CN216946522U - High-energy-efficiency air floatation sewage treatment system - Google Patents

Abstract

The utility model provides a high-energy-efficiency air-flotation sewage treatment system, wherein oily sewage is filtered by a pretreatment system and then enters a micro-bubble air-dissolving device group, a flocculating agent is filled with a prying agent and liquid medicine is introduced into the micro-bubble air-dissolving device group to break emulsion of oil drops, and a pipe section is arranged in the micro-bubble air-dissolving device and can generate micro-bubbles by introducing the air. The micro-bubbles are mixed with sewage and the medicament to form a gas-liquid-solid three-phase mixture. The pollutants are captured by the medicament and contacted with the micro-bubbles after being fully mixed by the micro-bubble gas dissolving unit. After the three-phase mixed liquid enters the air floatation tank, the medicament and pollutants are lifted to the upper part by tiny bubbles to form floating slag, and the floating slag instantly covers the upper part of the whole air floatation tank. The scum scraper scrapes the scum into the scum tank, and the scum is pumped to a sludge system by a scum pump and discharged. And the liquid in the air floatation tank is discharged through a liquid discharge system. The system is a full-flow oily sewage treatment system, increases the contact and capture effects of medicaments and pollutants, can meet the sewage treatment requirement at one time, and has the characteristics of high efficiency and low energy consumption.

Description

High-energy-efficiency air floatation sewage treatment system

Technical Field

The utility model belongs to the technical field of oily sewage treatment, and particularly relates to an energy-efficient air floatation sewage treatment system.

Background

The industrial wastewater treatment is a main problem in environmental protection projects due to wide sources, large flow, multiple component types, complex treatment process and the like, and various oily sewage in the industrial wastewater is one of the wastewater which is difficult to treat. The oil in the oily sewage comprises natural petroleum, petroleum products, tar and fraction thereof, edible animal and vegetable oil and fat; according to the dispersion in water, the oil is classified into emulsified oil, dispersion liquid, non-emulsified oil and dissolved oil.

As the oil concentration difference of the wastewater discharged by different industrial departments is large, for example, the oil content of the oil field produced water is about 5000-10000ppm, the oil content of the wastewater produced in the oil refining process is about 150-800 mg/L, the tar content of the coking wastewater is about 500-3000 mg/L, and the tar content of the wastewater discharged by a gas generation station can reach 2000-3000 mg/L. The oily wastewater is treated by firstly recovering floating oil or heavy oil; emulsified oil and dispersed oil in wastewater are difficult to treat. If the oily wastewater is not recycled, the waste is caused; when the water is discharged into rivers, lakes or gulfs, the water body is polluted, and the survival of aquatic organisms is influenced; when used for agricultural irrigation, the fertilizer can block soil gaps and prevent crops from growing.

The current oily sewage treatment comprises biological method, chemical method, physical and chemical method and the like. The physical and chemical methods mainly comprise air flotation, filtration, adsorption, coagulation, gravity method and other technical means. The biological method is to utilize organic matter in water as the nutrients of microbes, and the treatment is relatively thorough, and the discharged liquid has low oil content, but the oil content in the liquid is required to be not high, otherwise the toxicity is high, and the microbes are inactivated. The filtration and adsorption methods cannot be used to treat the high viscosity and high content of filtered sewage, and require frequent back purging and filter media replacement. The coagulation method utilizes various polymer agents to remove organic and inorganic pollutants in the state of colloid and tiny suspended matters in the wastewater, and can also remove certain soluble substances in the wastewater, such as arsenic, mercury and the like, and phosphorus elements causing eutrophication of water bodies, but has the defects of high operating cost and large amount of generated sludge. The air floatation treatment is the most suitable method for treating oily sewage, but the traditional air floatation device has poor aeration effect and low medicament utilization rate, and the oil removal rate of discharged liquid cannot meet the requirement.

Therefore, the development of a high-efficiency and low-energy-consumption high-energy-efficiency air-flotation sewage treatment system is urgently needed, and is a problem to be solved urgently by technical personnel in the field.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a high-energy-efficiency air floatation sewage treatment system which has the characteristics of high efficiency and low energy consumption.

In order to solve the technical problem, the utility model provides an energy-efficient air-flotation sewage treatment system, which comprises:

the pretreatment system is used for filtering the oily sewage;

the microbubble dissolved air flotation system comprises a flocculating agent filling pry, a microbubble dissolved air unit, a polymer filling pry, an air flotation tank, a slag scraping machine, an oil slag tank and an oil slag pump, wherein an inlet of the flocculating agent filling pry is communicated with the pretreatment system, an outlet of the flocculating agent filling pry is communicated with a water inlet of the microbubble dissolved air unit, the polymer filling pry is communicated with a medicament filling port of a water inlet pipe of the microbubble dissolved air unit, a water outlet of the microbubble dissolved air unit is communicated with an inlet of the air flotation tank, the slag scraping machine is arranged at the top of the air flotation tank, a slag discharging port of the air flotation tank is communicated with a slag inlet of the oil slag tank, and a slag discharging port of the oil slag tank is communicated with the oil slag pump;

the sludge system is communicated with the outlet of the oil residue pump and is used for discharging the sludge in the oil residue tank;

and the liquid discharge system is communicated with the water outlet of the air floatation tank and is used for discharging the liquid in the air floatation tank.

Optionally, in the above high energy efficiency air-flotation sewage treatment system, a guide plate sleeve is arranged in the microbubble dissolved air unit, a rotational flow guide plate is mounted on the guide plate sleeve, and a sleeve provided with a plurality of small holes is arranged at a top air inlet pipe of the microbubble dissolved air unit, so that micro bubbles can be generated.

