CN210030154U - Membrane bioreactor for treating oil refining wastewater - Google Patents

Abstract

The utility model relates to the technical field of oil refining wastewater treatment, in particular to a membrane bioreactor for treating oil refining wastewater. , which solves the problem of membrane fouling of the membrane bioreactor (MBR) and improves the efficiency of treating oil refining wastewater; it includes a raw water tank (1), a raw water pump (2), a reaction tank (3), a self-priming pump (13), The reclaimed water tank (14) and the controller (18) have the beneficial effects that: the utility model combines the biofilm with the MBR process, adopts the nano attapulgite clay composite hydrophilic polyurethane foam material as the biological carrier, and establishes a new type of biofilm —Membrane Bioreactor (BF‑MBR), which increases the microbial load, chemical oxygen demand (COD) removal efficiency and NH3‑N removal efficiency compared to conventional membrane bioreactors , the turbidity has decreased compared to the , resulting in better refining wastewater efficiency.

Description

A membrane bioreactor for treating oil refining wastewater

technical field

The utility model relates to the technical field of oil refining wastewater treatment, in particular to a membrane bioreactor for treating oil refining wastewater.

Background technique

As a strategic resource, oil plays an important role in the development of the national economy, but a large amount of waste water will be generated in the process of oil exploitation and oil refining. In this process, a large amount of wastewater with complex components, high oil content and poor biodegradability will be produced. At the same time, according to the development strategy of national energy conservation and emission reduction and the objective requirements of petrochemical enterprises for water conservation, petrochemical enterprises not only need to continuously reduce pollutant emissions, but also need to save water resources and increase the utilization rate of circulating water. Higher requirements, currently more advanced and widely used advanced wastewater treatment and reuse technology is mainly based on membrane separation technology.

Membrane bioreactor (MBR) is a combination of membrane separation technology and traditional activated sludge process. Compared with traditional processes, MBR has the advantages of small footprint, high pollutant removal rate, high sludge concentration, long sludge age and sludge production. It has the advantages of small amount, good water quality and reusability, strong impact resistance, and flexible control. It has gradually been paid attention to and applied in petrochemical wastewater treatment. Generally, petroleum refining and chemical enterprises conduct quality and diversion treatment from the source for their production wastewater, forming two categories of oily wastewater and salty wastewater. The oily wastewater contains less salt, and can reach the reuse standard through advanced treatment process without desalination process. For oily wastewater, petrochemical enterprises generally use pretreatment + A/O biochemical treatment + aeration biological filter + filter +

The method of activated carbon; the use of MBR process greatly shortens the treatment process, forming a process flow of pretreatment + A/O/MBR biochemical treatment, which has obvious advantages in terms of floor space and treatment efficiency.

However, when using the MBR process to treat petrochemical refining wastewater, the main difficulty lies in controlling the membrane fouling rate and maintaining membrane flux. Membrane fouling refers to the phenomenon that the membrane separation process interacts with the sludge mixture, resulting in a decrease in membrane flux. Several possible membrane fouling modes in MBR have been deduced and verified: (1) Colloidal particulate matter has Blockage of membrane pores; (2) adsorption of solutes in solution on membrane surface; (3) precipitation of sludge flocs on membrane surface; (4) compaction of filter cake layer on membrane surface; (5) composition of pollutants and Changes in properties during long-term operation. The problem of membrane fouling has greatly hindered the popularization and application of MBR. Membrane fouling reduces the performance of the membrane, increases the frequency of membrane replacement and the operating loss of the reactor, which seriously affects the economy and practicability of MBR technology.

SUMMARY OF THE INVENTION

The purpose of this utility model is to provide a membrane bioreactor using nanocomposite material as a biofilm carrier, which can increase the load of microorganisms, solve the problem of membrane pollution of membrane bioreactor (MBR), and improve the treatment of oil refining wastewater. s efficiency.

In order to achieve the above-mentioned purpose of the invention, the utility model adopts the following technical solutions:

