CN113860633A

CN113860633A - Integrated sewage treatment device and method for expressway service area

Info

Publication number: CN113860633A
Application number: CN202111074892.6A
Authority: CN
Inventors: 白雪冰; 杨小丽; 夏阳光; 刘松; 陈鹏; 吴佳帧; 吴正运; 张君
Original assignee: Southeast University; China Design Group Co Ltd
Current assignee: Southeast University; China Design Group Co Ltd
Priority date: 2021-09-14
Filing date: 2021-09-14
Publication date: 2021-12-31
Anticipated expiration: 2041-09-14
Also published as: CN113860633B

Abstract

The invention discloses an integrated sewage treatment device and method for a highway service area, and belongs to the field of water treatment. The device comprises a water inlet pipe; the adjusting tank is communicated with the outlet of the water inlet pipe; the multi-stage AO pool is arranged beside the regulating pool and comprises a plurality of anoxic pools and aerobic pools which are alternately arranged; the membrane bioreactor is arranged in the last stage aerobic tank; the water outlet pump outputs the treated sewage; a first biological carrier is arranged in the regulating tank and each aerobic tank, and a second biological carrier is arranged in the anoxic tank; the system also comprises a water inlet flow distribution module which distributes the sewage in the regulating tank to each anoxic tank; and the aeration module comprises an aeration disc arranged in the last stage aerobic tank and membrane aeration pipes arranged in other aerobic tanks. The invention can utilize the carbon source in the inlet water to the maximum extent to carry out biological denitrification, and improve the effect of removing the sludge concentration reinforced pollutants by the biomembrane method, and the invention can achieve the purpose of reducing the water quantity, reducing the water quality impact load, ensuring the outlet water to reach the standard stably and effectively controlling the membrane pollution.

Description

Integrated sewage treatment device and method for expressway service area

Technical Field

The invention belongs to the technical field of water treatment, and particularly relates to an integrated sewage treatment device and method for a highway service area.

Background

The expressway service area is an important component of an expressway service system, facilities such as restaurants, supermarkets, public toilets, gas stations, automobile repair stations, worker dormitories and the like are generally built in the expressway service area, the services such as catering, rest, accommodation, automobile repair and the like are provided for travelers, and the expressway service area has important significance in guaranteeing traffic and transportation safety, relieving fatigue of drivers and passengers and improving transportation service efficiency.

In recent years, the expressway career of China is rapidly developed until 2018, 13.79 kilometers of expressways are built in China, more than 2700 pairs of expressway service areas are built, the economic value and the ecological influence of the expressway service areas are also widely concerned with the development of the expressway service areas facing to the direction of diversification of culture, diversification of facilities and individuation of service, the services such as catering, public toilets, accommodation, steam repair and the like provided by the expressway service areas generate certain economic value, but the influence of sewage discharge generated at the same time is not ignored, most of the expressway service areas are far away from town areas, the generated sewage can not be discharged into municipal pipe networks generally, the sewage treatment facilities are required to be built on site, but the problems of unreasonable design of treated water quantity, large impact load of sewage quality and water quantity, lack of effective maintenance management and the like exist in the built sewage treatment facilities, so that the sewage treatment is difficult to discharge stably, certain pollution is caused to farmlands, lakes and rivers around the service area of the expressway, and the water environment around the expressway is seriously influenced.

Because the sewage of the expressway service area mainly comprises restaurant catering wastewater and public toilet excrement wastewater, which account for more than 85% of the total sewage, the nitrogen and phosphorus concentration in the sewage is 2-5 times of that of typical urban sewage, the difficulty of nitrogen and phosphorus removal is high, the excrement wastewater treated by a septic tank and the catering wastewater passing through an oil separation tank directly enter a biochemical tank, the biochemical requirement of the sewage is met, but macromolecular substances can be effectively decomposed differently from the sewage conveyed by a long-distance pipe network in urban sewage treatment, the expressway service area does not have the long-distance pipe network and a large regulating tank, the macromolecular substances cannot be effectively degraded, microorganisms are difficult to fully utilize, and the quality of effluent water cannot reach the standard; meanwhile, the sewage treatment scale is small, but the sewage amount is large in change and uneven, due to factors such as weather, seasons, time periods and other special conditions, the randomness of vehicles is large, water is intensively fed for 8-18 hours in one day, the sewage amount has large fluctuation, and the sewage treatment difficulty is large after the sewage is continuously stabilized and reaches the standard.

