Petrochemical sewage treatment method and system

Abstract

The invention relates to a petrochemical engineering sewage treatment method and system which are applied to a sewage treatment system to be transformed. Comprising an exclusive strain in-situ production device for putting exclusive strains into the sewage treatment system to be transformed and a compact sludge separation device for screening sludge in the sewage treatment system to be transformed. Through the exclusive strain in-situ production device, exclusive strains are accurately put according to the type and concentration of pollutants in sewage, and the degradation efficiency of complex pollutants is remarkably improved. The targeted treatment mode can effectively solve the limitation of a traditional activated sludge method in treatment of petrochemical wastewater, and the treatment efficiency and stability are improved. The compact sludge separation device can effectively separate light and heavy sludge, maintain reasonable composition and activity of the sludge, avoid influence of sludge property change on a biochemical system, and ensure stable operation of a sewage treatment system.

Description

Technical Field

[0001] The present invention relates to the technical field of sewage treatment, and in particular to a method and system for treating petrochemical sewage. Background Art

[0002] With the rapid development of the petrochemical industry, the large amount of wastewater generated in its production process has become a severe environmental challenge. Petrochemical wastewater has a complex composition and contains a variety of organic compounds (such as hydrocarbons, phenols, aromatic hydrocarbons), heavy metal ions, and some difficult-to-degrade substances. These pollutants not only cause serious harm to the environment, but also pose a threat to human health. Traditional sewage treatment methods, especially ordinary activated sludge methods, lack specificity of bacterial strains, and have problems such as low treatment efficiency and weak impact resistance when treating petrochemical sewage. In addition, when the activated sludge is impacted by incoming water, the microbial community structure and sludge properties will change, which will seriously affect the treatment capacity of the biochemical system and lead to deterioration of effluent water quality.

[0003] Although technicians in this field have been working hard to improve sewage treatment technology, existing improvement methods often require overall transformation of the original sewage treatment system. This overall transformation is not only costly, but also has a long construction period and has a great impact on the normal operation of existing sewage treatment facilities. For example, the additional investment for some sewage treatment plants to upgrade from Class B standards to Class A standards is equal to 50%-70% of the original investment cost of the treatment plant, and the direct operating cost may increase by 30%. If the financial cost of the investment is added, the operating cost is estimated to increase by 40%-50%. In addition, the overall transformation process may also face technical compatibility issues, such as data islands, incompatible equipment interfaces, etc., which further increase the difficulty and cost of the transformation.

[0004] In recent years, although sewage treatment technology has made certain progress, there are still many limitations. For example, although some new technologies can improve treatment efficiency, they are costly and difficult to apply on a large scale. In addition, sludge treatment is also an important issue. Traditional sludge treatment methods are often inefficient and cannot effectively separate light and heavy sludge, resulting in changes in sludge properties and affecting the stable operation of the entire sewage treatment system. Therefore, there is an urgent need for an innovative sewage treatment technology that can improve the treatment capacity of the biochemical system without overall transformation, and achieve deep treatment of petrochemical wastewater and meet discharge or reuse standards. Summary of the invention

[0005] 1. Technical issues to be resolved

[0006] The technical problem to be solved by the present invention is to reduce the modification cost of the original sewage treatment system and to provide a petrochemical sewage treatment method and system.

[0007] (II) Technical solution

[0008] In order to solve the above problems, the present invention provides a petrochemical wastewater treatment method in the first aspect, which is applied to a wastewater treatment system to be transformed; the biochemical pool of the wastewater treatment system to be transformed includes an anaerobic zone and an aerobic zone; the anaerobic zone is used to place Denitrifying Bacillus, Steinerella, and Phylobacterium fluorescens; the aerobic zone is used to place Nitrosomonas and Nitrosomonas;

[0009] Methods include:

[0010] The water monitoring probe of the first control and monitoring unit monitors the pollutant index of the sewage in the biochemical pool;

[0011] When the pollutant index exceeds the preset threshold, the first control monitoring unit records the excess magnitude and the first excess time;

[0012] If the pollutant index continues to exceed the preset threshold, a secondary warning will be issued according to the preset rules;

[0013] The bacterial fermentation unit expands the culture of exclusive bacterial strains according to pollutant indicators and puts them into the biochemical pool.

