CN111777290A

CN111777290A - Petrochemical wastewater treatment method

Info

Publication number: CN111777290A
Application number: CN202010786944.1A
Authority: CN
Inventors: 唐建强
Original assignee: Zhejiang Huaqiang Environmental Technology Co ltd
Current assignee: Zhejiang Huaqiang Environmental Technology Co ltd
Priority date: 2020-08-07
Filing date: 2020-08-07
Publication date: 2020-10-16

Abstract

The invention relates to the technical field of petrochemical wastewater treatment, in particular to a petrochemical wastewater treatment method, which is used for removing manganese and cobalt in petrochemical wastewater and improving the environment on the premise of meeting the water quality requirement; the method comprises the following steps: s1, removing large impurities in the sewage through a grid, and then entering a primary sedimentation tank to remove part of suspended matters in the sewage; s2, allowing water in the primary sedimentation tank to enter a first contact oxidation tank along the bottom; s3, and then entering a second contact oxidation pond along the bottom; s4, then flowing into the hydrolysis acidification pool; s5, flowing water in the hydrolysis acidification tank to the interior of the MBR reactor; s6, the output end of the first water pump is communicated with an ozone catalytic oxidation tank; s7, the water outlet end of the flocculation tank is communicated with an MBFR reactor, and the water outlet pipe is communicated with a second water pump through a hose; s8, an adjusting tank is arranged at the output end of the second water pump; and S9, the water in the regulating reservoir enters a reverse osmosis device to further remove ions in the water.

Description

Petrochemical wastewater treatment method

Technical Field

The invention relates to the technical field of petrochemical wastewater treatment, in particular to a petrochemical wastewater treatment method.

Background

As is well known, the petrochemical industry is the national pillar industry and is one of the heavy pollution industries, and the wastewater discharged in the production process contains a large amount of toxic refractory organic matters, which can cause serious pollution to the received water body and great harm to the water ecological safety and the human health of drinking water if the wastewater cannot be effectively treated. At present, the total amount of industrial wastewater discharged annually in China exceeds 2.1 multiplied by 1010 tons, and most of the industrial wastewater is discharged after being treated by a centralized comprehensive sewage treatment plant. For a large petrochemical industry park, a comprehensive sewage treatment plant is the last barrier for ensuring the standard discharge of petrochemical comprehensive wastewater treatment.

The hydrogen autotrophic denitrification utilizes hydrogen as an electron donor to reduce the oxidizing substances in the water, does not need to add an organic carbon source, does not produce secondary pollution, and is suitable for treating surface water and underground water in a poor nutrition environment. A hydrogen matrix biofilm reactor (MBFR) is a technology with development prospect, based on hydrogen autotrophic denitrification, microporous hollow fiber membrane diffusion (H2) and an autotrophic biofilm technology are organically combined, inorganic carbon is used as a carbon source, H2 is used as an electron donor to react on the surface of a biofilm, and a biological reduction process is completed. The method utilizes H2 to reduce and remove oxidative pollutants (such as CrO42-, AsO43-, NO3-, ClO4-, BrO 3-and the like), and has the advantages of high efficiency, cleanness, NO toxicity, NO secondary pollution, high utilization rate of H2 and the like, and the characteristics which cannot be compared with the traditional biological membrane method.

In the petrochemical industry, the catalyst containing manganese and cobalt is widely applied, so that the wastewater contains manganese and cobalt elements which can cause harm to human bodies and the environment, most of manganese is removed by a contact oxidation method, polyaluminium chloride, an ionic dispersing agent and a surfactant are added, and the aim of removing cobalt is fulfilled by flocculation stirring and aeration.

Disclosure of Invention

In order to solve the technical problems, the invention provides a petrochemical wastewater treatment method which is simple in process, removes manganese and cobalt in petrochemical wastewater on the premise of meeting the water quality requirement, and improves the environment.

