CN113735383A

CN113735383A - Multifunctional integrated sewage treatment system and method

Info

Publication number: CN113735383A
Application number: CN202111120217.2A
Authority: CN
Inventors: 王胜男; 王光存; 蹤雪梅
Original assignee: Jiangsu Xugong Construction Machinery Research Institute Co ltd
Current assignee: Jiangsu Xugong Construction Machinery Research Institute Co ltd
Priority date: 2021-09-24
Filing date: 2021-09-24
Publication date: 2021-12-03

Abstract

The invention discloses a multifunctional integrated industrial sewage treatment system and method. The multifunctional integrated industrial sewage treatment system comprises an upper and lower two-layer box body, and the lower layer box body is sequentially provided with a centralized storage tank, an acid water tank, an alkaline water tank and a pre-biochemical treatment pond, aerobic pond and secondary sedimentation pond, and the upper box is provided with a primary flocculation pond, a COD filter pond, a secondary flocculation pond and an anaerobic pond. The invention is mainly used to treat the sewage produced by the paint and oil rust cleaning on the surface of the hydraulic valve body. It is integrated with the AO section through two settling filtration and three-layer filter material filtration, and can efficiently treat the high content of COD and BOD, ammonia nitrogen and anionic surfactant content. larger sewage. The equipment has high integration, complete functions, small footprint, and is less affected by temperature. It can be operated in the workshop, and can meet the sewage treatment requirements of COD10000 and ammonia nitrogen 1000, and the cost is low.

Description

Multifunctional integrated sewage treatment system and method

Technical Field

The invention relates to a multifunctional integrated sewage treatment system and method, and belongs to the technical field of sewage treatment.

Background

Industrial sewage is waste water and waste liquid produced in the industrial production process, and if the sewage is discharged without proper treatment, water body pollutants exceed the standard, so that not only is the ecological environment influenced, but also the life safety of surrounding residents is threatened, and even the comprehensive development of a region is influenced. In the field of remanufacture cleaning, when the hydraulic valve body is subjected to paint oil stain rust cleaning, the COD and ammonia nitrogen content in the generated wastewater is high under the influence of chemical components in a cleaning formula, and the treatment difficulty is far higher than that of general industrial wastewater, so that the method belongs to an industrial problem. The existing industrial sewage treatment equipment has the defects of large equipment volume, single treatment function, large influence of temperature and the like. Therefore, aiming at the industrial sewage with high nitrogen and high COD, the research and development of a treatment system with high integration level, small floor area and complete functions is urgent.

Through literature research, the treatment technologies for removing nitrogen and COD in industrial sewage at present are mainly divided into 3 types, including physical adsorption method, chemical coagulation sedimentation method and biological treatment method.

Physical adsorption method: can treat pollutants in various waste water, and has strong adaptability, good treatment effect and excellent effluent quality. But the difficulty of activated carbon regeneration is high, the operating cost of the activated carbon adsorption device is high, the operation is complex, and the requirement on operators is high. Chemical coagulating sedimentation method: low cost of equipment, good chemical treatment effect and simple operation and treatment. But chemical agents are required to be continuously added into the wastewater, and a post-filtration process is required to remove particles in the wastewater after coagulating sedimentation, so that the treatment cost is high.

Biological treatment method: the common method for removing COD and ammonia nitrogen has high efficiency of removing dissolved or colloidal organic matters and good settling property of sludge. However, the requirement on the quality of raw water is high, and if the salt content of the wastewater is high, the wastewater is not beneficial to the growth of microorganisms, so that the removal rate of COD and ammonia nitrogen is not high. And the adaptability of the environmental temperature is poor, and the action effect of the biological strains is easily influenced by the environmental temperature.

Disclosure of Invention

The invention aims to overcome the defects of the prior art and provide multifunctional integrated industrial sewage treatment equipment and a set of sewage treatment process suitable for high ammonia nitrogen and high COD treatment. The device is mainly used for treating sewage generated by rust cleaning of oil stain on the surface of the hydraulic valve body, and efficiently treating sewage with high COD (chemical oxygen demand) and BOD (biochemical oxygen demand) contents and high ammonia nitrogen and anionic surfactant contents by integrating twice sedimentation filtration, three-layer filter material filtration and AO (anaerobic-anoxic-oxic) working section. The equipment integration level is high, multiple functional, area is little, and it is little influenced by the temperature, can move in the workshop, and the highest COD10000 that satisfies, ammonia nitrogen 1000's sewage treatment demand, the cost is lower.

