Backwashable tubular membrane system for landfill leachate

Abstract

The utility model belongs to the technical field of landfill leachate treatment, and particularly relates to a backwashing tubular membrane system for landfill leachate. According to the backwashing tubular membrane system for the landfill leachate, the water inlet three-way valve is arranged, so that a circulating water inlet route is automatically switched, fiber substances are prevented from being gathered on the end surface of the tubular membrane component, sewage blockage is reduced, and continuous operation without stop is ensured; a backwashing route is added, water produced by the tubular membrane reversely enters a tubular membrane assembly, macromolecular impurities blocked in tubular membrane holes are removed, flux is recovered, sludge blockage is delayed, efficient and stable operation is guaranteed, and the service life is prolonged.

Description

Technical Field

[0001] The utility model belongs to the technical field of landfill leachate treatment, and in particular relates to a backwashable tubular membrane system for landfill leachate. Background Art

[0002] Landfill leachate has become one of the most difficult industrial wastewaters to treat due to its high concentration of organic pollutants, high concentration of ammonia nitrogen, and complex pollutant composition. However, with the rapid growth of my country's national economy and the rapid advancement of social development, low-concentration and easily biochemically treated wastewater treatment technology has become increasingly mature. Among them, tubular membrane technology has the advantages of stable operation, small footprint, low operating cost, high organic matter removal rate and suspended solids removal rate, and has become the mainstream technology for landfill leachate treatment. In addition, this technology can also be applied to many fields such as food waste resource utilization, petroleum and pharmaceutical wastewater, wastewater softening, oilfield production and reinjection water, electronic wastewater, and sewage reuse.

[0003] At present, conventional tubular membrane devices are designed to directly connect four tubular membranes in series, and the operation mode is cross-flow filtration. However, during long-term operation, the end surface fiber material may be blocked, and the membrane surface or membrane pores may be blocked by sludge, which will affect the normal operation of the tubular membrane device. Once the above problems occur, the most common treatment method is to shut down the device for membrane cleaning and chemical cleaning. However, during repeated membrane cleaning and cleaning, the tubular membrane layer is easily damaged or even unusable, which reduces the service life of the membrane. Utility Model Content

[0004] The utility model aims to provide a tubular membrane system capable of backwashing for garbage leachate, so as to solve the technical problem that the existing tubular membrane device for leachate is easy to be blocked.

[0005] In order to solve the above technical problems, the utility model provides a backwashable tubular membrane system for landfill leachate, comprising:

[0006] A tubular membrane module formed by connecting a plurality of tubular membranes in series, wherein the two ends of the tubular membrane module are respectively a water inlet end a and a water inlet end b;

[0007] A concentrated water tank, which is connected to the water inlet end b through a return pipe, and a return valve is provided on the return pipe;

[0008] A water inlet three-way valve, the first end of which is connected to the concentrated water tank through a circulation pump, the second end of which is connected to the water inlet end a, and the third end of which is connected to the reflux pipe located between the reflux valve and the water inlet end b;

[0009] A concentrate water pipe, one end of which is connected to the concentrate water tank, and the other end of which is connected to the pipe section between the second end of the water inlet three-way valve and the water inlet end a, and a concentrate water valve is provided on the concentrate water pipe;

[0010] The water production box is connected to each water production port of the tubular membrane assembly through a water production pipe, and a water production valve is arranged on the water production box.

[0011] In one embodiment of the present application, the backwashable tubular membrane system further comprises:

[0012] The backwash pipe has one end connected to the water production pipe between the water production valve and the tubular membrane assembly, and the other end connected to the water production tank through a backwash pump, and a backwash valve is arranged on it.

[0013] In one embodiment of the present application, the backwashable tubular membrane system further comprises:

[0014] A cleaning / flushing pipe, one end of which is connected to the pipe section between the second end of the water inlet three-way valve and the water inlet end a, and the other end of which is connected to the water production tank through a backwash pump.