The invention discloses a petrochemical wastewater treatment method, which comprises the following steps:

s1, removing large impurities in the sewage through a grid, and then entering a primary sedimentation tank to remove part of suspended matters in the sewage;

s2, feeding water in the primary sedimentation tank into a first contact oxidation tank along the bottom, aerating the bottom in the first contact oxidation tank, adsorbing and removing iron and performing contact oxidation on the water through a filter material at the top in the first contact oxidation tank after aeration and oxygenation, and gradually forming an iron filter membrane with catalytic activity on the surface of the filter material, wherein the iron filter membrane further plays a role in removing iron;

s3, enabling the sewage in the first contact oxidation pond to flow out of the first contact oxidation pond along the top, then enabling the sewage to enter a second contact oxidation pond along the bottom, aerating the bottom in the second contact oxidation pond, filtering the water through a filter layer on the top in the second contact oxidation pond after aeration and oxygenation, and gradually adsorbing hydroxides of high-valence manganese on the surface of the filter layer to form a manganese filter membrane which further plays a role in removing manganese;

s4, enabling the sewage in the water of the second contact oxidation pond to flow out of the second contact oxidation pond along the top and then flow into the hydrolysis acidification pond to remove partial organic matters;

s5, enabling water in the hydrolysis acidification tank to flow into an MBR (membrane bioreactor), wherein the MBR is hermetically and rotatably provided with a first membrane module, the first membrane module has a swing angle of 3-5 degrees and a swing frequency of 2-3 times/MIN, the top of the first membrane module is a water outlet end, and a water outlet pipe is communicated with a first water pump through a hose;

s6, the output end of the first water pump is communicated with an ozone catalytic oxidation tank, ozone is filled at the bottom of the ozone catalytic oxidation tank to remove a small part of organic matters and nitrogen and phosphorus, and then water in the ozone catalytic oxidation tank flows to a flocculation tank;

s7, the water outlet end of the flocculation tank is communicated with an MBFR reactor, the MBFR reactor is hermetically and rotatably provided with a second membrane module, the swing angle of the second membrane module is 1-2 degrees, the swing frequency is 2-3 times/min, the top of the second membrane module is the water outlet end, and the water outlet pipe is communicated with a second water pump through a hose;

s8, an adjusting tank is arranged at the output end of the second water pump;

and S9, the water in the regulating reservoir enters a reverse osmosis device to further remove ions in the water.

In the petrochemical wastewater treatment method, in the step S5, anoxic/aerobic bacteria are arranged in the first membrane module to remove most organic matters, nitrogen and phosphorus.

In the petrochemical wastewater treatment method, in the step S7, the second membrane module is provided with the hydrogen autotrophic denitrifying bacteria to remove the substances with strong oxidizing property in the water.

In the step S7, hydrogen is filled into the second membrane module through the hydrogen cylinder and the hose, and the hydrogen is diffused by bubble-free diffusion after passing through the micropores on the surface of the hollow fiber membrane of the second membrane module.

In the step S8, the temperature of water in the adjusting tank is adjusted to 20-40 ℃, the pH value is adjusted to 7-8, and the top of the adjusting tank is provided with an openable end cover to prevent impurities from entering.

Preferably, the grid in step S1 includes a platform, an annular screen and a water receiving tank, the screen is in a screen shape, the water receiving tank is mounted on the top of the platform, the screen is above the water receiving tank, the bottom of the water receiving tank is communicated with a water outlet pipe, a water inlet pipe is disposed on the left side of the screen, two sets of diagonal rods are fixedly connected to the top of the platform, a driving shaft is rotatably disposed on the two sets of diagonal rods, a first motor is disposed at the left end of the driving shaft, a plurality of connecting rods connected to the left end and the inner right end of the screen are fixedly connected to the driving shaft, a left hydraulic cylinder and a right hydraulic cylinder are fixedly connected to the top of the platform, a left bracket and a right bracket are respectively fixedly connected to the top ends of the left hydraulic cylinder and the right hydraulic cylinder, a left rotating shaft is rotatably disposed on the left bracket, a right rotating shaft is rotatably disposed on the right bracket, the upper chain is fixedly connected with a plurality of mounting plates, the other side of each mounting plate is provided with a brushing group, the top of the platform is provided with a collecting mechanism, the collecting mechanism is positioned on the right side of the screen, the collecting mechanism comprises a threaded rod, two sets of limiting rods, two sets of fixing plates, a front collecting box and a rear collecting box, the two sets of fixing plates are connected with the platform, the threaded rod is rotatably connected with the two sets of fixing plates, the front end of the threaded rod is provided with a third motor, the threaded rod is connected with a driving block in a threaded mode, the two sets of limiting rods all penetrate through the driving block, each set of limiting rods are connected with the two sets of fixing plates respectively, the top end of the driving block is provided with.