Therefore, the problems of high water quality impact load, high standard-reaching difficulty of low carbon nitrogen ratio sewage treatment, poor operation stability and the like in the expressway service area are solved, and the method is increasingly urgent.

Disclosure of Invention

In order to solve at least one of the above-mentioned technical problems, according to an aspect of the present invention, there is provided a highway service area integrated sewage treatment plant, comprising:

a water inlet pipe for inputting sewage;

the adjusting tank is communicated with the outlet of the water inlet pipe;

the multi-stage AO pool is arranged beside the regulating pool and comprises a plurality of anoxic pools and aerobic pools which are alternately arranged, and adjacent pools are communicated with each other;

the membrane bioreactor is arranged in the last stage aerobic tank;

the water outlet pump is communicated with the membrane bioreactor through a pipeline and outputs the treated sewage;

a first biological carrier is arranged in the regulating tank and each aerobic tank, and a second biological carrier is arranged in the anoxic tank; also comprises the following steps of (1) preparing,

the influent water flow distribution module is communicated with the regulating tank and distributes sewage in the regulating tank to each anoxic tank; and the number of the first and second groups,

and the aeration module comprises an aeration disc arranged in the last stage aerobic tank and membrane aeration pipes arranged in other aerobic tanks.

According to the embodiment of the invention, the integrated sewage treatment device for the expressway service area optionally further comprises a backflow adjusting module, which comprises:

one end of the return pipeline is communicated with the last stage aerobic tank, and the other end of the return pipeline is respectively communicated with the first stage anoxic tank and the regulating tank;

the reflux pump is arranged on the reflux pipeline and used for conveying the liquid from one end of the reflux pipeline to the other end of the reflux pipeline;

the first reflux valve controls the opening and closing of the end part of a reflux pipeline at the regulating tank;

and the second reflux valve controls the opening and closing of the end part of the reflux pipeline at the first-stage anoxic tank.

According to the integrated sewage treatment device for the expressway service area, disclosed by the embodiment of the invention, optionally, the second biological carrier is an iron-carbon-based composite biological carrier.

According to the integrated sewage treatment device for the expressway service area, disclosed by the embodiment of the invention, optionally, the biological carrier is formed by uniformly coating solid matters with a filler ball after the solid matters are mixed and soaked in 20-40-mesh corncob powder for 3 hours in a 2% NaOH solution after acid pickling pretreatment of zero-valent iron with the particle size of 5-8 mm and the addition amount of 120 g/L.

According to the integrated sewage treatment device for the expressway service area, provided by the embodiment of the invention, optionally, the first biological carriers are arranged in a plurality of rows in the aerobic tank, and the membrane aeration pipes surround the upper side and the lower side of each row of the first biological carriers in the aerobic tank.

According to another aspect of the invention, the integrated sewage treatment method for the expressway service area is provided, based on the integrated sewage treatment device for the expressway service area, sewage enters the regulating tank through the water inlet pipe and stays for 6-12 hours, the aeration modules continuously work, then the sewage in the regulating tank is distributed into the anoxic tanks through the water inlet flow distribution modules and stays for 1-3 hours, then the sewage enters the adjacent aerobic tanks and stays for 3-5 hours, and the membrane bioreactor in the last stage of aerobic tank discharges the treated sewage through the water outlet pump.

According to the integrated sewage treatment method for the expressway service area, optionally, when sewage treatment is carried out in a peak leveling period, the water inlet flow distribution module is used for feeding water with the sewage input amount of the water inlet pipe being 0.8-1.2 times, the reflux pump and the reflux valve II of the reflux adjusting module are opened, the reflux valve I is closed, and the water outlet pump is used for discharging water with the sewage input amount of the water inlet pipe being 0.8-1.2 times;

when sewage treatment is carried out in an alternate period, the water outlet pump discharges half volume of sewage in the integrated sewage treatment device within 1-2 hours, and then the integrated sewage treatment device stops running for 2-3 hours, at the moment, the water inlet flow distribution module is closed, the reflux pump and the reflux valve II of the reflux regulation module are opened, and the reflux valve I is closed;

when sewage treatment is carried out in a peak period, the water inlet flow distribution module feeds water by 1.5-2 times of the water inlet flow distribution module in a peak period, the water outlet pump discharges water by 1.5-2 times of the water outlet flow of the water outlet pump in the peak period, and the reflux pump, the reflux valve I and the reflux valve II of the reflux adjusting module are all opened.

