CN216837309U

CN216837309U - Device for treating organic wastewater difficult to degrade

Info

Publication number: CN216837309U
Application number: CN202220429266.8U
Authority: CN
Inventors: 王燕
Original assignee: Lanzhou University of Technology
Current assignee: Lanzhou University of Technology
Priority date: 2022-03-01
Filing date: 2022-03-01
Publication date: 2022-06-28
Anticipated expiration: 2032-03-01

Abstract

A device for treating refractory organic wastewater comprises a gas-water mixing cavity, an electrochemical reaction cavity, a biomembrane reaction cavity and a discharge cavity which are sequentially arranged in a shell from bottom to top; the gas-water mixing cavity is provided with a water inlet and a gas inlet; the electrochemical reaction cavity is separated from the gas-water mixing cavity by an annular water distribution disc, and an electrochemical anode plate and an electrochemical cathode plate are arranged in the electrochemical reaction cavity; the biological membrane reaction cavity is separated from the electrochemical reaction cavity by a metal filter screen, and a biological membrane carrier is arranged in the biological membrane reaction cavity; the discharge cavity is separated from the biomembrane reaction cavity by an activated carbon layer, and is connected with a drain pipe and an exhaust pipe. The organic wastewater difficult to degrade enters the electrochemical reaction cavity through the water distribution plate, and the organic pollutants difficult to degrade are oxidized and degraded by strong oxidizing substances generated on the surface of the electrode. Then the intermediate product obtained by degradation and residual small amount of organic pollutants which are difficult to degrade enter the biological region of the biomembrane reaction cavity and are mineralized and removed by the microbial membrane attached to the surface of the fibrous membrane.

Description

Device for treating organic wastewater difficult to degrade

Technical Field

The utility model belongs to the technical field of waste water treatment, a difficult degradation organic waste water's processing is related to, in particular to handle difficult degradation organic waste water's device.

Background

With the development of industry and the improvement of living standard, the types and discharge amount of industrial organic wastewater and domestic sewage are increasing day by day, and the components are more complex, so that organic wastewater generated in the industries such as petrifaction, coking, papermaking, pharmacy, plastics, dyes and the like has a common point on water quality, namely, the organic wastewater has high organic matter content and is difficult to biodegrade, and the organic wastewater is collectively called high-concentration organic wastewater difficult to degrade. Due to the generation of high-concentration refractory organic wastewater and the characteristic attributes of the high-concentration refractory organic wastewater, the following main hazards exist: firstly, the water is in aerobic hazard, and due to biodegradation, high-concentration organic wastewater can cause oxygen deficiency and even anaerobism of a receiving water body, and most aquatic organisms die, so that stink is generated, and the water quality and the environment are deteriorated; secondly, the high-concentration organic wastewater causes the water to lose use value and seriously affects the normal life of people nearby the water; and thirdly, the organic wastewater with ultrahigh concentration contains a large amount of toxic organic matters, which can be continuously accumulated and stored in natural environments such as water, soil and the like, and finally enter human bodies to harm the health of the human bodies.

The research on the treatment of the organic pollutants difficult to degrade in water is more, and the adopted technologies mainly comprise physical methods (adsorption, ultrafiltration and the like), chemical methods (advanced oxidation), biochemical methods (activated sludge and the like). But most methods have low processing efficiency by single technology. At present, the treatment technology for the pollutants takes biochemistry as a core, and simultaneously, a membrane separation technology, an electrochemical technology and the like are gradually developed to optimize the prior mature process by combining the development of new materials. However, the problem still existed in the practical treatment is that the traditional biochemical treatment process and the Membrane Bioreactor (MBR) process technology which is more common now encounter high concentration sewageWater such as certain industrial waste waters and the like cannot completely remove contaminants. Electrochemical advanced oxidation (ECO) is a new sewage treatment technology, which can rapidly generate strong oxidizing substances (such as hydroxyl radical, H) by applying voltage between electrodes₂O₂Etc.) to effectively degrade the refractory organic pollutants in the sewage. However, the electrochemical advanced oxidation method is difficult to effectively mineralize organic pollutants, and intermediate products generated after high-concentration organic pollutants which are difficult to degrade are oxidized and degraded by substances with strong oxidizing property are easy to accumulate in the system and enter a water body along with the effluent, so that the quality of the effluent is influenced. Therefore, the establishment of an integrated method with synergistic effect to remove the refractory organic pollutants in water with high efficiency and low energy consumption is a hotspot of research in the field of water treatment.