Optionally, in the energy-efficient air-flotation sewage treatment system, the microbubble dissolved air-flotation system further includes a liquid inlet pump communicating between the flocculant filling skid and the microbubble dissolved air group.

Optionally, in the energy-efficient air flotation sewage treatment system, the microbubble dissolved air flotation system further includes a buffer tank, an inlet of the buffer tank is communicated with the pretreatment system, and an outlet of the buffer tank is communicated with the inlet header pipe of the liquid inlet pump.

Optionally, in the energy-efficient air-flotation sewage treatment system, the liquid inlet pump, the microbubble dissolved air group and the polymer dosing pry are in one-to-one correspondence.

Optionally, in the energy-efficient air-flotation sewage treatment system, the liquid inlet pump includes a first liquid inlet pump and a second liquid inlet pump, the microbubble gas dissolver group includes a first microbubble gas dissolver and a second microbubble gas dissolver, and the polymer dosing skid includes a cationic polymer dosing skid and an anionic polymer dosing skid;

an outlet of the flocculant filling pry is communicated with an inlet main pipeline of the liquid inlet pump through a pipeline, an inlet main pipeline of the liquid inlet pump is divided into two parts, one part is communicated with an inlet of the first liquid inlet pump, the other part is communicated with an inlet of the second liquid inlet pump, an outlet of the first liquid inlet pump is communicated with a water inlet of the first micro-bubble gas dissolver, and an outlet of the second liquid inlet pump is communicated with a water inlet of the second micro-bubble gas dissolver;

cation medicament filling sled with the medicament filling mouth intercommunication of the inlet tube of first microbubble air dissolver, anion medicament filling sled with the medicament filling mouth intercommunication of the inlet tube of first microbubble air dissolver, cation medicament filling sled is connected with second microbubble air dissolver inlet tube upper portion medicament filling mouth, anion medicament filling sled with the medicament filling mouth intercommunication of the inlet tube of second microbubble air dissolver.

Optionally, in the above high energy efficiency air-flotation sewage treatment system, a compression fan is further included, and an outlet of the compression fan is communicated with an air inlet of the microbubble dissolved air group.

Optionally, in the energy-efficient air-flotation sewage treatment system, the pretreatment system includes a grid tank and an inclined plate filter, an inlet of the grid tank is used for introducing oily sewage, an outlet of the grid tank is communicated with a water inlet of the inclined plate filter, and a water outlet of the inclined plate filter is communicated with the microbubble dissolved air-flotation system.

Optionally, in the energy-efficient air-flotation sewage treatment system, the sludge system includes a sludge buffer tank and a screw stacking machine, an inlet header pipe of the sludge buffer tank is connected to a sludge discharge pipeline of the grid pond and a sludge discharge port of the inclined plate filter, respectively, and an outlet of the sludge buffer tank is connected to an inlet of the screw stacking machine.

Optionally, in the energy-efficient air-flotation sewage treatment system, the liquid discharge system includes a liquid discharge pump, and an inlet of the liquid discharge pump is communicated with the air-flotation tank and an outlet of the liquid discharge pump is communicated with the outside.

Optionally, in the energy-efficient air-flotation sewage treatment system, the air-flotation tank includes a pressure relief chamber, an air flotation chamber and a water discharge chamber that are communicated with each other, the pressure relief chamber is used for fully mixing and relieving pressure of a mixture of gas, water and a medicament, a water outlet of the microbubble dissolved air unit is communicated with an aeration nozzle of the pressure relief chamber, the oil residue tank is connected with the top of the air flotation chamber, and a water outlet of the water discharge chamber is communicated with the liquid discharge system.

Optionally, in the energy-efficient air flotation sewage treatment system, the pressure relief chamber, the air flotation chamber and the drainage chamber are communicated through a vertical partition plate, a pressure relief nozzle is arranged in the pressure relief chamber, and the pressure relief nozzle is communicated with a liquid discharge port of the air flotation tank.

Optionally, in the energy-efficient air-flotation sewage treatment system, a pattern plate is arranged at the lower part of the air-flotation chamber, and a plurality of large holes are formed in the pattern plate;

the upper part of the air flotation chamber is provided with the slag scraper, and a scraper is arranged on the slag scraper;

the top of the air flotation chamber is provided with a sealing cover plate, the sealing cover plate is provided with a breather valve and a safety valve, and the breather valve and the safety valve are opened when the pressures respectively reach set values.

Optionally, in the energy-efficient air-flotation sewage treatment system, a spraying device is arranged in the oil residue tank.

The utility model provides an energy-efficient air floatation sewage treatment system, which has the following beneficial effects:

oily sewage is filtered and physically intercepted by a pretreatment system, then enters a micro-bubble air dissolving group, a flocculating agent is added with a pry to feed liquid medicine into a water inlet pipe of the micro-bubble air dissolving group, oil drops are demulsified, the liquid medicine and the oily sewage are mixed and then enter the micro-bubble air dissolving group, a pipe section is arranged in the micro-bubble air dissolving group, and a plurality of fine micro-bubbles can be generated after ventilation. The micro bubbles are contacted with the oily sewage and the medicament and then mixed to form a gas-liquid-solid three-phase mixture. Through the full mixing of the micro-bubble gas dissolving group, as much as possible of pollutants are captured by the medicament and are contacted with the micro-bubbles. After the three-phase mixed liquid enters the air flotation tank, the medicament and the pollutants adhered to the medicament are lifted to the upper liquid surface by tiny bubbles to form scum, and the scum is instantly paved on the upper liquid surface of the whole air flotation tank, and when the scum liquid level reaches a set value, the scum scraping machine is started to scrape the scum to the oil residue tank. The oil residue in the oil residue tank is pumped out of a sludge system discharge system through an oil residue pump. The liquid in the air floatation tank is discharged out of the system through a liquid discharge system. The system is a full-flow oily sewage treatment system, the microbubble dissolved air floatation system is favorable for the expansion of the medicament into linear macromolecular substances, the contact and capture effects of the medicament and pollutants are increased, the requirement of oily and particle-containing sewage treatment can be met at one time, the follow-up treatment is not needed, and the system has the characteristics of high efficiency and low energy consumption.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.