More preferably, the inner wall of the front collecting box is provided with two groups of front material level switches with equal heights, the two groups of front material level switches are electrically connected with a third motor, the third motor is electrically connected with a front contact switch, the inner wall of the rear collecting box is provided with two groups of rear material level switches with equal heights, the two groups of rear material level switches are electrically connected with the third motor, and the third motor is electrically connected with a rear contact switch.

More preferably, base plate top front end fixedly connected with preceding stabilizer bar, preceding stabilizer bar top hub connection has preceding fixed block, preceding fixed block is connected with preceding collecting box bottom front end, base plate top fixedly connected with and the preceding montant of preceding collecting box bottom rear end contact, preceding collecting box rear end is provided with the front handle, base plate top rear end fixedly connected with back connecting rod, back connecting rod top hub connection has the after-fixing piece, the after-fixing piece is connected with back collecting box bottom rear end, base plate top fixedly connected with and the back montant of back collecting box bottom front end contact, the back collecting box front end is provided with the back handle.

More preferably, the two groups of diagonal rods are provided with supporting rods, the two groups of diagonal rods are provided with cleaning shafts in a rotatable mode, the cleaning shafts are provided with rubber belts in contact with the outer wall of the screen, the width of each rubber belt is 3-5cm, the length of each rubber belt is larger than the distance between each cleaning shaft and the top end of the screen, the right ends of the cleaning shafts and the right ends of the driving shafts are provided with middle chain wheels, and the middle chain wheels are sleeved with upper chains.

More preferably, the bottom in the water receiving tank is the back taper.

More preferably, the four corners of the bottom of the driving block can be rotatably provided with rollers.

More preferably, each set of the diagonal rods is provided with a reinforcing frame connected with the platform.

Compared with the prior art, the invention has the beneficial effects that: according to the scheme, firstly, a contact oxidation method is used for removing most of iron elements in water, so that a large amount of floccules generated in subsequent processes are prevented from influencing the operation of equipment, then, a contact oxidation method is used for removing most of manganese elements in water, the influence on the subsequent processes is reduced, then, the water enters a hydrolysis acidification tank to remove part of organic matters, the treated water enters an MBR, a first membrane module in the MBR swings when running normally, and the blockage caused by excessive impurities accumulated on the surface of the first membrane module is prevented; meanwhile, most organic matters and nitrogen and phosphorus are removed by anoxic/aerobic bacteria arranged on the first membrane component, then the residual organic matters and nitrogen and phosphorus are continuously removed by water through ozone catalytic oxidation, and then the water is flocculated to remove impurities and reduce the influence on the MBFR reactor; after water enters the MBFR reactor, the hydrogen and hydrogen autotrophic denitrifying bacteria reduce strongly oxidized substances (such as ozone, chlorine and the like) in the water, the second membrane component removes particulate matters, the second membrane component can swing to prevent the membranes from being blocked so as to reduce the load of reverse osmosis, and finally, the water is purified through reverse osmosis to remove manganese and cobalt in the water, so that the emission standard is reached.

Drawings

FIG. 1 is a schematic structural view of the present invention;

FIG. 2 is an enlarged view of a portion A of FIG. 1;

FIG. 3 is a partial enlarged view of portion B of FIG. 1;

FIG. 4 is a schematic view of the construction of the grid of the present invention;

FIG. 5 is a right side view of the platform and collection mechanism in connection;

FIG. 6 is a partial enlarged view of portion C of FIG. 4;

FIG. 7 is a schematic top view of the connection of the threaded rod, the stop rod and the fixing plate;

in the drawings, the reference numbers: 31. a grid; 32. a primary sedimentation tank; 33. a first contact oxidation pond; 34. a second contact oxidation pond; 35. a hydrolysis acidification pool; 36. an MBR reactor; 37. a first membrane module; 38. a water outlet end; 39. a first water pump; 310. an ozone catalytic oxidation tank; 311. a flocculation tank; 312. an MBFR reactor; 313. a second membrane module; 314. a second water pump; 315. a regulating tank; 316. a reverse osmosis unit; 317. an end cap;

1. a platform; 2. screening a screen; 3. a water receiving tank; 4. a water outlet pipe; 5. a water inlet pipe; 6. a diagonal bar; 7. a drive shaft; 8. a first motor; 9. a connecting rod; 10. a right hydraulic cylinder; 11. a right bracket; 12. a right rotating shaft; 13. a right sprocket; 14. a second motor; 15. a lower chain; 16. mounting a plate; 17. brushing; 18. a collection mechanism; 1801. a threaded rod; 1802. a limiting rod; 1803. a fixing plate; 1804. a front collection box; 1805. a third motor; 1806. a drive block; 1807. a substrate; 1808. a front material level switch; 1809. a front contact switch; 1810. a front stabilizer bar; 1811. a front fixed block; 1812. a front vertical bar; 1813. a front handle; 1814. a roller; 19. a support bar; 20. cleaning the shaft; 21. a rubber belt; 22. chain feeding; 24. a reinforcing frame.