Disclosure of Invention

In order to overcome the shortcoming of above-mentioned prior art, the utility model aims to provide a handle device of difficult degradation organic waste water, based on the principle that biomembrane coupling electrochemistry was handled, jointly use electrocatalytic oxidation unit and microbial film reaction system, utilize chemical energy to promote the decomposition of difficult degradation pollutant to the micromolecular pollutant, rethread environmental microbiology acts on the degradation pollutant, finally realizes the discharge to reach standard of difficult degradation organic pollutant.

In order to realize the purpose, the utility model discloses a technical scheme is:

a device for treating refractory organic wastewater comprises a gas-water mixing cavity, an electrochemical reaction cavity, a biological membrane reaction cavity and a discharge cavity which are sequentially arranged in a shell from bottom to top;

the gas-water mixing cavity is provided with a water inlet and a gas inlet;

the electrochemical reaction cavity is separated from the gas-water mixing cavity by an annular water distribution disc, and an electrochemical anode plate and an electrochemical cathode plate are arranged in the electrochemical reaction cavity;

the biological membrane reaction cavity is separated from the electrochemical reaction cavity by a metal filter screen, and a biological membrane carrier is arranged in the biological membrane reaction cavity;

the discharge cavity is separated from the biomembrane reaction cavity by an activated carbon layer, and is connected with a drain pipe and an exhaust pipe.

In one embodiment, the air-water mixing cavity is connected with a vent pipe.

In one embodiment, the water inlet is provided with a water pump, an electromagnetic flow meter I and a waste water pressure meter; the air inlet is provided with high pressure positive blower, electromagnetic flow meter II and gas pressure meter.

In one embodiment, the electrochemical anode plate is a titanium-based mesh plate, and the electrochemical cathode plate is a stainless steel mesh plate.

In one embodiment, a vertical rotating shaft is arranged in the electrochemical reaction cavity, and the electrochemical anode plate and the electrochemical cathode plate are vertically arranged and connected to the rotating shaft.

In one embodiment, the electrochemical anode plate and the electrochemical cathode plate are respectively provided with N groups which are uniformly connected to the rotating shaft at intervals, and N is more than or equal to 2.

In one embodiment, the rotating shaft penetrates through the biofilm reaction chamber, a plurality of brackets are arranged in the biofilm reaction chamber, each bracket is connected to the rotating shaft, and the biofilm carrier is fixed on the bracket.

In one embodiment, the supports are at least two different heights and at least two at the same height.

In one embodiment, the biofilm carrier is a polyurethane sponge or foam of fibrous material in series, the polyurethane sponge or foam being of a cubic structure, the polyurethane sponge or foam being inoculated with and cultured with microorganisms.

In one embodiment, the drainage cavity comprises a drainage cavity, the drainage cavity is separated from the biomembrane reaction cavity by an activated carbon layer, an overflow weir is arranged at the top of the drainage cavity, a water collecting tank is arranged around the drainage cavity, the exhaust pipe is connected to the top of the water collecting tank, and the drainage pipe is connected to the bottom of the water collecting tank.

Compared with the prior art, the beneficial effects of the utility model are that:

1. the utility model discloses utilize the electrochemistry to the catalytic degradation of organic matter in the waste water and to the electric stimulation effect of microorganism metabolism, improve the ability that the microorganism handled high concentration, difficult degradation organic waste water. When the reactor operates in a continuous flow mode, high-efficiency oxidative degradation and high-efficiency mineralization removal of refractory organic matters can be realized by generating strong oxidative substances and biological synergy without adding any chemical reagent, and the removal efficiency of the reactor on the refractory organic pollutants is greatly improved.

2. The utility model provides a processing method application scope is wide, especially has good throughput to high concentration refractory organic waste water, and the high concentration waste water that coking wastewater, bio-pharmaceuticals, printing and dyeing, chemical industry, plastics, food and beverage and industries such as landfill produced has good suitability.

