A biological oil separator

Abstract

This application relates to the technical field of wastewater treatment and discloses a biological oil-water separator, including a tank, a biological bacteria dosing system, an aeration system, and a control system. The tank contains a primary separation chamber, an oil-water separation chamber, and a clean water discharge chamber. The primary separation chamber is used for primary filtration of wastewater; the oil-water separation chamber is used for separating oil and water in the wastewater to obtain clean water; the clean water discharge chamber is used for storing and discharging clean water; the biological bacteria dosing system is used to add biological bacteria to the oil-water separation chamber; the aeration system generates bubbles through periodic aeration, promoting the degradation of grease by the biological bacteria; the control system is used to control the start and stop of the aeration system, the aeration energy, and the dosage and frequency of the biological bacteria dosing system. This invention can achieve efficient separation and decomposition of grease in wastewater, reduce the amount of sludge and scum produced, improve wastewater treatment efficiency, and reduce maintenance frequency.

Description

Technical Field

[0001] This application relates to the technical field of wastewater treatment, specifically to a biological oil-water separator. Background Technology

[0002] Traditional oil-water separators primarily rely on gravity settling, causing grease, which is less dense than water, to float to the surface, where it is then skimmed off manually or mechanically. This method has several drawbacks. For tiny oil droplets such as emulsified and dispersed oils, gravity separation is ineffective, resulting in high oil content in the effluent and incomplete oil-water separation. Food scraps, suspended solids, and other solid waste that enter with the wastewater tend to accumulate at the bottom and inside the equipment, not only occupying valuable space but also becoming new sources of pollution, requiring frequent cleaning and incurring high maintenance costs. Grease removal is also difficult: floating grease needs to be regularly retrieved, and the disposal of the removed grease and solid waste is quite troublesome. While some existing technologies utilize biodegradation or aeration-assisted methods, these often suffer from inappropriate aeration methods, such as high energy consumption from continuous aeration or aeration disturbance affecting oil layer stability, leading to low treatment efficiency and unstable results. Furthermore, existing biological agents are often added at fixed amounts and frequencies, preventing on-demand addition and resulting in resource waste or insufficient oil removal.

[0003] For example, Chinese Patent CN204661515U discloses a multi-stage filtration oil separator, including a coarse filter, a U-shaped connecting pipe, a fine filter, an L-shaped connecting pipe, a biological treatment device, and an outlet pipe connected in sequence. The fine filter includes a fine filter tank, which is divided into a primary fine filter tank and a secondary fine filter tank by a first oil sludge baffle with internal perforations. Oil-absorbing layers are provided on both sides of the first oil sludge baffle. The biological treatment device includes a biological treatment tank, which is divided into a primary biological treatment tank and a secondary biological treatment tank by a second oil sludge baffle with internal perforations. Oil-absorbing layers are provided on both sides of the second oil sludge baffle. An oil floater is provided in the secondary biological treatment tank. The L-shaped connecting pipe includes a vertical pipe located in the secondary fine filter tank and a horizontal pipe connected to the upper end of the secondary fine filter tank and the biological treatment tank and communicating with the vertical pipe. The lower part of the vertical pipe is open, and its lower opening is located at the lower end of the secondary fine filter tank.

[0004] Chinese patent application CN108996837A discloses an oil-water separation and purification system for domestic sewage, including a screen tank for filtering large particulate impurities in the sewage; an oil separator for separating oil from the sewage, comprising a tank body; a partition plate disposed within the tank body for dividing the tank body into a first separation tank and a second separation tank; an air flotation device for aerating gas into the first separation tank to generate bubbles; a flocculation device for flocculating small particulate impurities in the sewage into large particulate impurities; a sedimentation tank for settling the flocculated sewage; a biological oxidation tank for purifying the sewage after sedimentation; and a disinfection tank for disinfecting the purified water. This solution can remove impurities from sewage, thereby reducing the amount of impurities in the water entering the oxidation tank, reducing the workload of the oxidation tank, saving reaction time, and improving work efficiency.

[0005] All of the above technical solutions suffer from the problem mentioned in the background of this application: the inability to add the appropriate degreasing agent as needed leads to resource waste or insufficient degreasing effect.