Detailed Description

The following detailed description of embodiments of the present invention is provided in connection with the accompanying drawings and examples. The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention.

The reverse osmosis membrane has the characteristic of selectively intercepting ionic substances by passing water, and when the pressure of the saline side of the membrane is higher than the osmotic pressure, the water in the saline flows to the pure water side, so that the saline-water separation in the solution is realized;

in a large petrochemical plant, the water quality is as shown in the following table:

COD

BOD

SS

total nitrogen

Total phosphorus

Manganese oxide

Cobalt

850mg/L

400mg/L

550mg/L

60mg/L

20mg/L

300ug/L

200ug/L

As shown in fig. 4 to 7, the grid of the present invention comprises a platform 1, a ring-shaped screen 2 and a water receiving tank 3, wherein the screen 2 is in a screen shape, the water receiving tank 3 is installed on the top of the platform 1, the screen 2 is located above the water receiving tank 3, the bottom end of the water receiving tank 3 is communicated with a water outlet pipe 4, the left side of the screen 2 is provided with a water inlet pipe 5, the top of the platform 1 is fixedly connected with two groups of diagonal rods 6, the two groups of diagonal rods 6 are rotatably provided with a driving shaft 7, the left end of the driving shaft 7 is provided with a first motor 8, the driving shaft 7 is fixedly connected with a plurality of connecting rods 9 connected with the left end and the inner right end of the screen 2, the top of the platform 1 is fixedly connected with a left hydraulic cylinder and a right hydraulic cylinder 10, the top ends of the left hydraulic cylinder and the right hydraulic cylinder 10 are respectively fixedly connected with a, the two ends of the right rotating shaft 12 are respectively provided with a right chain wheel 13 and a second motor 14, the left chain wheel and the right chain wheel 13 are sleeved with a lower chain 15, the lower chain 15 is fixedly connected with a plurality of mounting plates 16, the other side of the mounting plates 16 is provided with a brush hair group 17, the top of the platform 1 is provided with a collecting mechanism 18, the collecting mechanism 18 is positioned at the right side of the screen 2, the collecting mechanism 18 comprises a threaded rod 1801, two groups of limiting rods 1802, two groups of fixing plates 1803, a front collecting box 1804 and a rear collecting box, the two groups of fixing plates 1803 are connected with the platform 1, the threaded rod 1801 is rotatably connected with the two groups of fixing plates 1803, the front end of the threaded rod 1801 is provided with a third motor 1805, the threaded rod 1801 is threadedly connected with a driving block 1806, the two groups of limiting rods 1802 pass through the driving block 1806, the two ends of each group of limiting rods 1802 are respectively, the front collecting box 1804 and the rear collecting box are both hollow, and the tops of the front collecting box and the rear collecting box are provided with taking and placing openings; under the coordination of two groups of inclined rods 6, a plurality of groups of connecting rods 9, a driving shaft 7 and the like, a first motor 8 drives a screen 2 to rotate, under the coordination of a left support, a right support 11, a left rotating shaft, a right rotating shaft 12, a left chain wheel, a right chain wheel 13 and a lower chain 15, a second motor 14 rotates to drive a bristle group 17 to rotate along the lower chain 15, and controls the distance between the bristle group 17 and the bottom in the screen 2 through a left hydraulic cylinder and a right hydraulic cylinder 10, so that the bristle group 17 can still be contacted with the screen 2 when worn, a threaded rod 1801 is rotatably connected with two groups of fixing plates 1803, the threaded rod 1801 is in threaded connection with a driving block 1806, the driving block 1806 cannot rotate under the action of two groups of limiting rods 1802, therefore, the third motor 1805 enables the driving block 1806, a base plate 1807, a front collecting box, a rear collecting box and the like to displace 1804 in the front and rear directions, and when in normal use, the first motor, make sewage along inlet tube 5 spout to screen cloth 2 inside, because screen cloth 2 is the sieve form to screen cloth 2 intercepts the impurity granule in the sewage, and under the effect of brush hair group 17, the impurity granule flows to before collecting box 1804 or back collecting box inside, regularly to before collecting box 1804 or back collecting box clear up can, thereby screen cloth 2 can carry out online clearance.

