CN110372077A - Load coalescence flocculation plant and a kind of oil-contaminated water processing method - Google Patents

Abstract

The invention discloses a loading coalescence flocculation device and a treatment method for oily sewage. The hydraulic desorber in the device adopts the scheme design of an olive-shaped cavity and a dumbbell-shaped tube. The double-circulation flow of the wall and the outer cylinder wall increases the application time of the force, effectively strengthens the collision and friction between the agglomerated particles, increases the shearing effect of the water flow on the agglomerated particles, and finally realizes the effective cleaning of the agglomerated particles. Thereby increasing the flocculation efficiency. Solve the problem that the existing loading flocculation equipment does not have the cleaning function for the agglomerated particles.

Description

Loading coalescing flocculation device and method for treating oily sewage

technical field

The invention relates to a sewage treatment device in the field of sewage treatment, in particular to a loading flocculation device, and also relates to a method for treating oily sewage.

Background technique

In order to improve the flocculation efficiency, fine sand or magnetic seeds are added to the flocculation system as floc nuclei during the sewage treatment process, which can achieve better results. Among them, the most typical ones are Actiflo® of French Veolia Company and CoMag® loaded flocculation process of American Evoqua Company.

The above loading and flocculation process is only for urban sewage, so only the recovery of micro-sand or magnetic seeds by cyclone separation or magnetic separation technology can meet the requirements, and the cleaning problem of micro-sand or magnetic seeds after recovery is not considered.

If the above-mentioned loading flocculation process is used to treat the ASP flooding sewage in the oil field, it is necessary to add agglomerated particles with the same function as microsand or magnetic seeds. If the particles are not cleaned effectively, the effect of the agglomerated particles as crystal nuclei will be deteriorated with continued use, thereby reducing the flocculation efficiency.

SUMMARY OF THE INVENTION

In view of this, the present invention provides a loaded flocculation device that can clean agglomerated particles, which solves the problem that the existing loaded flocculation equipment does not have a cleaning function for the agglomerated particles, thereby reducing the flocculation efficiency.

In addition, the present invention also provides a method for treating oily sewage.

In a first aspect, a loaded coalescing flocculation device includes a housing, the housing is loaded with oily sewage and coalesced particles, the housing includes a hydraulic elution mechanism and a flocculation mechanism, and the flocculation mechanism is used for the The oil and the agglomerated particles form a complex with the agglomerated particles as the core, and the hydraulic elution mechanism is formed by air stripping, which is composed of the oily sewage, the agglomerated particles and the complex. upflow of liquid, and for the dissociation of the complex; characterized by:

The hydraulic elution mechanism includes: at least one hydraulic desorber;

The hydraulic desorber includes: a cavity and a dumbbell-shaped tube;

The dumbbell-shaped tube is connected in the cavity, and the outer side thereof is coaxially connected to the inner cylinder and the outer cylinder;

The port diameters at both ends of the dumbbell-shaped tube are larger than the diameter of the inner cylinder and smaller than the diameter of the outer cylinder;

the dumbbell-shaped pipe for diverting the rising liquid flow into the annular space between the inner cylinder and the outer cylinder;

The annular space is used for the rising liquid flow to establish a dual-circulation flow centered on the inner cylinder wall and the outer cylinder wall respectively;

The dual circulation flow is used to increase the collision and/or friction time and/or chance between the composite bodies, and the shearing force of the liquid flow on the composite bodies;

The increase in the time, the opportunity, and the shearing force serves to increase the rate and/or extent of dissociation of the agglomerated particles from the complex.

Preferably, at least one of said hydrodesorbers is connected in series.

Preferably, the cavity is an olive-shaped cavity.

Preferably, the port diameters at both ends of the dumbbell-shaped tube are larger than the port diameters at both ends of the olive-shaped cavity.

Preferably, the inner cylinder and the outer cylinder have the same height.

Preferably, the flocculation mechanism includes: an inner cone;

The inner cone is sleeved outside the hydraulic desorber;

A chamber that is gradually opened from top to bottom is formed between the inner cone and the cavity;

The chamber is used for the oil and the agglomerated particle to form a complex with the agglomerated particle as a core therein.

Preferably, the lower end of the flocculation mechanism is connected to the inclined plate separation mechanism;

The sloping plate separating mechanism includes several parallel sloping plates;

The inclined plate is used for the separation of the composite body, the agglomerated particles and the sewage.

