CN215855627U - Automatic adjustment sewage treatment system suitable for expressway service area - Google Patents
Automatic adjustment sewage treatment system suitable for expressway service area Download PDFInfo
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- CN215855627U CN215855627U CN202023153645.9U CN202023153645U CN215855627U CN 215855627 U CN215855627 U CN 215855627U CN 202023153645 U CN202023153645 U CN 202023153645U CN 215855627 U CN215855627 U CN 215855627U
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Abstract
The utility model discloses an automatic adjustment sewage treatment system suitable for a highway service area, which comprises a first sewage treatment unit, a second sewage treatment unit and a communicating pipe, wherein the first sewage treatment unit and the second sewage treatment unit comprise a pretreatment tank, an adjustment tank, a biological treatment tank, a sedimentation tank, a disinfection tank and a water outlet tank; the regulating tank of the first sewage treatment unit is communicated with the regulating tank of the second sewage treatment unit through a communicating pipe; an ammonia nitrogen online detector, an intercommunication pump and an emergency pump are arranged in the regulating tank, and the biological treatment tank comprises an anoxic zone, a regulating zone, a first aerobic zone and a second aerobic zone. The system has high stability for treating sewage generated in the expressway service area, has low ammonia nitrogen concentration discharge and meets the discharge requirement. The method has flexible treatment mode and low cost, and can effectively avoid the condition that the high-concentration ammonia nitrogen sewage in the peak period produces toxic action on microorganisms of a biochemical system to cause the breakdown of the biochemical system and the effluent exceeds the standard.
Description
Technical Field
The utility model belongs to the technical field of water environment pollution treatment, and particularly relates to an automatic adjustment sewage treatment system suitable for a highway service area.
Background
The sewage of the expressway service area is mainly from excrement wastewater discharged from public toilets, and is characterized in that a pollution factor is ammonia nitrogen, so compared with common domestic sewage, the core problem of the sewage treatment of the expressway service area is in the control of ammonia nitrogen pollution. The quality of the sewage in the service area shows obvious fluctuation under the influence of the change of the flow of people and the flow of vehicles. Taking a certain service area of Guangzhou as an example, the ammonia nitrogen concentration in the sewage of the service area is maintained at a lower level during the period from Monday to Thursday, and generally fluctuates between 38 and 76 mg/L; during the period from friday to sunday, the ammonia nitrogen concentration of the sewage is maintained at a higher level and fluctuates between 80 and 153mg/L along with the increase of the traffic flow; during a high peak period (such as a holiday in a festival where the toll is suspended on a highway specified by the state), the traffic flow and the people flow in a service area are both increased sharply, a washroom is always operated at full load, and the ammonia nitrogen concentration of the sewage can be increased by 6 times compared with that of the sewage in a weekday. Therefore, except that the water quality fluctuation is large, the sewage in the expressway service area also has the characteristic of high ammonia nitrogen concentration in the peak period. Relevant researches show that the activity of microorganisms, particularly nitrosobacteria and nitrobacteria, in a biochemical system can be inhibited when the ammonia nitrogen concentration of inlet water is too high, and the sewage treatment efficiency is reduced; the long-term high impact load can also cause microorganisms to generate excessive extracellular polymeric substances, so that the volume index of the sludge is increased, and further, the sludge is expanded, and a biochemical system is collapsed.
Therefore, the capability of the sewage treatment facility in the expressway service area to deal with the service area sewage with unstable water quality and high ammonia nitrogen concentration needs to be improved so as to prevent the pollution of the surrounding water environment and the ecological damage caused by the over-standard discharge of the sewage.
At present, the removal of ammonia nitrogen in sewage is mainly realized by an A/O process and by means of nitrosation reaction of nitrifying bacteria and nitration reaction of nitrifying bacteria in an aerobic tank. The research shows that the extension of the hydraulic retention time of the aerobic tank is beneficial to the implementation of the nitration reaction. In order to improve the adaptability of sewage treatment facilities to rural sewage with large change of water inlet load and the removal efficiency of COD and TN, the utility model patent with application number of 201811471504.6 discloses a multistage AO-MBBR process sewage treatment device and a multistage AO-MBBR process sewage treatment method with adjustable stages. However, the automation of the patent is poor, and the water quality needs to be detected and the position of the inserting plate needs to be adjusted manually; in addition, compared with rural sewage, the change range of the quality of the sewage in the expressway service area is larger, the ammonia nitrogen concentration of the sewage in the peak period can reach 300mg/L, and the sewage treatment device can not adapt to the impact load of the sewage in the expressway service area in the peak period, so that the biochemical system is broken down.
