Pressure ceramic tubular membrane hardness and silicon removal integrated system

Abstract

The present invention relates to a pressure-type ceramic tubular membrane integrated system for removing hardness and silicon. The outlet of the pipeline mixer is connected to the water inlet A of the ceramic tubular membrane. The inner cavity of the ceramic tubular membrane treatment device is divided into a ceramic tubular membrane filtration area and a coagulation pre-sedimentation area by a partition. A water outlet B is arranged on the upper part of the coagulation pre-sedimentation area. The water outlet B is connected to the water inlet C on the upper part of the ceramic tubular membrane filtration area through a raw water pump. A water production port D is arranged on one side of the lower part of the ceramic tubular membrane filtration area. The water production port D is respectively connected to the water production pipeline and the water inlet H of the cleaning water tank. The cleaning water tank is provided with a water outlet I and a water outlet J. The water outlet J is connected to the water inlet C through a cleaning water pump. A sludge outlet G is arranged at the bottom of the coagulation pre-sedimentation area. The present invention adopts a modular design. The system integrates flocculation, sedimentation and filtration, has high flexibility and small footprint; the produced water quality is good, the dosage of the reagent is small, and the sludge output is low; the ceramic tubular membrane has high strength, friction resistance, and a long service life replacement cycle, which greatly reduces the cost of later maintenance and replacement.

Description

Technical Field

[0001] The invention belongs to the technical field of water treatment de-hardening and softening treatment devices, and specifically relates to a pressure-type ceramic tubular membrane integrated system for de-hardening and de-siliconizing. Background Art

[0002] In the treatment of industrial wastewater with high hardness and silicon content, the chemical softening method is the most mature and commonly used method. Its traditional process is: water to be treated → coagulant reaction tank → hardness removal agent coagulation reaction tank → flocculation reaction tank → sedimentation tank → effluent. Its process treatment has some disadvantages: the process treatment flow is long and the system chemical reaction time is long, which makes the tank volume larger, resulting in a large area occupied by the overall process; the water quality of the system effluent is unstable, and auxiliary agents such as amide need to be added for flocculation and precipitation reaction, which makes the cost of agent addition high; after adding amide and other flocculants, a large amount of precipitation will be produced in the sedimentation tank, and the amount of sludge will increase greatly, resulting in a significant increase in the subsequent sludge disposal fee. In recent years, organic tubular membrane hardness and silicon removal devices have been used to replace traditional treatment processes. The process flow is: water to be treated → coagulant reaction tank → hardness removal agent coagulation reaction tank → flocculation reaction tank → organic tubular membrane filtration → effluent. The organic tubular membrane used in this treatment process also has some disadvantages: in order to prevent pollutants from enriching on the membrane surface during operation and causing membrane clogging, it is necessary to form a cross-flow high-speed flushing on the membrane surface to prevent membrane clogging. High-speed cross-flow flushing makes most of the water pump energy consumption used in circulating cross-flow flushing, which requires a lot of energy consumption. The operating cost is greatly increased; a large amount of solid particles will be formed after the system is added with hardness and silicon removal chemical agents. Due to the cross-flow high-speed scouring on the membrane surface, the solid particles generated after adding the agent will cause wear on the surface of the organic membrane tube. Therefore, this process has relatively high requirements on the material strength of the membrane. Most of the membranes are imported from abroad, resulting in a high total investment cost for the system; the system has been running under this condition for a long time, and the solid particles have caused long-term wear on the surface of the membrane tube, reducing the water quality of the produced water, greatly reducing the service life of the membrane, and shortening the replacement cycle, resulting in a greatly increased system maintenance cost. Summary of the invention

[0003] In view of the shortcomings of the prior art, the purpose of the present invention is to provide an integrated pressure-type ceramic tubular membrane hardness and silicon removal system. The system adopts a modular design, and the system integrates flocculation, sedimentation, and filtration. It has high flexibility, small footprint, low energy consumption, good water quality, stable treatment effect, small amount of reagents, and low sludge production. It is equipped with an automatic membrane cleaning device to clean the system regularly, and the system has a long service life. The ceramic tubular membrane has high strength, friction resistance, acid and alkali resistance, long service life, and long replacement cycle, which greatly reduces the cost of later maintenance and replacement.

