Underwater Aeration Device for Synergistic Process of Activated Carbon Sludge and Biochemical Film Hanging of Heavy Oil Sewage and Its Treatment Method

Abstract

The present invention belongs to the technical field of heavy oil sewage treatment, and discloses an underwater aeration device and a treatment method thereof for the synergistic process of activated carbon sludge and biochemical film hanging in heavy oil sewage. The self-priming air dissolving pump of the present invention draws the heavy reflux activated sludge in the biochemical system, and at the same time dissolves air to form an aerated water body. Through the pipeline connection method, it is pumped into each underwater jet aeration device by pump pressure. The underwater jet aeration device sprays the air dissolving water through the aperture to complete the aeration process. During the underwater jet process of the high-speed and high-pressure air dissolving water, the water flow radiates horizontally, and the small-aperture gas dissipates vertically, forming agitation between the gas buoyancy and the high-speed fluid, completing the biochemical process reflux, and at the same time preventing the deposition of heavy activated carbon sludge. For the deposited part, under the mode of increasing hydraulic impact, it can return to the flowing state.

Description

Technical Field

[0001] The present invention belongs to the technical field of heavy oil sewage treatment, in particular to an underwater aeration device for the collaborative process of activated carbon sludge and biochemical film hanging of heavy oil sewage and a treatment method thereof. Background Technique

[0002] Whether it is industrial sewage or domestic sewage, the sewage treatment technology is basically fixed. It can be divided into an oil removal section, a flotation section, and a biochemical section according to stages. If higher water quality requirements are needed, a reclaimed water process section is generally set up. Oil removal and flotation are also called the physical and chemical section. The physical and chemical section uses chemical agents and the characteristics of process structures to remove pollutants. The biochemical section is mainly divided into the activated sludge method, the biological film hanging method, and the biological pond method. The operating conditions of the biochemical section include anoxic, anaerobic, aerobic, and facultative environments. Due to the characteristics of heavy oil sewage, conventional sewage treatment processes are difficult to treat normally. The actual operating process has additional components on the basis of the conventional process, specifically:

[0003] (1) Biochemical combined with advanced oxidation technology

[0004] It mainly consists of a conventional biochemical process (generally the activated sludge method or the biological film hanging method), an oxidant generator or dosing device, and an oxidation reaction device.

[0005] Working principle: After the conventional biochemical process removes part of the organic compounds, the remaining difficult-to-degrade part is strongly oxidized by a high-level oxidant into carbon dioxide, nitrogen, and water.

[0006] Main disadvantages: The intensifier is highly dangerous, and at the same time, the strong oxidant has relatively serious oxidation corrosion, and there are relatively strict restrictions on the oxidants used in sewage treatment.

[0007] (2) Biochemical combined with electrodialysis technology

[0008] It mainly consists of a conventional biochemical process (generally the activated sludge method or the biological film hanging method), an electrodialysis device, and a concentrated solution treatment / reflux device.

[0009] Working principle: After the conventional biochemical process removes part of the organic compounds, the remaining difficult-to-separate pollutants and their water bodies are dialyzed under the action of an electric field using the selective permeability of a semi-permeable membrane to separate the pollutants in the water body from the water body, forming concentrated sewage and desalinated sewage, so that the sewage treatment reaches the standard for external discharge or reclaimed water reuse.

[0010] Main disadvantages: High power consumption, the secondary sewage such as concentrated sewage formed is more difficult to treat, and it is difficult to control the quantity values of various pollutant factors in the desalinated water body.

[0011] (3) Biochemical combined with reverse osmosis technology

[0012] It consists of the main conventional biochemical process (generally the activated sludge method or the biological film hanging method), the reverse osmosis filtration device, and the backwashing device.

[0013] Working principle: After removing some organic compounds by the conventional biochemical process, the remaining difficult-to-separate pollutants and their water body enter the reverse osmosis filtration device. The reverse osmosis membrane is a selective semi-permeable membrane. Except for water molecules, the rest of the impurities are isolated, thus purifying the sewage.

