Efficient biological filter for deep standard treatment of petrochemical wastewater
By adopting biological filter technology in petrochemical wastewater treatment, using biological filter materials and screens to build efficient bacterial communities, and combining purge fluidization and oxygen supply devices, the problem of petrochemical enterprises' difficulty in meeting wastewater treatment standards has been solved, and efficient and low-cost wastewater treatment effects have been achieved.
Patent Information
- Application Number
- CN202421802405.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-26
- Publication Date
- 2025-10-28
- Estimated Expiration
- 2034-07-26
AI Technical Summary
Existing wastewater treatment processes in petrochemical enterprises are difficult to meet strict environmental protection requirements, especially for high-salt, high-biodegradability wastewater, which has poor treatment effects. Traditional methods also have problems of secondary pollution and high costs.
The high-efficiency biological filter technology is adopted. By setting biological filter materials and screens in the reaction tank, high-efficiency bacteria are used to remove difficult-to-degrade organic matter in the sewage. Combined with the purge fluidizer and oxygen supply nozzle, the fluidization of the biological filter materials and the oxygen supply are ensured to form an efficient pollutant removal system.
It achieves efficient removal of difficult-to-degrade organic matter in sewage, reduces operating costs, avoids secondary pollution, meets drainage water quality requirements, and improves treatment efficiency.
Smart Images
Figure CN223480917U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of wastewater treatment, and in particular to a highly efficient biological filter for deep treatment of petrochemical wastewater to meet emission standards. Background Technology
[0002] The petrochemical industry is one of my country's important economic pillars, but the production process inevitably generates various types of wastewater. As early as 2015, the chemical industry ranked first in my country in terms of total wastewater discharge. With the increasing emphasis on environmental protection by the state, the requirements for suspended solids, COD, ammonia nitrogen, and other indicators in the wastewater discharged from the Beijing-Tianjin-Hebei region have become more stringent. Wastewater must undergo advanced treatment to meet the Class IV surface water standard. The original wastewater treatment processes of refining and chemical enterprises are no longer sufficient to meet the environmental protection requirements under the new circumstances.
[0003] After traditional "oil separation + flotation + biological treatment + sedimentation" processes, the nutrient ratio in the wastewater becomes imbalanced, and the remaining organic matter is difficult to degrade. Meanwhile, wastewater with high salinity and poor biodegradability, such as circulating water discharge, chemically neutralized water, and reverse osmosis concentrate, also adversely affect the biological treatment system after entering the wastewater treatment plant. Currently, refining and chemical enterprises mostly use technologies such as ozone catalytic oxidation and electrochemical treatment to improve the biodegradability of wastewater, facilitating subsequent biological treatment. However, ozone catalytic oxidation is prone to causing secondary environmental pollution, and the above two methods suffer from high power consumption or high equipment costs, resulting in high treatment costs. Utility Model Content
[0004] In view of this, this application proposes a highly efficient biological filter for deep treatment of petrochemical wastewater, which enables the activated native bacteria to build a rich and efficient bacterial community within the biological filter media, thereby removing recalcitrant organic matter from the wastewater and improving the efficiency of the biochemical reaction.
[0005] According to one aspect of this application, a highly efficient biological filter for advanced treatment of petrochemical wastewater is provided, comprising: a reaction tank, biological filter media, and a screen.
[0006] The reaction tank has a hollow internal structure, and both the screen and the biological filter media are installed inside the reaction tank. The screen is laid inside the reaction tank and matches the inner wall of the reaction tank. The biological filter media is installed inside the screen. The water inlet of the reaction tank is located near the top of the reaction tank and is suitable for connecting to the water inlet. A water distribution pipe is installed inside the reaction tank. One end of the water distribution pipe is connected to the water inlet of the reaction tank, and the other end is connected to the bottom of the biological filter media.
[0007] In one possible implementation, the method further includes a purge fluidizer disposed between the screen and the biofilter media, and the purge fluidizer is adapted to be connected to an air inlet.
[0008] In one possible implementation, it further includes: an oxygen supply nozzle, which is laid near the bottom of the reaction tank and is adapted to be connected to an air inlet.
[0009] In one feasible approach, the biological filter media is spaced at a predetermined distance from the top and bottom of the reaction tank, and the ratio of the thickness of the biological filter media to the height of the reaction tank is 1:10-1:2.
[0010] In one possible implementation, the inlet of the reaction tank is positioned at a height higher than the screen, and the outlet of the reaction tank is positioned at a height lower than the inlet of the reaction tank.
[0011] In one possible implementation, a water distribution channel is provided at the top inner side of the reaction tank, and the water inlet is connected to the water distribution channel through the water inlet of the reaction tank.