[0004] The technical solution adopted by the present invention to solve its technical problem is:

[0005] The pressure-type ceramic tubular membrane hardness and silicon removal integrated system of the present invention comprises a pipeline mixer, the inlet of the pipeline mixer is connected to the raw water pipeline, the outlet of the pipeline mixer is connected to the water inlet A of the ceramic tubular membrane treatment device through the pipeline, the inner cavity of the ceramic tubular membrane treatment device is divided into a ceramic tubular membrane filtration area and a coagulation pre-sedimentation area by a partition, a water outlet B is arranged on the upper part of the coagulation pre-sedimentation area, the water outlet B is connected to the raw water pump inlet, the raw water pump outlet is connected to the water inlet C of the upper part of the ceramic tubular membrane filtration area, and a water production port D is arranged on one side of the lower part of the ceramic tubular membrane filtration area, and the water production port D is respectively connected to the water production pipeline and The cleaning water tank has a water inlet H, and is provided with a water outlet I and a water outlet J. The water outlet I is provided at the upper end of the cleaning water tank and is connected to the water production pipeline. The water outlet J is connected to the inlet of the cleaning water pump. The outlet of the cleaning water pump is connected to the water inlet C through a pipeline. A sewage outlet E is provided on the ceramic tubular membrane filtration area near the side wall of the partition. A sewage inlet F is provided on the coagulation and pre-sedimentation area near the side wall of the partition. The sewage outlet E is connected to the sewage inlet F through a pipeline. A sludge outlet G is provided at the bottom of the coagulation and pre-sedimentation area. The sludge outlet G is connected to the inlet of the sludge dewatering device through a pipeline, and the outlet of the sludge dewatering device is connected to the raw water pipeline.

[0006] in:

[0007] Preferably, the pipeline mixer is provided with a drug adding port.

[0008] Preferably, an exhaust valve is provided on the top of the ceramic tubular membrane treatment device.

[0009] Preferably, the partition is arranged in a downwardly inclined manner at the middle and lower part of the inner cavity of the ceramic tubular membrane treatment device.

[0010] Preferably, a cleaning and dosing pipeline is connected to the pipeline between the cleaning water pump and the water inlet C.

[0011] Working principle and process:

[0012] When in use, the wastewater to be treated enters the pipeline mixer through the raw water pipeline, and the corresponding reagents are added through the dosing port in the pipeline mixer according to the nature of the wastewater through the dosing system for mixing reaction. The reacted wastewater enters the coagulation pre-sedimentation area through the water inlet A. The wastewater in the coagulation pre-sedimentation area undergoes a short-term coagulation pre-sedimentation step, and is directly pumped away by the raw water pump through the water outlet B and enters the ceramic tubular membrane filtration area through the water inlet C, and is filtered inside the membrane system. The filtered water is reused through the water production port D (enters the cleaning pool through the water inlet H, and is discharged from the water outlet I after the water is full, so as to keep the cleaning pool full) or discharged externally. The solid impurities intercepted by the ceramic tubular membrane enter the sewage inlet F through the sewage outlet E regularly and flow back to the coagulation pre-sedimentation area for precipitation. The coagulation pre-sedimentation area is regularly discharged. The sludge is discharged from the sludge outlet G and enters the sludge dehydration device for dehydration. The filtrate obtained by dehydration returns to the water inlet end of the raw water pipeline, and the sludge after pressure filtration is transported externally.

[0013] During the operation of the system, the membrane system needs to be cleaned regularly to prevent contamination of the membrane system. First, the water in the cleaning pool enters the cleaning water pump through the outlet J. The water from the cleaning water pump enters the ceramic tubular membrane filtration area through the inlet C. At the same time, cleaning agents are added to the cleaning pipeline. The cleaned water contains pollutants such as solid impurities. It enters the sewage inlet F through the sewage outlet E and flows back to the coagulation pre-sedimentation area for sedimentation. The coagulation pre-sedimentation area is regularly discharged for sludge.

[0014] Compared with the prior art, the present invention has the following beneficial effects:

[0015] 1. The present invention adopts modular design, and the system integrates flocculation, sedimentation and filtration, with high flexibility, small footprint, low energy consumption, good water quality, stable treatment effect, small dosage of chemicals and low sludge output; it is equipped with a full-automatic membrane cleaning device to clean the system regularly, which greatly extends the service life of the system.

[0016] 2. The ceramic tubular membrane has high strength, friction resistance, acid and alkali resistance, long service life and long replacement cycle, which greatly reduces the cost of subsequent maintenance and replacement. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the structure of the system of the present invention;

[0018] In the figure: 1. pipeline mixer; 2. dosing port; 3. ceramic tubular membrane treatment device; 4. exhaust valve; 5. partition; 6. ceramic tubular membrane filtration area; 7. coagulation pre-sedimentation area; 8. water inlet A; 9. water outlet B; 10. water inlet C; 11. water production port D; 12. sewage outlet E; 13. sewage inlet F; 14. sludge outlet G; 15. raw water pump; 16. cleaning water tank; 17. water inlet H; 18. water outlet I; 19. water outlet J; 20. cleaning water pump; 21. cleaning dosing pipeline; 22. sludge dewatering device. DETAILED DESCRIPTION

[0019] The present invention will be further described below in conjunction with the embodiments.