In order to solve the technical problem, the invention provides a multifunctional integrated industrial sewage treatment system which comprises an upper layer box body and a lower layer box body, wherein the lower layer box body is sequentially provided with a centralized storage pool, an acidic water tank, a basic water tank, a pre-biochemical treatment pool, an aerobic pool and a secondary sedimentation pool;

the centralized storage pool is connected with a primary flocculation pool through a lifting device, one side of the primary flocculation pool is connected with an acid water tank through the lifting device, the other side of the primary flocculation pool is connected with an anaerobic pool through a backflow pipe, the acid water tank is connected with a COD (chemical oxygen demand) filter pool through the lifting device, the COD filter pool is connected with a basic water tank through the lifting device, the basic water tank is connected with a secondary flocculation pool through the lifting device, one side of the secondary flocculation pool is connected with the anaerobic pool through the backflow pipe, the other side of the secondary flocculation pool is connected with a biochemical pretreatment pool through the lifting device, the biochemical pretreatment pool is connected with the anaerobic pool through the lifting device, the anaerobic pool is connected with an aerobic pool through the lifting device, and the aerobic pool is connected with a secondary sedimentation pool through the lifting device; and an aeration device or an air blast device is respectively arranged in the primary flocculation tank, the COD filtering tank, the secondary flocculation tank, the biochemical pretreatment tank and the aerobic tank.

Preferably, two water inlets are arranged in the centralized treatment tank, and the alkaline waste liquid after paint removal and the acidic waste liquid after rust removal are respectively introduced into the tank; be equipped with the agitator in the centralized processing pond, be equipped with first PAC doser and first PAM doser on the centralized processing pond.

Preferably, the aeration device comprises a micro aeration pipe, an aeration pipeline, a bubble generator and an aeration valve, wherein the micro aeration pipe is connected with the bubble generator through the aeration pipeline, and the aeration pipeline is provided with the aeration valve.

Preferably, an acid solution feeder is arranged on the acid water tank, and acid solution is fed into the acid water tank through the acid solution feeder to adjust the pH value of waste liquid in the acid water tank to 3-4.

Preferably, the COD filtering ponds are arranged on the upper layer of the alkaline water tank, a three-level filtering system is arranged in the COD filtering ponds and comprises an upper-layer stone filtering layer, a middle-layer activated carbon filtering layer and a lower-layer gauze cushion layer, and the waste liquid flows from the top layer to the bottom layer.

Preferably, an alkaline solution feeder is arranged on the alkaline water tank, alkaline solution is fed into the alkaline water tank through the alkaline solution feeder, and the pH value of waste liquid in the alkaline water tank is adjusted to 8.

Preferably, a second PAC doser and a second PAM doser are arranged on the secondary flocculation tank.

Preferably, be equipped with the anaerobism fungus in the anaerobism pond, be equipped with the aerobic bacteria in the aerobic pond, all be equipped with the heating wire in anaerobism pond and the aerobic pond, anaerobism pond and aerobic pond all are equipped with controller and temperature sensor outward for the temperature in anaerobism pond and the aerobic pond is adjusted in the monitoring.

Preferably, a water quality detector is arranged on one side of the secondary sedimentation tank.

Preferably, the lifting device comprises a water pump and a water pipe, and two ends of the water pump are connected with the water pipe.

The invention provides a multifunctional integrated industrial sewage treatment method based on the system, which comprises the following steps:

leading the generated industrial sewage into a centralized storage pool for centralized storage;

adding a flocculating agent into the centralized storage tank and uniformly stirring;

introducing industrial sewage into a primary flocculation tank, aerating by an aeration device, introducing the sludge after reaction into an anaerobic tank, and introducing clear liquid into an acidic water tank;

adding an acidic solution into an acidic water tank, and transferring the industrial sewage to a COD (chemical oxygen demand) filter tank by using a lifting device;

filtering by a COD filtering tank, aerating the bottom by an aeration device, and transferring the industrial sewage into an alkaline water tank by a lifting device;

adding an alkaline solution into the alkaline water tank, and transferring the industrial sewage into a secondary flocculation tank through a lifting device;