[0012] In one possible implementation, the water distribution pipe is a straight pipe structure, the water distribution pipe is connected to the water distribution channel, and the water distribution pipe is vertically installed at the bottom of the water distribution channel, with one end connected to the bottom of the water distribution channel.
[0013] In one feasible embodiment, the water distribution channel is a cuboid trough structure, and the ratio of the height of the water distribution channel to the height of the reaction tank is 1:10-1:6.
[0014] In one feasible approach, the number of the efficient petrochemical wastewater deep treatment biological filters is multiple; the reaction tank has a cuboid structure, and the inlet and outlet of the reaction tank are located on opposite sides. When the number of the efficient petrochemical wastewater deep treatment biological filters is multiple, the outlet of the front reaction tank can be positioned opposite the inlet of the rear reaction tank.
[0015] In one possible implementation, a first valve is provided on the pipeline between the water inlet and the water inlet of the reaction tank, a second valve is provided between the air inlet and the purging fluidizer, and a third valve is provided between the air inlet and the oxygen supply nozzle.
[0016] The beneficial effects of this application are as follows: During operation, petrochemical wastewater first enters the reaction tank through the inlet. The inlet is connected to a distribution pipe, which guides the petrochemical wastewater to the bottom of the reaction tank, forming an upward flow of the wastewater. The biological filter media is fixed in the middle of the biological filter through a screen, forming a filter layer. In this section, the petrochemical wastewater and the biological filter media are in full contact. The pollutants in the wastewater and the dissolved oxygen in the water have full contact and mass transfer with the biofilm on the surface of the biological filter media. Under the action of highly efficient bacteria, the pollutants are effectively removed. According to this application, a highly efficient petrochemical wastewater deep treatment biological filter has a simple overall structure and low operating cost. The surface of the packing material is enriched with highly efficient bacteria, which can remove recalcitrant organic matter in the wastewater and will not cause secondary pollution during the treatment process.
[0017] Other features and aspects of this application will become clear from the following detailed description of exemplary embodiments with reference to the accompanying drawings. Attached Figure Description
[0018] The accompanying drawings, which are included in and form part of this specification, illustrate exemplary embodiments, features, and aspects of this application together with the specification and serve to explain the principles of this application.
[0019] Figure 1 This diagram shows a cross-sectional view of a highly efficient biofilter for deep treatment of petrochemical wastewater according to an embodiment of this application. Detailed Implementation
[0020] Various exemplary embodiments, features, and aspects of this application will now be described in detail with reference to the accompanying drawings. The same reference numerals in the drawings denote elements that have the same or similar functions. Although various aspects of the embodiments are shown in the drawings, they are not necessarily drawn to scale unless specifically indicated otherwise.
[0021] It should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this application or to simplify the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.
[0022] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. Throughout the description of this application, "plurality" means two or more, unless otherwise specifically defined.
[0023] The term “exemplary” as used herein means “serving as an example, embodiment, or illustration.” Any embodiment illustrated herein as “exemplary” is not necessarily to be construed as superior to or better than other embodiments.
[0024] Furthermore, to better illustrate this application, numerous specific details are provided in the following detailed embodiments. Those skilled in the art should understand that this application can be implemented without certain specific details. In some instances, methods, means, components, and circuits well-known to those skilled in the art have not been described in detail in order to highlight the main points of this application.
[0025] like Figure 1 As shown, this highly efficient petrochemical wastewater deep treatment biological filter includes: a reaction tank 100, biological filter media 200, and a screen 300.
[0026] The reaction tank 100 has a hollow internal structure, and both the screen 300 and the biological filter media 200 are installed inside the reaction tank 100. The screen 300 is laid inside the reaction tank 100 and matches the inner wall of the reaction tank 100. The biological filter media 200 is installed inside the screen 300. The water inlet of the reaction tank 100 is located near the top of the reaction tank 100 and is suitable for connecting to the water inlet. A water distribution pipe 410 is installed inside the reaction tank 100. One end of the water distribution pipe 410 is connected to the water inlet of the reaction tank 100, and the other end is connected to the bottom of the biological filter media 200.
[0027] During operation, petrochemical wastewater first enters the distribution channel 420 at the top of the biological filter, and then flows into the lower part of the biological filter through the distribution pipe 410 at the bottom of the distribution channel 420. The wastewater then flows upwards, and the biological filter media 200 is fixed in the middle of the reaction tank 100 by the intercepting screen 300, forming a filter layer. In this layer, the wastewater and the biological filter media 200 are in full contact, allowing for thorough contact and mass transfer between pollutants in the wastewater and dissolved oxygen in the water and the biofilm on the surface of the biological filter media 200. Under the action of highly efficient bacteria, pollutants are effectively removed. Depending on the pollutant removal requirements and site requirements, single-stage or multi-stage high-efficiency biological filters can be installed in series. Figure 1As shown, this is a two-stage biological filter operating in series. In multi-stage series operation, the effluent from the previous stage reaction tank 100 enters the water distribution channel 420 of the next stage reaction tank 100, and flows into the bottom of the biological filter through the water distribution pipe 410 at the bottom of the water distribution channel 420. Furthermore, to fully fluidize the biological filter media 200 and prevent it from caking or clogging, an air purging fluidization device is installed between the filter media layer and the intercepting screen 300, using compressed air to powerfully purge the filter media layer.
