CN103214123A - Integrated coagulation-synergism inclined plate oil-removing device - Google Patents

Abstract

The integrated coagulation synergistic inclined plate oil removal equipment is mainly composed of two parts: coagulation and turbidity removal. Among them, the coagulation part realizes the treatment of colloidal oil and emulsified oil through mixing equipment and grid flocculation; the coagulated sewage enters the turbidity and oil removal area through the water distribution orifice, and there are two different types of inclined plates in this area. Both can play the role of sedimentation and turbidity removal and coalescence and oil removal. By changing the installation angle, they are mainly used to achieve the purpose of sedimentation particles and coalescence and oil removal respectively; a V-shaped partition is set in the water outlet area to avoid floating oil Into the outlet pipe; the oil is collected through the V-shaped groove at the upper end of the turbidity and oil removal area, and discharged through the oil discharge pipe; the sediment is collected in the mud hopper, and discharged through the mud discharge pipe. Compared with the prior art, the present invention has the characteristics of high treatment efficiency, good effluent quality, low investment and low treatment cost, can maximize the potential of existing oil removal facilities, and obtain maximum benefits with minimum investment.

Description

Integrated coagulation synergistic inclined plate degreasing equipment

Technical field:

The invention belongs to the technical field of water treatment equipment and relates to an improvement of sewage solid-liquid separation and oil-water separation equipment.

Background technique:

According to the source of oily wastewater and the different forms of oil in water, it can be divided into four categories: slick oil, dispersed oil, emulsified oil and dissolved oil: 1. Slick oil, which floats on the water surface as a continuous phase, forms an oil film or oil layer, and its oil The particle size of the droplet is relatively large, generally greater than 100 μm; 2. Dispersed oil, suspended in water with tiny oil droplets, often becomes oil slick after standing for a certain period of time, and the particle size of the oil droplet is 10-100 μm; 3. Emulsified oil, The water contains surfactants to make the oil a stable emulsion. The particle size of the oil droplets is generally less than 10 μm, and most of them are 0.1-2 μm; 4. Dissolved oil is a kind of dispersed oil that dissolves chemically. The oil is even finer, sometimes as small as a few nanometers.

At present, the treatment of oil production wastewater can be divided into physical methods (gravity sedimentation, mechanical separation, centrifugation, coarse granulation, filtration, membrane separation, etc.), chemical methods (coagulation, acidification, salting out, electrolysis, etc.), physical and chemical methods. (flotation, adsorption, ion exchange, etc.), biological methods (activated sludge, biological filter, oxidation pond, etc.). Due to the large differences in the quality of sewage in various oilfields, the water quality requirements for purified water after treatment are also different. Therefore, each oilfield determines its own sewage treatment process according to its actual situation and water injection requirements. There are four main methods for oil removal.

Natural degreasing can remove slick oil and most of the loose oil in the wastewater. Since natural degreasing does not add coagulant, it only depends on the relative density difference between tiny oil droplets, suspended particles and sewage to float or sink to separate water, mud and oil, so the removal efficiency is low, and the volume is large and the floor area is large. .

Inclined plate degreasing, which is one of the most commonly used efficient degreasing methods, is also a degreasing method using gravity separation technology. The basic principle of inclined plate oil removal is "shallow layer theory". Simply put, the shallower the sedimentation tank, the shorter the sedimentation time and improve the oil removal efficiency.

Coarse-grained oil removal refers to the process in which the oil droplet size changes from small to large when the oil production sewage passes through a device equipped with coarse-grained materials (fillers). Coarse granulation equipment can remove oil droplets larger than 20μm, mainly to remove dispersed oil in wastewater.

Coagulation and degreasing, it is by adding coagulant to the wastewater, through the compression of the double layer and the neutralization effect, the stability of the colloid is destroyed, the colloid is agglomerated, the particles continue to grow, and finally the gravity settles down and is separated and removed. Coagulation and oil removal can remove emulsified oil and colloidal particles in wastewater.