According to the integrated sewage treatment method for the expressway service area, provided by the embodiment of the invention, optionally,

the peak time is 7: 00-9: 00a.m., 11:00a.m. -14: 00p.m., and 19: 00-21: 00p.m. in one day;

the alternating period is 2: 00-5: 00a.m. in one day;

the peak-flattening period is other periods in the day.

According to the integrated sewage treatment method for the expressway service area, provided by the embodiment of the invention, optionally, the multistage AO pool of the integrated sewage treatment device for the expressway service area has three stages, and the inflow water flow distribution module supplies water to each stage of anoxic pools according to the inflow water ratio of 3:5: 2.

Advantageous effects

The integrated sewage treatment device for the expressway service area can utilize the carbon source in the inlet water to the maximum extent for biological denitrification, and improves the sludge concentration and enhances the pollutant removal effect through a biofilm method; the nitrogen and phosphorus removal capability of the process is enhanced by adding an iron-carbon-based composite biological carrier in an anoxic zone, and various nitrogen removal ways are realized by adopting a membrane aeration-biomembrane unit in an aerobic zone; the integrated sewage treatment method for the expressway service area of the invention can accelerate the internal reflux of sewage treatment in the peak flattening period and improve the water capacity and treatment load in the peak peaking period by adjusting the sewage treatment mode of the device in a targeted manner through the segmented water inlet and reflux adjusting module based on the water inlet quantity change characteristic of the expressway service area, thereby achieving the purpose of stably reaching the standard by reducing the water quantity impact load and discharging water, and can intermittently operate the membrane bioreactor by matching with the water discharging mode of the intermittent operation of the membrane bioreactor, thereby effectively controlling membrane pollution while reducing the water quantity impact load.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings of the embodiments will be briefly described below, and it is apparent that the drawings in the following description only relate to some embodiments of the present invention and are not limiting on the present invention.

FIG. 1 shows a schematic view of an integrated wastewater treatment plant of the present invention;

FIG. 2 is a schematic view showing the operation of the integrated wastewater treatment plant of the present invention during the peak leveling period;

FIG. 3 shows a schematic view of the integrated wastewater treatment plant of the present invention operating during peak periods;

FIG. 4 is a schematic view showing the operation of the integrated wastewater treatment plant of the present invention after high flux water discharge in alternate periods;

FIG. 5 shows the integrated wastewater treatment unit of the present invention in a flat peak, alternating and peak time of day setting;

reference numerals:

1. a water inlet pipe;

2. a regulating tank;

3. a multi-stage AO cell; 30. an anoxic tank; 300. a first-stage anoxic tank; 301. a secondary anoxic tank; 302. a third-stage anoxic tank; 31. an aerobic tank; 310. a primary aerobic tank; 311. a secondary aerobic tank; 312. a third-stage aerobic tank;

4. a membrane bioreactor;

5. discharging the water pump;

6. a water inflow distribution module;

7. an aeration module; 70. an aeration disc; 71. a membrane aeration pipe; 72. an aerator;

8. a reflux adjustment module; 80. a return line; 81. a reflux pump; 82. a first reflux valve; 83. a second reflux valve;

90. carrying out biological carrier I; 91. and (5) biological carrier II.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the drawings of the embodiments of the present invention. It is to be understood that the embodiments described are only a few embodiments of the present invention, and not all embodiments.

Unless defined otherwise, technical or scientific terms used herein shall have the ordinary meaning as understood by one of ordinary skill in the art to which this invention belongs. The use of "a," "an," "two," and similar referents in the description and claims of this patent application does not indicate any order, quantity, or importance, but rather is used to distinguish one element from another.

Example 1

The existing sewage treatment device for the expressway service area has the problems of high sewage impact load, high nitrogen and phosphorus content and low carbon-nitrogen ratio, and aiming at the problems, the embodiment designs the integrated sewage treatment device for the expressway service area.