Preferably, the lower end of the hydraulic desorber is connected to a stripping mechanism;

the air stripping mechanism, used for delivering gas flow to the hydraulic desorber;

The airflow, as a power source for the mixed liquid composed of the oily sewage, the agglomerated particles and the composite to circulate in the hydraulic elution mechanism, the flocculation mechanism and the swash plate separation mechanism .

Preferably, the lower part of the shell adopts an olive-shaped structure;

The upper cone of the olive-shaped structure has a taper corresponding to the inclination of the inclined plate;

The lower cone of the olive-shaped structure is used for collecting the agglomerated particles and the composite body into the hydraulic elution mechanism along with the airflow.

In a second aspect, a method for treating oily sewage, characterized in that the oily sewage is treated by using the loading coalescence flocculation device described in any one of the above.

The present invention has the following beneficial effects:

The loading coalescing flocculation device of the present invention, wherein the hydraulic desorber adopts the scheme design of the olive-shaped cavity and the dumbbell-shaped tube, and uses the principle of fluid mechanics to establish a dual-circulation flow around the inner cylinder wall and the outer cylinder wall respectively. The application time of the force effectively strengthens the collision and friction between the particles, increases the shearing effect of the water flow on the agglomerated particles, and finally realizes the effective cleaning of the agglomerated particles, thereby improving the flocculation efficiency.

Description of drawings

The above and other objects, features and advantages of the present invention will become more apparent from the following description of embodiments of the present invention with reference to the accompanying drawings, in which:

1 is a schematic structural diagram of a loading coalescence flocculation device according to an embodiment of the present invention;

Fig. 2 is the structural representation of the hydraulic desorber of the embodiment of the present invention;

FIG. 3 is a schematic three-dimensional structure diagram of a hydraulic desorber according to an embodiment of the present invention.

Detailed ways

The present invention will be described below based on examples, but it should be noted that the present invention is not limited to these examples. In the following detailed description of the invention, some specific details are described in detail. However, those skilled in the art can fully understand the present invention for the parts that are not described in detail.

Furthermore, it should be understood by those of ordinary skill in the art that the accompanying drawings are provided only to illustrate the objects, features and advantages of the present invention and are not actually drawn to scale.

Meanwhile, unless the context clearly requires otherwise, throughout the specification and claims, words such as "including", "comprising" and the like should be construed in an inclusive rather than an exclusive or exhaustive sense; that is, "including but not limited to" means.

Fig. 1 is a schematic structural diagram of a loading coalescing flocculation device according to an embodiment of the present invention; as shown in Fig. 1 , the loading coalescing flocculation device includes a shell, the main body of which is a cylinder 8, and the lower end of the cylinder 8 is connected to the upper cone The lower end of the upper cone 7 is connected to the lower cylinder 3 , the lower end of the lower cylinder 3 is connected to the lower cone 2 , and the bottom of the lower cone 2 has a cone bottom 1 .

A water outlet weir 11 is arranged above the inner wall of the cylinder body 8 , and a water outlet pipe 9 is arranged at the position of the water outlet weir 11 . A hopper 12 is connected above the cylinder 8 .

The center of the cylinder body 8 is coaxially connected to the hydraulic desorption mechanism. The hydraulic desorption mechanism includes several hydraulic desorbers 16, preferably 5-7. Several hydraulic desorbers 16 are connected in series up and down.

FIG. 2 is a schematic structural diagram of a hydraulic desorber according to an embodiment of the present invention; FIG. 3 is a schematic three-dimensional structure diagram of the hydraulic desorber according to an embodiment of the present invention. As shown in Figure 2 combined with Figure 3:

The hydraulic desorber 16 includes a throat pipe 16-6, the two ends of the throat pipe 16-6 are respectively connected to the upper cone 16-1 and the lower cone 16-8, and after the connection, a dumbbell-shaped pipe is formed; The outer side is coaxially connected to the inner cylinder 16-3 and the outer cylinder 16-5, preferably the inner cylinder 16-3 and the outer cylinder 16-5 have the same height; the outer side of the outer cylinder 16-5 is connected to the inner cylinder 16-4, and the inner cylinder The two ends of the 16-4 are respectively an upper conical opening 16-2 and a lower conical opening 16-7, and an olive-shaped cavity is formed inside the inner cylinder 16-4 with the upper and lower conical openings.