[0014] The cultivation process is based on the dynamic model of bacterial culture:

[0015]

[0016] Among them, μ max is the maximum specific growth rate, in h -1 ; S is the pollutant concentration of the sewage in the biochemical pool, in mg / L; K s is the pollutant saturation constant of the sewage in the biochemical pool, in mg / L, indicating the pollutant concentration of the sewage in the biochemical pool when the bacterial growth rate reaches half of the maximum value;

[0017] The temperature regulation process is based on the temperature regulation model:

[0018]

[0019] Among them, T new is the adjusted culture temperature, in °C; T base is the reference temperature, unit is °C; Δμ is the change in specific growth rate, unit is h -1 ; ΔT is the effect coefficient of temperature change on growth rate, unit: h -1 / ℃;μ target is the target specific growth rate, in h -1 ;μ current is the current specific growth rate in h -1 ;

[0020] The amount of strains released is based on the release model:

[0021]

[0022] Among them, Q is the amount of bacteria added, unit is g; V is the volume of the biochemical pool, unit is m 3 ; C pollutant is the pollutant concentration of the sewage in the biochemical pool, in mg / L; K eff is the removal efficiency of the strain on pollutants, in mg / mg; Y is the growth rate of the strain, in g / g; μ current is the current specific growth rate, in h -1 .

[0023] Among them, it also includes:

[0024] The sludge monitoring probe of the second control and monitoring unit monitors the sludge index in the biochemical pool;

[0025] When the sludge index exceeds the set threshold, the inlet of the sludge cyclone unit receives the sludge in the sludge return pipeline connection, and the sludge cyclone unit separates the light and heavy sludge;

[0026] The heavy sludge flows back to the front end of the biochemical pool through the bottom flow outlet of the sludge cyclone unit;

[0027] The light sludge is discharged into the residual sludge pipeline through the overflow port of the sludge cyclone unit.

[0028] This also includes water quality fluctuation analysis:

[0029] The water monitoring probe of the first control and monitoring unit monitors the pollutant index of the sewage in the biochemical pool at a set time interval;

[0030] Obtain the changes in pollutant indicators at adjacent moments, and record the change trends and change times;

[0031] According to the change situation and change time, obtain the number of change moments and the duration of each change;

[0032] Screening of major pollutant indicators that have changed;

[0033] According to the number of change moments and the duration of each change, determine whether the water quality fluctuation meets the requirements;

[0034] If it does not meet the requirements, the bacterial strain fermentation unit will expand the culture of the exclusive bacterial strain based on the main pollutant indicators that have changed.

[0035] This also includes sludge fluctuation analysis:

[0036] The sludge monitoring probe of the second control and monitoring unit monitors the sludge index in the biochemical pool at a set time interval;

[0037] Record the time and range of changes in sludge indicators;

[0038] Obtain sludge indicators whose fluctuations exceed the set threshold;

[0039] According to the preset sludge stability requirements, determine whether the sludge fluctuation meets the requirements;

[0040] If not, the operating parameters of the sludge cyclone unit are adjusted according to the variation range.

[0041] In the second aspect, the present invention provides a petrochemical wastewater treatment system, which is applied to a wastewater treatment system to be modified; the biochemical pool of the wastewater treatment system to be modified includes an anaerobic zone and an aerobic zone; the anaerobic zone is used to place Denitrifying Bacillus, Steinerella, and Phyllobacterium fluorescens; the aerobic zone is used to place Nitrosomonas and Nitrosomonas;

[0042] The system comprises an exclusive bacterial strain in-situ production device for introducing the exclusive bacterial strain into the sewage treatment system to be transformed and a dense sludge separation device for screening the sludge in the sewage treatment system to be transformed.

[0043] Furthermore, the dedicated strain in-situ production device comprises: a strain fermentation unit and a first control and monitoring unit;

[0044] The strain introduction ports of the strain fermentation unit are respectively placed in the anaerobic zone and the aerobic zone of the biochemical pool;

[0045] The water monitoring probe of the first control and monitoring unit is placed in the water of the biochemical pool.