The inner wall of the front collecting box 1804 is provided with two groups of front material level switches 1808 with equal height, the two groups of front material level switches 1808 are electrically connected with a third motor 1805, the third motor 1805 is electrically connected with a front contact switch 1809, the inner wall of the rear collecting box is provided with two groups of rear material level switches with equal height, the two groups of rear material level switches are electrically connected with the third motor 1805, and the third motor 1805 is electrically connected with a rear contact switch; as shown in fig. 2, after the front collection box 1804 is fully collected, touch two sets of front material level switches 1808, two sets of front material level switches 1808 control the third motor 1805 to open and make the front collection box 1804 etc. move forward, when the driving block 1806 contacts with the front contact switch 1809, the third motor 1805 stops, the rear collection box is under the right end of the screen 2 at this moment, then the front collection box 1804 that slopes forward pours out impurities can, after the rear collection box is fully collected, touch two sets of rear material level switches, two sets of rear material level switches control the third motor 1805 to open and make the front collection box 1804 etc. move backward, when the driving block 1806 contacts with the rear contact switch, at this moment, the front collection box 1804 is under the right end of the screen 2, then the rear collection box that slopes backward pours out impurities can.

The front end of the top of the substrate 1807 is fixedly connected with a front stabilizer bar 1810, the top end of the front stabilizer bar 1810 is connected with a front fixing block 1811 through a shaft, the front fixing block 1811 is connected with the front end of the bottom of the front collecting box 1804, the top of the substrate 1807 is fixedly connected with a front vertical rod 1812 which is in contact with the rear end of the bottom of the front collecting box 1804, the rear end of the front collecting box 1804 is provided with a front handle 1813, the rear end of the top of the substrate 1807 is fixedly connected with a rear connecting rod, the top end of the rear connecting rod is connected with a rear fixing block through a shaft, the rear fixing block is connected with the rear end of the bottom of the rear; under the cooperation of the front stabilizer bar 1810 and the front fixing block 1811 and the like, the front handle 1813 is held and rotated to rotate the front collecting box 1804, when the front collecting box 1804 is collected, the front vertical rod 1812 supports the front collecting box 1804 to be in a horizontal state, and under the cooperation of the rear connecting rod and the rear fixing block and the like, the rear handle is held and rotated to rotate the rear collecting box, when the rear collecting box is collected, the rear vertical rod supports the rear collecting box to be in a horizontal state.

The two groups of inclined rods 6 are respectively provided with a support rod 19, the two groups of support rods 19 are rotatably provided with a cleaning shaft 20, the cleaning shaft 20 is provided with a rubber belt 21 which is in contact with the outer wall of the screen 2, the width of the rubber belt 21 is 3-5cm, the length of the rubber belt 21 is greater than the distance between the cleaning shaft 20 and the top end of the screen 2, the right end of the cleaning shaft 20 and the right end of the driving shaft 7 are respectively provided with a middle chain wheel, and the two groups of middle chain wheels are sleeved with an upper chain 22; under the cooperation of two sets of bracing pieces 19, clearance axle 20, two sets of well sprockets and last chain 22, first motor 8 drive screen cloth 2 and a plurality of rubber tape 21 rotate, and a plurality of rubber tape 21 are beaten screen cloth 2, produce the vibration, prevent that screen cloth 2 from blockking up.

The bottom end in the water receiving tank 3 is in an inverted cone shape; the water receiving tank 3 is convenient to collect sewage and then flow out along the water outlet pipe 4. Four corners of the bottom of the driving block 1806 are respectively provided with a roller 1814 in a rotating way; the roller 1814 rotatably supports the driving block 1806, so as to improve the stability of the driving block 1806. Each group of the inclined rods 6 is provided with a reinforcing frame 24 connected with the platform 1; the reinforcing frame 24 improves the reliability of the connection between the diagonal member 6 and the platform 1.