Therefore, it is necessary to develop an automatically adjusting sewage treatment system specially adapted for the service area of the expressway.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide an automatic adjustment sewage treatment system suitable for an expressway service area, which has the advantages of high stability in treating sewage generated by the expressway service area, low ammonia nitrogen concentration discharge, accordance with discharge requirements, flexible mode and low cost, and can effectively avoid the situation that the collapse of a biochemical system and the effluent exceed standard caused by the toxic action of high-concentration ammonia nitrogen sewage on microorganisms of the biochemical system in a peak period.
The above object of the present invention can be achieved by the following technical solutions: an automatically regulated sewage treatment system suitable for use in a highway service area, comprising:
the first sewage treatment unit is positioned in a service area on one side of the expressway;
the second sewage treatment unit is positioned in a service area on the opposite side of the expressway;
a communicating pipe between the first sewage treatment unit and the second sewage treatment unit;
the first sewage treatment unit and the second sewage treatment unit respectively comprise a pretreatment tank, an adjusting tank, a biological treatment tank, a sedimentation tank, a disinfection tank and a water outlet tank;
the regulating tank of the first sewage treatment unit is communicated with the regulating tank of the second sewage treatment unit through a communicating pipe;
an ammonia nitrogen online detector, an intercommunicating pump and an emergency pump are arranged in the regulating tank;
the biological treatment pool comprises an anoxic zone, an adjustable zone, a first aerobic zone and a second aerobic zone.
In the above automatically-adjusting sewage treatment system for a service area of a highway:
preferably, an aeration device and a dissolved oxygen monitor are arranged in the anoxic zone, the adjustable zone, the first aerobic zone and the second aerobic zone.
Preferably, a nitrified liquid reflux device is further arranged between the second aerobic zone and the anoxic zone.
Preferably, the concentration of dissolved oxygen in the first aerobic zone and the second aerobic zone is controlled to be 2.0-4.0 mg/L, and the concentration of the anoxic zone is controlled to be 0.2-0.5 mg/L.
Preferably, the first sewage treatment unit and the second sewage treatment unit both further comprise emergency sewage treatment units, and the emergency sewage treatment units are arranged between the regulating tank and the disinfection tank.
Preferably, the emergency sewage treatment unit comprises a dosing reaction zone and a precipitation zone.
Preferably, a clear water reflux pump for refluxing the effluent in the effluent pool to the regulating pool is further arranged in the effluent pool.
Preferably, the bottom of the sedimentation tank is also provided with a pipeline which is communicated with the anoxic zone and is used for sludge backflow.
The method for automatically adjusting the sewage treatment system applicable to the expressway service area comprises the following steps:
(1) setting the average intake ammonia nitrogen concentration at a low traffic flow time period in a weekday as a first control value, setting the average intake ammonia nitrogen concentration at a high traffic flow time period in the weekday as a second control value, and setting the average intake ammonia nitrogen concentration at a peak time period in a holiday as a third control value;
(2) when the ammonia nitrogen online detector detects that the concentration of the inlet water ammonia nitrogen of the regulating tank is smaller than a first preset value, the adjustable zone is set as an anoxic zone, namely the concentration of dissolved oxygen is controlled to be 0.2-0.5 mg/L, and the first sewage treatment unit and the second sewage treatment unit operate respectively to treat sewage generated by a single-side service zone;
(3) when the ammonia nitrogen online detector detects that the concentration of the inlet water ammonia nitrogen of the regulating tank is larger than or equal to a first preset value and smaller than a second preset value, the adjustable zone is set as an aerobic zone, namely the concentration of dissolved oxygen is controlled to be 2.0-4.0 mg/L, and the first sewage treatment unit and the second sewage treatment unit operate respectively to treat sewage generated by a single-side service zone;
(4) when the ammonia nitrogen online detector detects that the concentration of the inlet water ammonia nitrogen of the regulating reservoir is greater than or equal to a second preset value and less than a third preset value, the intercommunicating pump is started, the regulating reservoirs of the first sewage treatment unit and the second sewage treatment unit are intercommunicated, and the sewage treatment units on the two sides cooperatively treat sewage;
(5) and when the ammonia nitrogen online detector detects that the ammonia nitrogen concentration of the inlet water of the regulating tank is larger than or equal to a third preset value, the emergency pump is started, the regulating tank conveys sewage to the emergency sewage treatment units to treat the sewage exceeding the treatment capacity of the two sewage treatment units in a peak period, the clear water reflux pump is started, and the outlet water in the outlet tank flows back to the regulating tank.