[0015] The cleaning concentrated water pipe has one end connected to the water inlet end b and the other end connected to the water production tank, and is provided with a cleaning concentrated water valve.

[0016] In one embodiment of the present application, the backwashable tubular membrane system further includes a control module;

[0017] The circulation pump, the water inlet three-way valve, the concentrated water valve, the reflux valve, the concentrated water cleaning valve, the cleaning / flushing valve, the backwash valve, and the water production valve are all electrically connected to the control module.

[0018] The beneficial effects of the utility model are as follows: the backwashable tubular membrane system for landfill leachate of the utility model is provided with a water inlet three-way valve, which automatically switches the circulating water inlet route, prevents the accumulation of fibrous materials on the end surface of the tubular membrane component, reduces clogging, and ensures its continuous operation without interruption; adds a backwash route, and the water produced by the tubular membrane enters the tubular membrane component in the reverse direction, removes large molecular impurities clogging in the tubular membrane pores, restores flux, delays sludge clogging, ensures its efficient and stable operation and extends its service life.

[0019] Other features and advantages of the utility model will be described in the following description, and partly become apparent from the description, or understood by practicing the utility model. The purpose and other advantages of the utility model are realized and obtained by the structures particularly pointed out in the description and the drawings.

[0020] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, preferred embodiments are given below and described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0022] Figure 1 It is a schematic diagram of a backwashable tubular membrane system for landfill leachate of the utility model. DETAILED DESCRIPTION

[0023] In order to make the purpose, technical solution and advantages of the embodiments of the utility model clearer, the technical solution of the utility model will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0024] See also Figure 1 In one embodiment of the present application, a backwashable tubular membrane system for leachate comprises: a tubular membrane assembly formed by a plurality of tubular membranes connected in series, the two ends of the tubular membrane assembly being respectively an inlet end a and an inlet end b; a concentrate tank, which is connected to the inlet end b through a return pipe, and a return valve is provided on the return pipe; an inlet three-way valve, a first end of which is connected to the concentrate tank through a circulation pump, a second end of which is connected to the inlet end a, and a third end of which is connected to the return pipe between the return valve and the inlet end b; a concentrate pipe, one end of which is connected to the concentrate tank, and the other end of which is connected to a pipe section between the second end of the inlet three-way valve and the inlet end a, and a concentrate valve is provided on the concentrate pipe; a production water tank, which is connected to each production water outlet of the tubular membrane assembly through a production water pipe, and a production water valve is provided on it.

[0025] In this embodiment, during the water production stage, the water inlet three-way valve is controlled to realize the switching of cyclic water inlet between the water inlet end a and the water inlet end b, thereby preventing the accumulation of fibrous materials on the end surface of the tubular membrane module, reducing fouling and clogging, and ensuring its continuous operation.

[0026] Furthermore, the backwashable tubular membrane system also includes: a backwash pipe, one end of which is connected to the water production pipe located between the water production valve and the tubular membrane assembly, and the other end is connected to the water production tank through a backwash pump, and a backwash valve is arranged on the backwash pipe.

[0027] In this embodiment, a backwash pump and a backwash valve are provided at the water production end to increase the backwash route. The water produced by the tubular membrane enters the tubular membrane assembly in reverse, which can remove large molecular impurities that clog the pores of the tubular membrane, restore the flux, delay sludge clogging, ensure its efficient and stable operation and extend its service life.

[0028] Furthermore, the backwashable tubular membrane system also includes: a cleaning / flushing pipe, one end of which is connected to the pipe section between the second end of the water inlet three-way valve and the water inlet end a, and the other end is connected to the water production tank through a backwash pump; a cleaning concentrate water pipe, one end of which is connected to the water inlet end b, and the other end is connected to the water production tank, and a cleaning concentrate water valve is arranged on it.

