically, when the SS of the inlet water reaches 200, the air compressor is started to adopt the flotation process; when the SS of the inlet water reaches 600, the air compressor is turned off and the sedimentation process is adopted. The flotation and sedimentation processes are switched by controlling the opening of the air compressor through the numerical value of SS. Sedimentation and flotation can also be switched according to different seasons or different inlet water parameters. The way to achieve this is that the pool itself has the dual functions of flotation and sedimentation. Among them, the tiny bubbles formed by flotation quickly attach to the suspended matter and lift it to the surface of the flotation pool. Thus, a sludge floating layer that is easy to remove is formed, and the scum is removed by the scraper, while the heavier solid matter settles to the bottom of the pool by its own gravity, and then the sludge is collected into the mud collecting bucket by the scraper and discharged through the mud discharge pipe.

[0071] 2. Compared with the existing pressurized dissolved air flotation method using a dissolved air tube, this scheme does not have the problem of filler clogging, nor the problem of controlling the water level in the dissolved air tank, because it treats the "symptoms" while also treating the "root cause". (The air has been finely divided before dissolving). The original muddy water and dissolved air water have been fully mixed in a section of the pipeline before being added to the main body of the flotation tank, and the bubbles are promptly and evenly dispersed in the suspended particles, avoiding the uneven bubble phenomenon caused by the different opening degrees of multiple valves or dissolved air releasers. In addition, compared with the existing pressurized dissolved air flotation method using a dissolved air tube, this scheme also omits the clean water return system, including the return pump, return water tank, etc., saving water and reducing energy consumption.

[0072] 3. The implementation method of the dissolved air tube mechanism of this scheme is to use a special structure microporous plate to first cut the compressed air into fine bubbles,44 and then mix and dissolve it with pressurized water under very violent disturbance. At this time, the air exists in two forms in the dissolved air tube, one form is dissolved in water, and the other form is fine bubbles enclosed and mixed in water in a free state; during flotation, this kind of bubbles are directly used for flotation, and as the main source of bubbles, the fine bubbles released from the dissolved air water are also added to the flotation process. The number of fine bubbles formed by these two ways is much larger than the number of the structure of the dissolved air tank plus the dissolved air releaser. This is also the essential difference between the two dissolved air structures, and it is also the reason why the dissolved air tube structure does not need to add a dissolved air releaser.

[0073] 4. In view of the characteristics of sludge water in cold areas, the sludge has high viscosity, poor sedimentation and difficulty in dehydration. The flocculated sludge water is injected into the mixing chamber at the bottom of the flotation tank, where it comes into contact with the gas-saturated water flowing through the pressure relief valve, forming small bubbles attached to the solid particles.

[0074] 5. Since the sedimentation method has been used for many years in the water purification process, the dissolved air flotation method is suitable for light and floating impurities; the sedimentation method is suitable for dense and heavy impurities. Usually, the flocs formed by dosing and mixing reaction, when the floating speed is faster than the sedimentation, the flotation method is better. Because the flotation method occupies a small area and the pool volume is also small, the water quality of the treated water is good, not only the turbidity and SS are low, but also the dissolved oxygen is high, and the water content of the discharged scum is much lower than the sludge discharged by the sedimentation method. The general sludge volume ratio is 1 / 10-1 / 2, which brings great convenience to the further treatment and disposal of the sludge and saves costs.

[0075] Innovations of this solution:

[0076] 1. Dual-function high-efficiency flotation tank: A new type of multifunctional high-efficiency flotation tank is used, which can switch between sedimentation and flotation according to different seasons or different water inlet parameters. This type of tank has the dual functions of flotation and sedimentation. When flotation is used: the tiny bubbles formed by flotation quickly attach to the suspended matter and lift it to the surface of the flotation tank, thus forming a sludge floating layer that is easy to remove, and then the sludge floating layer is removed by the scraper; when sedimentation is used: the slag is removed by the scraper, and the heavier solid matter settles to the bottom of the tank by its own gravity, and the sludge is collected in the sludge collecting bucket by the scraper and discharged through the sludge discharge pipe.