[0046] Further, the dense sludge separation device comprises: a sludge cyclone unit and a second control and monitoring unit;

[0047] The inlet of the sludge cyclone unit is connected to the sludge return pipeline, the underflow port of the sludge cyclone unit is connected to the front end of the biochemical pool, and the overflow port of the sludge cyclone unit is connected to the residual sludge pipeline;

[0048] The sludge monitoring probe of the second control and monitoring unit is placed in the sludge of the biochemical pool.

[0049] (III) Beneficial effects

[0050] The above technical solution of the present invention has the following advantages:

[0051] Strong targeting: Through the dedicated strain in-situ production device, the dedicated strain is accurately placed according to the type and concentration of pollutants in the sewage, which significantly improves the degradation efficiency of complex pollutants. This targeted treatment method can effectively solve the limitations of the traditional activated sludge method in treating petrochemical wastewater and improve treatment efficiency and stability.

[0052] High system stability: The dense sludge separation device can effectively separate light and heavy sludge, maintain the reasonable composition and activity of the sludge, avoid the impact of changes in sludge properties on the biochemical system, and ensure the stable operation of the sewage treatment system. This separation technology can significantly improve the efficiency of sludge treatment and reduce the burden of subsequent treatment.

[0053] Water quality fluctuation control: Through water quality fluctuation analysis and sludge fluctuation analysis, the key indicators of sewage and sludge are monitored in real time, and the treatment parameters are adjusted dynamically to ensure that the effluent quality is stable and up to standard. This real-time monitoring and dynamic adjustment mechanism can effectively deal with water quality fluctuations and high-concentration pollutants, and improve the adaptability and stability of the system.

[0054] High efficiency and low consumption: Combining the precise placement of exclusive bacteria and the optimized separation of sludge, the use of chemicals is reduced, the treatment cost is reduced, and the sewage treatment efficiency is improved. This high efficiency and low consumption treatment method can not only reduce operating costs, but also improve treatment effects, with significant economic and environmental benefits.

[0055] Strong adaptability: The device and method are suitable for a variety of complex sewage treatment scenarios, especially the deep treatment of petrochemical sewage, and can effectively deal with water quality fluctuations and high-concentration pollutants. This highly adaptable treatment technology can meet different sewage treatment needs and has broad application prospects. BRIEF DESCRIPTION OF THE DRAWINGS

[0056] The drawings of the present invention are provided for illustrative purposes only, and the proportions and quantities of the components in the drawings may not necessarily be consistent with the actual products.

[0057] Figure 1 is a schematic diagram of a processing system in an embodiment of the present invention;

[0058] Figure 2 It is a flow chart of the processing method in an embodiment of the present invention. DETAILED DESCRIPTION

[0059] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0060] See also Figure 1As shown, a petrochemical wastewater treatment system provided by an embodiment of the present invention is applied to a wastewater treatment system to be transformed, and the original wastewater treatment system can be retained and the treatment system can be directly installed at the wastewater biochemical system treatment site. Figure 1 The sewage treatment system to be transformed, that is, the original sewage treatment system, is the pretreatment unit 1, the biochemical pool 2 and the sedimentation pool 3 in the figure. The biochemical pool of the sewage treatment system to be transformed includes an anaerobic zone and an aerobic zone; the anaerobic zone is used to place Denitrifying Bacillus, Steinerella, and Phylobacterium fluorescens; the aerobic zone is used to place Nitrosomonas and Nitrosomonas;

[0061] The petrochemical wastewater treatment system includes an exclusive strain in-situ production device 4 for introducing exclusive strains into the wastewater treatment system to be transformed and a dense sludge separation device 5 for screening sludge in the wastewater treatment system to be transformed. Specifically:

[0062] The exclusive strain in-situ production device 4 includes: a strain fermentation unit and a first control and monitoring unit; the strain fermentation unit places the strain delivery port in the anaerobic zone and the aerobic zone of the biochemical pool respectively through a pipeline; the water body monitoring probe of the first control and monitoring unit is placed in the water body of the biochemical pool so as to be able to obtain various pollutant indicators in the sewage in real time.