FIG. 1 is a schematic view of a system flow of an energy-efficient air-flotation sewage treatment system provided by the utility model.

In the upper diagram:

a pretreatment system: 110-a grid tank; 120-inclined plate filter;

microbubble dissolved air flotation system: 210-flocculating agent filling prying; 221-a first liquid inlet pump; 222-a second liquid inlet pump; 231-a first microbubble aerator; 232-a second microbubble dissolver; 241-cationic polymer dosing pry; 242-anionic polymer dosing pry; 250-air floatation tank; 251-a pressure relief chamber; 260-slag scraping machine; 270-oil residue tank; 280-oil residue pump; 290-a buffer tank;

a sludge system: 310-sludge buffer tank; 320-stacking a snail machine;

a liquid drainage system: 400-liquid discharge pump;

an air inlet system: 500-compression fan.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.

In the description of the present invention, it should be understood that the orientation or positional relationship referred to in the description of the orientation, such as the upper, lower, front, rear, left, right, etc., is based on the orientation or positional relationship shown in the drawings, and is only for convenience of description and simplification of description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.

In the description of the present invention, the meaning of a plurality is more than two, if there are first and second described for the purpose of distinguishing technical features, but not for indicating or implying relative importance or implicitly indicating the number of indicated technical features or implicitly indicating the precedence of the indicated technical features.

In the description of the present invention, unless otherwise specifically limited, terms such as set, installation, connection and the like should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meanings of the above terms in the present invention by combining the specific contents of the technical solutions.

The core of the utility model is to provide a high-energy-efficiency air-flotation sewage treatment system which has the characteristics of high efficiency and low energy consumption.

In order to make those skilled in the art better understand the technical solutions provided by the present invention, the present invention will be further described in detail with reference to the accompanying drawings and specific embodiments.

Referring to fig. 1, the present invention provides an energy efficient air flotation sewage treatment system, which comprises a pretreatment system, a micro bubble dissolved air flotation system, a sludge treatment system, and a liquid discharge system.

Wherein, pretreatment systems are used for carrying out the filtration with oily sewage.

The micro-bubble dissolved air floatation system comprises a flocculating agent filling pry 210, a micro-bubble dissolved air unit, a polymer dosing pry, an air floatation tank 250, a slag scraping machine 260, an oil residue tank 270 and an oil residue pump 280. Wherein, the import and the pretreatment systems intercommunication of flocculating agent filling sled 210, the export of flocculating agent filling sled 210 and the water inlet intercommunication of microbubble dissolved air ware group, the medicament filling mouth intercommunication of polymer medicine adding sled and the inlet tube of microbubble dissolved air ware group, the delivery port of microbubble dissolved air ware group and the entry intercommunication of air supporting pond 250, the top in air supporting pond 250 sets up scum machine 260, the row's cinder notch in air supporting pond 250 and the entering cinder notch intercommunication of oil sediment jar 270, the row's cinder notch and the oil sediment pump 280 intercommunication of oil sediment jar 270. Specifically, the agent inside the flocculant priming lever 210 is typically an inorganic polymer flocculant. The micro-bubble gas dissolving unit is internally provided with a rotational flow guide plate for accelerating the mixing of the medicament and the oily sewage. The top of the micro-bubble air dissolver is provided with an air inlet, a pipe section with a plurality of small holes is arranged in the air inlet, and a plurality of fine micro-bubbles can be generated after the air is ventilated. The micro bubbles are contacted with the liquid and the medicament which are swirled on the guide plate and then mixed to form a gas-liquid-solid three-phase mixture.

And the sludge system is communicated with the outlet of the oil residue pump 280 and is used for discharging the sludge in the oil residue tank 270.

And the liquid discharge system is communicated with the water outlet of the air floatation tank 250 and is used for discharging the liquid in the air floatation tank 250.

The working principle is that oily sewage is filtered and physically intercepted by the pretreatment system, then enters the microbubble dissolved air unit, meanwhile, the flocculating agent filling pry 210 feeds liquid medicine into the water inlet pipe of the microbubble dissolved air unit to break emulsion of oil drops, the liquid medicine and the oily sewage are mixed and then enter the microbubble dissolved air unit, a pipe section is arranged in the microbubble dissolved air unit, and a plurality of fine microbubbles can be generated after ventilation. The micro bubbles are contacted with the oily sewage and the medicament and then mixed to form a gas-liquid-solid three-phase mixture. Through the full mixing of the micro-bubble gas dissolving group, as much as possible of pollutants are captured by the medicament and are contacted with the micro-bubbles. When the three-phase mixed liquid enters the air flotation tank 250, the medicament and the pollutants adhered to the medicament are lifted to the upper liquid surface by tiny bubbles to form scum, and instantly cover the whole liquid surface on the upper part of the air flotation tank 250, and when the scum liquid level reaches a set value, the scum scraping machine 260 is started to scrape the scum to the scum tank 270. The oil residue in the oil residue tank 270 is pumped out of the sludge system discharge system by an oil residue pump 280. The liquid in the air floatation tank 250 is discharged out of the system through a liquid discharge system.