3. The treatment device provided by the utility model can save 50-70% of the investment and the operating cost of the traditional treatment process due to the short-flow and high-efficiency operation mode; the operation is flexible, the continuous or pulse operation can be adopted, the one-stage and two-stage series connection operation can be carried out according to the requirement, and the treatment effect is good.

4. The utility model provides a processing apparatus of high concentration difficult degradation organic waste water adopts the integrated design, and simple structure, compactness are easily made the modularization and are equipped extensive applicability.

Drawings

Fig. 1 is a schematic structural diagram of the present invention.

Fig. 2 is a schematic view of the top view structure of the annular water distribution plate of the present invention.

Fig. 3 is a schematic view of the top view structure of the biofilm carrier of the present invention.

Detailed Description

The following describes embodiments of the present invention in detail with reference to the drawings and examples.

As shown in figure 1, the utility model relates to a device for treating refractory organic wastewater, which comprises a gas-water mixing chamber 1, an electrochemical reaction chamber 2, a biomembrane reaction chamber 3 and a discharge chamber 4 which are arranged in the shell from bottom to top in sequence. In one embodiment, the housing may take a cylindrical configuration, illustratively, with a diameter in the range of 0.7-1.0m and a height in the range of 3.5-4.0 m.

The gas-water mixing cavity 1 is located at the bottom of the whole device and is provided with a water inlet 5 and a gas inlet 6, the water inlet 5 is used for inputting the refractory organic wastewater to be treated, the gas inlet 6 is used for inputting gas, and the gas and the refractory organic wastewater are mixed in the gas-water mixing cavity 1. Illustratively, the air-water mixing chamber 1 is connected with a blow-down pipe 8 to regulate the internal ambient pressure. The water inlet 5 is provided with a water pump 23, an electromagnetic flow meter I24 and a waste water pressure gauge 25; so as to monitor the flow and regulate the pressure of the input organic wastewater difficult to degrade. The air inlet 6 is provided with a high-pressure fan 26, an electromagnetic flow meter II27 and a gas pressure meter 28 so as to monitor the flow and regulate the pressure of the input gas.

The electrochemical reaction cavity 2 is positioned above the gas-water mixing cavity 1 and is separated from the gas-water mixing cavity 1 by an annular water distribution disc 7, the annular water distribution disc 7 can be arranged in the gas-water mixing cavity 1, and the sectional area of the annular water distribution disc is the same as that of the gas-water mixing cavity 1. Illustratively, referring to fig. 2, the annular water distribution tray 7 comprises a water inlet pipe 71, water distribution branches 72 and water distribution holes 73, wherein the water inlet pipe 71 is located at a central position, the water distribution branches 72 are radially connected to the water inlet pipe 71, the water distribution holes 73 are distributed in an annular array, and the outlet of the annular array is upward. The electrochemical reaction chamber 2 is internally provided with an electrochemical anode plate 9 and an electrochemical cathode plate 10, in the embodiment, the electrochemical anode plate 9 adopts a titanium-based mesh plate, the electrochemical cathode plate 10 adopts a stainless steel mesh plate, both are connected with an external voltage-stabilizing direct-current power supply 12, and an electric field is applied by the voltage-stabilizing direct-current power supply 12 to form an electrolysis region in the electrochemical reaction chamber 2. Further, in the present embodiment, a vertical rotating shaft 11 is further disposed in the electrochemical reaction chamber 2, the electrochemical anode plate 9 and the electrochemical cathode plate 10 are both vertically disposed and symmetrically connected to the rotating shaft 11, and the rotating shaft 11 is connected to an external motor device 13. Illustratively, the electrochemical anode plate 9 and the electrochemical cathode plate 10 are respectively provided with N groups (N is more than or equal to 2), are uniformly and fixedly arranged on the periphery of the rotating shaft 11 at intervals, and rotate along with the rotating shaft 11 under the driving of the motor device 13. In this embodiment, N is 6, i.e. the included angle between each adjacent electrochemical anode plate 9 and electrochemical cathode plate 10 is 30 °. The net structure of the electrochemical anode plate 9 and the electrochemical cathode plate 10 can increase the contact area of the electrodes and the wastewater, and uniform and slow stirring is easier to realize.