[0006] The information disclosed in this background section is intended only to enhance the understanding of the overall background of this application and should not be construed as an admission or in any way implying that the information constitutes prior art known to those skilled in the art. Summary of the Invention

[0007] The technical problem to be solved by this application is to overcome the defects of the prior art and provide a biological oil-water separator that can achieve efficient separation and decomposition of oil in sewage, reduce the amount of sludge and scum generated, improve sewage treatment efficiency and reduce maintenance frequency.

[0008] To solve the above-mentioned technical problems, this application provides the following technical solution:

[0009] A biological oil-water separator includes a housing, a biological inoculation system, and an aeration system; the housing is equipped with a primary separation chamber, an oil-water separation chamber, and a clean water discharge chamber.

[0010] The primary separation chamber is used for primary filtration of wastewater; the oil-water separation chamber is used for separating oil and water from wastewater to obtain clean water; and the clean water discharge chamber is used for the storage and discharge of clean water.

[0011] The biological bacteria dosing system is used to add biological bacteria to the oil-water separation chamber; the aeration system generates bubbles through timed aeration, and the bubbles adhere to the oil in the wastewater, causing the oil to float to the water surface and be degraded by the biological bacteria.

[0012] The biological oil separator also includes a control system; the control system is used to calculate the aeration effectiveness index and control the start-up and shutdown of the aeration system and the aeration energy based on the aeration effectiveness index; the control system also controls the dosage and frequency of the biological bacteria feeding system based on the aeration effectiveness index.

[0013] As a preferred embodiment of the biological oil-water separator described in this application, the clean water discharge chamber is provided with a water outlet for discharging the clean water obtained after oil-water separation.

[0014] The primary separation chamber is equipped with an inlet and a filter screen; the inlet is used to introduce wastewater into the primary separation chamber; the filter screen is used to filter solid particles in the wastewater.

[0015] The oil-water separation chamber is equipped with an oil collection tank and an oil discharge valve; the oil collection tank is used to collect the floating oil on the water surface after oil-water separation; the oil discharge valve is used to control the opening and closing of the oil collection tank, and to control the floating oil to enter the oil collection tank and be discharged in the oil collection tank.

[0016] As a preferred embodiment of the biological oil-water separation device described in this application, the biological agent dosing system includes an automatic dosing pump connected to a microbial agent storage tank, used to add a microbial agent containing biological agents to the oil-water separation chamber; the biological agents include one or more of the genera *Pseudomonas*, *Bacillus*, and *Bacillus cyclophosphamide*.

[0017] The aeration system includes microporous aeration heads, an air vent pipe connected to the microporous aeration heads, and a blower connected to the air vent pipe. The blower starts intermittently, and its working period includes an aeration period and a settling period. During the aeration period, the blower delivers gas to the air vent pipe, and the gas reaches the microporous aeration heads through the air vent pipe and enters the wastewater at the microporous aeration heads to form bubbles. During the settling period, the blower stops running.

[0018] As a preferred embodiment of the biological oil-water separator described in this application, the control system includes a data processing module; the data processing module is used to continuously monitor the power of the blower in the aeration system, construct a power sequence of the blower in each aeration period, and calculate the aeration effectiveness index for each aeration period based on the power sequence.

[0019] The power sequence of any aeration period is a time series composed of the power of the blower at different times during the aeration period; the data processing module is preset with time anchor points, which are used to extract data from the power sequence and calculate the aeration effectiveness index; the time anchor points include a first time anchor point, a second time anchor point, and a third time anchor point.

[0020] As a preferred embodiment of the biological oil-water separator described in this application, the method by which the data processing module calculates the effective aeration index for any aeration period is as follows:

[0021] Extract the first observation sequence from the corresponding power sequence; the first observation sequence includes the blower's position during the aeration period. Power at any given moment; The preset first time anchor point;

[0022] Calculate the instantaneous rate of change of power at each moment in the first observation sequence and take the average value to obtain the start-up transient slope of the aeration period;

[0023] Extract the second observation sequence from the corresponding power sequence; the second observation sequence includes the blower's position during the aeration period. From the moment to the first Power at any given moment; As the preset second time anchor point, This is the preset third time anchor point;

[0024] Calculate the standard deviation of the power at each moment in the second observation sequence to obtain the steady-state fluctuation rate during the aeration period;

[0025] The transient slope and steady-state fluctuation rate at startup are normalized and then weighted and summed. The reciprocal of the weighted sum is taken to obtain the effective aeration index for the corresponding aeration period.