When the grating device works, under the coordination of two groups of inclined rods 6, a plurality of groups of connecting rods 9, a driving shaft 7 and the like, a first motor 8 drives a screen 2 to rotate, under the coordination of a left support, a right support 11, a left rotating shaft, a right rotating shaft 12, a left chain wheel, a right chain wheel 13 and a lower chain 15, a second motor 14 rotates to drive a bristle group 17 to rotate along the lower chain 15, the distance between the bristle group 17 and the inner bottom of the screen 2 is controlled through a left hydraulic cylinder and a right hydraulic cylinder 10, so that the bristle group 17 can still be contacted with the screen 2 when worn, a threaded rod 1801 is rotatably connected with two groups of fixing plates 1803, the threaded rod 1801 is in threaded connection with a driving block 1806, the driving block 1806 cannot rotate under the action of two groups of limiting rods 1802, therefore, the third motor 1805 enables the driving block 1806, a base plate 1807, a front collecting box 1804, a rear collecting box and the like to displace forwards and backwards, and when the grating device is normally used, the sewage is sprayed into the screen 2 along the water inlet pipe 5, the screen 2 is in a screen shape, the screen 2 intercepts impurity particles in the sewage, the water receiving tank 3 collects the sewage and then flows out along the water outlet pipe 4, under the matching of the two groups of support rods 19, the cleaning shaft 20, the two groups of middle chain wheels and the upper chain 22, the first motor 8 drives the screen 2 and the plurality of rubber belts 21 to rotate, the plurality of rubber belts 21 hit the screen 2 to generate vibration to prevent the screen 2 from being blocked, the impurity particles flow into the front collecting box 1804 or the rear collecting box under the action of the brush hair group 17, the front collecting box 1804 is fully collected and then touches the two groups of front material level switches 1808, the two groups of front material level switches 1808 control the third motor 1805 to open to enable the front collecting box 1804 and the like to move forwards, when the driving block 1806 is in contact with the front contact switch 1809, the third motor 1805 stops, and the rear collecting box is positioned right below the right end of, then hold preceding handle 1813 and incline forward before collecting box 1804 and pour out impurity can, after the back collecting box collects the back, touch two sets of back material level switches, two sets of back material level switches control third motor 1805 and open and make preceding collecting box 1804 etc. move backward, when driver block 1806 and back contact switch contact, preceding collecting box 1804 is under the screen cloth 2 right-hand member this moment, then hold the back handle and incline backward the back collecting box pour out impurity can to screen cloth 2 can carry out online clearance.

Example (b):

as shown in fig. 1-3:

s1, removing large impurities in the sewage through the grid 31, and then entering a primary sedimentation tank 32 to remove part of suspended matters in the sewage;

s2, feeding water in the primary sedimentation tank into the first contact oxidation tank 33 along the bottom, aerating the bottom in the first contact oxidation tank 33, carrying out aeration and oxygenation on the water, then adsorbing and removing iron and carrying out contact oxidation on the water through a filter material at the top in the first contact oxidation tank 33, and gradually forming an iron filter membrane with catalytic activity on the surface of the filter material, wherein the iron filter membrane further plays a role in removing iron;

s3, enabling sewage in the first contact oxidation pond 33 to flow out of the first contact oxidation pond 33 along the top, then enabling the sewage to enter the second contact oxidation pond 34 along the bottom, aerating the bottom in the second contact oxidation pond 34, filtering the water through a filter layer at the top in the second contact oxidation pond 34 after aeration and oxygenation, enabling hydroxide of high-valence manganese to be gradually adsorbed on the surface of the filter layer to form a manganese filter membrane, and further playing a role in removing manganese;

s4, enabling the sewage in the second contact oxidation pond 34 to flow out of the second contact oxidation pond 34 along the top and then flow into the hydrolysis acidification pond 35 to remove partial organic matters;

s5, enabling water in the hydrolysis acidification tank 35 to flow into an MBR (biofilm reactor) 36, wherein the MBR 36 is hermetically and rotatably provided with a first membrane module 37, the first membrane module 37 swings at an angle of 3-5 degrees and a frequency of 2-3 times/MIN, anoxic/aerobic bacteria are arranged in the first membrane module 37 to remove most organic matters and nitrogen and phosphorus, the top of the first membrane module 37 is a water outlet end, and the water outlet pipe is communicated with a first water pump 39 through a hose;