[0077] 2. Intelligent control system: The most advanced intelligent control system is adopted. The intelligent control platform of "regulating tank + flotation concentration tank + sludge storage tank + dissolved air device + turbidity meter" is used to realize the intelligent control of the operation mode of the flotation tank. The control platform software follows the established logic algorithm. For example, when the inlet SS reaches 200, the air compressor is started to adopt the flotation process; when the inlet SS reaches the set value (such as 600), the air compressor and the dissolved air reflux system are turned off, and the sedimentation process is adopted. The air compressor is controlled to switch the flotation and sedimentation processes through the SS value. Therefore, by collecting the parameters of the inlet and operation in real time, trend analysis and expert intelligent prejudgment and post-feedback methods are carried out to reasonably determine how to realize the switching of the operation mode and the intelligent adjustment of the operation parameters. The control platform software adopts the currently popular common language, which can be connected to the automation control system of the entire water treatment plant or run independently.

[0078] 3. Unique air-dissolving tube release structure: The air-dissolving mechanism of the air-dissolving tube is adopted, and the microporous plate with special structure is used to cut the compressed air into fine bubbles first, and then mix and dissolve with pressurized water under very violent disturbance. At this time, the air exists in two forms in the air-dissolving tube, one form is dissolved in water, and the other form is fine bubbles enclosed and mixed in water in a free state. During flotation, this kind of bubble is directly used for flotation, and as the main source of bubbles, the fine bubbles released from the dissolved water are also added to the flotation process. The number of fine bubbles formed by these two ways is far greater than the number of the structure of the air-dissolving tank plus the dissolved air releaser. This is also the essential difference between the two air-dissolving structures, and it is also the reason why the air-dissolving tube structure does not need to add a dissolved air releaser. Compared with the existing pressurized dissolved air flotation method using a dissolved air tank, this scheme does not have the problem of filler clogging, nor the problem of controlling the water level in the tank, because it treats the "symptoms" while also treating the "root cause". (The air has been micronized before dissolving). Before the raw water and dissolved air water are added to the main body of the flotation tank, they have been fully mixed in a section of the pipeline, and the bubbles are dispersed in the suspended particles in a timely and uniform manner. The uneven bubble phenomenon caused by the different opening degrees of multiple valves or dissolved air releasers is avoided. Compared with the existing pressurized dissolved air flotation method using dissolved air tanks, this scheme omits the return system of clean water, including the return pump, return water tank, etc., saving water and reducing energy consumption.

[0079] 4. Unique single factor control method: This scheme uses turbidity as the only parameter for control operation. Its principle is simple. Combined with the different working conditions of water plant inlet, it uses a high-precision turbidity analyzer (online) to achieve closed-loop control. It can easily measure the turbidity of sludge water in the production process water and realize intelligent control. Whether it is evaluating activated sludge and the entire biological treatment process, analyzing the wastewater discharged after purification treatment, or monitoring the sludge concentration at different stages, it can give continuous and accurate measurement results without color interference. And it can automatically compensate for the interference caused by the color change of activated sludge due to flow changes, annual climate fluctuations or other reasons. Unlike traditional systems that constantly require color compensation, the turbidity analyzer used requires "measurement value stability" and "measurement value repeatability" to be faster and more reliable, and requires the automatic cleaning system of the analyzer probe to prevent erroneous readings caused by bubbles and sludge particles. The turbidity analyzer can also be connected to the world's advanced equipment controllers, such as Hach's SC1000 digital universal controller.

[0080] 5. It has the advantages of efficient removal and resource utilization: Through efficient flotation, various inorganic particles, organic matter and precursors to color formation in the sludge water of the water treatment plant are separated from the water. It has better concentration effect than traditional gravity sedimentation, and increases the removal capacity of organic matter and precursors to color formation. The scum formed can be used as a dephosphorizer and adsorbent for water environment management after dehydration and burning, realizing the resource utilization of waste, responding to the call of the country, and matching the requirements of the circular economy.