[0026] In a preferred embodiment of the bio-oil separator described in this application, the control system further includes a first control module; the first control module is used to control the operation of the blower; the first control module is configured with an aeration control strategy, specifically including:

[0027] If the effective aeration index continues to decrease for the most recent M consecutive aeration periods, the duty cycle of the aeration period in each aeration cycle will be adjusted from a preset first duty cycle to a preset second duty cycle; wherein, the first duty cycle is greater than the second duty cycle; M is a positive integer;

[0028] Any aeration cycle includes an aeration period and a resting period adjacent to the aeration period; the duty cycle of any aeration cycle is the ratio of the duration of the aeration period to the duration of the aeration cycle.

[0029] As a preferred embodiment of the bio-oil separation device described in this application, the control system further includes a second control module; the second control module is used to control the operation of the automatic dosing pump; the second control module is configured with a microbial dosing control strategy, specifically including:

[0030] If the effective aeration index for N consecutive aeration periods is lower than the preset effective aeration threshold, an oil removal status index is calculated based on the effective aeration index; N is a positive integer; the second control module is also configured with a first status threshold and a second status threshold; if the oil removal status index is greater than or equal to the first status threshold and less than the second status threshold, the automatic dosing pump is set to the repair dosing mode; if the oil removal status index is less than the first status threshold, the automatic dosing pump is set to the reconstruction dosing mode, and an aeration constraint command is sent to the first control module; the first control module responds to the aeration constraint command and sets the blower's operating mode to the aeration constraint mode.

[0031] As a preferred embodiment of the bio-oil separator described in this application, the step of setting the working mode of the automatic dosing pump to the repair dosing mode specifically includes: adjusting the dosage of the next addition of bacterial agent from the preset basic dosage to the repair dosage; wherein the repair dosage is greater than the basic dosage.

[0032] As a preferred embodiment of the bio-oil separation device described in this application, the step of setting the operating mode of the automatic dosing pump to the reconstruction dosing mode specifically includes:

[0033] The total dosage for future S doses of microbial agent will be adjusted from the base dosage to the reconstruction dosage of S times, and the total dosage will be allocated to the dosage for each of the future S doses of microbial agent; S is a positive integer; the reconstruction dosage is greater than the repair dosage.

[0034] As a preferred embodiment of the biological oil-water separator described in this application, the step of setting the working mode of the blower to an aeration constraint mode includes constraining at least one aeration parameter; the aeration parameter includes aeration energy, aeration duration, and cumulative aeration volume;

[0035] The aeration energy is the input energy of the blower per unit time during the aeration period; constraining the aeration energy specifically includes limiting the aeration energy to less than The basic aeration energy is times that of the standard aeration energy;

[0036] The aeration duration refers to the duration of any aeration period; the aeration duration is constrained, specifically by limiting the aeration duration to less than [a certain value]. Double the base aeration time;

[0037] The cumulative aeration volume is the total air volume delivered by the blower in any aeration cycle; the cumulative aeration volume is constrained, specifically by limiting the cumulative aeration volume to less than The base cumulative aeration volume is times that of the base volume.

[0038] Compared with the prior art, the beneficial effects achieved by this application are as follows:

[0039] By adding highly efficient compound microbial agents, organic matter such as animal and vegetable oils and food residues in the water are decomposed and eventually metabolized into harmless carbon dioxide and water, reducing the amount of solid waste and scum generated at the source and solving the problem of solid matter accumulation in traditional equipment.

[0040] During aeration, microbubbles combine with oil droplets and fine suspended matter, causing them to rise rapidly and enhancing oil-water separation. Aeration provides ample dissolved oxygen to the water, ensuring the activity of aerobic bacteria and maintaining their vigorous metabolic capacity, thus continuously and efficiently decomposing pollutants. Intermittent, timed aeration significantly reduces energy consumption compared to continuous aeration; the combined dynamic and static operation mode ensures separation efficiency while creating optimal conditions for biodegradation. Attached Figure Description

[0041] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. Wherein:

[0042] Figure 1 This is a structural schematic diagram of a bio-oil separator provided in this application;

[0043] Figure 2 A schematic diagram of the operating mode of the control system provided in this application.

[0044] Explanation of reference numerals in the attached diagram: 1. Box body; 2. Biological inoculation system; 3. Aeration system; 4. Primary separation chamber; 5. Oil-water separation chamber; 6. Clear water discharge chamber; 41. Inlet; 42. Filter screen; 51. Oil collection tank; 52. Oil discharge valve; 61. Outlet. Detailed Implementation

[0045] The technical solution of this application will be described in detail below with reference to the accompanying drawings and specific embodiments. It should be understood that the embodiments and specific features in the embodiments are detailed descriptions of the technical solution of this application, rather than limitations thereof. In the absence of conflict, the embodiments and technical features in the embodiments can be combined with each other.