[0014] Main disadvantages: The reverse osmosis process forms secondary sewage and part of the sludge, which are more difficult to treat. At the same time, when the reverse osmosis membrane treats heavy oil sewage, the backwashing frequency is extremely high, and it is also difficult to control the quantity values of various pollutant factors in the semi-permeable membrane. Summary of the Invention

[0015] In order to overcome the deficiencies of the prior art, the present invention provides an underwater aeration device and its treatment method for the synergistic process of heavy oil sewage activated carbon sludge and biochemical film hanging. The main purposes are: one is to use the synergistic process of heavy oil sewage activated carbon sludge and biochemical film hanging to treat heavy oil sewage up to the standard for external discharge; the other is to reasonably control the quantity values of pollutants in the sewage.

[0016] The above objects of the present invention are achieved by the following technical solutions:

[0017] The underwater aeration device for the synergistic process of heavy oil sewage activated carbon sludge and biochemical film hanging has its water inlet end flange-connected to the injector. One end of the steel pipeline is connected to the injector through a flange, and the other end is gear-connected to the hydraulic impact chamber. One end of the diffuser pipe is connected to the mixing chamber pipeline, and the other end is connected to the connecting pipe pipeline. The hydraulic impact chamber is provided with a hydraulic impact self-rotating gear, the hydraulic impact self-rotating gear is provided with a hydraulic impact duct, and the gravity attenuation spring is thread-connected to the hydraulic impact self-rotating gear.

[0018] The specific aeration method using the above aeration device is as follows: The main body steam-water mixture is shunted from the mixing chamber and enters the jet orifice for spraying. It successively passes through the diffuser pipe and the connecting pipe from the mixing chamber and enters the hydraulic impact chamber. When it impacts the hydraulic impact duct, the hydraulic impact duct drives the hydraulic impact self-rotating gear to rotate for spraying.

[0019] Using the above aeration method of the aeration device, the vertical buoyancy aeration is changed to parallel jet aeration. Specifically, the aeration device is evenly laid in the pool body, and the aeration volume and the reflux ratio are controlled by the valve opening or the flowmeter reading. Using the parallel water flow and air flow, aeration and reflux are carried out, and at the same time, the heavy activated sludge is impacted to make it in a flowing state.

[0020] Treatment method for the synergistic process of activated carbon sludge and biochemical film hanging in heavy oil sewage. A biological film hanging module is set in the first corridor of each group in the first-stage biochemical system. The module combination starts to be set 0.5 m below the liquid level and 0.8 m away from the side wall. The row spacing is 1 m and the column spacing is 1.5 m. The hanging lock is made of corrosion-resistant material. The sewage enters the first-stage biochemical system through a lift pump. During the initial operation, the heavy carrier of the activated sludge method and the heavy oil sewage are directly mixed according to the ratio of the simulated experimental gradient regression curve while the water is being inlet. An oil-repellent matrix elastic porous filler is hung in the heavy carrier activated sludge, and at the same time, the activated sludge is refluxed. The discharge of the excess sludge is 1.2 - 1.5 times the amount of the activated carbon put in, forming a synergistic process layout with double carriers of the heavy carrier and biological film hanging, enhancing the contact area between microorganisms and water, enhancing the biological treatment capacity, ensuring that the effluent of the first-stage biochemical system is at 100 - 130 mg / L, and then passing through the adsorption and filtration of the second-stage biochemical system, and finally discharging up to the standard.

[0021] Further, the oil-repellent matrix elastic porous filler is a 7 - 11 ppi modified oil-repellent polyurethane sponge filler, with L×B×H = 3×3×3 mm.

[0022] Further, the specifications of the biological film hanging module are L×B×H = 0.75×0.75×0.75 m, 1250 pieces / module.

[0023] Further, the material used for the hanging lock is of the stainless steel type.

[0024] Further, the reflux ratio of the activated sludge reflux is 120 - 150%.

