Integrated self-cleaning water treatment system

Abstract

The utility model belongs to the technical field of water treatment, and particularly relates to an integrated self-cleaning water treatment system which comprises a three-stage sedimentation tank, a sewage precision filter, a PVDF (Polyvinylidene Fluoride) membrane filter element and a reclaimed water tank, the three-stage sedimentation tank comprises a first-stage grit chamber, a second-stage deoiling chamber and a third-stage sewage tank, a sewage pump is arranged in the third-stage sewage tank, and the reclaimed water tank is connected with the sewage precision filter. The sewage pump is connected with the sewage precision filter through a pipe, the sewage precision filter is connected with the conversion valve through a pipe, the conversion valve is connected with the PVDF membrane filter element, the PVDF membrane filter element is connected with the reclaimed water tank through a pipe, and the ozone generator is arranged in the reclaimed water tank; and the other end of the backwashing pump is connected with the PVDF membrane filter element through a pipe and a conversion valve.

Description

Technical Field

[0001] This utility model belongs to the field of water treatment technology, specifically relating to an integrated self-cleaning water treatment system, which is suitable for scenarios such as car wash wastewater recycling and industrial reclaimed water treatment. Background Technology

[0002] Currently, water treatment systems in scenarios such as car wash wastewater recycling and industrial water reuse treatment have the following pain points: 1. Low filtration efficiency: using a single sedimentation or filtration process makes it difficult to remove tiny suspended solids and colloidal pollutants, resulting in unstable effluent turbidity; 2. High maintenance costs: traditional backwashing relies on external water sources, consumes a lot of water, and requires manual cleaning or replacement after the filter element becomes clogged; 3. Incomplete sterilization: chemical disinfection is prone to producing byproducts, and ultraviolet sterilization requires high water transparency. Summary of the Invention

[0003] The purpose of this invention is to overcome the problems existing in the background technology and provide an integrated self-cleaning water treatment system that improves water quality through multi-stage filtration and ozone synergistic sterilization, and uses the filtered purified water to achieve self-cleaning backwashing, thereby reducing operation and maintenance costs.

[0004] To achieve the above objectives, the present invention adopts the following technical solution:

[0005] An integrated self-cleaning water treatment system includes a three-stage sedimentation tank, a precision wastewater filter, a PVDF membrane filter element, and a reclaimed water tank. The three-stage sedimentation tank includes a primary grit chamber, a secondary oil removal chamber, and a tertiary wastewater tank. A wastewater pump is installed in the tertiary wastewater tank. The wastewater pump is connected to the precision wastewater filter through a pipe. The precision wastewater filter is connected to a diverting valve through a pipe. The diverting valve is connected to the PVDF membrane filter element. The PVDF membrane filter element is connected to the reclaimed water tank through a pipe. An ozone generator is installed in the reclaimed water tank. The system also includes a backwash pump. One end of the backwash pump is connected to the reclaimed water tank through a pipe, and the other end of the backwash pump is connected to the PVDF membrane filter element through a pipe and the diverting valve.

[0006] Furthermore, a drain pipe is provided at the bottom of the PVDF membrane filter element, and a drain valve is provided on the drain pipe. The drain valve discharges the wastewater externally or connects to the primary sedimentation tank through a pipe.

[0007] Furthermore, the bottom of the precision wastewater filter is connected to a sewage discharge pipe via a tube.

[0008] Furthermore, a primary filter hole is provided between the primary grit chamber and the secondary oil removal chamber, and a secondary filter hole is provided between the secondary oil removal chamber and the tertiary sewage tank. Filter screens are provided in both the primary and secondary filter holes.

[0009] Furthermore, a flocculant is added to the secondary oil removal tank.

[0010] The advantages of this integrated self-cleaning water treatment system compared with the prior art are:

[0011] I. Water quality improvement: Three-stage sedimentation + two-stage filtration + ozone sterilization, effluent turbidity ≤1NTU, total bacterial count ≤100CFU / mL;

[0012] Water saving and consumption reduction: The filtered purified water is used for backwashing, achieving a water saving rate of ≥40% and eliminating the need for an external water source;

[0013] II. Long life design: PVDF membrane is resistant to chemical corrosion, backwashing logic delays clogging, and the filter element life is extended by 50%. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of an integrated self-cleaning water treatment system according to this utility model. Detailed Implementation

[0015] The present invention will be described in detail below with reference to specific implementation examples. The following implementation examples will help those skilled in the art to further understand the present invention, but do not limit the present invention in any way.

[0016] like Figure 1 As shown, this utility model relates to an integrated self-cleaning water treatment system, including a three-stage sedimentation tank 1, a wastewater precision filter 2, a PVDF membrane filter element 3, and a medium-water tank 4. The three-stage sedimentation tank 1 includes a primary grit chamber 11, a secondary oil removal chamber 12, and a tertiary wastewater tank 13. A wastewater pump 5 is installed in the tertiary wastewater tank 13. The wastewater pump 5 is connected to the wastewater precision filter 2 through a pipe. The wastewater precision filter 2 is connected to a diverter valve 6 through a pipe. The diverter valve 6 is connected to the PVDF membrane filter element 3. The PVDF membrane filter element 3 is connected to the medium-water tank 4 through a pipe. An ozone generator 7 is installed in the medium-water tank 4. The system also includes a backwash pump 8. One end of the backwash pump 8 is connected to the medium-water tank 4 through a pipe, and the other end of the backwash pump 8 is connected to the PVDF membrane filter element 3 through a pipe and the diverter valve 6.