[0081] Protection points of this scheme:

[0082] This process is an integrated technology for treating low-temperature and low-turbidity sludge water in cold regions, which can reduce the volume of sludge water, render it harmless and recycle it as a resource.

[0083] For reservoir water in northern regions, due to the low temperature, low turbidity and algae-containing muddy water characteristics of raw water, the conventional treatment method of gravity concentration treatment is not effective, the scum cannot sink, and the water content requirement of 97% cannot be met. The flotation tank process can overcome the problem of ineffective concentration and further dehydration treatment can be carried out.

[0084] Flotation tanks are used in water treatment plants and sewage treatment processes, but they are not used in the low-temperature, low-turbidity sludge water treatment process of northern water treatment plants. The present invention innovatively applies the flotation tank to the low-temperature, low-turbidity sludge water treatment process of water treatment plants, uses intelligent management and control to control the operation of the flotation concentration tank, and uses the flotation concentration tank with a dissolved air tube dissolved air mechanism, avoiding the blockage problem of the traditional flotation tank dissolved air tank filler and the air releaser blockage problem.

[0085] Resource utilization of waste. The main components of water supply sludge are very close to the main components of clay, so it is very easy to combine it with clay as a mixture. The sludge is used as the main raw material for preparing ceramsite after sludge concentration and mechanical dehydration. The drainage sludge can be used for the preparation of ceramsite filter material and meets various indicators. Utilizing the composition, moisture content and other characteristics of water supply sludge, water supply sludge is used as the main material and bentonite is used as the auxiliary material for resource utilization to prepare ceramsite, and the sewage is adsorbed. The raw material ratio of ceramsite with the best ammonia nitrogen adsorption effect and the roasting temperature are adjusted. The optimal roasting temperature and raw material ratio are used to achieve the best effect of removing ammonia nitrogen from wastewater.

[0086] In addition, this solution aims to solve the problem of unsatisfactory treatment of low-temperature and low-turbidity sludge water, and uses flotation tank for concentration. The resource utilization of dehydrated sludge can apply the prepared ceramsite to sewage treatment to adsorb and remove pollutants.

[0087] Water supply sludge is used for sewage treatment. It can remove phosphorus in sewage with good results. Sludge formed by adding aluminum salt coagulant is used to treat pollutants in wastewater. Experiments show that in sewage treatment, the addition of aluminum-containing sludge has a very obvious effect on the treatment of COD in water, and as the stirring speed increases, the COD removal rate increases accordingly. This process is mainly physical adsorption.

[0088] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0089] The above description of the disclosed embodiments enables one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. An integrated system for treating sludge water in cold regions, characterized in that: include: A regulating tank (20), an air flotation concentration tank (25), a sludge storage tank (17), a sludge dewatering room (18), an air dissolving device, a turbidity meter (28) and a control unit (29); The water outlet of the regulating tank (20) is connected to the water inlet of the flotation concentration tank (25); the mud outlet of the flotation concentration tank (25) is connected to the mud inlet of the sludge storage tank (17); the mud outlet of the sludge storage tank (17) is connected to the mud inlet of the sludge dewatering room (18); the air outlet of the air dissolving device is first connected to the water outlet of the regulating tank (20) and then connected to the water inlet of the flotation concentration tank (25); The turbidity meter (28) is arranged in the regulating tank (20); the control unit (29) is respectively connected to the turbidity meter (28) and the gas dissolving device for communication, and the control unit (29) can control the opening and closing of the gas dissolving device according to the detection value of the turbidity meter (28); The gas dissolving device comprises: an air compressor (1), a compressed air cutting device (2) and a gas-liquid mixing and dissolving device (4); The air outlet of the air compressor (1) is connected to the air inlet of the compressed air cutting device (2); the water inlet of the gas-liquid mixing and dissolving device (4) is connected to the water outlet of the regulating tank (20), the air inlet is connected to the air outlet of the compressed air cutting device (2), and the water outlet is connected to the water inlet of the air flotation concentration tank (25); The air compressor (1) is communicatively connected to the control unit (29), and the control unit (29) is capable of controlling the opening and closing of the air compressor (1) according to the detection value of the turbidity meter (28); The gas dissolving device further comprises a gas flotation valve (22); The air inlet of the air flotation valve (22) is connected to the air outlet of the air compressor (1), and the air outlet is connected to the air inlet of the compressed air cutting device (2), and the air flotation valve (22) is communicatively connected to the control unit (29), and the control unit (29) can control the on and off of the air flotation valve (22) according to the detection value of the turbidity meter (28); The integrated sludge water treatment system suitable for cold regions further comprises: a flocculation and stirring device (21) arranged in the regulating tank (20).

