MBR membrane cleaning system

Abstract

The utility model relates to an MBR (Membrane Biological Reactor) membrane cleaning system which comprises an MBR membrane component, a water producing tank, a water producing pipe connected between the MBR membrane component and the water producing tank, a backwashing mechanism, a dosing mechanism and a fan mechanism, the fan mechanism comprises a fan, an aeration pipe arranged in the MBR membrane tank and a first gas conveying pipe connected between the fan and the aeration pipe, and the chemical adding mechanism comprises a chemical box group for storing chemicals and a chemical pipe group connected between the chemical box group and the backwashing pipe; and the fan mechanism further comprises a second gas conveying pipe connected between the fan and the backwashing pipe. When the cleaning system disclosed by the utility model is used for carrying out backwashing or chemical washing, gas and backwashing water or chemical liquid are synchronously fed into the MBR membrane component for backwashing, and the intensity of backwashing or chemical washing in membrane filaments is increased by utilizing mixed oscillation of the gas and the chemical, so that compared with the traditional backwashing or chemical washing, the backwashing and chemical washing effects are greatly enhanced.

Description

Technical Field

[0001] The utility model relates to an MBR membrane cleaning system. Background Art

[0002] In the prior art, the MBR membrane is usually cleaned by flushing the membrane fibers from the inside with a backwash pump. Although this method has a certain cleaning effect, in order to protect the membrane fibers of the membrane assembly, the general backwash pressure will not be too high, resulting in the stubborn pollution accumulated in some membrane pores that cannot be removed by backwashing, which eventually leads to the clogging of the membrane assembly. Summary of the invention

[0003] The technical problem to be solved by the utility model is to overcome the deficiencies of the prior art and provide an MBR membrane cleaning system with better backwashing effect.

[0004] In order to solve the above technical problems, the utility model adopts the following technical solutions:

[0005] An MBR membrane cleaning system comprises an MBR membrane pool, an MBR membrane assembly arranged in the membrane pool, a water production tank, a water production pipe connected between the MBR membrane assembly and the water production tank, a backwashing mechanism for backwashing the MBR membrane assembly, a drug adding mechanism for adding drugs to the MBR membrane assembly for drug washing, and a fan mechanism, wherein the backwashing mechanism comprises a backwashing pipe connected to the MBR membrane assembly, the fan mechanism comprises a fan, an aeration pipe arranged in the MBR membrane pool, and a first gas delivery pipe connected between the fan and the aeration pipe, the drug adding mechanism comprises a drug box group for storing drugs and a drug pipe group connected between the drug box group and the backwashing pipe, and the fan mechanism further comprises a second gas delivery pipe connected between the fan and the backwashing pipe.

[0006] In some specific embodiments, a gas flushing valve and a pressure reducing valve are sequentially arranged on the second gas delivery pipe, so as to facilitate the delivery of the pressure-stabilized gas to the backwash pipe to protect the membrane fibers in the MBR membrane assembly.

[0007] In some specific embodiments, the backwash pipe is connected between the water production pipe and the water production box, and the connection between the second gas delivery pipe and the backwash pipe is located between the connection between the water production pipe and the backwash pipe and the connection between the reagent pipe group and the backwash pipe.

[0008] In some embodiments, a backwash valve and a backwash pump are sequentially arranged on the backwash pipe.

[0009] In some specific embodiments, the medicine box group includes a first medicine box for storing an acid solution and a second medicine box for storing an alkaline solution, the medicine pipe group includes a first medicine pipe connected between the first medicine box and the backwash pipe and a second medicine pipe connected between the second medicine box and the backwash pipe, and the first medicine pipe and the second medicine pipe are respectively connected between the backwash valve and the backwash pump.

[0010] In some specific embodiments, an acid dosing pump and an acid cleaning valve are respectively provided on the first chemical pipe, and an alkali dosing pump and an alkali cleaning valve are respectively provided on the second chemical pipe.

[0011] In some specific implementations, a water production valve and a water production pump are sequentially arranged on the water production pipe.

[0012] In some specific embodiments, the backwash pipe is connected between the water production pipe and the water production tank, the water production pump is located between the water production valve and the water production tank, and the connection between the backwash pipe and the water production pipe is located between the water production valve and the MBR membrane assembly.

[0013] In some specific embodiments, a gas valve is provided on the first gas delivery pipe.

[0014] In some specific embodiments, all valves are electric valves, and the fans are blowers.

[0015] In some specific embodiments, the MBR membrane cleaning system further comprises a bracket disposed in the MBR membrane pool, and the aeration pipe and the MBR membrane assembly are respectively disposed on the bracket.