[0028] In one possible implementation, a purge fluidizer 510 is also included, which is laid between the screen 300 and the biofilter media 200 and is adapted to be connected to the air inlet. The purge fluidizer 510 is used to purge the biofilter media to prevent it from clogging at the bottom of the screen 300, thereby slowing down the reaction rate.
[0029] In one possible implementation, it also includes: an oxygen supply nozzle 520, which is laid near the bottom of the reaction tank 100 and is adapted to be connected to an air inlet. The oxygen supply nozzle 520 provides oxygen to the reaction tank 100, thereby ensuring that the biological reactor 200 can operate normally.
[0030] In one feasible approach, there is a preset distance between the biological filter media 200 and the top and bottom of the reaction tank 100. The ratio of the thickness of the biological filter media 200 to the height of the reaction tank 100 is 1:10-1:2. The thickness of the biological filter media 200 can be flexibly added according to actual needs. The filling rate of the biological filter media 200 can easily affect the overall removal rate of the reaction. If the filling rate of the biological filter media 200 is high, it will increase the cost.
[0031] In one feasible embodiment, the inlet of the reaction tank 100 is set at a height higher than that of the screen 300, and the outlet of the reaction tank 100 is set at a height slightly lower than that of the inlet of the reaction tank 100. The screen 300 is used to control the biological filter media 200 at the middle position in the height direction of the reaction tank 100 to prevent it from drifting in the water and affecting the treatment rate.
[0032] In one feasible embodiment, a water distribution channel 420 is provided at the top inner side of the reaction tank 100, and the water inlet is connected to the water distribution channel 420 through the water inlet of the reaction tank 100, such as... Figure 1 As shown, a row of water distribution channels 420 is arranged along the depth direction to balance and control the incoming water to maintain stability.
[0033] In one feasible embodiment, the water distribution pipe 410 is a hollow straight pipe structure, which is connected to the water distribution channel 420 and is vertically installed at the bottom of the water distribution channel 420. One end of the water distribution pipe 410 is connected to the bottom of the water distribution channel 420. The water distribution pipe 410 is used to directly guide sewage to the bottom of the biological filter media 200.
[0034] In one feasible embodiment, the water distribution channel 420 is a cuboid trough structure, and the ratio of the height of the water distribution channel 420 to the height of the reaction tank 100 is 1:10-1:6.
[0035] In one feasible approach, there are multiple efficient biofilters for advanced treatment of petrochemical wastewater; the reaction tank 100 has a cuboid structure, and the inlet and outlet of the reaction tank 100 are located on opposite sides. When there are multiple efficient biofilters for advanced treatment of petrochemical wastewater, the outlet of the front reaction tank 100 can be positioned opposite the inlet of the rear reaction tank 100.
[0036] In one feasible embodiment, a first valve 610 is installed on the pipeline between the water inlet and the water inlet of the reaction tank 100, a second valve 620 is installed between the air inlet and the purging fluidizer 510, and a third valve 630 is installed between the air inlet and the oxygen supply nozzle 520.
[0037] This application is applicable to the advanced treatment of petrochemical high-salinity and recalcitrant wastewater, and can meet the effluent quality requirements within a certain range of influent water quality. Addressing the issues of toxicity inhibition and nutritional deficiencies of functional microorganisms in petrochemical wastewater, a microbial activator will be designed and configured to enhance the metabolic activity of functional microorganisms. To address the problem of easy loss of functional microorganisms, a special new type of lightweight porous filter media will be used, offering technical advantages unmatched by ordinary filter media, such as high microbial adhesion rate and high pollutant mass transfer efficiency. Therefore, by employing a high-efficiency filter media carrier and functional bacterial activator, we will construct a high-efficiency biofilter technology, increasing the concentration and purity of highly active microbial cells within the bioreactor. This results in less sludge, high solid-liquid separation efficiency, high pollutant removal efficiency, and increased tolerance and shock resistance of microorganisms to toxic substances. This application immobilizes highly efficient functional bacteria in a special biological filter media 200, forming a dominant bacterial community, which can significantly improve the removal efficiency under high-salinity and recalcitrant water conditions.