The utility model provides an energy-efficient air floatation sewage treatment system which is used for treating various pollutants in wastewater, such as organic matters, particulate matters, total oil and the like. The treatment system is particularly suitable for a treatment system with large flow and high content of pollutants, after treatment, COD, particulate matters and total oil in the wastewater can respectively reach below 30mg/L, the numerical value of the latest standard requirement is met, and advanced treatment such as a walnut shell filter or an activated carbon filter is not needed. The entire system is made up of several sections, and the modular design is more easily flexible for use in various water treatment projects.

In a specific embodiment, the microbubble dissolved air flotation system further comprises a liquid inlet pump communicated between the flocculant filling pry 210 and the microbubble dissolved air group to improve the circulation power of the liquid.

In order to realize the buffering of the liquid circulation between the pretreatment system and the microbubble dissolved air flotation system, the microbubble dissolved air flotation system further comprises a buffer tank 290, the inlet of the buffer tank 290 is communicated with the pretreatment system, and the outlet of the buffer tank 290 is communicated with the inlet header pipe of the liquid inlet pump.

In a preferred embodiment, the liquid inlet pump, the microbubble dissolved gas group and the polymer dosing pry are in one-to-one correspondence. Under the condition of carrying out mixed treatment waste water to multiple medicament, need design many pipelines, and multiunit corresponding feed liquor pump, microbubble dissolved air ware group and polymer add the medicine sled to realize the reaction process of many medicaments.

In the upper segment characters, it should be explained that the number of microbubble dissolved gas ware group can be the multiunit, and every group microbubble dissolved gas ware group can also include a plurality of microbubble dissolved gas wares that establish ties in proper order to improve microbubble's output efficiency. Specifically, the microbubble air dissolver group comprises 8-16 microbubble air dissolvers which are divided into two groups, and the two groups of air dissolvers are connected in parallel and are arranged on two sides of the air floatation tank 250. The air dissolvers of each group are respectively connected in series by pipelines.

The microbubble air dissolver is cylindrical and has 4 pipe orifices, the side pipe orifice is a liquid inlet pipe orifice, a branch pipe for filling medicament is arranged on the liquid inlet pipe, the top is an air inlet, and the bottom is a liquid outlet. The water inlet of the first dissolved air nozzle of each group of air dissolvers is connected with the outlet of the liquid inlet pump, the water inlet pipe is provided with a medicament filling port of polymer, the top part is provided with an air inlet, and the lower part is provided with a liquid outlet; the liquid outlet at the bottom of the first air dissolver is connected with the liquid inlet of the second air dissolver, no medicament is filled into the branch pipe, and the air inlet at the top is sealed; a liquid outlet at the bottom of the second air dissolver is connected with a third air dissolver, a medicament filling port is sealed, and a gas inlet at the top is sealed; a liquid outlet at the bottom of the third air dissolver is connected with the fourth air dissolver, a medicament filling branch pipe is omitted, and a cationic medicament filling port is arranged at the top of the third air dissolver; the liquid outlet at the bottom of the fourth air dissolver is connected with the nozzle of the fifth air dissolver, no medicament filling branch pipe is arranged, and the anion medicament filling port is arranged at the top. When the water quality is more complex, the number of each group of spray heads is increased, the number of groups of spray heads is also increased, and the positions of the cationic medicament filling port and the anionic medicament filling port are adjusted accordingly. And a pressure gauge is arranged at the top of each air dissolver.

The inside guide plate sleeve pipe that is equipped with the whirl guide plate of certain width of cover pipe is installed to microbubble air dissolver. The top air inlet pipe extends into the air dissolver in the form of a sleeve, namely, inside the guide plate sleeve. The top air inlet pipe is fully distributed with small holes, the diameter of each small hole is between 3mm and 18mm, and the height of each layer of small holes corresponds to the height of the rotational flow guide plate. The periphery of the top air inlet pipe is also provided with a rotational flow guide plate with a certain width, and the rotational flow guide plate is connected with a rotational flow sleeve on the guide plate sleeve. A certain deviation angle is formed between the rotational flow guide plate and the horizontal line.

Further, to prevent the particles from wearing through the guide plate, the wall thickness of the guide plate is typically designed to be 1mm to 3 mm.

In one embodiment, if two agents are required to react, then:

the liquid inlet pump comprises a first liquid inlet pump 221 and a second liquid inlet pump 222, the microbubble gas dissolving group comprises a first microbubble gas dissolver 231 and a second microbubble gas dissolver 232, and the polymer dosing pry comprises a cationic polymer dosing pry 241 and an anionic polymer dosing pry 242;

an outlet of the flocculant filling pry 210 is communicated with an inlet main pipeline of the liquid inlet pump through a pipeline, the inlet main pipeline of the liquid inlet pump is divided into two parts, one part is communicated with an inlet of a first liquid inlet pump 221, the other part is communicated with an inlet of a second liquid inlet pump 222, an outlet of the first liquid inlet pump 221 is communicated with a water inlet of a first micro-bubble gas dissolving device 231, and an outlet of the second liquid inlet pump 222 is communicated with a water inlet of a second micro-bubble gas dissolving device 232;

the cationic medicament filling pry is communicated with a medicament filling port of the water inlet pipe of the first micro-bubble gas dissolver 231, the anionic medicament filling pry is communicated with a medicament filling port of the water inlet pipe of the first micro-bubble gas dissolver 231, the cationic medicament filling pry is connected with a medicament filling port at the upper part of the water inlet pipe of the second micro-bubble gas dissolver 232, and the anionic medicament filling pry 242 is communicated with a medicament filling port of the water inlet pipe of the second micro-bubble gas dissolver 232.