[0025] Further, the heavy carrier of the activated sludge method is a mixture of 0.075 mm activated carbon, 0.45 mm activated carbon and 3.35 Pa·S chitosan, mixed in a mass ratio of 6:3:1.

[0026] Further, when the heavy carrier of the activated sludge method and the heavy oil sewage are mixed, the dosage of the heavy carrier is 525 - 665 mg / L.

[0027] The beneficial effects of the present invention compared with the prior art are:

[0028] After the heavy oil sewage is treated by the synergistic process of heavy sludge and biological film hanging, colloids, asphaltenes, etc. form activated sludge through the adsorption of heavy components, and some dissolved components form nutrients that are absorbed or decomposed by microorganisms. The biofilm strengthens the filtration and adsorption function of the heavy components, and the outer biofilm also degrades pollutants. The middle and inner biofilms carry out anaerobic denitrification to decompose long-chain and cyclic carbon-chain organic substances, increasing the biochemical oxygen demand. Description of the Drawings

[0029] The present invention will be further described below in conjunction with the drawings and embodiments.

[0030] Appendix Figure 1 is the process flow diagram of the collaborative process of activated carbon sludge and biochemical film hanging for heavy oil sewage;

[0031] Appendix Figure 2 is the underwater aeration device diagram of the collaborative process of activated carbon sludge and biochemical film hanging for heavy oil sewage;

[0032] Appendix Figure 3 is the schematic diagram of the change in the aeration method of the collaborative process of activated carbon sludge and biochemical film hanging for heavy oil sewage;

[0033] Appendix Figure 4 is the top view of the monomer structure of the collaborative process of heavy sludge and biological film hanging for heavy oil sewage.

[0034] Among them, 1. water inlet end, 2. ejector, 3. jet orifice, 4. mixing chamber, 5. diffuser tube, 6. connecting pipe, 7. steel pipeline, 8. hydraulic impact culvert, 9. hydraulic impact self-rotating gear, 10. gravity attenuation spring, 11. hydraulic impact chamber. Specific embodiments

[0035] For a clearer understanding of the technical features, objectives, and beneficial effects of the present invention, the following detailed description of the technical solution of the present invention is provided in combination with the following specific embodiments, but it should not be construed as a limitation on the implementable scope of the present invention. Unless otherwise specified, the experimental methods used in the present invention are all conventional methods, and the experimental equipment, materials, reagents, etc. used can be obtained from commercial channels.

[0036] The embedding form of the prior art is: embedding the membrane process components into the activated sludge method, and forming a new process by adjusting parameters and process layout.

[0037] Pollutants in sewage exist in the water body in the forms of dissolution, emulsification, dispersion, etc. The biodegradable components in organic matter can be regarded as the food source of sewage treatment microorganisms. The activated sludge method belongs to a type of aerobic process, and its treatment effect on long-chain aliphatic hydrocarbons, cycloalkanes, and aromatic hydrocarbons is not ideal; the microbial film hanging method also belongs to an aerobic process, with less sludge volume and strong adaptability to changes in water volume and quality. The collaborative process of heavy sludge and biological film hanging for heavy oil sewage is to embed filamentous / spherical biofilms into the heavy activated sludge process structure, and through the combination of the heavy activated sludge method and the biological film hanging method, the heavy oil sewage is systematically treated. The heavy activated sludge mainly contains heterotrophic microorganisms, while the filamentous film mainly contains autotrophic microorganisms and fungi, etc. The two constitute a relatively complete microbial community for heavy oil sewage treatment. The main characteristics of the microbial community for heavy oil sewage treatment are:

[0038] (1) The types of sewage treatment microorganisms are relatively complete, including fungi, bacteria, protozoa, micro-plants, mosses, etc.

[0039] (2) It has the dual advantages of the activated sludge process and biological film hanging, and has strong resistance to fluctuations in water quality and quantity.

[0040] (3) In the heavy activated sludge process, filamentous film hanging is adopted, which can reduce the dosage of heavy components.