[0020] Example

[0021] like Figure 1As shown, the pressure-type ceramic tubular membrane hardness and silicon removal integrated system comprises a pipeline mixer 1, the inlet of the pipeline mixer 1 is connected to the raw water pipeline, the outlet of the pipeline mixer 1 is connected to the water inlet A8 of the ceramic tubular membrane treatment device 3 through a pipeline, the inner cavity of the ceramic tubular membrane treatment device 3 is divided into a ceramic tubular membrane filtration area 6 and a coagulation pre-sedimentation area 7 by a partition 5, a water outlet B9 is arranged on the upper part of the coagulation pre-sedimentation area 7, the water outlet B9 is connected to the inlet of the raw water pump 15, the outlet of the raw water pump 15 is connected to the water inlet C10 on the upper part of the ceramic tubular membrane filtration area 6, a water outlet D11 is arranged on one side of the lower part of the ceramic tubular membrane filtration area 6, and the water outlet D11 is respectively connected to the water inlet of the water production pipeline and the cleaning pool 16 Port H17, the cleaning water tank 16 is provided with a water outlet I18 and a water outlet J19, the water outlet I18 is provided at the upper end of the cleaning water tank 16 and is connected to the water production pipeline, the water outlet J19 is connected to the inlet of the cleaning water pump 20, and the outlet of the cleaning water pump 20 is connected to the water inlet C10 through a pipeline, the ceramic tubular membrane filtration area 6 is provided with a sewage outlet E12 on the side wall near the partition 5, the coagulation and pre-sedimentation area 7 is provided with a sewage inlet F13 on the side wall near the partition 5, the sewage outlet E12 is connected to the sewage inlet F13 through a pipeline, and the sludge outlet G14 is provided at the bottom of the coagulation and pre-sedimentation area 7, the sludge outlet G14 is connected to the inlet of the sludge dewatering device 22 through a pipeline, and the outlet of the sludge dewatering device 22 is connected to the raw water pipeline.

[0022] The pipeline mixer 1 is provided with a drug adding port 2 .

[0023] The ceramic tubular membrane treatment device 3 is provided with an exhaust valve 4 at the top.

[0024] The partition plate 5 is arranged in a downwardly inclined manner in the middle and lower part of the inner cavity of the ceramic tubular membrane treatment device 3 .

[0025] The pipeline between the cleaning water pump 20 and the water inlet C10 is connected with a cleaning and dosing pipeline 21 .

[0026] When in use, the wastewater to be treated enters the pipeline mixer 1 through the raw water pipeline, and the corresponding reagents are added through the dosing system through the dosing port 2 in the pipeline mixer 1 according to the properties of the wastewater for mixing reaction. The reacted wastewater enters the coagulation and pre-sedimentation zone 7 through the water inlet A8. The wastewater in the coagulation and pre-sedimentation zone 7 undergoes a short-time coagulation and pre-sedimentation step, is directly pumped away by the raw water pump 15 through the water outlet B9, and enters the ceramic tubular membrane filtration zone 6 through the water inlet C10, and is filtered inside the membrane system, wherein the filtered water is reused through the water production port D11 (enters the cleaning water pool 16 through the water inlet H17, and is discharged from the water outlet I18 after the water is full, so as to keep the cleaning water pool 16 always full) or discharged externally, and the solid impurities intercepted by the ceramic tubular membrane regularly enter the sewage inlet F13 through the sewage outlet E12 and flow back to the coagulation and pre-sedimentation zone 7 for precipitation, and the coagulation and pre-sedimentation zone 7 is regularly discharged with sludge. The sludge is discharged from the sludge outlet G14 and enters the sludge dehydration device for dehydration. The filtrate obtained by dehydration returns to the water inlet end of the raw water pipeline, and the sludge after filter pressing is transported out.

[0027] During the operation of the system, the membrane system needs to be cleaned regularly to prevent contamination of the membrane system. First, the water in the cleaning pool 16 enters the cleaning water pump through the outlet J, and the water outlet of the cleaning water pump enters the ceramic tubular membrane filtration area 6 through the inlet C10. At the same time, cleaning agents are added to the cleaning pipeline. The cleaned water contains pollutants such as solid impurities, which enter the sewage inlet F13 through the sewage outlet E12 and flow back to the coagulation pre-sedimentation area 7 for sedimentation. The coagulation pre-sedimentation area 7 is regularly discharged for sludge.

[0028] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that the technical solutions described in the above embodiments may still be modified, or some or all of the technical features may be replaced by equivalents. Such modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present invention, and should all be included in the scope of the claims and specification of the present invention.