[0046] This embodiment describes a biological oil separation device, referring to... Figure 1 The biological oil-water separator includes a housing 1, a biological inoculation system 2, and an aeration system 3; the housing 1 is equipped with a primary separation chamber 4, an oil-water separation chamber 5, and a clean water discharge chamber 6.

[0047] Primary separation chamber 4 is used for primary filtration of wastewater; oil-water separation chamber 5 is used for oil-water separation of wastewater to obtain clean water; clean water discharge chamber 6 is used for storage and discharge of clean water.

[0048] The clear water discharge chamber 6 is equipped with a water outlet 61 for discharging the clear water obtained after oil-water separation.

[0049] The primary separation chamber 4 is equipped with an inlet 41 and a filter screen 42; the inlet 41 is used to introduce sewage into the primary separation chamber 4; the filter screen 42 is used to filter solid particles in the sewage; optionally, the filter screen 42 is a basket-type grid structure, which is easy to replace and clean.

[0050] The oil-water separation chamber 5 is equipped with an oil collection tank 51 and an oil discharge valve 52. The oil collection tank 51 is used to collect the floating oil on the water surface after oil-water separation. The oil discharge valve 52 is used to control the opening and closing of the oil collection tank 51, controlling the floating oil to enter the oil collection tank 51 and be discharged from it. In this embodiment, the oil collection tank 51 is located at the top, which facilitates the collection of some residual floating oil, biological bacteria, and other undecomposed impurities in the sewage on the water surface, ensuring that the clean water discharged into the clean water discharge chamber 6 meets the discharge standards.

[0051] The biological bacteria dosing system 2 is used to add biological bacteria into the oil-water separation chamber 5; the aeration system 3 aerates at regular intervals to generate bubbles, which adhere to the oil in the wastewater, causing the oil to float to the water surface and be degraded by the biological bacteria.

[0052] The biological agent dosing system 2 includes an automatic dosing pump connected to the agent storage tank, used to add an agent containing biological agents to the oil-water separation chamber 5; the biological agents include one or more of the genera *Pseudomonas*, *Bacillus*, and *Bacillus cyclophosphamide*.

[0053] Optionally, the biological inoculation system 2 also includes a biological packing frame disposed within the oil-water separation chamber 5. The biological packing is a porous suspended packing or a fixed packing, providing a carrier for the attachment and growth of biological bacteria. The bacterial agent includes a complex of microorganisms capable of efficiently decomposing oils and other organic matter, such as strains that feed on oils, fatty acids, starches, and proteins, to decompose oils and other major organic pollutants in wastewater.

[0054] The aeration system 3 includes a microporous aeration head, an air vent connected to the microporous aeration head, and a blower connected to the air vent. The blower starts intermittently, and its working period includes an aeration period and a settling period. During the aeration period, the blower delivers gas to the air vent, and the gas passes through the air vent to reach the microporous aeration head, where it enters the wastewater to form bubbles. During the settling period, the blower stops running.

[0055] During the settling period, bubble generation is stopped, ensuring that the wastewater in the oil-water separation chamber 5 has sufficient settling time, allowing the floating oil to settle stably on the water surface for easy collection, and providing a relatively stable environment for the microorganisms to efficiently degrade oils and other organic matter.

[0056] In this embodiment, the microporous aeration head is located at the bottom of the oil-water separation chamber 5, which facilitates the generation of bubbles to fully carry the oil and other major organic matter and suspended solids in the sewage to the water surface to react with the biological bacteria, thus ensuring the effectiveness of oil-water separation.

[0057] In this embodiment, the oil-water separation chamber 5 is connected to the primary separation chamber 4 and the clear water discharge chamber 6, respectively. During sewage treatment, the sewage first enters the oil-water separation chamber 5 through the inlet 41, and after being filtered by the filter screen 42 to remove solid particles, it enters the oil-water separation chamber 5. In the oil-water separation chamber 5, the sewage achieves oil-water separation under the action of the biological bacteria dosing system 2 and the aeration system 3. The residual floating oil is collected in the oil collection tank 51 through the oil discharge valve 52 and is finally discharged in the oil collection tank 51. The clear water obtained after oil-water separation enters the clear water discharge chamber 6 for temporary storage and is finally discharged through the outlet 61.