[0041] (4) The removal effect of various pollutants by diverse microorganisms is enhanced.

[0042] The self-priming dissolved air pump of the present invention draws the heavy return activated sludge of the biochemical system, and at the same time dissolves air to form an aerated water body. Through the pipeline connection method, it is pumped into each underwater jet aeration device by pump pressure. The underwater jet aeration device sprays the dissolved air water through the aperture to complete the aeration process. During the underwater jet process of the high-speed and high-pressure dissolved air water, the water flow radiates horizontally, and the small-aperture gas dissipates vertically, forming agitation between the gas buoyancy and the high-speed fluid, completing the biochemical process return, and at the same time preventing the deposition of heavy activated carbon sludge. The deposited part can return to the flowing state under the mode of increasing hydraulic impact.

[0043] The main equipment and technical parameters of the present invention are as follows:

[0044] Hydraulic retention time is 13 - 15 h, COD load is 10.8 - 16.8 kg / (m 3 ·d), liquid phase pH value is 7.0 - 7.5, water temperature is 25 - 30 °C, dissolved oxygen is 6 - 8 mg / L, reflux ratio is 120 - 135%, suspended sludge concentration is 11000 - 13000 mg / L, film hanging filling ratio is 35 - 48%, and heavy carrier dosage concentration is 400 - 650 mg / L.

[0045] The main equipment and facilities are: the biochemical reaction tank is equipped with a propulsion pump group and a reflux pump group, a blower aeration device, an oil-repellent matrix elastic porous filler, a heavy carrier dosing device, etc.

[0046] Example 1

[0047] The underwater aeration device of the collaborative process of viscous oil sewage activated carbon sludge and biochemical film hanging was improved after the mixing chamber 4. The main improvement is to utilize the residual water pressure to impact the subsequent self-rotating structure for automatic rotation. The main body steam-water mixture is split from the mixing chamber 4 and enters the jet orifice 3 for jet aeration. The whole casting of the aeration device, after being processed by a lathe, the base is generally connected by bearings and can rotate. The conical hydraulic impact culvert 8 is connected by flanges. The gravity attenuation spring 10 and the hydraulic impact self-rotating gear 9 are connected by threads. It is recommended to connect the water inlet end 1 and the jet device 2 by flanges, and direct welding is not recommended.

[0048] While transporting heavy activated sludge medium, the jet pump group sucks in air through self-priming, mixes it into the heavy return sludge, forms a three-phase mixture of gas, water, and heavy sludge, and enters each aeration device batch by batch and group by group through pipeline connection and flow control by valves. When the water flow impacts and rotates the hydraulic impact culvert 8, it drives the hydraulic impact self-rotating gear 9 to rotate 360° cyclically by itself, determines the diameter of aeration bubbles through the aperture of the aeration device, and conducts reflux and aeration.

[0049] Example 2

[0050] In view of the biochemical characteristics of heavy oil sewage, the present invention utilizes the developed heavy carrier of activated sludge method, the main components are 0.075mm activated carbon, 0.45mm activated carbon and 3.35Pa·S deacetylated chitin, and the mass ratio is 6:3:1. The heavy carrier and heavy oil sewage are mixed according to the proportion of the simulated experimental gradient regression curve, and the dosage of the heavy carrier is 525 - 665mg / L. By changing the structure of the activated sludge in heavy oil sewage to make it transform into a colloidal structure, it can be evenly distributed in heavy oil sewage, avoiding the impact of water body particles on the biological film hanging process; hanging oleophobic matrix elastic porous fillers in the heavy carrier activated sludge, preferably 7 - 11ppi modified oleophobic polyurethane sponge fillers, L×B×H = 3×3×3mm, and under the same water quality conditions as the activated sludge process, the synergistic process of heavy sludge and biological film hanging in heavy oil sewage is completed.