Biological membraneThe reaction cavity 3 is positioned above the electrochemical reaction cavity 2 and is separated from the electrochemical reaction cavity 2 by a metal filter screen 14, and a biological membrane carrier 15 is arranged in the biological membrane reaction cavity 3. In one embodiment, the metal filter 14 is a stainless steel perforated mesh with a mesh aperture size of 150-300 mesh, which can control the flow rate of the effluent and retain the fallen biofilm carriers 15. The rotating shaft may be disposed in the biofilm reaction chamber 3, and the rotating shaft may be integrated with the rotating shaft 11 in the electrochemical reaction chamber 2, that is, the rotating shaft 11 is inserted into the biofilm reaction chamber 3, and at this time, a plurality of supports 16 are disposed in the biofilm reaction chamber 3, each support 16 is connected to the rotating shaft 11, and the biofilm carrier 15 is fixed on the support 16, as shown in fig. 3. Illustratively, the brackets 16 are at least two different heights, and at least two brackets are at the same height, and are fixed on the periphery of the rotating shaft 11 in a spaced, parallel and parallel manner. In a preferred embodiment, the length of the individual stent 16 is in the range of 0.5 to 0.8m, and the number of biofilm carriers 15 on an individual stent 16 may be in the range of 10 to 30. In the utility model, the biomembrane carrier 15 is polyurethane sponge or foam which is formed by connecting fiber materials in series, the polyurethane sponge or foam is in a cubic structure, the side length of each side can be 3-5cm, the average aperture can be 2-4mm, and the density can be 0.8-1.5 g-cm^-1. The material of the fiber material is selected from one or more of polyester fiber, polyamide fiber and polyethylene fiber. The polyurethane sponge or foam is inoculated with and cultured with microorganisms. Specifically, the activated sludge method can be adopted to inoculate the microorganisms and culture the microorganisms, namely, the biomembrane carrier is soaked in the sewage treatment plant A²Aerating activated sludge in an aerobic section of the/O process for 24 hours, and then putting the activated sludge into a full-mixing continuous flow device for culturing at the temperature of 20-25 ℃ and the water inflow rate of 20-30 mL/min^-1The aeration rate is 0.5-5 L.min^-1The dissolved oxygen is controlled to be 7-12 mg.L^-1And the culture time is 7-10 days. The ratio of C, N and P in the culture solution was about 150:5: 1.

The discharge cavity 4 is arranged above the biomembrane reaction cavity 3 and is separated from the biomembrane reaction cavity 3 by an activated carbon layer 17, and the discharge cavity 4 is connected with a drain pipe 22 and an exhaust pipe 18. The activated carbon layer 17 is used for further removing residual organic matters in the effluent after biochemical treatment and carrying out adsorption treatment on waste gas generated in the reaction process. In one embodiment, the drain chamber 4 comprises a drain chamber 19 and a water collection tank 21, the drain chamber 19 is separated from the biofilm reaction chamber 3 by an activated carbon layer 17, the water collection tank 21 is arranged around the drain chamber 19, an overflow weir 20 is arranged at the top of the drain chamber 19, and water flowing out of the drain chamber 19 enters the water collection tank 21 through the overflow weir 20. The water collection sump 21 is a relatively closed space to which the exhaust pipe 18 is connected at the top and the drain pipe 22 is connected at the bottom.

Furthermore, the utility model can also comprise an automatic control system (not shown in the schematic diagram), which comprises data acquisition and control and is used for making the processing device automatically run, analyze and self-adaptively adjust; the automatic control system is connected to the Internet to realize remote access, control and diagnosis and analysis. Therefore, the automatic operation and analysis of the wastewater treatment device are met, and the relevant parameters can be adaptively adjusted according to the data provided by the online monitoring instrument. Water quality instruments can be arranged in the electrochemical reaction cavity 2, the biomembrane reaction cavity 3 and the discharge cavity 4 according to actual needs, including the detection of indexes such as pH value, conductivity and the like.