2. The integrated system for treating sludge water in cold regions according to claim 1 is characterized in that: The compressed air cutting device (2) comprises a tube body and a microporous plate; The air inlet of the tube body is connected to the air outlet of the air compressor (1), and the air outlet is connected to the air inlet of the gas-liquid mixing and dissolving device (4); the microporous plate is arranged in the tube body and is used to cut the compressed air entering the tube body into fine bubbles.

3. The integrated system for treating sludge water in cold regions according to claim 1 is characterized in that: The gas-liquid mixed dissolution device (4) comprises a gas adding device.

4. The integrated system for treating sludge water in cold regions according to claim 1 is characterized in that: Also included is a ceramsite preparation room (19) and sludge transfer equipment (24); The sludge transfer equipment (24) is used to transfer the dehydrated sludge in the sludge dehydration room (18) to the ceramsite preparation room (19), so as to serve as the main raw material for ceramsite preparation in the ceramsite preparation room (19).

5. The integrated system for treating sludge water in cold regions according to claim 4 is characterized in that: The sludge dewatering room (18) comprises a centrifugal dewatering machine (27); The ceramsite preparation room (19) includes a ceramsite roasting furnace (26); The sludge transfer device (24) is arranged between the sludge dewatering room (18) and the ceramsite preparation room (19), and one end of the sludge transfer device is connected to the sludge outlet of the centrifugal dewatering machine (27), and the other end of the sludge transfer device is connected to the feed inlet of the ceramsite roasting furnace (26).

6. The integrated system for treating sludge water in cold regions according to claim 4 is characterized in that: The sludge transfer equipment (24) comprises a screw conveyor.

7. The integrated system for treating sludge water in cold regions according to claim 1 is characterized in that: The air flotation concentration tank (25) comprises: an air flotation concentration tank body (30), a central guide tube (31), a scraper plate (7), a sludge scraper (8), a sludge collecting bucket (12) and a driving mechanism; The central guide tube (31) is arranged in the flotation concentration tank body (30); the gas outlet of the gas dissolving device is first connected to the water outlet of the regulating tank (20) and then connected to the bottom water inlet of the central guide tube (31); the scraper plate (7) can rotate around the central guide tube (31) and is arranged on the top of the flotation concentration tank body (30) and is flush with the preset liquid level of the flotation concentration tank body (30); the top of the flotation concentration tank body (30) is provided with a slag collecting groove (9); The slag outlet of the slag collecting trough (9) is connected to the first sludge inlet of the sludge storage tank (17); the sludge scraper (8) is rotatable around the central guide tube (31) and is arranged at the bottom of the air flotation concentration tank body (30); the sludge collecting hopper (12) is arranged at the bottom of the air flotation concentration tank body (30), and the sludge outlet of the sludge collecting hopper (12) is connected to the second sludge inlet of the sludge storage tank (17); the driving mechanism is used to drive the slag scraper (7) and the sludge scraper (8) to rotate respectively.

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