[0051] When not in operation, biological film hanging modules are set in the first corridor of each group in the first-stage biochemical system. The specifications of the modules are L×B×H = 0.75×0.75×0.75m, 1250 pieces / module, 0.5m below the liquid level, and the module combination starts to be set 0.8m away from the side wall, with a row spacing of 1m and a column spacing of 1.5m. The hanging lock is made of corrosion-resistant stainless steel material. The sewage enters the first-stage biochemical system through a lift pump. At the initial operation, 700m / L of heavy carrier is directly added while the water is entering until the sludge concentration reaches about 8500mg / L. At the same time, activated sludge reflux is carried out, with a reflux ratio of 120 - 150%, and the discharge of excess sludge is 1.2 - 1.5 times the dosage of activated carbon. A synergistic process layout with double carriers of heavy carrier and biological film hanging is formed, enhancing the contact area between microorganisms and water, enhancing the biological treatment capacity, ensuring that the effluent of the first-stage biochemical system is 100 - 130mg / L, and then passing through the adsorption and filtration of the second-stage biochemical system and finally meeting the standards for external discharge.

[0052] Example 3

[0053] In July 2021, a submerged aeration device and its treatment method for the synergistic process of heavy sludge and biological film hanging in heavy oil sewage were built in the sewage treatment brigade of Shuguang Oil Production Plant. The designed treatment capacity of this process is 380m 3 / h. After the process was put into operation, the dosage of activated carbon decreased from 750 mg / L to 650 mg / L, and the chemical oxygen demand in the liquid phase decreased from 150 mg / L to 125 mg / L.

[0054] This technical solution consists of a first-stage biochemical system composed of three groups of parallel biochemical ponds (9 corridors, with a total of 8100 m 3 ), which are connected in series with a second-stage biochemical pond (3 corridors, with a total of 2700 m 3 ). The distance between the biofilm carrier boxes (L×B×H = 1.5×2.5×4.5 m) in the first-stage biochemical pond is 7.5 m, and the carrier is a plastic porous sponge filler (L×B×H = 4.5×4.5×4.5 cm, with a density of 0.84 mg / cm 3 ). The reflux ratio of the biochemical system is 125%, the hydraulic retention time is 14.5 h, the COD load is 15.1 kg / (m 3 ·d), the pH value of the liquid phase is 7.5, the water temperature is 30 °C, the dissolved oxygen is 7.5 mg / L, the concentration of suspended sludge is 11000 - 13000 mg / L, the filling ratio of the biofilm is 42%, and the dosing concentration of the heavy carrier is 630 mg / L.

[0055] The above-described embodiments are only the preferred embodiments of the present invention, and not all the feasible embodiments of the present invention. For those of ordinary skill in the art, any obvious changes made without departing from the principle and spirit of the present invention should be considered to be included within the scope of the claims of the present invention.

Claims

1. Submerged aeration device for the collaborative process of activated carbon sludge and biochemical film formation in heavy oil sewage, characterized in that, The water inlet end (1) is flange-connected to the injector (2). One end of the steel pipeline (7) is connected to the injector (2) through a flange, and the other end is gear-connected to the hydraulic impact chamber (11). One end of the diffuser tube (5) is connected to the mixing chamber (4) through a pipeline, and the other end is connected to the connecting pipe (6) through a pipeline. The hydraulic impact chamber (11) is provided with a hydraulic impact self-rotating gear (9). The hydraulic impact self-rotating gear (9) is provided with a hydraulic impact duct (8). The gravity attenuation spring (10) is thread-connected to the hydraulic impact self-rotating gear (9). The main body steam-water mixture is shunted from the mixing chamber (4) into the jet orifice (3) for spraying, and successively enters the hydraulic impact chamber (11) through the diffuser tube (5) and the connecting pipe (6) from the mixing chamber (4).