The utility model also comprises a compression fan 500, wherein the inlet of the compression fan 500 is communicated with the outside, and the outlet of the compression fan 500 is communicated with the air inlet of the micro-bubble dissolved air group to ventilate the processing system.

In a specific embodiment, the pretreatment system comprises a grating tank 110 and an inclined plate filter 120, wherein an inlet of the grating tank 110 is used for introducing oily sewage, an outlet of the grating tank is communicated with a water inlet of the inclined plate filter 120, and a water outlet of the inclined plate filter 120 is communicated with the micro-bubble dissolved air flotation system. The grille in the grille pool 110 has a filtering function, can intercept large particles and other impurities, and discharges the sewage after coarse filtration. The inclined plate filter 120 can trap particulates having a large particle size and a part of non-emulsified oil.

Specifically, the interior of the grid cell 110 is divided into two chambers: a coarse grid cell and a fine grid cell. The material is 304L or 316L wear-resistant stainless steel. The precision of the grid plates in the coarse grid chamber is high, and mud is discharged.

The inclined plate filter 120 is internally divided into 2-4 chambers, the former two chambers are respectively provided with a thick partition plate and a thin partition plate (sometimes only one partition plate is arranged), and the rear part is provided with 1-2 buffer chambers. The thick and thin partition plates are inclined at a certain angle, and play a role in settling sand and filtering oil stains. The bottom of each chamber of the inclined plate filter 120 is provided with a cone hopper, and the bottom of the cone hopper is provided with a sludge discharge pipe orifice for discharging the oily sludge precipitated to the bottom.

Furthermore, the top of the buffer chamber is provided with an exhaust hole which is connected with an external pipeline through a breather valve, when the pressure of each chamber in the filter is higher than a set value, the breather valve is automatically opened, and the oily gas at the top of each chamber of the filter is exhausted to a specified place.

In a specific embodiment, the sludge system comprises a sludge buffer tank 310 and a screw stacking machine 320, wherein an inlet header pipe of the sludge buffer tank 310 is respectively connected with a sludge discharge pipeline of the grid pond 110 and a sludge discharge port of the inclined plate filter 120, and an outlet of the sludge buffer tank 310 is connected with an inlet of the screw stacking machine 320. When the liquid level of the sludge buffer tank 310 reaches a set value, the sludge is discharged to the screw stacking machine 320 for drying treatment, and dried sludge cakes discharged by the screw stacking machine 320 are packed and transported away.

The slurry is dewatered by a stack screw 320. The screw stacking machine 320 adopts a way that a plurality of layers of spiral fixed rings and movable rings are arranged on a main spiral shaft. The distance between the rings of the front section is larger, and the distance between the rings of the rear section is smaller, and the front section is a dewatering part.

Furthermore, when the spiral pushing shaft rotates, the multiple fixed and movable lamination sheets arranged on the periphery of the pushing shaft move relatively, and water is filtered out from the lamination sheet gaps moving relatively under the action of gravity, so that rapid concentration is realized. The concentrated sludge continuously moves forwards along with the rotation of the spiral shaft; along the outlet direction of the mud cakes, the screw pitch of the screw shaft is gradually reduced, the gap between the rings is also gradually reduced, and the volume of the screw cavity is continuously shrunk; under the effect of exit back pressure board, interior pressure strengthens gradually, and under the spiral promotes axle and moves in proper order and promote in succession, the moisture in the mud is discharged by the extrusion, and the filter cake solid content constantly rises, finally realizes the continuous dehydration of mud.

In the specific embodiment, the drainage system comprises a drainage pump 400, wherein an inlet of the drainage pump 400 is communicated with the air floatation tank 250, and an outlet of the drainage pump 400 is communicated with the outside.

On the basis of the above specific embodiment, the air flotation tank 250 comprises a pressure relief chamber 251, an air flotation chamber and a water drainage chamber which are communicated, the pressure relief chamber 251 is used for fully mixing and relieving pressure of a mixture of gas, water and a medicament, a water outlet of a micro-bubble dissolved air group is communicated with an aeration nozzle of the pressure relief chamber 251, an oil residue tank 270 is connected with the top of the air flotation chamber, and a water outlet of the water drainage chamber is communicated with a liquid drainage system.

Vertical partition boards are arranged among the three chambers, two pressure relief nozzles are arranged in the pressure relief chamber 251, and the pressure relief nozzles are respectively connected with a liquid outlet of the last micro-bubble air dissolver through pipelines. The diameter of the pressure relief nozzle is usually 1.5-4 times of that of the connecting pipeline, and a small hole is formed in the bottom of the pressure relief nozzle.

The lower part of the air flotation chamber is provided with a pattern plate at a certain height away from the bottom plate, and the pattern plate is provided with a plurality of rows of large holes with certain sizes. The upper part of the air flotation chamber is provided with a slag scraper 260, the slag scraper 260 is provided with scrapers, and the number of the scrapers is 2-6. The slag scraper 260 is intermittently turned on by time control. The top of the air floating chamber is provided with a sealing cover plate. The cover plate is provided with a breather valve and a safety valve, and the breather valve and the safety valve are opened when the pressure respectively reaches a set value.