Claims

1. A method for treating wastewater using a pressure-type ceramic tubular membrane integrated system for hardness and silicon removal, characterized in that: The invention comprises a pipeline mixer (1), wherein the inlet of the pipeline mixer (1) is connected to a raw water pipeline, and the outlet of the pipeline mixer (1) is connected to a water inlet A (8) of a ceramic tubular membrane treatment device (3) through a pipeline. The inner cavity of the ceramic tubular membrane treatment device (3) is divided into a ceramic tubular membrane filtration zone (6) and a coagulation pre-sedimentation zone (7) through a partition (5). A water outlet B (9) is arranged at the upper part of the coagulation pre-sedimentation zone (7), and the water outlet B (9) is connected to the inlet of a raw water pump (15). The outlet of the raw water pump (15) is connected to a water inlet C (10) at the upper part of the ceramic tubular membrane filtration zone (6). A water production port D (11) is arranged at one side of the lower part of the ceramic tubular membrane filtration zone (6), and the water production port D (11) is respectively connected to a water production pipeline and a water inlet H (17) of a cleaning water tank (16). The cleaning water tank (16) A water outlet I (18) and a water outlet J (19) are provided, the water outlet I (18) is provided at the upper end of the cleaning water tank (16) and is connected to the water production pipeline, the water outlet J (19) is connected to the inlet of the cleaning water pump (20), the outlet of the cleaning water pump (20) is connected to the water inlet C (10) through a pipeline, a sewage outlet E (12) is provided on the side wall of the ceramic tubular membrane filtration area (6) close to the partition (5), a sewage inlet F (13) is provided on the side wall of the coagulation pre-sedimentation area (7) close to the partition (5), the sewage outlet E (12) is connected to the sewage inlet F (13) through a pipeline, a sludge outlet G (14) is provided at the bottom of the coagulation pre-sedimentation area (7), the sludge outlet G (14) is connected to the inlet of the sludge dewatering device (22) through a pipeline, and the outlet of the sludge dewatering device (22) is connected to the raw water pipeline; The partition plate (5) is arranged in a downwardly inclined manner in the middle and lower part of the inner cavity of the ceramic tubular membrane treatment device (3); When in use, the wastewater to be treated enters the pipeline mixer (1) through the raw water pipeline, and the reagent is added through the dosing port (2) on the pipeline mixer (1) for mixing reaction; the wastewater after the reaction enters the coagulation pre-sedimentation zone (7) through the water inlet A (8); the wastewater in the coagulation pre-sedimentation zone (7) undergoes the coagulation pre-sedimentation step, is directly pumped away by the raw water pump (15) through the water outlet B (9), and enters the ceramic tubular membrane filtration zone (6) through the water inlet C (10), and is filtered inside the membrane system; wherein The filtered water is reused or discharged through the water outlet D (11); the solid impurities intercepted by the ceramic tubular membrane are regularly discharged along the downward inclined partition (5) through the sewage outlet E (12) into the sewage inlet F (13) and returned to the coagulation pre-sedimentation zone (7) for sedimentation; the coagulation pre-sedimentation zone (7) is regularly discharged for sludge; the sludge is discharged from the sludge outlet G (14) and enters the sludge dewatering device (22) for dehydration, and the filtrate obtained by dehydration is returned to the water inlet end of the raw water pipeline, and the sludge after the filter press is transported out; During the operation of the system, the membrane system needs to be cleaned regularly to prevent contamination of the membrane system. First, the water in the cleaning pool (16) enters the cleaning water pump (20) through the outlet J (19). The water discharged from the cleaning water pump (20) enters the ceramic tubular membrane filtration area (6) through the inlet C (10). At the same time, cleaning agents are added to the cleaning pipeline. The cleaned water contains solid impurities and pollutants, which enter the sewage inlet F (13) through the sewage outlet E (12) and flow back to the coagulation pre-sedimentation area (7) for sedimentation. The coagulation pre-sedimentation area (7) is regularly discharged with sludge.

2. The method for treating wastewater by using a pressure-type ceramic tubular membrane integrated system for removing hardness and silicon according to claim 1, characterized in that: The pipeline mixer (1) is provided with a drug adding port (2).

3. The method for treating wastewater by using a pressure-type ceramic tubular membrane integrated system for removing hardness and silicon according to claim 1, characterized in that: An exhaust valve (4) is provided on the top of the ceramic tubular membrane treatment device (3).

4. The method for treating wastewater by using a pressure-type ceramic tubular membrane integrated system for removing hardness and silicon according to claim 1, characterized in that: A cleaning and dosing pipeline (21) is connected to the pipeline between the cleaning water pump (20) and the water inlet C (10).

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