[0058] The biological oil separator also includes a control system; the control system is used to calculate the aeration effectiveness index and control the start-up and shutdown of the aeration system 3 and the aeration energy based on the aeration effectiveness index; the control system also controls the dosage and frequency of the biological bacteria feeding system 2 based on the aeration effectiveness index.

[0059] Reference Figure 2 The control system includes a data processing module, a first control module, and a second control module;

[0060] The data processing module is used to continuously monitor the power of the blower in the aeration system 3, construct the power sequence of the blower in each aeration period, and calculate the aeration effectiveness index for each aeration period based on the power sequence.

[0061] The power sequence of any aeration period is a time sequence composed of the power of the blower at different times during the aeration period; the data processing module is preset with time anchor points, which are used to extract data from the power sequence and calculate the aeration effectiveness index; the time anchor points include a first time anchor point, a second time anchor point, and a third time anchor point;

[0062] The data processing module calculates the effective aeration index for any aeration period as follows:

[0063] Extract the first observation sequence from the corresponding power sequence; the first observation sequence includes the blower's position during the aeration period. Power at any given moment; The preset first time anchor point;

[0064] Calculate the instantaneous rate of change of power at each moment in the first observation sequence and take the average value to obtain the start-up transient slope of the aeration period;

[0065] The instantaneous rate of change of power at any given moment is the slope of the power curve at that moment. The transient slope at startup is used to characterize the smoothness of the air path establishment process and the characteristics of resistance changes in the aeration system 3 during the startup phase. Its change reflects the ease with which the gas overcomes the pipeline resistance. If the power changes rapidly in a short period of time during the startup phase, it indicates that the air path resistance is large or unstable, and the newly added aeration is mainly used to overcome the resistance rather than to form effective bubbles.

[0066] Extract the second observation sequence from the corresponding power sequence; the second observation sequence includes the blower's position during the aeration period. From the moment to the first Power at any given moment; As the preset second time anchor point, This is the preset third time anchor point;

[0067] Calculate the standard deviation of the power at each moment in the second observation sequence to obtain the steady-state fluctuation rate during the aeration period;

[0068] In this embodiment, the steady-state fluctuation rate is used to characterize the continuity and uniformity of bubble release after the aeration system 3 enters steady-state operation. Its fluctuation degree reflects the existence of air path disturbances and local instability. If the power fluctuates frequently, the bubble release will be uneven, there will be disturbances or local instability in the air path, and the newly added aeration energy will be converted into more disturbances than effective bubbles.

[0069] The instantaneous slope and steady-state volatility are normalized and then weighted and summed. The reciprocal of the weighted sum is taken to obtain the effective aeration index for the corresponding aeration period. Those skilled in the art can set specific values ​​for the first time anchor point, the second time anchor point, the third time anchor point, and the weighting coefficients of the instantaneous slope and steady-state volatility based on actual needs.

[0070] Traditional aeration systems often employ fixed-duration aeration and settling cycles. However, if aeration heads become clogged, foam accumulates, or oil adheres, the number and size distribution of bubbles become unstable, making timely detection and intervention impossible. This application constructs an aeration effectiveness index by using the blower's power as a system characteristic. This index is then used to determine whether to continue aeration, initiate settling, and trigger adjustments for biological bacteria dosage, thereby improving oil-water separation efficiency.

[0071] The first control module is used to control the operation of the blower; the first control module is configured with an aeration control strategy, specifically including:

[0072] If the effective aeration index continues to decrease for the most recent M consecutive aeration periods, the duty cycle of the aeration period in each aeration cycle will be adjusted from a preset first duty cycle to a preset second duty cycle; wherein, the first duty cycle is greater than the second duty cycle; M is a positive integer;

[0073] Any aeration cycle includes an aeration period and a resting period adjacent to the aeration period; the duty cycle of any aeration cycle is the ratio of the duration of the aeration period to the duration of the aeration cycle.

[0074] Those skilled in the art can set the specific values ​​of M and the first and second duty cycles based on actual needs. When the aeration effectiveness index continues to decrease, it indicates that the effective bubble generation and stable release effect brought about by the unit aeration energy continues to weaken, that is, the marginal benefit of aeration is lower than expected. Under this state, continuing to maintain a high aeration power will no longer bring about effective oil-water separation or oil degradation effect, but will instead increase disturbance and energy consumption.