In the embodiment, the oil residue tank 270 is a rectangular pyramid tank, and the upper part of the oil residue tank is connected with the air floatation tank 250, so that the scum on the liquid level of the air floatation tank 250 is completely discharged to the oil residue tank 270. The wall of the oil residue tank 270 is provided with a sight glass.

The top of the oil residue tank 270 is a sealing cover plate. The cover plate is provided with a breather valve and a safety valve, and the breather valve and the safety valve are opened when the pressure respectively reaches a set value.

A spray device is arranged in the oil residue tank 270, and the spray device is periodically opened to backwash the inside of the oil residue tank 270.

The utility model provides an energy-efficient air-flotation sewage treatment system, which comprises the following components:

the system mainly comprises four parts: the system comprises a pretreatment system, a microbubble dissolved air flotation system, a sludge treatment system and a liquid discharge system. The pretreatment system comprises a grating tank 110 and an inclined plate filter 120; a micro-bubble dissolved air group, an air flotation tank 250, a slag scraper 260, an oil residue tank 270, a dosing system (comprising a flocculating agent filling pry 210 and a polymer dosing pry) and an oil residue pump 280; the sludge system mainly comprises a sludge buffer tank 310 and a screw stacking machine 320 system; the drainage system mainly comprises a drainage buffer pool and a drainage pump 400.

The connection mode is as follows: the outlet of the grating tank 110 is communicated with the top water inlet of the inclined plate filter 120 through a pipeline, the side water outlet of the inclined plate filter 120 is communicated with the water inlet of the buffer tank 290 through a pipeline, and the water outlet of the buffer tank 290 is communicated with the inlet main pipe of the liquid inlet pump. The outlet of the flocculant filling pry 210 is communicated with the inlet main pipeline of the liquid inlet pump through a pipeline. The inlet manifold of the feed pump is divided into two streams, one of which is in communication with the inlet of the first feed pump 221 and one of which is in communication with the inlet of the second feed pump 222. The outlet of the first liquid inlet pump 221 is communicated with the water inlet of the first microbubble gas dissolver 231. The outlet of the second liquid inlet pump 222 is communicated with the water inlet of the second microbubble gas dissolver 232.

The cationic agent filling pry is connected with an agent filling port at the upper part of the water inlet pipe of the first micro-bubble gas dissolver 231, and the anionic agent filling pry is connected with an agent filling port at the lower part of the water inlet pipe of the first micro-bubble gas dissolver 231; the cationic agent filling pry is connected with an agent filling port at the upper part of the water inlet pipe of the second microbubble air dissolver 232, and the anionic agent filling pry 242 is connected with an agent filling port at the lower part of the water inlet pipe of the second microbubble air dissolver 232.

The outlet of the compressor 500 is connected to the top gas inlets of the first microbubble dissolver 231 and the second microbubble dissolver 232 through pipelines, respectively.

The number of the first microbubble dissolver 231 and the second microbubble dissolver 232 may be plural. For example, the number of the mixing outlets is 4, and the bottom three-phase mixing outlets of the first microbubble air dissolver 01 and the second microbubble air dissolver 01 are respectively connected to the subsequent first microbubble air dissolver 02, first microbubble air dissolver 03, first microbubble air dissolver 04, and second microbubble air dissolver 02, second microbubble air dissolver 03, second microbubble air dissolver 04. The bottoms of the last first micro-bubble gas dissolver 231 and the second micro-bubble gas dissolver 232 are respectively connected with the first aeration nozzle and the second aeration nozzle in the pressure relief chamber 251 through pipelines. The pressure relief chamber 251 is part of the flotation tank 250. The floatation tank 250 is divided into three parts, the first part is a pressure relief chamber 251, the middle chamber is an air floatation chamber, and the third chamber is a drainage chamber; in the pressure release chamber 251, the gas, water and medicament mixture has been obtained intensive mixing, and the pressure is released for zero, and all micro bubbles release in the twinkling of an eye, lift impurity such as sump oil liquid drop and particulate matter to the top, and the dross spreads the upper portion of whole air supporting pond 250, and the top of air supporting pond 250 is for scraping sediment machine 260, scrapes the dross to the oil sediment jar 270 with the scraper of scraping sediment machine 260. The middle part of the water discharge chamber of the air flotation tank 250 is a water discharge port connected with a liquid discharge pump 400 through a pipeline.

The top interface of the floatation tank 250 is connected with an oil residue tank 270. The bottom of the oil residue tank 270 may be a conical structure, and its outlet is connected to the inlet of the oil residue pump 280 through a pipeline. The outlet of the oil residue pump 280 is connected with the sludge discharge main pipe.

The bottom sludge discharge pipeline of the grid pond 110 is connected with the inlet main pipe of the sludge buffer tank 310 through a pipeline, the bottom sludge discharge port of the inclined plate filter 120 is connected with the inlet main pipe of the sludge buffer tank 310 through a pipeline, and the outlet of the sludge buffer tank 310 is connected with the inlet of the screw stacking machine 320.

The principle and the process flow are as follows: the waste water contains a large amount of dirty oil, particles and other impurities, such as oil production water, the oil content is usually about 5000ppm-10000ppm, the particle content is 2000ppm, and the oil content and the particles are treated to be below 30ppm after standard treatment.