adding a flocculating agent into the secondary flocculation tank, aerating by an aeration device, performing flocculation reaction, introducing the sludge after the reaction into an anaerobic tank, and introducing clear liquid into a pre-biochemical treatment tank;

introducing industrial sewage into a pre-biochemical treatment tank, adding a pre-biochemical treatment agent, and starting an aeration device;

then introducing the industrial sewage into an anaerobic tank, adding anaerobic bacteria, closing a lifting device and an aeration device, and performing full-silent treatment;

introducing industrial sewage into an aerobic tank, adding aerobic bacteria, and starting an aeration device;

and introducing the treated liquid into a secondary sedimentation tank for mud-water separation, conveying the settled sludge by a sludge conveying vehicle, and discharging the clear liquid after the clear liquid reaches the standard through detection.

Preferably, if the weather is cold, the water is heated by the heating wires in the anaerobic tank and the aerobic tank, and the temperature is controlled to be 15-35 ℃.

Preferably, the COD filtering tank is used for filtering treatment for half an hour, the biochemical treatment tank is used for reaction for 24 hours, the anaerobic tank is used for full-silent treatment for 3-4 days, and the aerobic tank is used for treatment for 1-2 days.

The invention achieves the following beneficial effects:

(1) the multifunctional integrated industrial sewage treatment equipment adopts an upper layer and a lower layer to be arranged, and the whole system is arranged on a whole skid block, so that the multifunctional integrated industrial sewage treatment equipment has the advantages of high integration level and small occupied area.

(2) This equipment relies on hoisting device to realize that the waste liquid transports between upper and lower water tank, and the device is simple, and the cost is lower.

(3) The aeration devices are arranged outside the primary flocculation tank, the secondary flocculation tank, the COD filtering tank, the pre-biochemical reaction tank and the aerobic tank of the equipment, compressed air is oxygenated, the reaction contact area is increased, and the reaction rate is increased.

(4) The COD filtering ponds contain tertiary filtration system, including upper strata stone filtration, middle level active carbon filtration and lower floor's gauze bed course, realize that the waste liquid fully filters, and this link COD clearance is high.

(5) The anaerobic pool and the aerobic pool of the device are provided with temperature control devices, which comprise heating wires, controllers and temperature sensors. The biological strains are ensured to keep higher activity in low-temperature weather, and higher biochemical treatment efficiency is achieved.

The industrial wastewater with high COD and high ammonia nitrogen has high organic matter concentration, more difficultly-degraded substances, complex components and higher treatment difficulty. The sewage treatment system can realize the integrated treatment of COD and ammonia nitrogen in industrial wastewater, the treatment capacity of the COD reaches 97 percent, and the treatment capacity of the ammonia nitrogen reaches 96 percent. The wastewater treatment process is simple, the cost is lower, the treatment effect is good, the occupied area of equipment is small, and the engineering application value is great.

Drawings

FIG. 1 is a schematic view of a multifunctional integrated industrial wastewater treatment system of the present invention;

FIG. 2 is a flow chart of the multifunctional integrated industrial wastewater treatment method of the present invention.

The meaning of the main reference symbols in the figures is:

1-concentrated storage pool, 2-primary flocculation tank, 3-acidic water tank, 4-COD filtering tank, 5-alkaline water tank, 6-secondary flocculation tank, 7-biochemical pretreatment tank, 8-anaerobic tank, 9-aerobic tank, 10-secondary sedimentation tank, 11-stirrer, 12-first PAC doser, 13-first PAM doser, 14-water pump, 15-water pipe, 16-micro aeration pipe, 17-aeration pipeline, 18-bubble generator, 19-aeration valve, 20-reflux pipe, 21-acidic solution doser, 22-alkaline solution doser, 23-second PAC doser, 24-second PAM doser, 25-electric heating wire, 26-controller, 27-temperature sensor, 28-water quality monitor and other devices.

Detailed Description

The invention is further described below with reference to the accompanying drawings. The following examples are only for illustrating the technical solutions of the present invention more clearly, and the protection scope of the present invention is not limited thereby.

Example 1

As shown in FIG. 1, the present invention provides a multifunctional integrated industrial sewage treatment system, which comprises an upper tank and a lower tank, wherein the whole system is arranged on an integrated skid block. The lower layer box body is sequentially provided with a centralized storage pool 1, an acid water tank 3, an alkaline water tank 5, a pre-biochemical treatment pool 7, an aerobic pool 9 and a secondary sedimentation pool 10, and the upper layer box body is sequentially provided with a primary flocculation pool 2, a COD (chemical oxygen demand) filtering pool 4, a secondary flocculation pool 6 and an anaerobic pool 8. The double-layer arrangement greatly saves the occupied area of equipment, and the multifunctional integration of nitrogen removal and COD removal improves the sewage treatment efficiency.