2. The aeration method of the underwater aeration device for the synergistic process of heavy oil sewage activated carbon sludge and biochemical film formation according to claim 1, characterized in that, The main body steam-water mixture is shunted from the mixing chamber (4) into the jet orifice (3) for spraying, and successively enters the hydraulic impact chamber (11) through the diffuser tube (5) and the connecting pipe (6) from the mixing chamber (4). When impacting the hydraulic impact duct (8), the hydraulic impact duct (8) drives the hydraulic impact self-rotating gear (9) to rotate for spraying.

3. Using the aeration method of the underwater aeration device for the synergistic process of heavy oil sewage activated carbon sludge and biochemical film formation according to claim 1, characterized in that, The vertical buoyancy aeration is changed to parallel jet aeration. The aeration device is evenly laid in the pool body. The aeration volume and the reflux ratio are controlled by the valve opening or the flowmeter reading. The parallel water flow and air flow are used for aeration and reflux, and at the same time, the heavy activated sludge is impacted to make it in a flowing state.

4. The treatment method of the underwater aeration device for sewage treatment by the synergistic process of heavy oil sewage activated carbon sludge and biochemical film formation as claimed in claim 1, characterized in that, in Biological film hanging modules are arranged in the first corridor of each group of the first-stage biochemical treatment. The module combination starts to be set 0.5 m below the liquid level and 0.8 m away from the side wall. The row spacing is 1 m, and the column spacing is 1.5 m. The hanging lock is made of corrosion-resistant material. The sewage enters the first-stage biochemical system through the lift pump. During the initial operation, the heavy carrier of the activated sludge process and the viscous oil sewage are directly mixed according to the proportion of the simulated experimental gradient regression curve when the water enters. Oleophobic matrix elastic porous fillers are hung in the heavy carrier activated sludge, and at the same time, the activated sludge is refluxed. The discharge amount of the surplus sludge is 1.2 - 1.5 times the amount of the activated carbon put in, forming a synergistic process layout with double carriers of the heavy carrier and the biological film hanging, enhancing the contact area between microorganisms and water, enhancing the biological treatment capacity, ensuring that the liquid-phase chemical oxygen demand of the effluent from the first-stage biochemical treatment is 100 - 130 mg / L, and then passing through the adsorption and filtration of the second-stage biochemical system and finally meeting the standards for external discharge.

5. The treatment method for sewage treatment using the underwater aeration device of the synergistic process of heavy oil sewage activated carbon sludge and biochemical film hanging as described in claim 4, characterized in that, The oleophobic matrix elastic porous filler is a 7 - 11 ppi modified oleophobic polyurethane sponge filler with L×B×H = 3×3×3 mm.

6. The treatment method of the underwater aeration device for sewage treatment by the synergistic process of heavy oil sewage activated carbon sludge and biochemical film formation as claimed in claim 4, characterized in that The specification of the biological film hanging module is L×B×H = 0.75×0.75×0.75 m, and each module contains 1250 oleophobic matrix elastic porous fillers.

7. The treatment method for sewage treatment using the underwater aeration device of the synergistic process of heavy oil sewage activated carbon sludge and biochemical film formation according to claim 4, characterized in that, The material used for the hanging lock is stainless steel.

8. The treatment method for sewage treatment using the underwater aeration device of the heavy oil sewage activated carbon sludge and biochemical film hanging synergistic process according to claim 4, characterized in that, The reflux ratio of the activated sludge reflux is 120 - 150%.

9. The treatment method of sewage treatment using the underwater aeration device of the synergistic process of heavy oil sewage activated carbon sludge and biochemical film hanging as described in claim 4, characterized in that, The heavy carrier of the activated sludge process is a mixture of 0.075 mm activated carbon, 0.45 mm activated carbon and 3.35 Pa·S deacetylated chitin in a mass ratio of 6:3:

1.

10. The treatment method of the underwater aeration device for sewage treatment by the synergistic process of heavy oil sewage activated carbon sludge and biochemical film hanging as described in claim 4, characterized in that, When the heavy carrier of the activated sludge process and the viscous oil sewage are mixed, the dosage of the heavy carrier is 525 - 665 mg / L.

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