The oily sewage is filtered by the grille in the grille pool 110 of the pretreatment system to intercept large particles and other impurities. The sewage after coarse filtration enters the inclined plate filter 120, after the sewage passes through the inclined plate filter 120, particulate matters with larger particle sizes and part of non-emulsified oil are intercepted, at the moment, the particulate matters can be treated to be below 500ppm, the oil content is treated to be 2000ppm-4000ppm, at the moment, most of the dirty oil in the sewage is emulsified oil, and the sewage is difficult to directly carry out physical interception treatment to reach the required range.

Oily sewage is divided into two strands, and the two strands of oily sewage are respectively pumped into a first micro-bubble air dissolver 01 and a first micro-bubble air dissolver B01 of the air floatation treatment device, and meanwhile, a medicament liquid inlet branch pipe is arranged on a water inlet pipe of the micro-bubble air dissolver, and the medicament is usually an inorganic polymer flocculant and can play a role in demulsifying oil drops. The agent and oily sewage are mixed and then enter the microbubble air dissolver together, a swirl guide plate is arranged in the microbubble air dissolver, the swirl guide plate carries out rapid swirl along a certain angle to form a hollow cavity, and in the swirl process, the inorganic polymer flocculant existing in the particle agglomeration device is gradually spread along a swirl path to become a linear body and fully contacts with particulate matters and oil drops in water to be fully captured. The top of the micro-bubble air dissolving device is provided with an air inlet, a pipe section extending into the middle of the rotational flow guide plate is arranged, and a certain number of small holes are distributed on the pipe wall of the pipe section and the bottom surface extending into one end of the pipe section. Gas with certain pressure gets into from the top, through the aperture outside the pipeline section, promptly to the direction blowout of whirl baffle fast, the bubble is cut into tiny microbubble behind the aperture, and the microbubble particle diameter is in control range, and the microbubble volume is less, can not obstruct the contact of medicament and pollutant. The micro bubbles are contacted with liquid and medicament which are swirled on the guide plate and then mixed to form a gas-liquid-solid three-phase mixture. After the rapid rotational flow mixing of a plurality of groups of micro-bubble air dissolvers, gas, liquid and solid phases are fully mixed, and pollutants as much as possible are captured by the medicament and are contacted with micro-bubbles. When the three-phase mixed liquid enters the aeration nozzle of the pressure relief chamber 251, the pressure is released to zero, the medicament and the pollutants adhered to the medicament are lifted to the liquid surface on the upper part of the pressure relief chamber 251 by tiny bubbles to form scum, and the scum is instantly paved on the liquid surface on the upper part of the whole air floatation tank 250, and when the scum liquid level reaches a set value, the scum scraping machine 260 is started to scrape the scum to the oil residue tank 270.

The oil content of water separated from the scum at the lower part of the floatation tank 250 can be lower than 30ppm, the content of particulate matters can be lower than 20ppm, and the direct discharge or other requirements can be met without any subsequent treatment.

The oil residue in the oil residue tank 270 is pumped to the sludge buffer tank 310 by the oil residue pump 280, and the solid impurities in the grating tank 110 and the inclined plate filter 120 are also discharged to the sludge buffer tank 310. When the liquid level of the sludge buffer tank 310 reaches a set value, the sludge is discharged to the screw stacking machine 320 for drying treatment, the dried sludge cakes discharged by the screw stacking machine 320 are packed and transported away, the return water is discharged to the main water inlet in front of the grating tank 110, and the return water is mixed with the incoming liquid and then the series of treatments are carried out again.

The method is characterized in that: the system is a full-flow oily sewage treatment system, can meet the sewage treatment requirement of oily particles at one time, and does not need subsequent treatment. Because the inlet of the air floatation device adopts a high-energy-efficiency microbubble dissolved air nozzle, and a rotational flow guide plate is also arranged in the nozzle, the liquid and the polymer medicament rapidly rotate in a rotational flow manner to increase the flow path of the mixed liquid, the medicament is favorably expanded into linear macromolecular substances, and the contact and capture effects of the medicament and pollutants are increased; the bubble breaking pipe is arranged inside, bubbles entering the air floatation tank 250 are finer, the particle size is within a control range, the contact between blocking pollutants and medicaments caused by the large size of the bubbles is avoided, and the bubbles are guaranteed to be piled and lifted effectively.

The oil content in the water is lower than 30mg/L after the air floatation treatment effect, the treatment efficiency is far higher than that of the existing air floatation device, and meanwhile, the subsequent advanced treatment such as walnut shell filters, activated carbon filters and the like can be replaced, so that the occupied area and the investment of the whole system are greatly reduced, and the system is simple and reliable and is easier to operate.

The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.

The principles and embodiments of the present invention are explained herein using specific examples, which are presented only to assist in understanding the method and its core concepts. It should be noted that, for those skilled in the art, without departing from the principle of the present invention, it is possible to make various improvements and modifications to the present invention, and those improvements and modifications also fall within the scope of the claims of the present invention.

Claims (14)

1. An energy-efficient air supporting sewage treatment system, characterized by comprising:

the pretreatment system is used for filtering the oily sewage;

the microbubble dissolved air flotation system comprises a flocculating agent filling pry, a microbubble dissolved air unit, a polymer filling pry, an air flotation tank, a slag scraping machine, an oil slag tank and an oil slag pump, wherein an inlet of the flocculating agent filling pry is communicated with the pretreatment system, an outlet of the flocculating agent filling pry is communicated with a water inlet of the microbubble dissolved air unit, the polymer filling pry is communicated with a medicament filling port of a water inlet pipe of the microbubble dissolved air unit, a water outlet of the microbubble dissolved air unit is communicated with an inlet of the air flotation tank, the slag scraping machine is arranged at the top of the air flotation tank, a slag discharging port of the air flotation tank is communicated with a slag inlet of the oil slag tank, and a slag discharging port of the oil slag tank is communicated with the oil slag pump;

the sludge system is communicated with the outlet of the oil residue pump and is used for discharging the sludge in the oil residue tank;

and the liquid discharge system is communicated with the water outlet of the air floatation tank and is used for discharging the liquid in the air floatation tank.