The centralized storage pool 1 is connected with a primary flocculation tank 2 through a lifting device, one side of the primary flocculation tank 2 is connected with an acid water tank 3 through the lifting device, the other side of the primary flocculation tank is connected with an anaerobic tank 8 through a return pipe 20, the acid water tank 3 is connected with a COD (chemical oxygen demand) filtering tank 4 through the lifting device, the COD filtering tank 4 is connected with a basic water tank 5 through the lifting device, the basic water tank 5 is connected with a secondary flocculation tank 6 through the lifting device, one side of the secondary flocculation tank 6 is connected with the anaerobic tank 8 through the return pipe 20, the other side of the secondary flocculation tank is connected with a pre-biochemical treatment tank 7 through the lifting device, the pre-biochemical treatment tank 7 is connected with the anaerobic tank 8 through the lifting device, the anaerobic tank 8 is connected with an aerobic tank 9 through the lifting device, and the aerobic tank 9 is connected with a secondary sedimentation tank 10 through the lifting device; and aeration devices or air blast devices are respectively arranged in the primary flocculation tank 2, the COD filtering tank 4, the secondary flocculation tank 6, the biochemical pretreatment tank 7 and the aerobic tank 9. The aeration device comprises a micro aeration pipe 16, an aeration pipeline 17, an air bubble generator 18 and an aeration valve 19, wherein the micro aeration pipe 16 is connected with the air bubble generator 18 through the aeration pipeline 17, and the aeration pipeline 17 is provided with the aeration valve 19. The lifting device comprises a water pump 14 and a water pipe 15, and the two ends of the water pump 14 are connected with the water pipe 15.

Two water inlets are arranged in the centralized treatment tank 1, and the alkaline waste liquid after paint removal and the acidic waste liquid after rust removal are respectively introduced into the tank; the centralized treatment tank 1 is internally provided with a stirrer 11 for stirring the acidic treatment liquid and the alkaline treatment liquid in the neutralization tank, so that sludge is prevented from depositing at the bottom of the tank. Be equipped with first PAC doser 12 and first PAM doser 13 on the centralized processing pond 1, throw PAC, PAM to the pond in through the doser to open the agitator 11 stirring.

A water pump 14 is arranged outside the primary flocculation tank 2, and the sewage liquid treated by the chemicals added in the centralized treatment tank 1 is introduced into the primary flocculation tank 2. The micro aeration pipe 16 is arranged in the box body of the primary flocculation tank 2, micro bubbles with the diameter smaller than 3mm can be released, and the micro bubbles are used for aeration and acceleration of flocculation reaction. The micro aeration pipe 16 is arranged at the top of the box body. And the sludge after the flocculation reaction is introduced into an anaerobic tank 8, and the clear liquid is introduced into an acid water tank 3.

A water pump 14 is arranged outside the acidic water tank 3, waste liquid in the primary flocculation tank 2 is introduced into the acidic water tank 3, hydrochloric acid is added into the acidic water tank 3 by using an acidic solution doser 21, and the pH value in the acidic water tank 3 is adjusted to 3-4. And adjusting the pH value in the acid water tank 3, and judging an adjustment result by using pH test paper.

The COD filtering tank 4 is arranged on the upper layer of the alkaline water tank 5 and internally provided with a three-level filtering system which comprises an upper-layer stone filtering layer, a middle-layer activated carbon filtering layer and a lower-layer gauze cushion layer. The micro aeration pipe 16 is arranged at the bottom of the COD filtering tank 4, can release micro bubbles with the diameter less than 3mm for aeration, and increases the contact area of the waste liquid and the filtering material. A water pump 14 is arranged outside the COD filtering tank 4, and waste liquid with the pH value of 3-4 is introduced into the COD filtering tank 4. The waste liquid flows from the top layer to the bottom layer and is filtered by the three-stage filter material for about half an hour. And the waste liquid treated by the COD filtering tank 4 is transferred into the alkaline water tank 5 through a water pump 14.