A membrane bioreactor for treating oil refining wastewater, comprising a raw water tank 1, a raw water pump 2, a reaction tank 3, a self-priming pump 13, a reclaimed water tank 14, and a controller 18, characterized in that: the raw water tank 1, the raw water pump 2 , the reaction tank 3, the self-priming pump 13, and the reclaimed water tank 14 are connected in sequence through pipelines. The water outlet of the reclaimed water tank 14 is connected with a water outlet pipe 40, and the water outlet pipe 40 is connected with a drain pipe 41. The drain pipe 41 is connected with a return branch, the return branch includes a return pump 17, the water inlet of the return pump 17 is connected to the drain pipe 41 through a pipeline, and the water outlet of the return pump 17 is connected to the original water tank 1 through a pipeline. connection, the raw water pump 2 and the self-priming pump 13 are electrically connected to the controller 18, and the inner cavity of the reaction box 3 is divided into a first tank body 5 and a second tank body 6 by the partition plate 4. The bottoms of the first pool body 5 and the second pool body 6 are connected. The first pool body 5 is provided with a filler assembly 7. The filler assembly 7 is composed of upper and lower grids and fillers, and the fillers are fixed between the upper and lower grids. In the meantime, the filler is a microbial carrier composed of nano-attapulgite clay composite hydrophilic polyurethane foam material, and the second pool body 6 is provided with a membrane assembly 8, and the membrane module 8 is formed by the membrane at the bottom of the second pool body 6. Supported by the bracket 39, the membrane module 8 includes a membrane module housing, the membrane module housing is provided with a membrane module water inlet and a membrane module water outlet, the membrane module water inlet is covered with a filter layer, and the membrane module outlet is provided. The water outlet is connected to the water outlet of the reaction box 3 through a pipeline. The membrane module 8 is composed of PVDF hollow fibers. The bottom of the first tank body 5 is provided with an aeration device. The aeration device consists of an air pump 9, an air intake manifold 10, The intake branch pipe 11 and the ceramic aeration head 12 are formed. The middle water tank 14 is provided with a disinfection device and a water quality monitoring device 19.

The raw water tank 1, the reaction tank 3 and the middle water tank 14 are integrated boxes.

The water outlet pipe 40 of the reclaimed water tank 14 is provided with an eighth ball valve 36 , the drain pipe 41 is provided with a ninth ball valve 37 , the water quality monitoring device 19 , the eighth ball valve 36 , the ninth ball valve 37 and the controller 18 through electrical connection between them.

The disinfection device is composed of a chlorine tablet injection pipe 15 and chlorine tablets injected into the chlorine tablet injection pipe 15 , and the chlorine tablet injection pipe 15 is evenly provided with water inlet holes 16 .

A liquid level sensor 20 is disposed at the lower part of the inner wall of the raw water tank 1 , and the liquid level sensor 20 is electrically connected with the controller 18 .

The upper parts of the raw water tank 1, the reaction tank 3 and the middle water tank 14 are respectively provided with overflow pipes.

The lower parts of the raw water tank 1 , the reaction tank 3 and the middle water tank 14 are respectively provided with vent pipes, and corresponding ball valves are provided on the vent pipes, and the ball valves are electrically connected to the controller 18 .

The reaction box 3 is provided with a thermometer and a pH detector, and the thermometer and the pH detector are electrically connected to the controller 18 .

The beneficial effects of the utility model are: the utility model combines the biofilm with the MBR process, adopts the nano-attapulgite clay composite hydrophilic polyurethane foam material as the biological carrier, and establishes a new type of biofilm-membrane bioreactor (BF-MBR ), compared with the traditional membrane bioreactor (MBR), BF-MBR increased the microbial load, chemical oxygen demand (COD) removal efficiency and NH3-N removal efficiency, and turbidity decreased, resulting in better refining wastewater treatment efficiency.

Description of drawings

Fig. 1 is the process flow diagram of the present utility model;

FIG. 2 is a schematic diagram of the integrated structure of the central raw water tank, the reaction tank and the reclaimed water tank of the present invention.

Shown in the figure: raw water tank 1, raw water pump 2, reaction tank 3, baffle 4, first tank body 5, second tank body 6, packing assembly 7, membrane assembly 8, air pump 9, intake manifold 10, inlet Air branch pipe 11, ceramic aeration head 12, self-priming pump 13, reclaimed water tank 14, chlorine tablet injection pipe 15, water inlet 16, return pump 17, controller 18, water quality monitoring device 19, liquid level sensor 20, first Vent pipe 21, first ball valve 22, first overflow pipe 23, second ball valve 24, third ball valve 25, first check valve 26, second vent pipe 27, fourth ball valve 28, second overflow Pipe 29, fifth ball valve 30, sixth ball valve 31, second check valve 32, third vent pipe 33, seventh ball valve 34, third overflow pipe 35, eighth ball valve 36, ninth ball valve 37, Ten-ball valve 38, membrane support 39, outlet pipe 40, drain pipe 41.

Detailed ways

The specific embodiments of the present utility model will be described in further detail below with reference to the accompanying drawings and embodiments. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

Parts, structures, mechanisms, etc. involved in the following embodiments are conventional commercially available products unless otherwise specified.