[0063] The dense sludge separation device 5 includes: a sludge cyclone unit and a second control and monitoring unit; the inlet of the sludge cyclone unit is connected to the sludge return pipeline, the underflow port of the sludge cyclone unit is connected to the front end of the biochemical pool, and the overflow port of the sludge cyclone unit is connected to the residual sludge pipeline; the sludge monitoring probe of the second control and monitoring unit is placed in the sludge in the biochemical pool to monitor the sludge indicators in the biochemical pool.

[0064] In order to cooperate with the petrochemical wastewater treatment system, the present application also discloses a petrochemical wastewater treatment method, such as Figure 2 As shown, including:

[0065] It is applied to the sewage treatment system to be transformed; the biochemical pool of the sewage treatment system to be transformed includes an anaerobic zone and an aerobic zone; the anaerobic zone is used for placing Denitrifying Bacillus, Steinernea, and Aerobacterium fluorescens; the aerobic zone is used for placing Nitrosomonas and Nitrosomonas.

[0066] The water monitoring probe of the first control and monitoring unit monitors the pollutant indicators of the sewage in the biochemical pool; preferably, the pollutant indicators include COD, ammonia nitrogen and total phosphorus, but are not limited to the above pollutant indicators.

[0067] When the pollutant index exceeds the preset threshold, the first control monitoring unit records the excess magnitude and the first excess time;

[0068] If the pollutant index continues to exceed the preset threshold, a secondary warning will be issued according to the preset rules;

[0069] The bacterial fermentation unit expands the culture of exclusive bacterial strains according to pollutant indicators and puts them into the biochemical pool.

[0070] The cultivation process is based on the dynamic model of bacterial culture:

[0071]

[0072] Among them, μ max is the maximum specific growth rate, in h -1 ; S is the pollutant concentration of the sewage in the biochemical pool, in mg / L; K s is the pollutant saturation constant of the sewage in the biochemical pool, in mg / L, indicating the pollutant concentration of the sewage in the biochemical pool when the bacterial growth rate reaches half of the maximum value;

[0073] The temperature regulation process is based on the temperature regulation model:

[0074]

[0075] Among them, T new is the adjusted culture temperature, in °C; T base is the reference temperature, unit is °C; Δμ is the change in specific growth rate, unit is h -1 ; ΔT is the effect coefficient of temperature change on growth rate, unit: h -1 / ℃;μ target is the target specific growth rate, in h -1 ;μ current is the current specific growth rate in h -1 ;

[0076] The amount of strains released is based on the release model:

[0077]

[0078] Among them, Q is the amount of bacteria added, unit is g; V is the volume of the biochemical pool, unit is m 3 ; C pollutant is the pollutant concentration of the sewage in the biochemical pool, in mg / L; K eff is the removal efficiency of the strain on pollutants, in mg / mg; Y is the growth rate of the strain, in g / g; μ current is the current specific growth rate, in h -1 .

[0079] Specifically: the water body monitoring probe of the first control and monitoring unit monitors the pollutant index of the sewage in the biochemical pool at a set time interval; wherein different time intervals can be set for different types of pollutant indexes.

[0080] When the monitoring data of a certain pollutant index exceeds the preset range, the first control monitoring unit immediately starts the early warning analysis mechanism: when the pollutant index exceeds the preset threshold, the first control monitoring unit records the excess range and the first time of excess;

[0081] Continuous monitoring, if the pollutant index continues to exceed the preset threshold, a secondary warning will be issued according to the preset rules.

[0082] For example: Assuming that the preset range of COD is 50–150 mg / L, if the COD value is 180 mg / L at a certain moment, exceeding the upper limit, the first control monitoring unit first records the magnitude of the excess range (here 180-150=0 mg / L) and the time of the first excess. Over time, if the COD value continues to exceed the preset threshold of 150 mg / L in the next 120 minutes, the first control monitoring unit will issue a secondary warning according to the pre-set rules: if the magnitude of the excess range exceeds 20 mg / L and the duration exceeds 240 minutes.

[0083] Once the secondary warning conditions are met, the first control monitoring unit quickly sends a start signal to the exclusive strain fermentation unit. After receiving the signal, the strain fermentation unit starts the expansion culture process according to the preset fermentation process parameters.