Among them, the diameters of the upper cone 16-1 and the lower cone 16-8 are the same, larger than the diameter of the inner tube 16-3, smaller than the diameter of the outer tube 16-5; and larger than the upper cone 16-2 and the lower cone 16-7 caliber. The diameters of the upper conical opening 16-2 and the lower conical opening 16-7 are the same.

For the hydraulic desorbers 16 connected in series, a chamber surrounded by several olive-shaped cavities forms a hydraulic desorption zone I;

In FIG. 1 , the lower end of the hydraulic desorber 16 is connected to a stripping mechanism.

The air lift mechanism includes an air lift pipe 20, the upper end of the air lift pipe 20 is connected to the lower conical opening 16-7 of the inner cylinder 16-4, and the lower end adopts a horn structure 21; the air intake pipe 24 enters the air lift pipe from the cone bottom 1 In the horn structure 21 of 20, the outlet of the air inlet pipe 24 is connected to the gas distribution pipe 23, and the gas distribution pipe 23 is connected to the membrane diffuser 22. The gas enters from the air inlet pipe 24 and is dispersed into air bubbles through the membrane diffuser 22 .

In Figure 1, in the cylinder 8, the outside of the hydraulic desorption zone I is connected to the inner cone 10 with a small upper port and a large lower port, and the upper port of the inner cone 10 is connected to the inverted cone 14.

The discharge port of the feeding hopper 12 is located in the inverted cone 14 , and the agglomerated particles 6 are added into the inverted cone 14 through the feeding hopper 12 .

The inverted cone 14 is also connected to a liquid inlet mechanism; the liquid inlet mechanism includes: a liquid inlet pipe 15 , a static mixer 17 , a drug adding pipe 18 , and a water inlet pipe 19 . The oily sewage enters through the water inlet pipe 19, and the chemicals for sewage treatment enter through the dosing pipe 18. The oily sewage and the chemicals are evenly mixed in the static mixer 17 and then added to the inverted cone 14 through the liquid inlet pipe 15, that is, added to the inverted cone 14. Inside the inner cone 10.

The space between the inner cone 10 and the hydraulic desorber 16 forms the loading coalescing flocculation zone II. Since the inner cone 10 has a structure with a small upper opening and a large lower opening, the loading coalescing flocculation zone II is a gradually open area from top to bottom.

In FIG. 1 , in the cylindrical body 8 , a swash plate separating mechanism is connected to the lower part of the inner cone 10 .

The sloping plate separation mechanism includes a number of parallel sloping plates 5 and cones 4 , and the sloping plates 5 are adapted to the inclinations of the upper cone 7 and the cone 4 .

The inclination angle of the inclined plate 5 is 45°-60°, and every two inclined plates 5 constitute a precipitation and separation unit.

The area where the swash plate separation mechanism of the cylinder body 8 is located is the swash plate separation zone III.

Specifically, with reference to the accompanying drawings 1-3, the method and principle of using the loading coalescence flocculation device of the present invention to treat oily sewage will be described:

It can be seen from Figure 1 that the internal space of the device is constructed with a hydraulic desorption zone I, a loading flocculation zone II and an inclined plate separation zone III.

Oily sewage and chemicals enter the inner cone 10 through the liquid inlet mechanism, and continue to fill the overflow weir 11 of the casing. The agglomerated particles 6 are fed into the inner cone 10 through the hopper 12 .

During treatment, the air is dispersed into microbubbles through the membrane diffuser 22 of the air stripping mechanism, and then transported to the hydraulic desorber 16, that is, into the hydraulic desorption zone I, where the air and sewage are mixed to form a gas-liquid mixture. At the same time, the gas content of the sewage in the loading flocculation zone II and the inclined plate separation zone III in the shell is low, so a density difference is formed between the hydraulic desorption zone I and the loading flocculation zone II and the inclined plate separation zone III. , so that the internal circulation flow is established between the hydraulic desorption zone I, the loading flocculation zone II and the inclined plate separation zone III.

That is to say, the hydraulic desorption zone I is the power source of the centralized loading coalescence compact flocculation device, and specifically realizes the material exchange and hydraulic connection between the three functional zones through the principle of air stripping.