[0029] In this embodiment, flushing and chemical cleaning routes are added. Chemical cleaning does not require a chemical cleaning tank. Cleaning agents can be added to the production water tank and chemical cleaning can be completed by manually switching valves.

[0030] In one embodiment of the present application, the backwashable tubular membrane system also includes a control module; the circulation pump, water inlet three-way valve, concentrate valve, reflux valve, cleaning concentrate valve, cleaning / flushing valve, backwash valve, and water production valve are all electrically connected to the control module.

[0031] Specifically, each valve can be a solenoid valve; the control module can be but not limited to a PLC; according to needs, a control program can be preset to automatically switch valves, change water production or cleaning methods, reduce the frequency of chemical cleaning, and efficiently remove colloidal particles and macromolecular substances on the membrane surface and inside the membrane pores, with a high degree of automation.

[0032] In this embodiment, the tubular membrane assembly can be but is not limited to 4 tubular membranes connected in series, and the design can be changed according to the actual processing volume. It can withstand a backwash pressure of 0.05-0.1MPa without damaging the membrane layer structure, thereby reducing the cost of membrane replacement.

[0033] The following are examples of water production, flushing, backwashing and chemical cleaning processes:

[0034] In one application scenario, during the water production stage, by controlling the water inlet three-way valve, the water inlet end a and the water inlet end b can be switched to avoid blockage by fiber materials.

[0035] a circulation route: the circulation pump, reflux valve, and production water valve are open, the concentrate valve is closed, and the first and second ends of the water inlet three-way valve are open, and the third end is closed; then the leachate is transported from the concentrate tank to the water inlet end a through the circulation pump and enters the tubular membrane module, the concentrate flows back to the concentrate tank through the water inlet end b and the reflux pipe, and the production water enters the production water tank through the production water pipe;

[0036] b Water inlet route: the circulation pump, concentrate valve and production water valve are opened, the reflux valve is closed, and the first and third ends of the water inlet three-way valve are opened, and the second end is closed; the leachate is transported from the concentrate tank to the water inlet end b through the circulation pump and enters the tubular membrane assembly, the concentrate flows back to the concentrate tank through the water inlet end a and the concentrate pipe, and the production water enters the production water tank through the production water pipe.

[0037] It should be noted that see Figure 1 During the water production stage, the concentrated water cleaning valve, backwash valve, cleaning / flushing valve and backwash pump are all in the closed state.

[0038] In one application scenario, during the flushing stage, the backwash pump, cleaning / flushing valve, and reflux valve need to be turned on, and the circulating pump and other valves are closed; the produced water is then transported from the produced water tank to the water inlet a of the tubular membrane module via the backwash pump and the cleaning / flushing valve, and flushed in the same direction as the produced water of the tubular membrane module to wash away the residual dirt on the membrane surface, and the flushing water is returned to the concentrated water tank via the water inlet b and the reflux valve.

[0039] In one application scenario, during the backwash stage, the backwash pump, backwash valve, concentrate valve and / or reflux valve need to be opened, and the circulating pump and other valves are closed; the produced water is then transported from the produced water tank to the produced water end of the tubular membrane module via the backwash pump and backwash valve, and backwashed in the direction opposite to the produced water of the tubular membrane module to backwash away the dirt adsorbed in the membrane pores, and the backwash water is returned to the concentrate tank.

[0040] In one application scenario, during the chemical cleaning stage, the backwash pump, cleaning / flushing valve, cleaning concentrate valve, and water production valve need to be turned on, and the circulation pump and other valves are closed; a solution prepared with corresponding reagents and water is added to the water production tank, and the cleaning water is transported from the water production tank to the water inlet end a of the tubular membrane module via the backwash pump and the cleaning / flushing valve, and chemical cleaning is performed in the same direction as the water production of the tubular membrane module, and the cleaning water is transported to the water production tank via the water production pipe and the cleaning concentrate pipe; optionally, the cleaning method can be circulation for 2 hours - soaking for 2 hours - circulation for 2 hours, and the order of chemical cleaning is acid cleaning - clean water cleaning - alkali cleaning - clean water cleaning, etc.