2. The energy-efficient air-flotation sewage treatment system as claimed in claim 1, wherein a guide plate sleeve is arranged in the microbubble dissolved air group, a rotational flow guide plate is arranged on the guide plate sleeve, and a sleeve with a plurality of small holes is arranged at a top air inlet pipe of the microbubble dissolved air group to generate micro-bubbles.

3. The energy-efficient air-flotation sewage treatment system according to claim 1, wherein the microbubble dissolved air flotation system further comprises a liquid inlet pump communicating between the flocculant filling skid and the microbubble dissolved air group.

4. The energy-efficient air-flotation sewage treatment system as claimed in claim 3, wherein the microbubble dissolved air flotation system further comprises a buffer tank, an inlet of the buffer tank is communicated with the pretreatment system, and an outlet of the buffer tank is communicated with an inlet header pipe of the liquid inlet pump.

5. The energy-efficient air-flotation sewage treatment system as claimed in claim 3, wherein the liquid inlet pump, the microbubble dissolved air group and the polymer dosing pry are in one-to-one correspondence.

6. The energy-efficient air-flotation sewage treatment system according to claim 5, wherein the liquid inlet pump comprises a first liquid inlet pump and a second liquid inlet pump, the microbubble gas dissolver group comprises a first microbubble gas dissolver and a second microbubble gas dissolver, and the polymer dosing sled comprises a cationic polymer dosing sled and an anionic polymer dosing sled;

an outlet of the flocculant filling pry is communicated with an inlet main pipeline of the liquid inlet pump through a pipeline, an inlet main pipeline of the liquid inlet pump is divided into two parts, one part is communicated with an inlet of the first liquid inlet pump, the other part is communicated with an inlet of the second liquid inlet pump, an outlet of the first liquid inlet pump is communicated with a water inlet of the first micro-bubble gas dissolver, and an outlet of the second liquid inlet pump is communicated with a water inlet of the second micro-bubble gas dissolver;

cation medicament filling sled with the medicament filling mouth intercommunication of the inlet tube of first microbubble dissolved gas ware, anion medicament filling sled with the medicament filling mouth intercommunication of the inlet tube of first microbubble dissolved gas ware, cation medicament filling sled is connected with second microbubble dissolved gas ware inlet tube upper portion medicament filling mouth, anion medicament filling sled with the medicament filling mouth intercommunication of the inlet tube of second microbubble dissolved gas ware.

7. The energy-efficient air-flotation sewage treatment system according to claim 1, further comprising a compression fan, wherein an outlet of the compression fan is communicated with an air inlet of the micro-bubble dissolved air group.

8. The energy-efficient air-flotation sewage treatment system according to claim 1, wherein the pretreatment system comprises a grating tank and an inclined plate filter, an inlet of the grating tank is used for introducing oily sewage, an outlet of the grating tank is communicated with a water inlet of the inclined plate filter, and a water outlet of the inclined plate filter is communicated with the micro-bubble dissolved air flotation system.

9. The energy-efficient air-floating sewage treatment system as claimed in claim 8, wherein said sludge system comprises a sludge buffer tank and a screw stacking machine, the inlet header pipe of said sludge buffer tank is connected with the sludge discharge pipeline of said grid pond and the sludge discharge port of said inclined plate filter, respectively, and the outlet of said sludge buffer tank is connected with the inlet of said screw stacking machine.

10. The energy-efficient air-flotation sewage treatment system according to claim 1, wherein the liquid discharge system comprises a liquid discharge pump, and an inlet of the liquid discharge pump is communicated with the air-flotation tank and an outlet of the liquid discharge pump is communicated with the outside.

11. The energy-efficient air-flotation sewage treatment system according to any one of claims 1 to 10, wherein the air flotation tank comprises a pressure relief chamber, an air flotation chamber and a water drainage chamber which are communicated with each other, the pressure relief chamber is used for fully mixing and relieving pressure of a mixture of air, water and a medicament, the water outlet of the micro-bubble air dissolving group is communicated with an aeration nozzle of the pressure relief chamber, the oil residue tank is connected with the top of the air flotation chamber, and the water drainage outlet of the water drainage chamber is communicated with the liquid drainage system.

12. The energy-efficient air-flotation sewage treatment system according to claim 11, wherein the pressure relief chamber, the air flotation chamber and the water discharge chamber are communicated through vertical partition plates, a pressure relief nozzle is arranged in the pressure relief chamber, and the pressure relief nozzle is communicated with a liquid discharge port of the air flotation tank.

13. The energy-efficient air-floating sewage treatment system as claimed in claim 11, wherein a flower plate is arranged at the lower part of the air floating chamber, and a plurality of large holes are arranged on the flower plate;

the upper part of the air flotation chamber is provided with the slag scraper, and a scraper is arranged on the slag scraper;

the top of the air flotation chamber is provided with a sealing cover plate, the sealing cover plate is provided with a breather valve and a safety valve, and the breather valve and the safety valve are opened when the pressures respectively reach set values.

14. The energy-efficient air-flotation sewage treatment system as claimed in claim 1, wherein a spraying device is arranged in the oil residue tank.

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