s6, the output end of the first water pump 39 is communicated with an ozone catalytic oxidation tank 310, ozone is filled at the bottom in the ozone catalytic oxidation tank 310 to remove a small part of organic matters and nitrogen and phosphorus, and then the water in the ozone catalytic oxidation tank flows to a flocculation tank 311;

s7, the water outlet end of the flocculation tank 311 is communicated with an MBFR reactor (membrane aeration biofilm reactor) 312, the MBFR reactor 312 is hermetically and rotatably provided with a second membrane component 313, the swing angle of the second membrane component 313 is 1-2 degrees, the swing frequency is 2-3 times/min, the second membrane component is provided with hydrogen autotrophic denitrifying bacteria to remove substances with strong oxidizing property in water, hydrogen is filled into the second membrane component 313 through a hydrogen bottle and a hose, the hydrogen is diffused in a bubble-free diffusion mode after passing through micropores on the surface of a hollow fiber membrane on the second membrane component 313, the top of the second membrane component 313 is the water outlet end, and the water outlet pipe is communicated with a second water pump 314 through a hose;

s8, an adjusting tank 315 is arranged at the output end of the second water pump 314, the temperature of water in the adjusting tank 315 is adjusted to 20-40 ℃, the pH value is adjusted to 7-8, and an end cover 317 which can be opened and closed is arranged at the top of the adjusting tank 315 to prevent impurities from entering;

s9, the water in the regulating reservoir 315 enters a reverse osmosis 316 device to further remove ions in the water.

Comparative example:

the sewage sequentially passes through a primary sedimentation tank, a first contact oxidation tank for removing iron, a second contact oxidation tank for removing manganese, a hydrolysis acidification tank, an anoxic/aerobic tank, a secondary sedimentation tank, a micro flocculation sand filter tank, an ozone catalytic oxidation tank and a backwashing water tank.

After the treatment of the embodiment and the comparative example, the effluent quality of the large petrochemical plant is as follows:

according to the data, most of manganese, cobalt and other ions in the water can be removed under the condition of ensuring the water quality by using the method, so that the environment is improved.

The installation mode, the connection mode or the arrangement mode of all the components are welding, riveting or other common mechanical modes, wherein the sliding/rotating fixation is that the components do not fall off under the sliding/rotating state, the sealing communication is that the two connecting pieces are communicated and simultaneously sealed, the specific structures, the models and the coefficient indexes of all the components are self-contained technologies, the beneficial effects can be realized, all the electric modules and the electric appliances are common electric appliances in the market, the electric modules and the electric appliances can be used only by being mutually and electrically connected according to the use instructions bought back together when bought for use, and the control module is the common self-contained module, so the details are not repeated.

In the petrochemical wastewater treatment method of the present invention, unless otherwise specified, the terms "up, down, left, right, front, rear, inner, rear, and vertical, horizontal" and the like are included in the terms only to indicate the orientation of the terms in the normal use state, or be a trivial term understood by those skilled in the art, and should not be considered as limiting the term, at the same time, the numerical terms "first," "second," and "third," etc. do not denote any particular quantity or order, but rather are used to distinguish one from another, furthermore, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements, but also includes other elements not expressly listed or inherent to such process, method, article, or apparatus.

The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, several modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the protection scope of the present invention.

Claims

1. A petrochemical wastewater treatment method is characterized by comprising the following steps:

s8, an adjusting tank is arranged at the output end of the second water pump;

2. The petrochemical wastewater treatment method according to claim 1, wherein the first membrane module is provided with anoxic/aerobic bacteria inside to remove most of organic matters and nitrogen and phosphorus in step S5.

3. The petrochemical wastewater treatment method according to claim 2, wherein the second membrane module is provided with hydrogen autotrophic denitrifying bacteria to remove strongly oxidizing substances in the water in step S7.

4. The method for treating petrochemical wastewater according to claim 3, wherein the second membrane module is filled with hydrogen gas through a hydrogen cylinder and a hose, and the hydrogen gas is diffused without bubbles after passing through the micro-pores on the surface of the hollow fiber membrane of the second membrane module.

5. The petrochemical wastewater treatment method according to claim 4, wherein the temperature of water in the adjustment tank is adjusted to 20-40 ℃ and the pH is adjusted to 7-8 in step S8, and an openable and closable end cap is provided at the top of the adjustment tank to prevent the entry of impurities.