In the above automatically regulated sewage treatment method suitable for the service area of the expressway:
the first preset value is 20-40 mg/L, the second preset value is 70-90 mg/L, and the third preset value is 140-160 mg/L.
The traffic flow in the low traffic flow period of the weekday is 3000 or less vehicle times/day, the traffic flow in the high traffic flow period of the weekday is 3000-5500 vehicle times/day, and the traffic flow in the peak period of the holidays is 5500-8000 and above vehicle times/day.
Compared with the prior art, the utility model has the following advantages:
(1) the utility model introduces an automatic control aeration regulating reservoir (namely the adjustable area) based on the control of the ammonia nitrogen concentration of inlet water in the A/O process, and combines the sewage treatment unit communication technology and the emergency physicochemical treatment technology of the two service areas to develop an automatic regulation sewage treatment system aiming at the sewage of the expressway service area with large water quality fluctuation and high ammonia nitrogen concentration;
(2) the utility model arranges two sections of aerobic aeration tanks (a first aerobic zone and a second aerobic zone) in an A/O process, prolongs the hydraulic retention time (12-16 hours) of the aerobic zones, improves the removal rate of ammonia nitrogen by a biochemical treatment system, adds an automatic control aeration regulating tank based on the control of the concentration of ammonia nitrogen of inlet water, has low aeration intensity when the concentration of the ammonia nitrogen of the inlet water is low, is an anoxic tank, has a hydrolysis acidification function, decomposes difficultly-degraded organic matters in sewage into easily-degraded organic matters, is beneficial to the removal of COD by the subsequent aerobic tank, ensures the normal progression of nitration reaction and the effective removal of ammonia nitrogen, has high concentration of the ammonia nitrogen of the inlet water at the traffic peak time of a service area, increases the aeration intensity of the adjustable tank, regulates the aerobic tank, further improves the effective volume of the aerobic zones, increases the hydraulic retention time of the aerobic tanks, and strengthens the degradation of the biochemical system to the ammonia nitrogen, the arrangement of the automatic control aeration regulating tank enhances the flexibility and adaptability of the system to the sewage in the service area of the expressway, controls the aeration strength of the tank body according to the concentration of the ammonia nitrogen of the inlet water, saves the operation cost and avoids the energy waste;
(3) according to the utility model, the sewage treatment units on the two sides are communicated, so that the sewage treatment units on the two sides can cooperatively treat high-concentration sewage in a peak period, and sewage treatment facilities can be fully utilized;
(4) the emergency sewage treatment unit is arranged to treat sewage exceeding the treatment capacity of the sewage treatment units on two sides in an extra-large peak period, and the clear water reflux pump is arranged to dilute high-concentration sewage, so that the sewage load of a subsequent biochemical treatment system is reduced, and the normal operation of the system is ensured.
Drawings
FIG. 1 is a schematic view of an automatically adjusting sewage treatment system in embodiment 1 of the present invention;
FIG. 2 is a flow chart of an automatic adjustment sewage treatment system in embodiment 1 of the present invention;
FIG. 3 is a plan view of a biochemical treatment tank in example 1 of the present invention;
FIG. 4 is a plan view of an emergency sewage treatment unit in example 1 of the present invention;
FIG. 5 is a flow chart of a sewage treatment system of a comparative example.
Detailed Description
The present invention is further specifically described below by way of examples, but the embodiments of the present invention are not limited thereto.