And an alkaline solution feeder 22 is arranged on the alkaline water tank 5, sodium hydroxide is fed into the tank through the feeder, and the pH of the waste liquid is adjusted to about 8. And adjusting the pH value in the alkaline water tank, and judging an adjustment result by using pH test paper. And transferring the adjusted alkaline waste liquid into a secondary flocculation tank 6 through a water pump 14.

The secondary flocculation tank 6 is arranged on the upper layer of the biochemical pretreatment tank 7 and is internally provided with an aeration device. And a second PAC doser 23 and a second PAM doser 24 are arranged on the secondary flocculation tank 6, PAC and PAM are added into the secondary flocculation tank 6 through the dosers, and an aeration device is opened to perform flocculation reaction. The sludge after the flocculation reaction is introduced into an anaerobic tank 8. And introducing the clear liquid after the flocculation reaction into a pre-biochemical treatment tank 7.

A water pump 14 is arranged outside the pre-biochemical treatment tank 7, liquid in the secondary flocculation tank is introduced into the pre-biochemical treatment tank 7, and the pre-biochemical treatment tank 7 contains a biochemical pretreatment medicament. The pre-biochemical treatment tank 7 is internally provided with an aeration device, and the aeration device is started during the pre-biochemical treatment to ensure that the pre-biochemical reaction is sufficient.

A water pump 14 is arranged outside the anaerobic tank 8, and waste liquid in the pre-biochemical treatment tank 7 is introduced into the anaerobic tank 8. The anaerobic tank 8 contains anaerobic bacteria. At the moment, the lift pump and the aeration device are closed, and the anaerobic treatment time is 3 to 4 days. The anaerobic tank 8 is internally provided with a heating wire 25, and the anaerobic tank 8 is externally provided with a controller 26 and a temperature sensor 27 for monitoring the temperature in the anaerobic tank 8 and adjusting the temperature in the anaerobic tank 8 in time.

A water pump 14 is arranged outside the aerobic tank 9, and waste liquid in the anaerobic tank 8 is introduced into the aerobic tank 9. The aerobic tank 9 contains aerobic bacteria. The aerobic tank 9 is internally provided with a micro aeration pipe 16, an aeration device is started, and the aerobic treatment time is 1-2 days. An electric heating wire 25 is arranged in the aerobic tank 9, and a controller 26 and a temperature sensor 27 are arranged outside the aerobic tank 9 and used for monitoring the temperature in the aerobic tank 9 and adjusting the temperature in the aerobic tank 9 in time.

A water pump 14 is arranged outside the secondary sedimentation tank 10 and is used for introducing the wastewater after the aerobic treatment. The waste water is subjected to mud-water separation in the secondary sedimentation tank 10. The settled sludge is transported away by a sludge transport vehicle, and the rest clear liquid is discharged after being detected by a water quality detector 28 to reach the standard.

Example 2

the generated wastewater is led into a centralized storage pool 1 and stored in a centralized way.

② PAC and PAM medicaments are put into the centralized storage pool 1, and the stirrer 11 is started. The dosage of the medicament needs to be determined by taking a water sample in advance and carrying out tests. The initial amount of wastewater in the centralized storage pool 1 is calculated, and the medicament is put into the centralized storage pool at one time.

Thirdly, the wastewater is introduced into the primary flocculation tank 2, and the flocculation reaction is promoted through the aeration of the aeration device. The sludge after the reaction is introduced into an anaerobic tank 8, and the clear liquid is introduced into an acid water tank 3.

Fourthly, hydrochloric acid is added into the acid water tank 3 to adjust the pH of the waste liquid to 3-4, and a water pump 14 is used for transferring the waste liquid to the COD filtering tank 4.

Fifthly, after the upper layer stone filtration, the middle layer active carbon filtration and the lower layer gauze cushion filtration treatment for half an hour, the bottom is aerated by a miniature aeration pipe 16, and then the waste liquid is transferred to an alkaline water tank 5 through a water pump 14.

Sixthly, adding alkaline liquor into the alkaline water tank 5 to adjust the pH value to about 8, and then transferring the waste liquor into the secondary flocculation tank 6 through a water pump 14.

And seventhly, adding PAC and PAM medicaments into the secondary flocculation tank 6, and aerating by an aeration device to perform flocculation reaction. The sludge after the reaction is introduced into an anaerobic tank 8, and the clear liquid is introduced into a pre-biochemical treatment tank 7. At the moment, the removal rate of COD and BOD can reach more than 70 percent.