[0075] The second control module is used to control the operation of the automatic dosing pump; the second control module is configured with a bacterial dosing control strategy, specifically including:

[0076] If the effective aeration index for N consecutive aeration periods is lower than the preset effective aeration threshold, an oil removal status index is calculated based on the effective aeration index; N is a positive integer; the second control module is also configured with a first status threshold and a second status threshold; if the oil removal status index is greater than or equal to the first status threshold and less than the second status threshold, the automatic dosing pump is set to the repair dosing mode; if the oil removal status index is less than the first status threshold, the automatic dosing pump is set to the reconstruction dosing mode, and an aeration constraint command is sent to the first control module; the first control module responds to the aeration constraint command and sets the blower's operating mode to the aeration constraint mode.

[0077] Those skilled in the art can set specific values ​​for N, the effective aeration threshold, the first state threshold, and the second state threshold based on actual needs.

[0078] Optionally, the formula for the second control module to calculate the oil removal status index is as follows:

[0079] ;

[0080] Wherein, B represents the oil removal status index; The reference values ​​for the oil removal status index are represented by α, which is an adjustment coefficient and is set by those skilled in the art based on actual needs; E represents the average of the aeration effectiveness index for the most recent N consecutive aeration periods. This represents the effective aeration threshold. According to the formula above, the greater the difference between the effective aeration index and the effective aeration threshold, the lower the oil removal status index.

[0081] When the effective aeration index remains below the preset effective aeration threshold, bubble formation is insufficient or unstable, and the effective contact conditions between the microorganisms and oils and suspended organic matter deteriorate; their actual efficiency in the oil removal and degradation process decreases. If the oil removal status index is greater than or equal to the first status threshold and less than the second status threshold, the effective aeration index is below the ideal range but has not yet severely failed; bubbles can still be formed, but the efficiency is low or the stability is insufficient. In this case, a repair addition is used to compensate for the decrease in oil removal efficiency caused by the decrease in bubble formation efficiency by increasing the number or metabolic density of microorganisms that can participate in the reaction per unit volume, thus maintaining the effective participation of microorganisms in the oil removal process. If the oil removal status index is less than the first status threshold, the effective aeration index remains in the low range for a long time, the bubble formation efficiency is significantly insufficient or highly unstable; there is a risk of systemic failure in the role of microorganisms in the oil removal process, that is, under the current aeration conditions, the original synergistic mechanism between microorganisms and bubbles is difficult to form an effective oil removal pathway. At this point, a reconstruction dosing method is adopted to re-establish a biological participation mechanism adapted to the current aeration conditions; through a higher cumulative dosing amount, a new biological bacteria action basis is formed in the oil-water separation chamber 5, creating conditions for the subsequent restoration of the oil removal path under low disturbance conditions.

[0082] Setting the automatic dosing pump to the repair dosing mode specifically includes: adjusting the dosage of the next bacterial agent addition from the preset basic dosage to the repair dosage; wherein the repair dosage is greater than the basic dosage.

[0083] In existing bio-oil separators, compound microbial agents are typically added periodically at fixed frequencies and dosages to maintain treatment capacity. Regular, quantitative addition cannot measure whether the microbial community has been effectively established or whether it has been destroyed by air bubbles, thus failing to achieve on-demand addition. Those skilled in the art can set a base dosage and a remediation dosage based on actual needs; for example, the remediation dosage can be set to 1.5-2 times the base dosage. By increasing the dosage by a limited margin, the reduction in biodegradation capacity caused by decreased aeration effectiveness can be compensated.

[0084] Setting the automatic dosing pump to the reconstruction dosing mode specifically includes:

[0085] The total dosage for future S doses of microbial agent will be adjusted from the base dosage to the reconstruction dosage of S times, and the total dosage will be allocated to the dosage for each of the future S doses of microbial agent; S is a positive integer; the reconstruction dosage is greater than the repair dosage.

[0086] Optionally, the total amount of feed can be allocated to the next S feeds in a progressively decreasing manner, with each feed being no less than the base amount, in order to achieve the gradual reconstruction of the microbial community.

[0087] Setting the blower's operating mode to an aeration constraint mode includes constraining at least one aeration parameter; the aeration parameter includes aeration energy, aeration duration, and cumulative aeration volume.