Example 1
As shown in fig. 1-2, the present embodiment provides an automatic adjustment sewage treatment system suitable for a service area of a highway, comprising:
the first sewage treatment unit is positioned in a service area on one side of the expressway;
the second sewage treatment unit is positioned in a service area on the opposite side of the expressway;
a communicating pipe between the first sewage treatment unit and the second sewage treatment unit;
the first sewage treatment unit and the second sewage treatment unit respectively comprise a pretreatment tank, an adjusting tank, a biological treatment tank, a sedimentation tank, a disinfection tank and a water outlet tank;
the regulating tank of the first sewage treatment unit is communicated with the regulating tank of the second sewage treatment unit through a communicating pipe;
and an ammonia nitrogen online detector, an intercommunicating pump (a common pump which is opened when needed and is used for introducing sewage in the regulating reservoir on one side into the regulating reservoir on the other side) and an emergency pump (a common emergency pump which is opened when needed) are arranged in the regulating reservoir.
The biological treatment pool comprises an anoxic zone, an adjustable zone, a first aerobic zone and a second aerobic zone.
The pretreatment tank comprises a grating and an oil separation tank and is used for removing large-particle inorganic matters and oily substances.
The biological treatment tank is used for decomposing organic matters and removing nitrogen and phosphorus.
The sedimentation tank is used for separating mud and water.
The disinfection tank is used for killing pathogens and the like.
Sewage generated by a service area on one side of the highway passes through a grating, an oil separation tank, an adjusting tank, a biological treatment tank, a sedimentation tank, a disinfection tank and a water outlet tank in sequence in a first sewage treatment unit, and is finally discharged to a peripheral water body or a municipal sewage pipe network.
Similarly, sewage generated by the service area on the opposite side of the highway passes through the grating, the oil separation tank, the regulating tank, the biological treatment tank, the sedimentation tank, the disinfection tank and the water outlet tank in sequence in the second sewage treatment unit, and is finally discharged to a peripheral water body or a municipal sewage pipe network in a reaching standard.
An aeration device and a dissolved oxygen monitor are arranged in the anoxic zone, the adjustable zone, the first aerobic zone and the second aerobic zone.
And a nitrifying liquid reflux device is also arranged between the second aerobic zone and the anoxic zone.
The concentration of dissolved oxygen in the first aerobic zone and the second aerobic zone is controlled to be 2.0-4.0 mg/L, and the concentration of the anoxic zone is controlled to be 0.2-0.5 mg/L.
Specifically, fig. 3 is a plan view of a biological treatment tank, a tank body of the biological treatment tank is divided into four areas by partition plates, the four areas are respectively an anoxic area, an adjustable area, a first aerobic area and a second aerobic area from front to back according to a water inlet direction, each area is provided with an independent aeration device 1 and a dissolved oxygen monitor 2, the upper part of the second aerobic area is provided with a nitrifying liquid reflux device 3 so as to reflux nitrifying liquid in the second aerobic area to the anoxic area, the dissolved oxygen in the anoxic area is controlled to be 0.2-0.5 mg/L, the dissolved oxygen in the first aerobic area and the dissolved oxygen in the second aerobic area are controlled to be 2.0-4.0 mg/L, and the dissolved oxygen concentration in the adjustable area is adjusted according to the ammonia nitrogen concentration of inlet water to control the aeration intensity.
As shown in fig. 1 and 2, the first sewage treatment unit and the second sewage treatment unit both further comprise an emergency sewage treatment unit, and the emergency sewage treatment unit is arranged between the regulating tank and the disinfection tank.
The emergency sewage treatment unit comprises a dosing reaction area and a precipitation area, as shown in figure 4.
The dosing reaction zone can adopt one or more combined processes of an MAP precipitation method, a zeolite denitrification method, a PAC/PAM coagulating sedimentation method, an air stripping method and an advanced oxidation method, the embodiment adopts the combined process of the MAP precipitation method and the PAC/PAM coagulating sedimentation method, as shown in figure 4, the emergency sewage treatment unit comprises a dosing reaction zone and a precipitation zone, sewage entering the emergency sewage treatment unit sequentially passes through the dosing reaction zone and the precipitation zone and finally enters the disinfection tank, wherein a water passing tank is arranged in front of the precipitation zone, and a water outlet weir is arranged above the precipitation zone.
And the water outlet pool is also internally provided with a clear water reflux pump for refluxing the outlet water in the water outlet pool to the regulating pool.