[0016] Due to the application of the above technical solution, the utility model has the following advantages compared with the prior art:

[0017] When performing backwashing or chemical washing, the cleaning system of the utility model simultaneously introduces gas together with backwashing water or chemical liquid into the MBR membrane component for backwashing, and utilizes the mixed oscillation of gas and liquid to increase the intensity of backwashing or chemical washing inside the membrane fibers. Compared with traditional backwashing or chemical washing, the effects of backwashing and chemical washing are greatly enhanced. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic structural diagram of an MBR membrane cleaning system of a representative embodiment of the utility model;

[0019] In the figure: 1, bracket; 2, water production pump; 3, water production valve; 4, pressure reducing valve; 5, gas flushing valve; 6, backwashing valve; 7, backwashing pump; 8, acid cleaning valve; 9, alkali cleaning valve; 10, acid dosing pump; 11, alkali dosing pump; 12, blower; 13, first medicine box; 14, second medicine box; 15, gas valve; 16, MBR membrane pool; 17, liquid level meter; 18, pressure gauge;

[0020] 110, water production pipe; 120, backwash pipe; 130, first chemical pipe; 140, second chemical pipe; 150, first gas delivery pipe; 160, second gas delivery pipe. DETAILED DESCRIPTION

[0021] The present invention is further described below with reference to the accompanying drawings and specific embodiments:

[0022] See also Figure 1 The MBR membrane cleaning system shown includes an MBR membrane pool 16, a bracket 1 arranged in the MBR membrane pool 16, a liquid level meter 17 for monitoring the liquid level in the MBR membrane pool 16, an MBR membrane assembly arranged on the bracket 1, a water production tank, a water production pipe 110 connected between the MBR membrane assembly and the water production tank, a backwashing mechanism for backwashing the MBR membrane assembly, a dosing mechanism for adding drugs to the MBR membrane assembly for drug washing, and a fan mechanism.

[0023] The backwash mechanism includes a backwash pipe 120 connected between the water production pipe 110 and the water production tank; the fan mechanism includes a blower 12, an aeration pipe arranged on the support 1 and located below the MBR membrane assembly, a first gas delivery pipe 150 connected between the blower 12 and the aeration pipe, and a second gas delivery pipe 160 connected between the blower 12 and the backwash pipe 120; the dosing mechanism includes a medicine box group for storing medicines and a medicine pipe group connected between the medicine box group and the backwash pipe 120, the medicine box group includes a first medicine box 13 for storing acid solution and a second medicine box 14 for storing alkaline solution, and the medicine pipe group includes a first medicine pipe 130 connected between the first medicine box 13 and the backwash pipe 120 and a second medicine pipe 140 connected between the second medicine box 14 and the backwash pipe 120. An acid dosing pump 10 and an acid cleaning valve 8 are respectively arranged on the first medicine pipe 130, and an alkali dosing pump 11 and an alkali cleaning valve 9 are respectively arranged on the second medicine pipe 140.

[0024] The gas flushing valve 5 and the pressure reducing valve 4 are respectively arranged on the second gas delivery pipe 160. When the backwashing process or the chemical cleaning process is performed by using the original aeration blower 12, the gas flushing valve 5 is opened to mix the gas and the backwashing water or the gas and the chemical. The stubborn stains in the membrane pores are flushed out by the flushing of water or chemical and the vibration of gas, thereby achieving the effect of enhancing the cleaning of the MBR membrane assembly. In addition, the pressure reducing valve 4 can ensure that the membrane fibers in the MBR membrane assembly will not be damaged due to excessive intake pressure during air intake, thereby affecting the water quality of the produced water.

[0025] Specifically, the connection between the second gas delivery pipe 160 and the backwash pipe 120 is located between the connection between the water production pipe 110 and the backwash pipe 120 and the connection between the reagent pipe group and the backwash pipe 120 .

[0026] A backwash valve 6 and a backwash pump 7 are sequentially arranged on the backwash pipe 120 , the reagent pipe group is connected between the backwash valve 6 and the backwash pump 7 , and the second gas delivery pipe 160 is connected between the backwash valve 6 and the connection between the water production pipe 110 and the backwash pipe 120 .

[0027] The water production pipe 110 is provided with a water production valve 3 and a water production pump 2 in sequence, the water production pump 2 is located between the water production valve 3 and the water production tank, and the connection between the backwash pipe 120 and the water production pipe 110 is located between the water production valve 3 and the MBR membrane assembly. A pressure gauge 18 is also provided on the water production pipe 110.

[0028] The first gas delivery pipe 150 is provided with a gas valve 15, and the gas valve 15 is closed during the backwashing or chemical washing process.

[0029] In this example, all valves are electric valves, and the opening and closing of the air flushing valve 5 can be automatically controlled by PLC to coordinate the backwashing time. It is fully automatic control and does not require human operation.

[0030] The working principle of the MBR membrane cleaning system set up above:

[0031] When backwashing is performed, the gas valve 15 and the water production valve 3 are closed, and the backwashing valve 6 and the gas flushing valve 5 are opened, so that the air in the blower 12 is stabilized by the pressure reducing valve 4 and then enters the membrane fibers of the MBR membrane assembly together with the backwashing water for backwashing. The mixed vibration of air and water is used to increase the intensity of the backwashing inside the membrane fibers. Compared with ordinary water washing, the backwashing effect is greatly enhanced. After the backwashing is completed, the water in the MBR membrane pool is discharged.