As shown in fig. 1, the integrated sewage treatment device for the expressway service area of the embodiment includes a water inlet pipe 1, a regulating tank 2, a multistage AO tank 3, a membrane bioreactor 4, a water outlet pump 5, a water inlet flow distribution module 6, an aeration module 7, a backflow regulating module 8 and a biological carrier; the water inlet pipe 1 is used for inputting sewage into the sewage treatment device, one end of the water inlet pipe 1 is communicated with the septic tank and the oil separation tank, the other end of the water inlet pipe 1 is communicated with the regulating tank 2, the septic tank is used for treating excrement and filtering and precipitating the excrement, the oil separation tank is used for removing grease substances in the restaurant wastewater, then large suspended or floating pollutants in the sewage are intercepted through the grating to prevent a water pump or a pipeline from being blocked, and then the water inlet pipe 1 is introduced;

the adjusting tank 2 of the embodiment is a capacity expansion adjusting tank, and sewage is delivered to the multi-stage AO tank 3 arranged beside the adjusting tank 2 under the distribution of the inflow water flow distribution module 6 after entering the adjusting tank 2;

the multistage AO pool 3 is an anoxic pool 30 and an aerobic pool 31 which are arranged in turn and alternately, namely the anoxic pool 30-the aerobic pool 31-the anoxic pool 30-the aerobic pool 31 …, the arrangement mode forms multistage, and the adjacent anoxic pools 30 and the aerobic pools 31 are communicated with each other;

the bottom of the regulating tank 2 is provided with a water inlet flow distribution pump which is one of the components of the water inlet flow distribution module 6, the water inlet flow distribution module 6 further comprises a water inlet distribution pipeline and a plurality of water inlet distribution valves, one end of the water inlet distribution pipeline is communicated with the water inlet flow distribution pump, the other end of the water inlet distribution pipeline is arranged above each anoxic tank 30, a water injection passage is formed above each anoxic tank 30, and the water flow of each passage is controlled by each water inlet distribution valve, so that the sewage distribution of the regulating tank 2 to each anoxic tank 30 is realized;

in the embodiment, a first biological carrier 90 is arranged in each regulating tank 2 and each aerobic tank 31, the first biological carrier 90 is a common biological carrier for sewage treatment and comprises a nitrifying bacteria carrier and the like, a second biological carrier 91 is arranged in each anoxic tank 30, the second biological carrier 91 is an iron-carbon-based composite biological carrier, and specifically is a biological carrier formed by uniformly wrapping solid matters with the particle size of 5-8 mm and the addition amount of 120g/L zero-valent iron after acid pickling by using a 2% HCl solution and after soaking 20-40 meshes of corncob powder for 3 hours by using a 2% NaOH solution by using filler balls, wherein the iron-carbon-based composite biological carrier added in the embodiment in the anoxic tank 30 can be used as a slow-release carbon source for enhanced denitrification, and iron in the carrier can be adsorbed with phosphorus in sewage, microelectrolysis and flocculation reaction for enhanced dephosphorization;

furthermore, in the embodiment, the membrane bioreactor 4 is arranged in the last stage aerobic tank 31, the water outlet pump 5 is communicated with the membrane bioreactor 4 through a pipeline to output the treated sewage, and in the last stage aerobic tank 31, the first bio-carrier 90 and the membrane bioreactor 4 form a combined unit of a biological membrane-membrane bioreactor 4, so that the sludge is effectively retained in the sewage treatment device, the sludge concentration is improved, and the pollutant removal capacity of the device is improved;