[0088] The aeration energy is the input energy of the blower per unit time during the aeration period; constraining the aeration energy specifically includes limiting the aeration energy to less than The basic aeration energy is times that of the standard aeration energy;

[0089] The aeration duration refers to the duration of any aeration period; the aeration duration is constrained, specifically by limiting the aeration duration to less than [a certain value]. Double the base aeration time;

[0090] The cumulative aeration volume is the total air volume delivered by the blower in any aeration cycle; the cumulative aeration volume is constrained, specifically by limiting the cumulative aeration volume to less than The base cumulative aeration volume is times that of the base volume.

[0091] , , All values ​​are greater than 0 and less than 1; those skilled in the art can set the values ​​based on actual needs. , , The specific values ​​for basic aeration energy, basic aeration duration, and basic cumulative aeration volume are specified. The first control module can constrain aeration parameters by reducing the output power of the blower and the duty cycle of the aeration period.

[0092] By constraining at least one of the aeration energy, aeration duration, and cumulative aeration volume, the aeration process is switched from an enhanced mass transfer state to a low-disturbance maintenance state, providing a stable environment for microbial community reconstruction and reducing the disturbance of aeration to the microbial community reconstruction process.

[0093] Those skilled in the art will understand that embodiments of this application can be provided as methods, systems, or computer program products. Therefore, this application can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, this application can take the form of a computer program product implemented on one or more computer-usable storage media containing computer-usable program code, including but not limited to disk storage, CD-ROM, optical storage, etc.

[0094] The embodiments of this application have been described above with reference to the accompanying drawings. However, this application is not limited to the specific embodiments described above. The specific embodiments described above are merely illustrative and not restrictive. Those skilled in the art can make many other forms under the guidance of this application without departing from the spirit and scope of protection of this application, and these forms are all within the protection scope of this application.

Claims

1. A biological oil-water separator, characterized in that: It includes a housing (1), a biological inoculation system (2), and an aeration system (3); the housing (1) is equipped with a primary separation chamber (4), an oil-water separation chamber (5), and a clean water discharge chamber (6); The primary separation chamber (4) is used for primary filtration of sewage; the oil-water separation chamber (5) is used for oil-water separation of sewage to obtain clean water; the clean water discharge chamber (6) is used for storage and discharge of clean water. The biological bacteria dosing system (2) is used to add biological bacteria to the oil-water separation chamber (5); the aeration system (3) generates bubbles by aeration at regular intervals. The bubbles adhere to the oil in the sewage, causing the oil to float to the water surface and be degraded by the biological bacteria. The biological oil separator also includes a control system; the control system is used to calculate the aeration effectiveness index and control the start-up and shutdown of the aeration system (3) and the aeration energy based on the aeration effectiveness index; the control system also controls the dosage and frequency of the biological bacteria feeding system (2) based on the aeration effectiveness index. The control system includes a data processing module; the data processing module is used to continuously monitor the power of the blower in the aeration system (3), construct the power sequence of the blower in each aeration period, and calculate the aeration effective index of each aeration period based on the power sequence. The power sequence of any aeration period is a time sequence composed of the power of the blower at different times during the aeration period; the data processing module is preset with time anchor points, which are used to extract data from the power sequence and calculate the aeration effectiveness index; the time anchor points include a first time anchor point, a second time anchor point, and a third time anchor point; The data processing module calculates the effective aeration index for any aeration period as follows: Extract the first observation sequence from the corresponding power sequence; the first observation sequence includes the blower's position during the aeration period. Power at any given moment; The preset first time anchor point; Calculate the instantaneous rate of change of power at each moment in the first observation sequence and take the average value to obtain the start-up transient slope of the aeration period; Extract the second observation sequence from the corresponding power sequence; the second observation sequence includes the blower's position during the aeration period. From the moment to the first Power at any given moment; As the preset second time anchor point, This is the preset third time anchor point; Calculate the standard deviation of the power at each moment in the second observation sequence to obtain the steady-state fluctuation rate during the aeration period; The transient slope and steady-state fluctuation rate at startup are normalized and then weighted and summed. The reciprocal of the weighted sum is taken to obtain the effective aeration index for the corresponding aeration period.