[0041] In summary, the utility model of the backwashable tubular membrane system for landfill leachate increases the backwash route, and the produced water of the tubular membrane enters the tubular membrane assembly in the reverse direction, removes the macromolecular impurities that clog the tubular membrane pores, restores the flux, delays the sludge clogging, ensures its efficient and stable operation and prolongs its service life; a water inlet three-way valve is provided to automatically switch the circulating water inlet route to prevent the accumulation of fiber materials on the end surface of the tubular membrane assembly, reduce the clogging, and ensure its continuous operation without stopping; the tubular membrane can remove the clogging through three cleaning methods, namely flushing, backwashing, and chemical cleaning, wherein the chemical cleaning does not require the setting of a chemical cleaning tank, and the cleaning agent can be added to the produced water tank, and the chemical cleaning is completed by switching the valve; the automatic switching valve can be set by the program to change the cleaning method, reduce the frequency of chemical cleaning, and efficiently remove the colloidal particles and macromolecular substances on the membrane surface and inside the membrane pores, with a high degree of automation; the tubular membrane assembly is not limited to 4 tubular membranes, and the design can be changed according to the actual processing volume. It can withstand a backwash pressure of 0.05-0.1MPa without destroying the membrane layer structure, thereby reducing the cost of membrane replacement.

[0042] The various devices selected in this application (components whose specific structures are not described) are all universal standard parts or components known to technical personnel in this field, and their structures and principles can be known to technical personnel through technical manuals or through conventional experimental methods.

[0043] In the description of the embodiments of the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection.

[0044] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0045] Based on the above ideal embodiments of the utility model, the relevant staff can make various changes and modifications without departing from the technical concept of the utility model through the above description. The technical scope of the utility model is not limited to the content of the specification, and its technical scope must be determined according to the scope of the claims.

Claims

1. A backwashable tubular membrane system for landfill leachate, characterized in that: include: A tubular membrane module formed by connecting a plurality of tubular membranes in series, wherein the two ends of the tubular membrane module are respectively a water inlet end a and a water inlet end b; A concentrated water tank, which is connected to the water inlet end b through a return pipe, and a return valve is provided on the return pipe; A water inlet three-way valve, the first end of which is connected to the concentrated water tank through a circulation pump, the second end of which is connected to the water inlet end a, and the third end of which is connected to the reflux pipe located between the reflux valve and the water inlet end b; A concentrate water pipe, one end of which is connected to the concentrate water tank, and the other end of which is connected to the pipe section between the second end of the water inlet three-way valve and the water inlet end a, and a concentrate water valve is provided on the concentrate water pipe; The water production box is connected to each water production port of the tubular membrane assembly through a water production pipe, and a water production valve is arranged on the water production box.

2. The backwashable tubular membrane system according to claim 1, characterized in that: The backwashable tubular membrane system also includes: The backwash pipe has one end connected to the water production pipe between the water production valve and the tubular membrane assembly, and the other end connected to the water production tank through a backwash pump, and a backwash valve is arranged on it.

3. The backwashable tubular membrane system according to claim 2, characterized in that: The backwashable tubular membrane system also includes: A cleaning / flushing pipe, one end of which is connected to the pipe section between the second end of the water inlet three-way valve and the water inlet end a, and the other end of which is connected to the production water tank through a backwash pump; The cleaning concentrated water pipe has one end connected to the water inlet end b and the other end connected to the water production tank, and is provided with a cleaning concentrated water valve.

4. The backwashable tubular membrane system according to claim 3, characterized in that: The backwashable tubular membrane system also includes a control module; The circulation pump, the water inlet three-way valve, the concentrated water valve, the reflux valve, the concentrated water cleaning valve, the cleaning / flushing valve, the backwash valve, and the water production valve are all electrically connected to the control module.

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