further, the present embodiment is further provided with an aeration module 7, the aeration module 7 includes an aeration disc 70, a membrane aeration pipe 71 and an aerator 72, the aerator 72 is communicated with the aerobic tanks 31 at all levels through pipelines, wherein the aeration disc 70 is arranged in the last aerobic tank 31, the aeration disc 70 is disposed below the membrane bioreactor 4, the aeration disc 70 of the present embodiment is a microporous aeration disc, the membrane aeration pipes 71 are arranged in the aerobic tanks 31 at all levels, the membrane aeration pipes 71 are bubble-free aeration, in the present embodiment, the biological carriers one 90 are arranged in multiple rows in the aerobic tank 31, the membrane aeration pipes 71 surround the upper and lower sides of each row of the biological carriers one 90 in the corresponding aerobic tank 31, thereby forming a membrane aeration-biological membrane unit, so that an aerobic-anoxic-anaerobic zone is formed at the biological carrier position corresponding to the aerobic tank 31, and autotrophic nitrifying bacteria, aerobic heterotrophic bacteria, anoxic denitrifying bacteria can be enabled to form, Multiple strains such as anaerobic ammonium oxidation bacteria and the like are enriched and grown, multiple denitrification ways such as synchronous nitrification and denitrification, short-cut nitrification and denitrification, anaerobic ammonium oxidation and the like are realized, and the influence on the dissolved oxygen concentration of the subsequent anoxic tank 30 is reduced;

in the integrated sewage treatment device for the expressway service area, sewage passing through the regulating tank 2 is distributed into each stage of anoxic tanks 30 of the multistage AO tank 3 through the water inlet flow distribution module 6, denitrifying bacteria in the anoxic tanks 30 utilize a carbon source in the inlet water and nitrate nitrogen and nitrite nitrogen generated by nitrification of the previous stage of aerobic tank 31 to complete denitrification, iron-carbon-based composite biological carriers in the anoxic tanks 30 can be used as carriers attached to denitrifying bacteria while being used as slow-release carbon sources to provide the carbon source for denitrification, and the iron-carbon-based composite biological carriers and phosphate in the water form iron-phosphorus precipitates to remove total phosphorus in the water and can also react with water to generate active oxygen to oxidize pollutants in the water; the sewage treated by the anoxic tank 30 enters the next-stage aerobic tank 31, nitrifying bacteria in the aerobic tank 31 oxidize ammonia nitrogen in the water into nitrate nitrogen and nitrite nitrogen, and the aerobic-anoxic-anaerobic oxygen environment gradient can be effectively controlled due to the membrane aeration-biomembrane unit, so that synchronous nitrification and denitrification, short-cut nitrification and denitrification and anaerobic ammonia oxidation can be realized;

further, the embodiment is further provided with a reflux regulation module 8, the reflux regulation module 8 comprises a reflux pipeline 80, a reflux pump 81, a reflux valve I82 and a reflux valve II 83, the reflux regulation module 8 can reflux the nitrified liquid in the last stage aerobic tank 31 to the regulation tank 2 or the first stage anoxic tank 30, in the peak period of normal sewage yield in one day, the nitrified liquid is refluxed into the first-stage anoxic tank 30 through the reflux adjusting module 8 for denitrification, in the peak period of high sewage yield, the nitrifying liquid flows back to the first-stage anoxic tank 30 and the regulating tank 2 through the backflow regulating module 8, at the moment, the regulating tank 2 has the function of the anoxic tank 30 to strengthen denitrification, meanwhile, the membrane bioreactor 4 and the water outlet pump 5 in the last stage aerobic tank 31 also adjust the water outlet quantity according to different adaptability of sewage yield, so that the stable standard of the outlet water can be ensured while the impact load of the inlet water quantity is reduced.

Aiming at the characteristics of low carbon-nitrogen ratio and low biochemical degree of sewage in the expressway service area, the integrated sewage treatment device of the embodiment strengthens the hydrolysis effect by adding the biological carrier and the dilatation adjusting tank 2, degrades macromolecular substances in the effluent of the septic tank and the effluent of the oil separation tank into small molecular substances, further improves the biochemical degree of sewage, adopts the multi-stage AO tank 3 with sectional water inlet to ensure that a carbon source in the influent is used for denitrification to the maximum extent, and utilizes a biomembrane-membrane bioreactor 4 combined unit to retain sludge in the device, thereby improving the sludge concentration and improving the pollutant removal capacity; aiming at the problems of high nitrogen and phosphorus content and high difficulty in nitrogen and phosphorus removal in a service area of a highway, an iron-carbon-based composite biological carrier is added into an anoxic tank 30 to strengthen nitrogen and phosphorus removal, and a membrane aeration-biomembrane unit is applied to an aerobic tank 31, so that the influence of dissolved oxygen on a subsequent anoxic tank is reduced while the nitrification effect is ensured, and the method is beneficial to realizing various nitrogen removal ways such as synchronous nitrification and denitrification, short-cut nitrification and denitrification, anaerobic ammonia oxidation and the like, saving a carbon source and strengthening nitrogen removal; aiming at the problem of large impact load of sewage quantity in a service area of a highway, the backflow adjusting module 8 is adopted, and the sewage treatment mode of the device can be adjusted in a targeted manner according to the sewage quantity in different time periods, so that the aim of reducing the water quantity, the water quality and impact load and stably discharging the water to reach the standard is fulfilled.