2. The biological oil-water separator as described in claim 1, characterized in that: The clear water discharge chamber (6) is equipped with a water outlet (61) for discharging the clear water obtained after oil-water separation; The primary separation chamber (4) is equipped with an inlet (41) and a filter screen (42); the inlet (41) is used to introduce sewage into the primary separation chamber (4); the filter screen (42) is used to filter solid particles in the sewage; The oil-water separation chamber (5) is equipped with an oil collection tank (51) and an oil discharge valve (52); the oil collection tank (51) is used to collect the floating oil on the water surface after oil-water separation; the oil discharge valve (52) is used to control the opening and closing of the oil collection tank (51), control the floating oil to enter the oil collection tank (51) and be discharged in the oil collection tank (51).

3. The biological oil-water separator as described in claim 2, characterized in that: The biological agent dosing system (2) includes an automatic dosing pump connected to the agent storage tank for adding an agent containing biological agents to the oil-water separation chamber (5); the biological agents include one or more of the genera Pseudomonas, Bacillus, and Cyclocarya. The aeration system (3) includes a microporous aeration head, an air pipe connected to the microporous aeration head, and a blower connected to the air pipe; the blower is started intermittently, and the working period includes an aeration period and a resting period; during the aeration period, the blower delivers gas to the air pipe, the gas passes through the air pipe to reach the microporous aeration head, and enters the sewage at the microporous aeration head to form bubbles; During the resting period, the blower stops running.

4. The biological oil-water separator as described in claim 3, characterized in that: The control system further includes a first control module; the first control module is used to control the operation of the blower; the first control module is configured with an aeration control strategy, specifically including: If the effective aeration index continues to decrease for the most recent M consecutive aeration periods, the duty cycle of the aeration period in each aeration cycle will be adjusted from a preset first duty cycle to a preset second duty cycle; wherein, the first duty cycle is greater than the second duty cycle; M is a positive integer; Any aeration cycle includes an aeration period and a resting period adjacent to the aeration period; the duty cycle of any aeration cycle is the ratio of the duration of the aeration period to the duration of the aeration cycle.

5. A biological oil-water separator as described in claim 4, characterized in that: The control system further includes a second control module; the second control module is used to control the operation of the automatic dosing pump; the second control module is configured with a bacterial dosing control strategy, specifically including: If the effective aeration index is lower than the preset effective aeration threshold for N consecutive aeration periods, then the oil removal status index is calculated based on the effective aeration index, as shown in the following formula: ； Wherein, B represents the oil removal status index; The reference value for the oil removal status index is represented by α, which is the adjustment coefficient; E represents the average value of the effective aeration index for the most recent N consecutive aeration periods. Indicates the effective aeration threshold; N is a positive integer; The second control module is also configured with a first state threshold and a second state threshold; if the oil removal state index is greater than or equal to the first state threshold and less than the second state threshold, the working mode of the automatic dosing pump is set to the repair dosing mode; if the oil removal state index is less than the first state threshold, the working mode of the automatic dosing pump is set to the reconstruction dosing mode, and an aeration constraint command is sent to the first control module; the first control module responds to the aeration constraint command and sets the working mode of the blower to the aeration constraint mode.

6. A biological oil-water separator as described in claim 5, characterized in that: Setting the automatic dosing pump to the repair dosing mode specifically includes: adjusting the dosage of the next bacterial agent addition from the preset basic dosage to the repair dosage; wherein the repair dosage is greater than the basic dosage.

7. A biological oil-water separator as described in claim 6, characterized in that: Setting the automatic dosing pump to the reconstruction dosing mode specifically includes: The total dosage for future S doses of microbial agent will be adjusted from the base dosage to the reconstruction dosage of S times, and the total dosage will be allocated to the dosage for each of the future S doses of microbial agent; S is a positive integer; the reconstruction dosage is greater than the repair dosage.

8. A biological oil-water separator as described in claim 7, characterized in that: Setting the blower's operating mode to an aeration constraint mode includes constraining at least one aeration parameter; the aeration parameter includes aeration energy, aeration duration, and cumulative aeration volume. The aeration energy is the energy input to the blower per unit time during the aeration period; Constraining aeration energy specifically includes limiting the aeration energy to less than [amount missing]. The basic aeration energy is times that of the standard aeration energy; The aeration duration refers to the duration of any aeration period; the aeration duration is constrained, specifically by limiting the aeration duration to less than [a certain value]. Double the base aeration time; The cumulative aeration volume is the total air volume delivered by the blower in any aeration cycle; the cumulative aeration volume is constrained, specifically by limiting the cumulative aeration volume to less than The base cumulative aeration volume is times that of the base volume.

Images