Example 1:

A membrane bioreactor for treating oil refining wastewater, comprising a raw water tank 1, a raw water pump 2, a reaction tank 3, a self-priming pump 13, a reclaimed water tank 14, and a controller 18, characterized in that: the raw water tank 1, the raw water pump 2 , the reaction tank 3, the self-priming pump 13, and the reclaimed water tank 14 are connected in sequence through pipelines. The water outlet of the reclaimed water tank 14 is connected with a water outlet pipe 40, and the water outlet pipe 40 is connected with a drain pipe 41. The drain pipe 41 is connected with a return branch, the return branch includes a return pump 17, the water inlet of the return pump 17 is connected to the drain pipe 41 through a pipeline, and the water outlet of the return pump 17 is connected to the original water tank 1 through a pipeline. connection, the raw water pump 2 and the self-priming pump 13 are electrically connected to the controller 18, and the inner cavity of the reaction box 3 is divided into a first tank body 5 and a second tank body 6 by the partition plate 4. The bottoms of the first pool body 5 and the second pool body 6 are connected. The first pool body 5 is provided with a filler assembly 7. The filler assembly 7 is composed of upper and lower grids and fillers, and the fillers are fixed between the upper and lower grids. In the meantime, the filler is a microbial carrier composed of nano-attapulgite clay composite hydrophilic polyurethane foam material, and the second pool body 6 is provided with a membrane assembly 8, and the membrane module 8 is formed by the membrane at the bottom of the second pool body 6. Supported by the bracket 39, the membrane module 8 includes a membrane module housing, the membrane module housing is provided with a membrane module water inlet and a membrane module water outlet, the membrane module water inlet is covered with a filter layer, and the membrane module outlet is provided. The water outlet is connected to the water outlet of the reaction box 3 through a pipeline. The membrane module 8 is composed of PVDF hollow fibers. The bottom of the first tank body 5 is provided with an aeration device. The aeration device consists of an air pump 9, an air intake manifold 10, The intake branch pipe 11 and the ceramic aeration head 12 are formed. The middle water tank 14 is provided with a disinfection device and a water quality monitoring device 19.

The raw water tank 1, the reaction tank 3 and the middle water tank 14 are integrated MBR reaction tanks.

The water outlet of the raw water tank 1 is connected to the water inlet of the raw water pump 2 through a pipeline, and the water outlet of the raw water pump 2 is connected to the water inlet of the reaction tank 3 through a pipeline, and the water outlet of the reaction tank 3 is connected to the water inlet of the reaction tank 3 through a pipeline. The pipeline is connected to the water inlet of the self-priming pump 13, the water outlet of the self-priming pump 13 is connected to the water inlet of the medium water tank 14 through the pipeline, and the pipelines before and after the raw water pump 2 are provided with a second ball valve 24 and a third A ball valve 25, a fifth ball valve 30 and a sixth ball valve 31 are arranged on the pipelines before and after the self-priming pump 13, and a first check valve 26 is arranged on the pipeline between the raw water pump 2 and the reaction tank 3. The said A second check valve 32 is provided on the pipeline between the self-priming pump 13 and the reclaimed water tank 14 , an eighth ball valve 36 is arranged on the water outlet pipe 40 of the reclaimed water tank 14 , and a ninth ball valve is arranged on the drain pipe 41 37. A tenth ball valve 38 is provided on the pipeline between the reclaimed water tank 14 and the return pump 17, the second ball valve 24, the third ball valve 25, the fifth ball valve 30, the sixth ball valve 31, the eighth ball valve 36, The ninth ball valve 37 , the tenth ball valve 38 and the controller 18 are electrically connected.

The water quality monitoring device 19 and the controller 18 are electrically connected.

The disinfection device is composed of a chlorine tablet injection pipe 15 and chlorine tablets injected into the chlorine tablet injection pipe 15 , and the chlorine tablet injection pipe 15 is evenly provided with water inlet holes 16 . The treated reclaimed water is in contact with the chlorine tablet in the chlorine tablet injection pipe 15 through the water inlet hole 16 to disinfect the reclaimed water.

A liquid level sensor 20 is disposed at the lower part of the inner wall of the raw water tank 1 , and the liquid level sensor 20 is electrically connected with the controller 18 . When the liquid level of the raw water tank 1 measured by the liquid level sensor 20 is lower than the comparison value set in the controller 18, the controller 18 will control the raw water pump 2 and the self-priming pump 13 to stop working after power off, so as to carry out the raw water tank 1 operation. low level protection.

The upper part of the raw water tank 1 is provided with a first overflow pipe 23, the upper part of the reaction tank 3 is provided with a second overflow pipe 29, and the upper part of the middle water tank 14 is provided with a third overflow pipe. Flow tube 35. When the liquid level in the raw water tank 1, the reaction tank 3 and the middle water tank 14 rises due to failure or other reasons, the water can be discharged through the overflow pipe.