And a pipeline which is communicated with the anoxic zone and is used for sludge backflow is also arranged at the bottom of the sedimentation tank.
The operation of the system, namely the automatic adjustment sewage treatment method suitable for the expressway service area, comprises the following steps:
the operation of the automatically-adjusted sewage treatment system suitable for the expressway service area provided by the embodiment is that the ammonia nitrogen concentration of inlet water detected by the ammonia nitrogen online detection device is used as a control index, according to the water quality characteristics of the expressway service area, the average ammonia nitrogen concentration of inlet water in a low traffic flow time period (3000 driver times per day) in weekdays is set as a first control value (20-40 mg/L), the average ammonia nitrogen concentration of inlet water in a high traffic flow time period (3000-5500 driver times per day) in weekdays is set as a second control value (70-90 mg/L), and the average ammonia nitrogen concentration of inlet water in a peak time period (5500-8000 driver times per day) in holidays is set as a third control value (140-160 mg/L).
When the concentration of ammonia nitrogen in inlet water is less than 40mg/L, the concentration of dissolved oxygen in the adjustable zone is controlled to be 0.2-0.5 mg/L and is in an anoxic state, the two sewage treatment units operate respectively to treat sewage in the unilateral highway service zone, at the moment, C/N in the sewage is high, high-concentration organic matters are not beneficial to carrying out nitration reaction, the adjustable zone is set as the anoxic zone, the degradation of the organic matters is facilitated, the concentration of the organic matters in the sewage entering the aerobic zone is reduced, the normal operation of the nitration reaction is ensured, and the ammonia nitrogen is effectively removed.
When the concentration of the ammonia nitrogen in the inlet water is less than or equal to 40mg/L and less than 80mg/L, the aeration system of the adjustable area enhances aeration, the concentration of dissolved oxygen is controlled to be 2.0-4.0 mg/L, the two sewage treatment units are in an aerobic state, the two sewage treatment units operate respectively to treat the sewage generated by the expressway service area on one side, at the moment, the C/N in the sewage is reduced, the adjustable area is set as the aerobic area, the hydraulic retention time of the aerobic area can be prolonged, the efficiency of nitration reaction is improved, and the degradation of the ammonia nitrogen by the biochemical system is enhanced.
When the ammonia nitrogen concentration of the inlet water is less than or equal to 80mg/L and less than 150mg/L, the ammonia nitrogen concentration in the sewage exceeds the treatment capacity of the single-side sewage treatment system, and the high-concentration ammonia nitrogen easily generates toxic action on the biochemical system, so that the intercommunicating pump is started to convey the sewage to the regulating reservoir of the sewage treatment unit at the other side, the sewage treatment units generated in the expressway service areas at the two sides cooperatively treat the sewage, the treatment load of the single-side sewage treatment system is reduced, and the utilization rate of the double-side sewage treatment system is improved.
When the traffic flow and the people flow on one side of the expressway service area are large, and the traffic flow and the people flow in the opposite expressway service area are relatively small, if the traffic flow and the people flow are high, the ammonia nitrogen concentration exceeds the treatment capacity of the single-side sewage treatment system, the intercommunicating pump in the adjusting tank on the side can be started, sewage is introduced into the adjusting tank on the opposite side, the sewage treatment units on the two sides can cooperatively treat the sewage, the treatment load of the single-side sewage treatment system is reduced, and the utilization rate of the double-side sewage treatment system is improved.
If the sewage treatment units on the two sides still can not meet the treatment requirement of ammonia nitrogen in sewage, the emergency pump can be further started, and sewage is further treated by adopting the emergency sewage treatment unit.
When the ammonia nitrogen concentration of the inlet water is more than or equal to 150mg/L, the ammonia nitrogen concentration in the sewage exceeds the treatment capacity of the sewage treatment systems at two sides, so that the power of the intercommunicating pump is not increased any more, and the sewage quantity conveyed from the sewage treatment unit at one side to the sewage treatment unit at the other side is not increased any more; the emergency pump is started to convey sewage to the emergency sewage treatment units so as to treat the sewage exceeding the treatment capacity of the two sewage treatment units in the peak period; the clear water reflux pump is started to reflux the effluent reaching the standard of the system to the regulating tank to dilute the high-concentration sewage, so that the sludge load of subsequent biochemical treatment facilities is reduced, and the normal operation of the system is ensured.