Although there are many treatment methods for oily wastewater, each method has its limitations. If a single method is used, it is difficult to achieve satisfactory results.

Invention content:

In order to solve the above problems, the present invention provides an integrated coagulation synergistic inclined plate oil removal equipment, which combines inclined plate oil removal and coagulation oil removal to achieve efficient oil removal and turbidity removal. It is mainly composed of: water inlet pipe (1), mixing equipment (2), grid flocculation equipment (3), water distribution orifice plate (4), small-angle inclined plate (5), large-angle inclined plate (6), V-shaped partition Plate (7), outlet pipe (8), V-shaped groove (9), oil discharge pipe (10), mud bucket (11), mud discharge pipe (12); its main features are: the equipment consists of coagulation and deturbidity Oil removal is composed of two parts, in which the coagulation area is composed of mixing equipment (2) and grid flocculation equipment (3) to achieve coagulation and synergistic treatment, and then the sewage enters the turbidity and oil removal area through the water distribution orifice (4), and utilizes Two kinds of sloping plates with different angles achieve the purpose of sedimentation and degreasing. The upper surface of the two sloping plates can achieve precipitation, and the lower surface can achieve coalescence and degreasing. The main functions achieved by changing the installation angle are different. The sediment is discharged through the mud discharge device (11), (12), the floating oil is discharged through the V-shaped groove (9) at the upper end of the turbidity and oil removal area, and the V-shaped partition (7) is used in the water outlet area to prevent oil from entering the outlet pipe (8) After the sewage passes through this integrated coagulation synergistic inclined plate degreasing equipment, it can achieve high-efficiency coagulation, sedimentation and degreasing effects.

The coagulation part of the integrated coagulation synergistic inclined plate degreasing equipment adopts two kinds of equipment to achieve efficient mixing effect. The mixing equipment (2) is installed outside the tank body, and the sewage passes through the mixing equipment (2) through the water inlet pipe (1) , enter the equipment, and then pass through the grid flocculation equipment (3) to achieve the purpose of coagulation and efficiency enhancement. The turbidity and oil removal area of the integrated equipment is equipped with sloping plates with two angles. The lower part is a small-angle sloping plate (5), which is mainly used for coalescence and oil removal. The installation angle is 30°-55°, and the upper part is The large-angle inclined plate (6) is mainly used for the precipitation of particles, and its installation angle is 45°-65°. The oil discharge area adopts a V-shaped groove (9), and for the upper oil slick area, the V-shaped groove (9) has the effect of automatically skimming oil, reducing its power consumption. A V-shaped dividing plate (7) is arranged in the water outlet area, causing the oil and water in the water outlet area to be cut off, so as to avoid mixing oil in the water outlet.

Beneficial effects of the present invention:

(1) High efficiency of coagulation, turbidity and oil removal

Due to the rapid mixing, the residence time of sewage in the treatment equipment can be greatly shortened. At the same time, due to the common use of coagulation and inclined plate oil removal, the sharing of two inclined plates with different angles, and the design of V-shaped grooves in the oil discharge area and water outlet area, better three-phase separation efficiency can be achieved, and the subsequent treatment is reduced. equipment load.

(2) Small footprint

Due to the integrated design of the equipment and the high processing efficiency of the equipment, it occupies a small area.

(3) Strong impact resistance, suitable for a wide range of water quality

When the temperature of the raw water, the flow rate of the incoming water, and the dosage of the chemical have some changes, the quality of the effluent water will not be affected.

(4) The effluent water quality is good and the treatment cost is low

Because the equipment does not require mechanical parts, no power consumption, low cost and easy maintenance, it ensures that the effluent water quality is stable and up to standard.

Description of drawings:

Figure 1 Plane view of integrated coagulation synergistic inclined plate degreasing equipment;

Figure 2 Plane view of the mud area of the integrated coagulation synergistic inclined plate degreasing equipment;

Figure 3 is a sectional view of the integrated coagulation synergistic inclined plate degreasing equipment.