The lower part of the raw water tank 1 is provided with a first vent pipe 21, the first vent pipe 21 is provided with a first ball valve 22, and the lower part of the tank body of the reaction tank 3 is provided with a second vent pipe 27. A fourth ball valve 28 is provided on the second venting pipe 27, a third venting pipe 33 is provided on the lower part of the tank body of the medium water tank 14, and a seventh ball valve 34 is provided on the third venting pipe 33 , the first ball valve 22 , the fourth ball valve 28 , and the seventh ball valve 34 are electrically connected to the controller 18 .

The reaction box 3 is provided with a thermometer and a pH detector (not shown in the figure), and the thermometer and the pH detector are electrically connected to the controller 18. The thermometer and the pH detector are used to detect the reaction box in the wastewater treatment process. The temperature and pH value in 3. Since the survival of the microflora requires suitable temperature and pH value, when it is detected that the temperature value and pH value are not the optimum value, the controller 18 will remind the staff to adjust the temperature and pH value to the most suitable value.

The membrane area of the hydrophobic polyvinylidene fluoride (PVDF) hollow fiber is 1 m ² /piece, and the maximum membrane flux is 22 L/m ² ·h.

The biofilm-membrane bioreactor (BF-MBR) in the utility model adopts the method of continuous reflux feeding to treat waste water, the working volume is 25L, and the hydraulic retention time is 5 hours. That is, the volume of the reaction box 14 is 25L. The hydraulic retention time refers to the average residence time of the sewage to be treated in the reactor, that is, the average reaction time between the sewage and the microorganisms in the bioreactor. The hydraulic retention time of 5 hours means that the water has been treated in the reactor for 5 hours.

In the biofilm-membrane bioreactor (BF-MBR) of the present invention, in the automatic mode, the self-priming pump 13 runs for 13 minutes and stops for 2 minutes.

During the operation of the biofilm-membrane bioreactor (BF-MBR) in the utility model, 300 mg/L NaClO is used for regular weekly flushing to make it run stably. Before flushing, through the control of the controller 18, open the first ball valve 22, the fourth ball valve 28 and the seventh ball valve 34, and use the first vent pipe 21, the second vent pipe 27 and the third vent pipe 33 to remove the original The liquids in the water tank 1, the reaction tank 3 and the reclaimed water tank 14 are emptied, and then rinsed with 300 mg/L NaClO. After the rinsing is completed, the corresponding rinsing liquid in the corresponding tank is also emptied by the corresponding emptying pipe.

The working process of the utility model is as follows: before treating the sewage, the controller 18 firstly opens the second ball valve 24, the third ball valve 25, the fifth ball valve 30, the sixth ball valve 31 and the eighth ball valve 36, and then opens the second ball valve 24, third ball valve 25, fifth ball valve 30, sixth ball valve 31 and eighth ball valve 36 through the The treated oil refining wastewater, that is, the oil refining wastewater with the large particles removed through precipitation is poured into it from the tank mouth of the raw water tank 1, and the wastewater in the raw water tank 1 is sucked into the reaction tank 3 by the raw water pump 2. Activated sludge microbial population fixed on the microbial carrier composed of nano-attapulgite clay composite hydrophilic polyurethane foam material, which has been domesticated and specially used for the treatment of oil refining wastewater, adheres and grows to form a functional microbial film, and the functional microbial film acts on the oil refining wastewater, Pressurized aeration by the air pump 9 promotes the oil refining wastewater to pass through the functional microbial membrane. When the refining wastewater carries pollutants and oxygen and flows through the functional microbial membrane, the dissolved oxygen in the wastewater is consumed, and the organic pollutants are absorbed and degraded by the microorganisms on the functional microbial membrane. The wastewater is purified; the microorganisms continue to grow and reproduce, and the functional microbial film also thickens. When the thickness reaches a certain level, an anoxic or anaerobic layer is formed in the biofilm, which provides conditions for biological denitrification and phosphorus removal; at the same time, due to the air pump The action of pressurized aeration makes the biofilm continuously fall off and update by the shear force of the water; the treated wastewater is filtered by the hydrophobic polyvinylidene fluoride hollow fiber membrane of the membrane module 8, and the filtered wastewater is filtered by the self-priming pump 13 It enters the reclaimed water tank 14 under the action of the chlorine tablet sterilizer, and the sterilized waste water is monitored by the water quality monitoring device 19. When the discharge standard is reached through monitoring, the controller 18 controls to open the ninth ball valve 37. After treatment The reclaimed water is discharged from the drain pipe 41 for recycling. When the monitoring does not meet the discharge standard, the controller 18 controls to open the tenth ball valve 38, so that the waste water returns to the original water tank 1 under the action of the return pump 17, and is mixed for recycling.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner" and "outer" The orientation or positional relationship indicated by etc. is based on the orientation or positional relationship shown in the accompanying drawings, which is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the referred device or element must have a specific orientation, with a specific orientation. Therefore, it should not be construed as a limitation on the present invention. In addition, the terms "first", "second" and "third" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance; finally, it should be noted that the above are only the preferred options of the present invention. The embodiments are not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments. , or perform equivalent replacement to some of the technical features, any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present utility model shall all be included within the protection scope of the present utility model.