[0038] The biological filter media 200 of this application is compared with the currently widely used "ozone catalysis + aerated biological filter" technology, as shown in the table below:
[0039]
[0040]
[0041] Compared to ozone-aerated biological filters, high-efficiency biological filters are a type of high-efficiency bioreactor with low operating costs specifically designed for the removal of recalcitrant organic matter. They feature rapid start-up and biofilm formation, tolerance to high-salt wastewater, and simple operation and maintenance management.
[0042] It should be noted that although this application has been used as an example to describe a highly efficient biological filter for advanced treatment of petrochemical wastewater, those skilled in the art will understand that this application is not limited to this. In fact, users can flexibly set various parameters according to their personal preferences and / or actual application scenarios, as long as the design is reasonable.
[0043] In this way, during operation, petrochemical wastewater first enters the reaction tank through the inlet, which is connected to a distribution pipe. The distribution pipe guides the petrochemical wastewater to the bottom of the reaction tank, forming an upward flow of the wastewater. The biological filter media is fixed in the middle of the biological filter through a screen, forming a filter media layer. In this section, the petrochemical wastewater and the biological filter media are in full contact. The pollutants in the wastewater and the dissolved oxygen in the water have sufficient contact and mass transfer with the biofilm on the surface of the biological filter media. Under the action of highly efficient bacteria, the pollutants are effectively removed. According to this application, a highly efficient petrochemical wastewater deep treatment biological filter has a simple overall structure and low operating cost. The surface of the packing material is enriched with highly efficient bacteria, which can remove recalcitrant organic matter in the wastewater and will not cause secondary pollution during the treatment process.
[0044] The various embodiments of this application have been described above. These descriptions are exemplary and not exhaustive, nor are they limited to the disclosed embodiments. Many modifications and variations will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments. The terminology used herein is chosen to best explain the principles, practical application, or improvement of the technology in the market, or to enable others skilled in the art to understand the embodiments disclosed herein.
Claims
1. A highly efficient biological filter for deep treatment of petrochemical wastewater, characterized in that, include: Reaction tank, biological filter media, and screens; The reaction tank has a hollow internal structure, and the screen and the biological filter media are both installed inside the reaction tank. The screen is laid inside the reaction tank and matches the inner wall of the reaction tank; the biological filter material is placed inside the screen. The inlet of the reaction tank is located near the top of the reaction tank and is suitable for connecting to the water inlet. A water distribution pipe is installed inside the reaction tank. One end of the water distribution pipe is connected to the water inlet of the reaction tank, and the other end is connected to the bottom of the biological filter media.
2. The high-efficiency biological filter for advanced treatment of petrochemical wastewater according to claim 1, characterized in that, Also includes: A purge fluidizer is laid between the screen and the biofilter media, and the purge fluidizer is adapted to be connected to the air inlet.
3. The high-efficiency biological filter for advanced treatment of petrochemical wastewater according to claim 1, characterized in that, Also includes: An oxygen supply nozzle is installed near the bottom of the reaction tank and is suitable for connection to the air inlet.
4. The high-efficiency biological filter for advanced treatment of petrochemical wastewater according to any one of claims 1-3, characterized in that, The biological filter media is spaced at a predetermined distance from the top and bottom of the reaction tank, and the ratio of the thickness of the biological filter media to the height of the reaction tank is 1:10-1:
2.
5. The high-efficiency biological filter for deep treatment of petrochemical wastewater according to claim 4, characterized in that, The inlet of the reaction tank is set at a height higher than the screen, and the outlet of the reaction tank is set at a height lower than the inlet of the reaction tank.
6. The high-efficiency biological filter for deep treatment of petrochemical wastewater according to claim 4, characterized in that, A water distribution channel is provided at the top inner side of the reaction tank, and the water inlet is connected to the water distribution channel through the water inlet of the reaction tank.
7. The high-efficiency biological filter for deep treatment of petrochemical wastewater according to claim 6, characterized in that, The water distribution pipe is a straight pipe structure. The water distribution pipe is connected to the water distribution channel and is vertically installed at the bottom of the water distribution channel, with one end connected to the bottom of the water distribution channel.
8. The high-efficiency biological filter for deep treatment of petrochemical wastewater according to claim 7, characterized in that, The water distribution channel is a rectangular trough structure, and the ratio of the height of the water distribution channel to the height of the reaction tank is 1:10-1:
6.
9. The high-efficiency biological filter for advanced treatment of petrochemical wastewater according to any one of claims 1-3, characterized in that, The number of high-efficiency petrochemical wastewater deep treatment biological filters is multiple; The reaction tank has a cuboid structure, and the inlet and outlet of the reaction tank are located on opposite sides. When there are multiple high-efficiency petrochemical wastewater deep treatment biological filters, the outlet of the front reaction tank can be set opposite to the inlet of the rear reaction tank.