Example 2

The integrated sewage treatment method for the expressway service area in this embodiment is based on the integrated sewage treatment device for the expressway service area in embodiment 1, wherein the multistage AO tank 3 of the sewage treatment device is exemplified by three stages, that is, the multistage AO tank 3 includes a first-stage anoxic tank 300, a first-stage aerobic tank 310, a second-stage anoxic tank 301, a second-stage aerobic tank 311, a third-stage anoxic tank 302, and a third-stage aerobic tank 312, which are sequentially arranged, and the third-stage aerobic tank 312 is the last-stage aerobic tank 31.

After sewage in a service area of the expressway enters a septic tank and an oil separation tank, the sewage enters an adjusting tank 2 through a water inlet pipe 1, the retention time is 6-12 hours, water in the adjusting tank 2 enters a first-stage anoxic tank 300, a second-stage anoxic tank 301 and a third-stage anoxic tank 302 after being subjected to flow distribution through a water inlet flow distribution module 6, the water inlet ratio is 3:5:2, and the hydraulic retention time of each stage of anoxic tank is 1-3 hours; denitrifying bacteria in the first-stage anoxic tank 300 complete denitrification by utilizing a carbon source in the inlet water and nitrate nitrogen and nitrite nitrogen generated by nitrification in the third-stage aerobic tank 312; denitrifying bacteria in the secondary anoxic tank 301 complete denitrification by utilizing a carbon source in the inlet water and nitrate nitrogen and nitrite nitrogen generated by nitrification in the primary aerobic tank 310; denitrifying bacteria in the third-stage anoxic tank 302 complete denitrification by utilizing a carbon source in the inlet water and nitrate nitrogen and nitrite nitrogen generated by nitrification in the second-stage aerobic tank 311; the iron-carbon-based composite biological carrier in the anoxic pond 30 and the phosphate in the water form iron-phosphorus precipitates so as to remove the total phosphorus in the water; the sewage treated by the anoxic tank 30 enters a next-stage aerobic tank 31, nitrobacteria in the first-stage aerobic tank 310, the second-stage aerobic tank 311 and the third-stage aerobic tank 312 oxidize ammonia nitrogen in the water into nitrate nitrogen and nitrite nitrogen, the residence time of each stage of aerobic tank 31 is 3-5 hours, membrane aeration pipes 71 in the first-stage aerobic tank 310 and the second-stage aerobic tank 311 utilize bubble-free aeration to realize synchronous nitrification denitrification, short-cut nitrification denitrification and anaerobic aeration in the aerobic tank 31, a microporous aeration disc 70 is arranged in the third-stage aerobic tank 312 for aeration, a reflux adjusting module 8 in the third-stage aerobic tank 312 reflows nitrified liquid to the first-stage anoxic tank 300 in a flat peak period and reflows to the first-stage anoxic tank 300 and an intensified adjusting tank 2 in a peak membrane biological period, a reactor 4 in the third-stage aerobic tank 312 discharges the treated sewage through a water outlet pump 5, low-flux water in the flat peak period flows out, the high-flux water outlet in the alternate period is stopped for 2-3 hours, high flux water outlet during peak period;

further, the peak flattening period, the alternating period, and the peak period in this embodiment are set at the time of a day as shown in fig. 5, specifically, 7:00 to 9:00a.m., 11:00a.m. to 14:00p.m., and 19:00 to 21:00p.m. in a day are the peak flattening period, 2:00 to 5:00a.m. are the alternating period, and the other periods are the peak flattening period;

at different periods, the regulation and control strategy of the sewage treatment method of the embodiment is shown in the table 1,