[0032] When performing chemical cleaning, close the gas valve 15 and the water production valve 3, open the acid cleaning valve 8 or the alkali cleaning valve 9, and open the gas flushing valve 5 at the same time, so that the air in the blower 12 can enter the membrane wire of the MBR membrane assembly with the chemical after being stabilized by the pressure reducing valve 4 for chemical cleaning, and use the mixed vibration of gas and liquid to make the mixture of chemical and water more uniform, and also make it easier for the chemical to react with the pollutants inside the membrane wire, and bring the cleaned pollutants out of the membrane wire with the liquid backwashing water. It is convenient to flush out the pollutants, and the chemical cleaning effect can be improved by about 15% compared with traditional cleaning.

[0033] Features of the above MBR membrane cleaning system:

[0034] 1) When backwashing or chemical washing is used, the pressure-stabilized gas is introduced at the same time to greatly improve the cleaning effect. At the same time, the offline cleaning cycle can be extended from the conventional 6-month period to 9-month period. If the inlet water quality is good, it can be extended to 1 year or even longer.

[0035] 2) No need to add an additional air intake blower, directly use the aeration blower of the original membrane system, and deliver the air volume of the blower to the backwash pipe during backwashing or chemical washing, and mix it with the backwashing water or chemical to perform air intake backwashing, thereby enhancing the cleaning effect and saving equipment costs;

[0036] 3) A pressure reducing valve is provided on the second gas delivery pipe used for backwashing to ensure that the membrane fibers are not damaged internally due to excessive intake pressure, thereby affecting the quality of produced water.

[0037] The above embodiments are only for illustrating the technical concept and features of the utility model, and their purpose is to enable people familiar with this technology to understand the content of the utility model and implement it accordingly. They cannot be used to limit the protection scope of the utility model. All equivalent changes or modifications made according to the spirit of the utility model should be included in the protection scope of the utility model.

Claims

1. An MBR membrane cleaning system, comprising an MBR membrane pool, an MBR membrane assembly arranged in the membrane pool, a water production tank, a water production pipe connected between the MBR membrane assembly and the water production tank, a backwashing mechanism for backwashing the MBR membrane assembly, a drug adding mechanism for adding drugs to the MBR membrane assembly for drug washing, and a fan mechanism, wherein the backwashing mechanism comprises a backwashing pipe connected to the MBR membrane assembly, the fan mechanism comprises a fan, an aeration pipe arranged in the MBR membrane pool, and a first gas delivery pipe connected between the fan and the aeration pipe, characterized in that: The medicine adding mechanism includes a medicine box group for storing medicines and a medicine pipe group connected between the medicine box group and the backwashing pipe, and the fan mechanism also includes a second gas delivery pipe connected between the fan and the backwashing pipe.

2. The MBR membrane cleaning system according to claim 1, characterized in that: A gas flushing valve and a pressure reducing valve are sequentially arranged on the second gas delivery pipe.

3. The MBR membrane cleaning system according to claim 1, characterized in that: The backwash pipe is connected between the water production pipe and the water production box, and the connection between the second gas delivery pipe and the backwash pipe is located between the connection between the water production pipe and the backwash pipe and the connection between the reagent pipe group and the backwash pipe.

4. The MBR membrane cleaning system according to claim 1, characterized in that: A backwash valve and a backwash pump are arranged in sequence on the backwash pipe.

5. The MBR membrane cleaning system according to claim 4, characterized in that: The medicine box group includes a first medicine box for storing acid solution and a second medicine box for storing alkaline solution. The medicine pipe group includes a first medicine pipe connected between the first medicine box and the backwash pipe and a second medicine pipe connected between the second medicine box and the backwash pipe. The first medicine pipe and the second medicine pipe are respectively connected between the backwash valve and the backwash pump.

6. The MBR membrane cleaning system according to claim 5, characterized in that: An acid dosing pump and an acid cleaning valve are respectively arranged on the first chemical pipe, and an alkali dosing pump and an alkali cleaning valve are respectively arranged on the second chemical pipe.

7. The MBR membrane cleaning system according to claim 1, characterized in that: A water production valve and a water production pump are arranged in sequence on the water production pipe.

8. The MBR membrane cleaning system according to claim 7, characterized in that: The backwash pipe is connected between the water production pipe and the water production tank, the water production pump is located between the water production valve and the water production tank, and the connection between the backwash pipe and the water production pipe is located between the water production valve and the MBR membrane assembly.

9. The MBR membrane cleaning system according to claim 1, characterized in that: The first gas delivery pipe is provided with a gas valve.

10. The MBR membrane cleaning system according to any one of claims 1 to 9, characterized in that: All valves are electric valves; and / or, the MBR membrane cleaning system further comprises a bracket arranged in the MBR membrane pool, and the aeration pipe and the MBR membrane assembly are respectively arranged on the bracket.

Images