Claims (8)

1. The utility model provides a handle membrane bioreactor of oil refining waste water, includes former water tank (1), former water pump (2), reaction box (3), self priming pump (13), well water tank (14) and controller (18), its characterized in that: the device comprises a raw water tank (1), a raw water pump (2), a reaction tank (3), a self-priming pump (13) and a reclaimed water tank (14) which are sequentially connected through pipelines, wherein a water outlet of the reclaimed water tank (14) is connected with a water outlet pipe (40), the water outlet pipe (40) is connected with a water outlet pipe (41), the water outlet pipe (41) is connected with a backflow branch, the backflow branch comprises a backflow pump (17), a water inlet of the backflow pump (17) is connected with the water outlet pipe (41) through a pipeline, a water outlet of the backflow pump (17) is connected with the raw water tank (1) through a pipeline, the raw water pump (2) and the self-priming pump (13) are electrically connected with a controller (18), an inner cavity of the reaction tank (3) is divided into a first tank body (5) and a second tank body (6) through a partition plate (4), and bottoms of the first tank body (5) and the, the aeration device is characterized in that a filler component (7) is arranged in the first tank body (5), the filler component (7) is composed of an upper grid, a lower grid and a filler, the filler is fixed between the upper grid and the lower grid, the filler is a microbial carrier composed of a nano attapulgite clay composite hydrophilic polyurethane foam material, a membrane component (8) is arranged in the second tank body (6), the membrane component (8) is supported by a membrane support (39) at the bottom of the second tank body (6), the membrane component (8) comprises a membrane component shell, a membrane component water inlet and a membrane component water outlet are arranged on the membrane component shell, a filter layer covers the membrane component water inlet, the membrane component water outlet is connected with a water outlet of the reaction box (3) through a pipeline, the membrane component (8) is composed of PVDF hollow fibers, an aeration device is arranged at the bottom of the first tank body (5), and the, The air inlet manifold (10), the air inlet branch pipe (11) and the ceramic aeration head (12), wherein a disinfection device and a water quality monitoring device (19) are arranged in the middle water tank (14).

2. The membrane bioreactor for treating refinery wastewater according to claim 1, wherein: the raw water tank (1), the reaction tank (3) and the medium water tank (14) are integrated.

3. The membrane bioreactor for treating refinery wastewater according to claim 1, wherein: an eighth ball valve (36) is arranged on a water outlet pipe (40) of the middle water tank (14), a ninth ball valve (37) is arranged on a water outlet pipe (41), and the water quality monitoring device (19), the eighth ball valve (36), the ninth ball valve (37) and the controller (18) are electrically connected.

4. The membrane bioreactor for treating refinery wastewater according to claim 1, wherein: the disinfection device consists of a chlorine tablet feeding pipe (15) and chlorine tablets fed in the chlorine tablet feeding pipe (15), and water inlet holes (16) are uniformly formed in the chlorine tablet feeding pipe (15).

5. The membrane bioreactor for treating refinery wastewater according to claim 1, wherein: the lower part of the inner wall of the raw water tank (1) is provided with a liquid level sensor (20), and the liquid level sensor (20) is electrically connected with the controller (18).

6. The membrane bioreactor for treating refinery wastewater according to claim 1, wherein: overflow pipes are respectively arranged at the upper parts of the raw water tank (1), the reaction tank (3) and the middle water tank (14).

7. The membrane bioreactor for treating refinery wastewater according to claim 1, wherein: and emptying pipes are respectively arranged at the lower parts of the raw water tank (1), the reaction tank (3) and the medium water tank (14), corresponding ball valves are arranged on the emptying pipes, and the ball valves are electrically connected with the controller (18).

8. The membrane bioreactor for treating refinery wastewater according to claim 1, wherein: a thermometer and a PH detector are arranged in the reaction box (3) and are electrically connected with the controller (18).

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