The entrainment effect of the above-mentioned internal circulating flow makes the coalesced particles 6 participate in the internal circulating flow together, forming a gas-liquid-solid three-phase mixed liquid in the hydraulic desorption zone I.

Under the action of the internal circulation flow, the three-phase mixed liquid advances to the upper level of the hydraulic desorber 16, and the three-phase mixed liquid exchanges substances between different layers, and is finally circulated and transported to the highest level, from the top of the inverted cone 14. The discharge enters the loading flocculation zone II.

The agglomerated particles 6 are in direct contact with the dispersed oil particles in the water in the coalescence flocculation zone II. Under the action of surface adsorption and coalescence, the oil particles continue to adhere to the surface of the agglomerated particles 6 and gradually coalesce, so that the agglomerated particles 6 The oil layer coated on the surface gradually thickened, thus forming an "oil-agglomerated particle" complex with agglomerated particles as the core.

At the same time, since the loading flocculation zone II is a gradually open area from top to bottom, the velocity gradient G value is gradually reduced, and the agglomerated particles 6 are self-mixed in the loading flocculation zone II, which can effectively prevent the fragmentation of the complex and prevent To achieve tight connection with the separation area of the inclined plate.

In the prior art, in order to increase the chance of adhesion between the coalesced particles and the oil particles, a stirring method is adopted, and the stirring will inevitably cause the flocs to be broken. However, the special structural design of the loading flocculation zone II of the present application can effectively prevent the flocs from being broken.

In the sloping plate separation zone III, the "oil-coalesced particle" complex flows in the same direction as the liquid flow, while the "oil-agglomerated particle" complex flows downward along the upper surface of the lower inclined plate of the precipitation separation unit under the action of gravity. Slip, due to the velocity difference between the liquid phase and the solid phase between the inclined plates, the separation of the solid and the liquid is realized, and it re-enters the hydraulic desorption zone I under the entrainment of the internal circulating water flow.

In the hydraulic desorption zone I, the hydraulic desorber 16 adopts the unique structure of the dumbbell-shaped tube and the olive-shaped cavity, which makes the velocity gradient G change violently alternately, effectively strengthens the collision and friction between particles, and makes the "oil-polymerization" effect. The "agglomerated particles" complex dissociates, that is, the oil particles adhered to the surface of the agglomerated particles are desorbed, so that the agglomerated particles are released again, creating the necessary conditions for re-adhesion in the loading flocculation zone II.

In this way, because the above three functional areas are connected in series, the coalesced particles 6 and the dispersed oil particles perform a continuous "adhesion-desorption" cycle in time and space, so as to achieve the purpose of reusing the coalesced particles 6 and effectively improve the oily sewage. flocculation efficiency.

In addition, in the hydraulic desorption zone I, before the three-phase mixed liquid enters the hydraulic desorber 16, because the diameter of the lower cone 16-8 of the dumbbell-shaped tube is larger than the diameter of the inner tube 16-3, and the throat 16- The diameter of 6 is much smaller than the diameter of the cylinder mouth of the lower cone 16-8, so the throat 16-6 has a limiting effect on the three-phase mixed liquid, and part of the three-phase mixed liquid is self-split to the inner cylinder 16-3 and the outer cylinder 16 according to the pressure. The annular space between -5.

In the process of self-splitting, relative to the outer area of the annular space, since the air first enters the annular space, a density difference is formed between the annular space and the outer area, thereby forming a driving force for the internal circulation of the liquid flow between the annular space and the outer area. Under the action of the driving force, a double circulation flow is formed around the inner cylinder wall and the outer cylinder wall respectively. The double circulation flow can increase the collision and friction time and opportunities between the composites, and at the same time increase the shearing force of the circulating liquid flow on the composites, improve the speed and/or degree of dissociation of coalesced particles from the composites, and achieve the Coalescing particles for efficient cleaning purposes.

It can be seen that in the loading coalescence flocculation device of the present application, the well-cleaned coalescence particles are unloaded into the pre-flocculated oily sewage, and after coalescence loading and the formation of "oil-coalescence particle" complexes, The dissociation of the "oil-coalesced particle" complex completes the "adhesion-desorption" cycle in space and time, and achieves the purpose of making full use of the loading and flocculation function of the agglomerated particles. Separation method.

There are also Actiflo® of French Veolia Company and CoMag® loaded flocculation process of Evoqua Company of the United States. Since the process adopts a "mixing-reaction-precipitation-separation" plane series layout, the process is long and the structure layout is loose.