TABLE 1 Regulation strategy

In particular to a method for preparing a high-performance nano-silver alloy,

when sewage treatment is carried out in the peak flattening period, as shown in fig. 2, the inflow water flow distribution module 6 carries out low-flow inflow, the reflux pump 81 and the reflux valve II 83 of the reflux regulation module 8 are opened, the reflux valve I82 is closed, and the outflow pump 5 carries out low-flux outflow, at the moment, the nitrified liquid flows back to maintain the first-stage anoxic tank 300 to carry out denitrification;

when sewage treatment is carried out in the peak period, as shown in fig. 3, the inflow water flow distribution module 6 feeds water at a flow rate 1.5-2 times that of the inflow water flow distribution module 6 in the peak-flattening period, the outflow water pump 5 discharges water at a flow rate 1.5-2 times that of the outflow water pump 5 in the peak-flattening period, the reflux pump 81, the reflux valve I82 and the reflux valve II 83 of the reflux regulation module 8 are all opened, and at the moment, the regulation tank 2 has the denitrification effect of the anoxic tank 30 and is used as a part of the anoxic tank 30 to strengthen denitrification;

when sewage treatment is carried out in alternate periods, the water outlet pump 5 discharges half volume of sewage in the integrated sewage treatment device within 1-2 hours, the integrated sewage treatment device stops running for 2-3 hours, at the moment, the inflow water flow distribution module 6 is closed, the reflux pump 81 and the reflux valve II 83 of the reflux regulation module 8 are opened, the reflux valve I82 is closed, as shown in figure 4, after half volume of sewage is discharged, the biological carrier is exposed out of the liquid surface for natural reoxygenation, and the membrane bioreactor 4 can effectively delay membrane pollution in an intermittent running mode, so that the service life of the biological membrane module is prolonged;

the low flux is the sewage input amount of the water inlet pipe 1 which is 0.8-1.2 times, and the high flux is the low flux which is 1.5-2 times.

By the integrated sewage treatment method for the expressway service area, disclosed by the invention, the sewage treatment strategy is adjusted in a targeted manner according to the sewage amount in different periods, so that the internal reflux of sewage treatment is accelerated in a peak period, and the water holding capacity and treatment load are improved in a peak period, so that the aim of reducing the water impact load and stably reaching the standard of the outlet water is fulfilled, meanwhile, the outlet water amount is correspondingly regulated and controlled, and the membrane pollution can be effectively controlled while the water impact load is reduced.

Application example

The sewage treatment device in the embodiment 1 and the sewage treatment method in the embodiment 2 are adopted to treat sewage in a certain expressway service area, and the device is made of organic glass materials, wherein the length of an adjusting tank 2 is 20cm, the width is 40cm, the height is 60cm, the length of a three-stage AO tank is 75cm, the width is 40cm, the height is 60cm, the effective water depth is 40cm, the peak time of the device in operation is set to be 7: 00-9: 00a.m., 11:00a.m. -14: 00p.m., and 19: 00-21: 00p.m., the alternating period is 2: 00-5: 00a.m., and the other time is the peak leveling period.

The water inflow rate in the peak flattening period is 4L/h, the water inflow rate in the peak height period is 8L/h, and the water inflow rate in the alternate period is 0; the water flow rate in the peak leveling period is 4L/h, the water flow rate in the peak leveling period is 8L/h, the operation is stopped for 2h after the water is discharged for 1h at the water flow rate of 60L/h in the alternate period, the reflux ratio of the nitrifying liquid is 100 percent, and the water inlet flow distribution ratio is 3:5: 2; the hydraulic retention time of the adjusting tank 2 is 8 hours, the hydraulic retention time of each anoxic tank 30 is 2 hours, the hydraulic retention time of each aerobic tank 31 is 3 hours, iron-carbon-based composite biological carriers are added into the anoxic tanks 30, the biological carriers are added into the adjusting tank 2 and the aerobic tanks 31, bubble-free aeration is carried out in the first-stage aerobic tank 310 and the second-stage aerobic tank 311 by utilizing a membrane aeration pipe 71, and an aeration disc 70 is arranged in the third-stage aerobic tank 312.

In the operation process, sewage flows into the system through the water inlet pipe through the peristaltic pump, the system continuously operates for 10 months, the quality of the effluent is monitored every 2 days, and after the sewage is treated, COD, ammonia nitrogen, total phosphorus and the like in the effluent stably reach the first-class A standard of pollutant discharge Standard of urban Sewage treatment plant (GB18918-2002), as shown in Table 2.