[0017] The primary grit chamber 11 described in this scheme adopts an inclined plate sedimentation structure, with a wastewater retention time of ≥30 minutes to remove large suspended solids (particle size ≥100μm). Then, the wastewater is retained in the secondary oil removal tank 12 for ≥20 minutes to remove colloids and other substances. Finally, it undergoes slow sedimentation in the tertiary wastewater tank 13, resulting in an effluent turbidity ≤20 NTU. Next, the wastewater from the tertiary wastewater tank is directly pumped by the wastewater pump 5 to the wastewater precision filter 2 for filtration. The wastewater precision filter 2 uses a sintered stainless steel filter element with a filtration accuracy of 10μm and a pressure resistance ≥0. The filter presses down to 0.6 MPa to intercept residual suspended solids. After filtration, the filtered water is sent to the PVDF membrane filter element 3 via the diverting valve 6 for further filtration. The PVDF membrane filter element 3 is made of hollow fiber ultrafiltration membrane material (pore size 0.01 μm), which is resistant to ozone oxidation. After filtration, the filtered water is sent to the secondary water tank 4 for storage. The secondary water tank 4 is equipped with an ozone generator 7, which can generate ozone (output ≥ 5 g / h). The ozone is mixed into the water through an ejector, with a contact time ≥ 5 minutes, and the residual ozone concentration ≥ 0.1 mg / L. This can remove bacteria and large molecular organic matter, and deodorize and sterilize. When the PVDF membrane filter element 3 becomes clogged after a period of use, the backwash pump 8 is started. The backwash pump 8 can be placed next to the secondary water tank 4 to draw water from the secondary water tank 4 and return it through the diverting valve 6 to flush the PVDF membrane filter element 3, flushing out the blockage and achieving self-cleaning.

[0018] Furthermore, a sewage discharge pipe 9 is provided at the bottom of the PVDF membrane filter element 3, and a sewage discharge valve 10 is provided on the sewage discharge pipe 9. The sewage discharge valve discharges externally or is connected to the primary grit chamber 11 through a pipe. After the water treatment system has been used for a period of time, a certain amount of turbidity will always accumulate in the PVDF membrane filter element 3. With the sewage discharge pipe, it can be directly discharged externally through the sewage discharge valve or discharged into the primary grit chamber 11 for circulation treatment.

[0019] Furthermore, the bottom of the wastewater precision filter 2 is connected to the drain pipe 9 via a pipe. After a period of use, the wastewater precision filter 2 will accumulate a certain amount of turbidity, which can be discharged through the drain pipe.

[0020] Furthermore, a primary filter hole 15 is provided between the primary sedimentation tank 11 and the secondary oil removal tank 12, and a secondary filter hole 16 is provided between the secondary oil removal tank 12 and the tertiary sewage tank 13. Both the primary filter hole 15 and the secondary filter hole 16 are equipped with filter screens 17, which can filter flocculent objects.

[0021] Furthermore, a flocculant (such as PAC) is added to the secondary oil removal tank 12, and the residence time is ≥20 minutes, which improves the efficiency of removing colloidal substances.

[0022] The above specific embodiments are used to explain and illustrate the present utility model, and are not intended to limit the present utility model. Any modifications and changes made to the present utility model within the spirit and scope of the claims shall fall within the protection scope of the present utility model.

Claims

1. An integrated self-cleaning water treatment system, characterized in that... The system includes a three-stage sedimentation tank (1), a wastewater precision filter (2), a PVDF membrane filter element (3), and a medium water tank (4). The three-stage sedimentation tank (1) includes a primary grit chamber (11), a secondary oil removal chamber (12), and a tertiary wastewater tank (13). A wastewater pump (5) is installed in the tertiary wastewater tank (13). The wastewater pump (5) is connected to the wastewater precision filter (2) through a pipe. The wastewater precision filter (2) is connected to a diverter valve (6) through a pipe. The diverter valve (6) is connected to the PVDF membrane filter element (3). The PVDF membrane filter element (3) is connected to the medium water tank (4) through a pipe. An ozone generator (7) is installed in the medium water tank (4). The system also includes a backwash pump (8). One end of the backwash pump (8) is connected to the medium water tank (4) through a pipe. The other end of the backwash pump (8) is connected to the PVDF membrane filter element (3) through a pipe and the diverter valve (6).

2. The integrated self-cleaning water treatment system as described in claim 1, characterized in that... The bottom of the PVDF membrane filter element (3) is provided with a sewage discharge pipe (9), and a sewage discharge valve (10) is provided on the sewage discharge pipe (9). The sewage discharge valve discharges externally or is connected to the primary sedimentation tank (11) through a pipe.

3. The integrated self-cleaning water treatment system as described in claim 1, characterized in that... The bottom of the precision wastewater filter (2) is connected to the sewage discharge pipe (9) via a pipe.

4. The integrated self-cleaning water treatment system as described in claim 1, characterized in that... A primary filter hole (15) is provided between the primary grit chamber (11) and the secondary oil removal chamber (12), and a secondary filter hole (16) is provided between the secondary oil removal chamber (12) and the tertiary sewage tank (13). A filter screen (17) is provided in both the primary filter hole (15) and the secondary filter hole (16).

5. An integrated self-cleaning water treatment system as described in claim 1, characterized in that... Flocculant is added to the secondary oil removal tank (12).

Images