Introducing the waste liquid into a pre-biochemical treatment tank 7, adding a sufficient amount of pre-biochemical treatment agent, starting an aeration device, and reacting for 24 hours.

Ninthly, introducing the waste liquid into an anaerobic tank 8, adding sufficient anaerobic bacteria, closing a water pump 14 and an aeration device, and carrying out full-silent treatment for 3-4 days. At the moment, the content of organic matters (namely nitrogen content) in the waste liquid is not reduced, and the organic macromolecular pollutants which are difficult to degrade in the sewage are subjected to acidolysis through an anaerobic process, so that the macromolecular pollutants which are difficult to degrade are degraded into micromolecules which are easy to degrade. If the weather is cold, the anaerobic bacteria are heated by the heating wire 25, and the activity of the anaerobic bacteria is ensured.

Introducing the waste liquid into an aerobic tank 9 at the red spot, adding enough aerobic bacteria, starting an aeration device, and treating for 1-2 days. At the moment, organic macromolecules in the waste liquid are degraded into micromolecules, and the micromolecules are further degraded by aerobic bacteria, so that the total nitrogen content is reduced. If the weather is cold, the aerobic bacteria are heated by the heating wire 25, so that the activity of the aerobic bacteria is ensured.

⑪ the treated liquid is led into the secondary sedimentation tank 10 for mud-water separation. The settled sludge is transported away by a sludge transport vehicle, and clear liquid is discharged after being detected by a water quality detector 28 to reach the standard.

The sewage treatment system can realize the integrated treatment of COD and ammonia nitrogen in industrial wastewater, the treatment capacity of the COD reaches 97 percent, and the treatment capacity of the ammonia nitrogen reaches 96 percent. The wastewater treatment process is simple, the cost is lower, the treatment effect is good, the occupied area of equipment is small, and the engineering application value is great.

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 multifunctional integrated industrial sewage treatment system is characterized by comprising an upper layer box body and a lower layer box body, wherein the lower layer box body is sequentially provided with a centralized storage pool (1), an acid water tank (3), an alkaline water tank (5), a pre-biochemical treatment pool (7), an aerobic pool (9) and a secondary sedimentation pool (10), and the upper layer box body is sequentially provided with a primary flocculation pool (2), a COD (chemical oxygen demand) filter pool (4), a secondary flocculation pool (6) and an anaerobic pool (8);

the concentrated storage pool (1) is connected with a primary flocculation pool (2) through a lifting device, one side of the primary flocculation pool (2) is connected with an acid water tank (3) through the lifting device, the other side of the primary flocculation pool is connected with an anaerobic pool (8) through a return pipe (20), the acid water tank (3) is connected with a COD filtering pool (4) through the lifting device, the COD filtering pool (4) is connected with a basic water tank (5) through the lifting device, the basic water tank (5) is connected with a secondary flocculation pool (6) through the lifting device, one side of the secondary flocculation pool (6) is connected with the anaerobic pool (8) through the return pipe (20), the other side of the secondary flocculation pool is connected with a biochemical pretreatment pool (7) through the lifting device, the biochemical pretreatment pool (7) is connected with the anaerobic pool (8) through the lifting device, and the anaerobic pool (8) is connected with an aerobic pool (9) through the lifting device, the aerobic tank (9) is connected with the secondary sedimentation tank (10) through a lifting device; and aeration devices or air blast devices are respectively arranged in the primary flocculation tank (2), the COD filtering tank (4), the secondary flocculation tank (6), the biochemical pretreatment tank (7) and the aerobic tank (9).

2. The multifunctional integrated industrial sewage treatment system according to claim 1, wherein two water inlets are arranged in the centralized treatment tank (1) for respectively introducing the alkaline waste liquid after paint removal and the acidic waste liquid after rust removal into the tank; concentrate in the processing pond (1) and be equipped with agitator (11), be equipped with first PAC doser (12) and first PAM doser (13) on concentrate processing pond (1).

3. The system for multifunctional integrated industrial sewage treatment according to claim 1, wherein the aeration device comprises a micro aeration pipe (16), an aeration pipeline (17), an air bubble generator (18) and an aeration valve (19), the micro aeration pipe (16) is connected with the air bubble generator (18) through the aeration pipeline (17), and the aeration pipeline (17) is provided with the aeration valve (19).