When the traffic flow and the passenger flow on two sides of the expressway service area are large and the ammonia nitrogen concentration in the sewage exceeds the treatment capacity of the sewage treatment systems on two sides, the emergency pump can be started, the sewage is further treated by the emergency sewage treatment unit, and the clear water reflux pump is started at the same time, so that the sewage can be discharged up to the standard.
When the automatic adjustment sewage treatment system is applied, the ammonia nitrogen concentration of inlet and outlet water of the system is shown in the table 1. The results show that under different working conditions, the system can effectively remove ammonia nitrogen in the sewage, so that the ammonia nitrogen concentration of the outlet water reaches the standard and is discharged, and the system has stronger flexibility and adaptability to the sewage of the expressway service area.
TABLE 1 Ammonia Nitrogen concentration of the influent and effluent
Note: the effluent water is subjected to the second time period primary standard of local standard 'water pollutant discharge limit' of Guangdong province (DB 44/26-2001).
Comparative example
The sewage treatment system of a certain expressway service area is shown in fig. 5, and sewage enters the sewage treatment system, passes through the mechanical grating, the regulating tank, the anoxic tank, the aerobic tank and the sedimentation tank in sequence, and is finally disinfected and discharged. The water quality conditions of inlet and outlet water are shown in table 2, and the detection results show that the system only has certain treatment effect on low-concentration sewage, and when the concentration of ammonia nitrogen is increased, the removal capacity of the system is reduced, and the standard discharge of outlet water cannot be ensured. It is worth noting that the removal rate of the system to ammonia nitrogen is only 6.7% in the extra-large peak period, which indicates that the concentration of pollutants is increased sharply in the extra-large peak period, and huge impact load causes the complete collapse of the biochemical system.
TABLE 2 Ammonia Nitrogen concentration of the influent and effluent
Note: the effluent water is subjected to the second time period primary standard of local standard 'water pollutant discharge limit' of Guangdong province (DB 44/26-2001).
The present invention is illustrated by the following examples, which are not intended to limit the scope of the utility model. Other insubstantial modifications and adaptations of the present invention can be made without departing from the scope of the present invention.
Claims (6)
1. An automatically regulated sewage treatment system suitable for use in a highway service area, comprising:
the first sewage treatment unit is positioned in a service area on one side of the expressway;
the second sewage treatment unit is positioned in a service area on the opposite side of the expressway;
a communicating pipe between the first sewage treatment unit and the second sewage treatment unit;
the first sewage treatment unit and the second sewage treatment unit respectively comprise a pretreatment tank, an adjusting tank, a biological treatment tank, a sedimentation tank, a disinfection tank and a water outlet tank;
the regulating tank of the first sewage treatment unit is communicated with the regulating tank of the second sewage treatment unit through a communicating pipe;
an ammonia nitrogen online detector, an intercommunicating pump and an emergency pump are arranged in the regulating tank;
the biological treatment pool comprises an anoxic zone, an adjustable zone, a first aerobic zone and a second aerobic zone.
2. The self-adjusting sewage treatment system suitable for highway service areas of claim 1 wherein: and an aeration device and a dissolved oxygen monitor are arranged in the anoxic zone, the adjustable zone, the first aerobic zone and the second aerobic zone.
3. The automatically regulated sewage treatment system adapted for use in a service area of a highway according to claim 2 wherein: and a nitrifying liquid reflux device is also arranged between the second aerobic zone and the anoxic zone.
4. The automatic conditioning sewage treatment system for service areas of motorways according to any one of claims 1 to 3, characterized in that: the first sewage treatment unit and the second sewage treatment unit both further comprise emergency sewage treatment units, the emergency sewage treatment units are arranged between the regulating tank and the disinfection tank, and the emergency sewage treatment units comprise dosing reaction areas and settling areas.
5. The automatically regulated sewage treatment system adapted for use in a service area of a highway according to claim 4 wherein: and the water outlet pool is also internally provided with a clear water reflux pump for refluxing the outlet water in the water outlet pool to the regulating pool.
6. The self-adjusting sewage treatment system suitable for highway service areas of claim 5 wherein: and a pipeline which is communicated with the anoxic zone and is used for sludge backflow is also arranged at the bottom of the sedimentation tank.
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