The utility model provides a difficult degradation organic wastewater treatment facility's concrete flow does: an electric field is applied by a stabilized DC power supply 12 to form an electrolysis region in the electrochemical reaction chamber 2. The parallel and parallel brackets 16 are used as carriers for the growth and the aggregation of microorganisms, and activated sludge is inoculated to form a biological film on the surface of the fiber film to form a biological area of the biological film reaction cavity 3. High-concentration refractory organic wastewater to be treated is pumped into a gas-water mixing chamber 1 of the treatment device through a water inlet pump 23, high-pressure air or other gases are introduced into the gas-water mixing chamber 1 through a high-pressure fan 26 or a blower, and the wastewater and the high-pressure gases enter an annular water distribution disc 7 in the gas-water mixing chamber 1 together. In the electrochemical reaction chamber 2, the organic pollutants which are difficult to degrade in the sewage are oxidized and degraded by the strong oxidizing substances generated on the surface of the electrode. Then, the intermediate product obtained by degradation and a small amount of residual organic pollutants which are difficult to degrade enter a biological area of the biomembrane reaction cavity 3, are mineralized and removed by the microbial membrane attached to the surface of the fibrous membrane, the treated water flows out through a drain pipe 22, and the waste gas generated in the reaction process is discharged after being adsorbed and removed by activated carbon.

Claims

1. A device for treating refractory organic wastewater is characterized by comprising a gas-water mixing cavity (1), an electrochemical reaction cavity (2), a biomembrane reaction cavity (3) and a discharge cavity (4) which are sequentially arranged in a shell from bottom to top;

the gas-water mixing cavity (1) is provided with a water inlet (5) and a gas inlet (6);

the electrochemical reaction cavity (2) is separated from the gas-water mixing cavity (1) by an annular water distribution disc (7), and an electrochemical anode plate (9) and an electrochemical cathode plate (10) are arranged in the electrochemical reaction cavity (2);

the biological film reaction cavity (3) is separated from the electrochemical reaction cavity (2) by a metal filter screen (14), and a biological film carrier (15) is arranged in the biological film reaction cavity (3);

the discharge cavity (4) and the biomembrane reaction cavity (3) are separated by an activated carbon layer (17), and the discharge cavity (4) is connected with a drain pipe (22) and an exhaust pipe (18).

2. The apparatus for treating refractory organic wastewater according to claim 1, wherein the gas-water mixing chamber (1) is connected with a blow-down pipe (8).

3. The apparatus for treating refractory organic wastewater according to claim 1, wherein the water inlet (5) is provided with a water pump (23), an electromagnetic flow meter I (24) and a wastewater pressure gauge (25); the air inlet (6) is provided with a high-pressure fan (26), an electromagnetic flowmeter II (27) and a gas pressure meter (28).

4. The apparatus for treating refractory organic wastewater as defined in claim 1, wherein the electrochemical anode plate (9) is a titanium-based mesh plate, and the electrochemical cathode plate (10) is a stainless steel mesh plate.

5. The apparatus for treating refractory organic wastewater according to claim 1 or 4, wherein a vertical rotating shaft (11) is arranged in the electrochemical reaction chamber (2), and the electrochemical anode plate (9) and the electrochemical cathode plate (10) are both vertically arranged and connected to the rotating shaft (11).

6. The apparatus for treating refractory organic wastewater according to claim 5, wherein N groups of electrochemical anode plates (9) and electrochemical cathode plates (10) are uniformly connected to the rotating shaft (11) at intervals, and N is greater than or equal to 2.

7. The apparatus for treating refractory organic wastewater according to claim 5, wherein the rotating shaft (11) penetrates through the biofilm reaction chamber (3), a plurality of brackets (16) are arranged in the biofilm reaction chamber (3), each bracket (16) is connected to the rotating shaft (11), and the biofilm carriers (15) are fixed on the brackets (16).

8. Device for treating refractory organic wastewater according to claim 7, characterized in that the supports (16) are at least at two different heights and at least two at the same height.

9. The apparatus for treating refractory organic wastewater according to claim 1, wherein the biofilm carrier (15) is a polyurethane sponge or foam formed by connecting fiber materials in series, the polyurethane sponge or foam has a cubic structure, and microorganisms are inoculated and cultured in the polyurethane sponge or foam.

10. The apparatus for treating refractory organic wastewater according to claim 1, wherein the drainage chamber (4) comprises a drainage chamber (19), the drainage chamber (19) is separated from the biofilm reaction chamber (3) by an activated carbon layer (17), an overflow weir (20) is arranged on the top of the drainage chamber (19), a water collection tank (21) is arranged around the drainage chamber (19), the exhaust pipe (18) is connected to the top of the water collection tank (21), and a drain pipe (22) is connected to the bottom of the water collection tank (21).