On the other hand, in the loading flocculation flocculation device of the present application, the loading flocculation zone II and the inclined plate separation zone III are arranged in layers on top of each other, and the structure is more compact.

The above-mentioned embodiments are only the embodiments of the present invention, and the descriptions thereof are specific and detailed, but should not be construed as limiting the scope of the patent of the present invention. It should be pointed out that for those of ordinary skill in the art, without departing from the concept of the present invention, several modifications, equivalent replacements, improvements, etc. can be made, which all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention should be subject to the appended claims.

Claims (10)

1. A loading coalescing flocculation device, comprising a casing, wherein oily sewage and coalescing particles are loaded in the casing, the casing comprises a hydraulic elution mechanism and a flocculation mechanism, and the flocculation mechanism is used for the oil and the agglomerated particles to form a complex with the agglomerated particles as the core, and the hydraulic elution mechanism uses air stripping to form a riser composed of the oily sewage, the agglomerated particles and the complex. Liquid flow, and dissociation for said complex; characterized by: The hydraulic elution mechanism includes: at least one hydraulic desorber (16); The hydraulic desorber (16) includes: a cavity and a dumbbell-shaped tube; The dumbbell-shaped tube is connected to the cavity, and the outer side thereof is coaxially connected to the inner cylinder (16-3) and the outer cylinder (16-5); The port diameters at both ends of the dumbbell-shaped tube are larger than the diameter of the inner cylinder (16-3) and smaller than the diameter of the outer cylinder (16-5); The dumbbell-shaped pipe is used for diverting the rising liquid flow into the annular space between the inner cylinder (16-3) and the outer cylinder (16-5); The annular space is used for the rising liquid flow to establish a dual-circulation flow centered on the inner cylinder wall and the outer cylinder wall respectively; The dual circulation flow is used to increase the collision and/or friction time and/or chance between the composite bodies, and the shearing force of the liquid flow on the composite bodies; The increase in the time, the opportunity, and the shearing force serves to increase the rate and/or extent of dissociation of the agglomerated particles from the complex. 2. The loaded coalescence flocculation device according to claim 1, characterized in that: The hydraulic desorbers (16) are connected in series. 3. The loaded coalescence flocculation device according to claim 1, wherein: The cavity is an olive-shaped cavity. 4. The loaded coalescence flocculation device according to claim 3, characterized in that: The port diameters at both ends of the dumbbell-shaped tube are larger than the port diameters at both ends of the olive-shaped cavity. 5. The loaded coalescence flocculation device according to claim 1, wherein: The inner cylinder (16-3) and the outer cylinder (16-5) have the same height. 6. The loaded coalescence flocculation device according to any one of claims 1-5, characterized in that: The flocculation mechanism includes: an inner cone (10); The inner cone (10) is sleeved on the outside of the hydraulic desorber (16); A chamber gradually opened from top to bottom is formed between the inner cone (10) and the cavity; The chamber is used for the oil and the agglomerated particle to form a complex with the agglomerated particle as a core therein. 7. The loaded coalescence flocculation device according to claim 6, characterized in that: The lower end of the flocculation mechanism is connected to the inclined plate separation mechanism; The sloping plate separating mechanism includes a plurality of parallel sloping plates (5); The inclined plate (5) is used for the separation of the composite body, the agglomerated particles and the sewage. 8. The loaded coalescence flocculation device according to claim 7, characterized in that: The lower end of the hydraulic desorber (16) is connected to a stripping mechanism; The air stripping mechanism is used to deliver air flow to the hydraulic desorber (16); The airflow, as a power source for the mixed liquid composed of the oily sewage, the agglomerated particles and the composite to circulate in the hydraulic elution mechanism, the flocculation mechanism and the swash plate separation mechanism . 9. The loaded coalescence flocculation device according to claim 8, wherein: The lower part of the casing adopts a dumbbell-shaped structure; The upper cone (7) of the dumbbell-shaped structure has a taper corresponding to the inclination of the inclined plate (5); The lower cone (7) of the dumbbell-shaped structure is used to gather the coalesced particles and the composite body into the hydraulic elution mechanism along with the airflow. 10. A method for treating oily sewage, characterized in that: The oily sewage treatment is carried out by using the loaded coalescence flocculation device according to any one of claims 1-9.