4. The multifunctional integrated industrial sewage treatment system according to claim 1, wherein an acidic solution feeder (21) is arranged on the acidic water tank (3), and the acidic solution is fed into the acidic water tank (3) through the acidic solution feeder (21) to adjust the pH of the waste liquid in the acidic water tank (3) to 3-4.

5. The multifunctional integrated industrial sewage treatment system according to claim 1, wherein the COD filtering tank (4) is arranged on the upper layer of the alkaline water tank (5), a three-stage filtering system is arranged in the COD filtering tank (4) and comprises an upper-layer stone filtering layer, a middle-layer activated carbon filtering layer and a lower-layer gauze cushion layer, and the waste liquid flows from the top layer to the bottom layer.

6. The multifunctional integrated industrial sewage treatment system according to claim 1, wherein an alkaline solution feeder (22) is arranged on the alkaline water tank (5), and the alkaline solution is fed into the alkaline water tank (5) through the alkaline solution feeder (22) to adjust the pH of the waste liquid in the alkaline water tank (5) to 8.

7. The multifunctional integrated industrial sewage treatment system according to claim 1, wherein a second PAC doser (23) and a second PAM doser (24) are arranged on the secondary flocculation tank (6).

8. The system of claim 1, wherein anaerobic bacteria are disposed in the anaerobic tank (8), aerobic bacteria are disposed in the aerobic tank (9), heating wires (25) are disposed in the anaerobic tank (8) and the aerobic tank (9), and a controller (26) and a temperature sensor (27) are disposed outside the anaerobic tank (8) and the aerobic tank (9) for monitoring and adjusting the temperature in the anaerobic tank (8) and the aerobic tank (9).

9. The multifunctional integrated industrial sewage treatment system according to claim 1, wherein a water quality detector (28) is arranged on one side of the secondary sedimentation tank (10).

10. The multifunctional integrated industrial sewage treatment system according to claim 1, wherein said lifting device comprises a water pump (14) and a water pipe (15), and both ends of said water pump (14) are connected with the water pipe (15).

11. The multifunctional integrated industrial sewage treatment method based on the system of any one of claims 1 to 10, which is characterized by comprising the following steps:

leading the generated industrial sewage into a centralized storage pool (1) for centralized storage;

adding a flocculating agent into the centralized storage pool (1) and uniformly stirring;

introducing industrial sewage into a primary flocculation tank (2), aerating by an aeration device, introducing the sludge after reaction into an anaerobic tank (8), and introducing clear liquid into an acidic water tank (3);

adding an acidic solution into the acidic water tank (3), and moving the industrial sewage to a COD (chemical oxygen demand) filter tank (4) by using a lifting device;

filtering by a COD filtering tank (4), aerating the bottom by an aeration device, and transferring the industrial sewage into an alkaline water tank (5) by a lifting device;

adding an alkaline solution into the alkaline water tank (5), and transferring the industrial sewage into a secondary flocculation tank (6) through a lifting device;

a flocculating agent is put into the secondary flocculation tank (6), aeration is carried out through an aeration device, flocculation reaction is carried out, the sludge after the reaction is introduced into an anaerobic tank (8), and clear liquid is introduced into a pre-biochemical treatment tank (7);

introducing industrial sewage into a pre-biochemical treatment tank (7), adding a pre-biochemical treatment agent, and starting an aeration device;

then introducing the industrial sewage into an anaerobic tank (8), adding anaerobic bacteria, closing a lifting device and an aeration device, and performing full-silent treatment;

introducing industrial sewage into an aerobic tank (9), adding aerobic bacteria, and starting an aeration device;

and introducing the treated liquid into a secondary sedimentation tank (10) for mud-water separation, conveying the settled sludge by a sludge conveying vehicle, and discharging the clear liquid after the clear liquid reaches the standard through detection.

12. The method as claimed in claim 11, wherein if the weather is cold, the temperature is controlled to be 15-35 ℃ by heating wires (25) in the anaerobic tank (8) and the aerobic tank (9).

13. The method according to claim 11, wherein the COD filtering tank (4) is internally filtered for half an hour, the pre-biochemical treatment tank (7) is internally reacted for 24 hours, the anaerobic tank (8) is internally treated for 3 to 4 days in a complete silent manner, and the aerobic tank (9) is internally treated for 1 to 2 days.