6. The petrochemical wastewater treatment method according to any one of claims 1-5, wherein the grid in step S1 comprises a platform (1), a ring-shaped screen (2) and a water receiving tank (3), the surface of the screen (2) is in a screen shape, the water receiving tank (3) is installed on the top of the platform (1), the screen (2) is above the water receiving tank (3), the bottom of the water receiving tank (3) is communicated with a water outlet pipe (4), the left side of the screen (2) is provided with a water inlet pipe (5), the top of the platform (1) is fixedly connected with two groups of diagonal rods (6), the two groups of diagonal rods (6) are rotatably provided with a driving shaft (7), the left end of the driving shaft (7) is provided with a first motor (8), the driving shaft (7) is fixedly connected with a plurality of connecting rods (9) connected with the left end and the right end in the screen (2), the top of the platform (1) is fixedly connected with, the top ends of the left hydraulic cylinder and the right hydraulic cylinder (10) are respectively and fixedly connected with a left support and a right support (11), a left rotating shaft is rotatably arranged on the left support, a right rotating shaft (12) is rotatably arranged on the right support (11), a left chain wheel is arranged at the front end of the left rotating shaft, a right chain wheel (13) and a second motor (14) are respectively arranged at two ends of the right rotating shaft (12), a lower chain (15) is sleeved on the left chain wheel and the right chain wheel (13), a plurality of mounting plates (16) are fixedly connected to the lower chain (15), a brush hair group (17) is arranged at the other side of each mounting plate (16), a collecting mechanism (18) is arranged at the top of the platform (1), and the collecting mechanism (; collect mechanism (18) including threaded rod (1801), two sets of gag lever post (1802), two sets of fixed plate (1803), preceding collecting box (1804) and back collecting box, two sets of fixed plate (1803) are connected with platform (1), threaded rod (1801) and two sets of fixed plate (1803) rotatable coupling, threaded rod (1801) front end is provided with third motor (1805), threaded rod (1801) goes up threaded connection has drive block (1806), drive block (1806) are all passed in two sets of gag lever posts (1802), every group gag lever post (1802) both ends are connected with two sets of fixed plate (1803) respectively, drive block (1806) top is provided with base plate (1807), preceding collecting box (1804) and back collecting box all with base plate (1807) rotatable coupling, preceding collecting box (1804) and the inside all cavity of back collecting box and the top are equipped with and get and put the mouth.

7. The petrochemical wastewater treatment method according to claim 6, wherein two sets of front level switches (1808) with equal height are arranged on the inner wall of the front collection box (1804), the two sets of front level switches (1808) are electrically connected with the third motor (1805), the third motor (1805) is electrically connected with the front contact switch (1809), the inner wall of the rear collection box is provided with two sets of rear level switches with equal height, the two sets of rear level switches are electrically connected with the third motor (1805), and the third motor (1805) is electrically connected with the rear contact switch.

8. The petrochemical wastewater treatment method according to claim 7, wherein a front stabilizer bar (1810) is fixedly connected to the front end of the top of the substrate (1807), a front fixing block (1811) is pivotally connected to the top of the front stabilizer bar (1810), the front fixing block (1811) is connected to the front end of the bottom of the front collection box (1804), a front vertical bar (1812) is fixedly connected to the top of the substrate (1807) and contacts with the rear end of the bottom of the front collection box (1804), a front handle (1813) is arranged at the rear end of the front collection box (1804), a rear connecting rod is fixedly connected to the rear end of the top of the substrate (1807), a rear fixing block is pivotally connected to the top of the rear connecting rod, the rear fixing block is connected to the rear end of the bottom of the rear collection box, a rear vertical bar is fixedly connected to the top of the substrate (1807.

9. The petrochemical wastewater treatment method according to claim 8, wherein two groups of the inclined bars (6) are respectively provided with a support bar (19), two groups of the support bars (19) are respectively rotatably provided with a cleaning shaft (20), the cleaning shaft (20) is provided with a rubber belt (21) which is in contact with the outer wall of the screen (2), the width of the rubber belt (21) is 3-5cm, the length of the rubber belt (21) is greater than the distance between the cleaning shaft (20) and the top end of the screen (2), the right end of the cleaning shaft (20) and the right end of the driving shaft (7) are respectively provided with a middle chain wheel, and two groups of the middle chain wheels are sleeved with a chain (22).

10. The petrochemical wastewater treatment method according to claim 9, wherein the rollers (1814) are rotatably disposed at four corners of the bottom of the driving block (1806).