[0084] Exemplary: According to the current pollutant indicators in the sewage, select a suitable bacterial culture medium formula. If the COD exceeds the standard seriously, a culture medium rich in specific carbon source degradation bacteria can be selected. Then, adjust the temperature, pH value, dissolved oxygen and other environmental parameters in the fermentation tank to a range suitable for the growth and reproduction of bacteria: such as temperature control at 30-35°C, pH value adjusted between 6.5-7.5, and dissolved oxygen maintained at 2-4mg / L. Next, the preserved bacteria are inoculated into the fermentation tank. During the fermentation process, the stirring device is used to ensure that the bacteria and the culture medium are fully mixed to promote the growth and reproduction of the bacteria. After a certain period of cultivation (such as 8-12 hours), the fermented exclusive bacteria are transported to the anaerobic zone and aerobic zone of the biochemical pool through the connecting pipe, and added according to a certain dosage ratio to enhance the biochemical pool's ability to degrade pollutants in sewage.

[0085] The sludge monitoring probe of the second control and monitoring unit monitors the sludge index in the biochemical pool; the sludge index can be selected as sludge concentration, but is not limited to sludge concentration, and those skilled in the art can also make a selection according to actual conditions.

[0086] When the sludge index exceeds the set threshold, the inlet of the sludge cyclone unit receives the sludge in the sludge return pipeline connection, and the sludge cyclone unit separates the light and heavy sludge;

[0087] The heavy sludge flows back to the front end of the biochemical pool through the bottom flow outlet of the sludge cyclone unit;

[0088] The light sludge is discharged into the residual sludge pipeline through the overflow port of the sludge cyclone unit.

[0089] Exemplary:

[0090] The sludge monitoring probe of the second control and monitoring unit monitors the sludge index in the biochemical pool at a set time interval of 240 minutes. In this example, the sludge index is selected as sludge concentration. Other sludge indexes can be selected in this application and are not limited here.

[0091] When the sludge concentration exceeds the set threshold value of 3000-5000 mg / L, it increases to 6000 mg / L. The second control and monitoring unit generates a start signal to the sludge cyclone unit.

[0092] After receiving the start signal, the sludge cyclone unit introduces the sludge in the return pipeline into the sludge cyclone unit. The sludge is separated from the light and heavy sludge during high-speed rotation. The heavy sludge moves to the bottom of the cyclone device of the sludge cyclone unit under the action of centrifugal force, and flows back to the front end of the biochemical pool through the bottom flow port to participate in the subsequent sewage treatment cycle. The light sludge enters the residual sludge pipeline through the overflow port at the upper part of the cyclone device of the sludge cyclone unit and is discharged from the system. During the cyclone screening process, the rotation speed, inlet pressure and other parameters of the cyclone device can be adjusted according to actual needs to optimize the screening effect. For example, in the case of high sludge concentration and high viscosity, the flow rate of the cyclone device can be appropriately increased to enhance the centrifugal force and improve the screening efficiency.

[0093] In the present invention, light sludge refers to sludge particles with a relatively low density, usually including some light organic matter, fine suspended matter, etc. Heavy sludge refers to sludge particles with a relatively high density, usually including sand particles, heavy organic matter, inorganic particles, etc.

[0094] It also includes water quality fluctuation analysis, which is used to conduct in-depth analysis of the concentration change data of each pollutant indicator.

[0095] The water monitoring probe of the first control and monitoring unit monitors the pollutant indicators of the sewage in the biochemical pool at set time intervals; obtains the change amount of the pollutant indicators at adjacent moments, and records the change trend and change time; obtains the number of change moments and the duration of each change based on the change trend and change time; screens the main pollutant indicators that have changed; determines whether the water quality fluctuation meets the requirements based on the number of change moments and the duration of each change; if not, the bacterial fermentation unit expands the culture of the exclusive bacterial species based on the main pollutant indicators that have changed.