TABLE 2 test results

Test index	COD(mg/L)	Ammonia nitrogen (mg/L)	Total nitrogen (mg/L)	Total phosphorus (mg/L)
					Inflow water	324.55±40.12	61.78±2.99	62.68±5.01	4.34±0.31
Discharging water	17.30±3.78	2.22±0.45	12.10±1.08	0.27±0.15
					Removal rate	94.54±1.57％	96.34±0.96％	71.98±9.91％	93.85±3.42％

Comparative example

In a comparative example, only 10 cm of spherical polyurethane sponge filler is added into the anoxic tank 30 and the aerobic tank 31, and in other similar application examples, under the condition of the same inlet water quality, the removal rate of COD of the outlet water is 91.11 +/-4.03%, the removal rate of ammonia nitrogen is 88.51 +/-1.50%, the removal rate of total nitrogen is 58.94 +/-10.09%, the removal rate of total phosphorus is-11.08 +/-13.84%, and the total phosphorus does not reach the first-grade A standard of pollutant discharge standard of urban sewage treatment plants (GB 18918-2002).

The examples described herein are merely illustrative of the preferred embodiments of the present invention and do not limit the spirit and scope of the present invention, and various modifications and improvements made to the technical solutions of the present invention by those skilled in the art without departing from the design concept of the present invention shall fall within the protection scope of the present invention.

Claims

1. The utility model provides a highway service area integration sewage treatment plant which characterized in that includes:

a water inlet pipe for inputting sewage;

the adjusting tank is communicated with the outlet of the water inlet pipe;

the membrane bioreactor is arranged in the last stage aerobic tank;

2. The integrated sewage treatment device for expressway service areas according to claim 1, further comprising a backflow regulating module comprising:

3. The integrated sewage treatment device for the expressway service area according to claim 2, wherein: and the biological carrier II is an iron-carbon-based composite biological carrier.

4. The integrated sewage treatment device for the expressway service area according to claim 3, wherein: and the second biological carrier is formed by pickling zero-valent iron with the particle size of 5-8 mm and the addition amount of 120g/L with 2% HCl solution, mixing the pretreated zero-valent iron with solid matters obtained by soaking 20-40 meshes of corncob powder in 2% NaOH solution for 3 hours, and uniformly wrapping the mixture by using filler balls.

5. The integrated sewage treatment device for the expressway service area according to claim 2, wherein: the first biological carriers are arranged in the aerobic tank in a plurality of rows, and the membrane aeration pipes are arranged around the upper side and the lower side of each row of the first biological carriers in the corresponding aerobic tank.

6. An integrated sewage treatment method for a highway service area is characterized by comprising the following steps: the integrated sewage treatment device for the expressway service area as claimed in claims 1 to 5, wherein sewage enters the regulating tank through the water inlet pipe, stays for 6 to 12 hours, the aeration module works continuously, then the sewage in the regulating tank is distributed into each anoxic tank through the water inlet flow distribution module, stays for 1 to 3 hours, then enters the adjacent aerobic tank, stays for 3 to 5 hours, and the membrane bioreactor in the last stage of aerobic tank discharges the treated sewage through the water outlet pump.

7. The integrated sewage treatment method for the expressway service area according to claim 6, wherein:

when sewage treatment is carried out in a peak flattening period, the water inlet flow distribution module feeds water by the sewage input amount of the water inlet pipe which is 0.8-1.2 times of that of the water inlet pipe, the reflux pump and the reflux valve II of the reflux regulation module are opened, the reflux valve I is closed, and the water outlet pump outputs water by the sewage input amount of the water inlet pipe which is 0.8-1.2 times of that of the water outlet pump;

8. The integrated sewage treatment method for the expressway service area according to claim 7, wherein:

the alternating period is 2: 00-5: 00a.m. in one day;

the peak-flattening period is other periods in the day.

9. The integrated sewage treatment method for the expressway service area according to claim 8, wherein: the multi-stage AO pool of the integrated sewage treatment device in the expressway service area has three stages, and the inflow water distribution module feeds water into each stage of anoxic pools according to the inflow water ratio of 3:5: 2.