[0096] Exemplary: Taking COD data as an example, the water monitoring probe of the first control and monitoring unit monitors the pollutant index of the sewage in the biochemical pool at a time interval of every 120 minutes;

[0097] Get the change in COD for 120 consecutive minutes. If it is found that COD rises from 100mg / L to 120mg / L at a certain moment, record the concentration change trend as rising, and the change time is the monitoring time. According to the concentration change trend of pollutant indicators at different times and adjacent times, count the number of times when the concentration changes. For example, during a day's monitoring process, it was found that COD had 5 obvious change moments. At the same time, calculate the duration of each change, such as one time the COD concentration rose for 3 hours. If within the statistical period, the number of COD change moments is large and the duration of each change is long, and indicators such as ammonia nitrogen and total phosphorus are relatively stable, then screen and determine COD as the main pollutant indicator that has changed.

[0098] Based on the number of change moments and the duration of each change, it is judged whether the water quality change status meets the established requirements. Assuming that the water quality stability requirement is set as the number of changes in the main pollutant indicators does not exceed 3 times / day and the duration of each change does not exceed 120 minutes, if the COD index exceeds this requirement, it is determined that the water quality fluctuation does not meet the requirements. At this time, the strain control and other treatments can be further carried out according to the operation mechanism of the exclusive strain in-situ production device, such as expanding the cultivation and release of the exclusive strain for COD treatment.

[0099] Also includes sludge fluctuation analysis:

[0100] The sludge monitoring probe of the second control and monitoring unit monitors the sludge indicators in the biochemical pool at set time intervals; records the change time and change range of the sludge indicators; obtains the sludge indicators whose change range exceeds the set threshold; determines whether the sludge fluctuation meets the requirements according to the preset sludge stability requirements; if not, adjusts the operating parameters of the sludge cyclone unit according to the change range.

[0101] Exemplary:

[0102] The sludge monitoring probe of the second control and monitoring unit monitors the sludge index in the biochemical pool at a set time interval of once every 240 minutes to determine the time when the sludge concentration changes. Here, the sludge index is set as the sludge concentration.

[0103] When it is found that the sludge concentration drops from 4000mg / L to 3000mg / L at a certain moment, record the change time and change range. According to the change range of the sludge concentration, screen out the sludge indicators whose change range exceeds the set threshold. If the normal change range of the sludge concentration is set within ±500mg / L, when the sludge concentration is monitored to drop by 1000mg / L at a certain time, it is determined that the sludge concentration indicator has changed significantly. According to the preset sludge stability requirements, judge whether the sludge fluctuation meets the requirements. The preset sludge stability requirements can be selected as: 2 times / day. If it exceeds 2 times / day, it is determined that the sludge fluctuation does not meet the requirements. At this time, the operating parameters of the dense sludge separation device, such as the flow rate and reflux ratio of the sludge cyclone unit, can be adjusted to restore the stable state of the sludge. Or further check other links of the sludge treatment system to restore the stable state of the sludge.

[0104] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that not every embodiment contains only one independent technical solution. In the absence of a conflict of solutions, the various technical features mentioned in each embodiment can be combined in any manner to form other implementation methods that can be understood by those skilled in the art.

[0105] In addition, without departing from the scope of the present invention, the technical solutions described in the aforementioned embodiments may be modified, or some of the technical features may be replaced by equivalents, without causing the essence of the corresponding technical solutions to depart from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for treating petrochemical wastewater, characterized in that: Applicable to the sewage treatment system to be transformed; the biochemical pool of the sewage treatment system to be transformed includes an anaerobic zone and an aerobic zone; the anaerobic zone is used to place denitrifying bacteria, Steinerella, and Phylobacterium fluorescens; The aerobic zone is used for the release of Nitrosomonas and Nitrosomonas; The method comprises: the water monitoring probe of the first control and monitoring unit monitors the pollutant index of the sewage in the biochemical pool; When the pollutant index exceeds the preset threshold, the first control monitoring unit records the excess magnitude and the first excess time; If the pollutant index continues to exceed the preset threshold, a secondary warning will be issued according to the preset rules; The bacterial fermentation unit expands and cultivates exclusive bacterial strains according to pollutant indicators and puts them into the biochemical pool; The cultivation process is based on the dynamic model of bacterial culture: Among them, μ max is the maximum specific growth rate, in h -1 ; S is the pollutant concentration of the sewage in the biochemical pool, in mg / L; K s is the pollutant saturation constant of the sewage in the biochemical pool, in mg / L, indicating the pollutant concentration of the sewage in the biochemical pool when the bacterial growth rate reaches half of the maximum value; The temperature regulation process is based on the temperature regulation model: Among them, T new is the adjusted culture temperature, in °C; T base is the reference temperature, unit is °C; Δμ is the change in specific growth rate, unit is h -1 ; ΔT is the effect coefficient of temperature change on growth rate, unit: h -1 / ℃;μ target is the target specific growth rate, in h -1 ;μ current is the current specific growth rate in h -1 ; The amount of strains released is based on the release model: Among them, Q is the amount of bacteria added, unit is g; V is the volume of the biochemical pool, unit is m 3 ; C pollutant is the pollutant concentration of the sewage in the biochemical pool, in mg / L; K eff is the removal efficiency of the strain on pollutants, in mg / mg; Y is the growth rate of the strain, in g / g; μ current is the current specific growth rate, in h -1 .

2. A petrochemical wastewater treatment method as claimed in claim 1, characterized in that: Also includes: The sludge monitoring probe of the second control and monitoring unit monitors the sludge index in the biochemical pool; When the sludge index exceeds the set threshold, the inlet of the sludge cyclone unit receives the sludge in the sludge return pipeline connection, and the sludge cyclone unit separates the light and heavy sludge; The heavy sludge flows back to the front end of the biochemical pool through the bottom flow outlet of the sludge cyclone unit; The light sludge is discharged into the residual sludge pipeline through the overflow port of the sludge cyclone unit.

3. A petrochemical wastewater treatment method as claimed in claim 2, characterized in that: Also includes water quality fluctuation analysis: The water monitoring probe of the first control and monitoring unit monitors the pollutant index of the sewage in the biochemical pool at a set time interval; Obtain the changes in pollutant indicators at adjacent moments, and record the change trends and change times; According to the change situation and change time, obtain the number of change moments and the duration of each change; Screening of major pollutant indicators that have changed; According to the number of change moments and the duration of each change, determine whether the water quality fluctuation meets the requirements; If it does not meet the requirements, the bacterial strain fermentation unit will expand the culture of the exclusive bacterial strain based on the main pollutant indicators that have changed.

4. A petrochemical wastewater treatment method as claimed in claim 3, characterized in that: Also includes sludge fluctuation analysis: The sludge monitoring probe of the second control and monitoring unit monitors the sludge index in the biochemical pool at a set time interval; Record the time and range of changes in sludge indicators; Obtain sludge indicators whose fluctuations exceed the set threshold; According to the preset sludge stability requirements, determine whether the sludge fluctuation meets the requirements; If not, the operating parameters of the sludge cyclone unit are adjusted according to the variation range.

5. A petrochemical wastewater treatment system, characterized in that: Applicable to the sewage treatment system to be transformed; Applicable to the sewage treatment system to be transformed; The biochemical pool of the sewage treatment system to be transformed includes an anaerobic zone and an aerobic zone; Denitrifying Bacillus, Steinerella, and Aerobacterium fluorescens are placed in the anaerobic zone; Nitrosomonas and Nitrosomonas are placed in the aerobic zone; The system comprises an exclusive bacterial strain in-situ production device for introducing the exclusive bacterial strain into the sewage treatment system to be transformed and a dense sludge separation device for screening the sludge in the sewage treatment system to be transformed.

6. A petrochemical wastewater treatment system as claimed in claim 5, characterized in that: The dedicated strain in-situ production device comprises: a strain fermentation unit and a first control and monitoring unit; The strain introduction ports of the strain fermentation unit are respectively placed in the anaerobic zone and the aerobic zone of the biochemical pool; The water monitoring probe of the first control and monitoring unit is placed in the water of the biochemical pool.

7. A petrochemical wastewater treatment system as claimed in claim 6, characterized in that: The dense sludge separation device comprises: a sludge cyclone unit and a second control and monitoring unit; The inlet of the sludge cyclone unit is connected to the sludge return pipeline, the underflow port of the sludge cyclone unit is connected to the front end of the biochemical pool, and the overflow port of the sludge cyclone unit is connected to the residual sludge pipeline; The sludge monitoring probe of the second control and monitoring unit is placed in the sludge of the biochemical pool.

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