Explanation of symbols in the figure:

1. Water inlet pipe 2. Mixing equipment 3. Grid flocculation equipment

4. Water distribution orifice plate 5. Small angle inclined plate 6. Large angle inclined plate

7. V-shaped clapboard 8. Outlet pipe 9. V-shaped groove

10. Oil discharge pipe 11. Mud bucket 12. Mud discharge pipe

Detailed ways:

Sewage and the added chemicals pass through the water inlet pipe (1) and then enter the mixing device (2) outside the equipment for preliminary mixing. Then it enters the mesh flocculation device (3) in the device to strengthen the mixing effect. Enter the turbidity and oil removal area through the water distribution orifice (4). The sewage in the turbidity and oil removal area will pass through two sloping plate equipment. The lower layer is a small-angle sloping plate (5), which is mainly used for oil-water separation to make oil coalesce. The installation angle is 30°-55°, and the upper one is The first layer is a large-angle inclined plate (6), which is mainly used for mud-water separation to make particles settle, and the installation angle is 45°-65°. A V-shaped partition (7) is arranged in the water outlet area, through which the oil and water are cut off to ensure that the outlet water does not contain oil, and the outlet water is discharged through the outlet pipe (8). The floating oil passes through the V-shaped groove (9) at the upper end of the turbidity and oil removal area, and is discharged through the oil discharge pipe (10). The sinking particles are collected through the mud hopper (11) at the lower part of the sedimentation and deoiling area, and then discharged through the mud discharge pipe (12).

Example:

The integrated coagulation synergistic slant plate oil removal equipment is used to treat oil production wastewater in an oilfield. The daily water inflow is 100 cubic meters per day, and the quality of the sewage influent is shown in Table 1.

Table 1 Water quality of oil production wastewater in an oilfield

According to the specific situation, the integrated equipment is 1500mm long, 1000mm wide and 4000mm high according to the water inlet design of 100m ³ /d. The coagulation area adopts high-efficiency micro-vortex mixing equipment and high-efficiency micro-vortex grid equipment. The length of the high-efficiency micro-vortex mixing equipment is 1000mm, and 7 sets of high-efficiency micro-vortex grid equipment are installed in the coagulation area inside the equipment. In the turbidity and oil removal area, the installation angle of the small-angle inclined plate equipment is 45°, and the installation angle of the large-angle inclined plate equipment is 60°. The removal rate of the final integrated equipment for the pollutants in the water quality is as follows: the removal rate of COD is 84.9%, the removal rate of BOD ₅ is 76.3%, the removal rate of SS is 95.8%, and the removal rate of oil content is 89.4%. It can be seen that the integrated coagulation synergistic inclined plate oil removal equipment can achieve efficient coagulation, sedimentation and oil removal, and can effectively reduce the processing load of subsequent treatment facilities.

Claims (5)

1. Integrated coagulation synergistic inclined plate oil removal equipment, including: water inlet pipe (1), mixing equipment (2), mesh flocculation equipment (3), water distribution orifice plate (4), small angle inclined plate (5) , large-angle inclined plate (6), V-shaped partition (7), outlet pipe (8), V-shaped groove (9), oil discharge pipe (10), mud bucket (11), and mud discharge pipe (12); The characteristics are: the equipment is composed of two parts: coagulation synergism and turbidity and oil removal, in which the coagulation area is composed of mixing equipment (2) and mesh flocculation equipment (3) to realize coagulation synergistic treatment; then the sewage passes through the water distribution hole The plate (4) enters the turbidity and oil removal area, and the small-angle inclined plate (5) and the large-angle inclined plate (6) are used to achieve the purpose of settling particles and coalescing to remove oil; the water outlet area adopts a V-shaped partition (7) to avoid floating The oil enters the water outlet pipe (8); the slick oil gathers through the V-shaped groove (9) at the upper end of the turbidity and oil removal area, and is discharged through the oil discharge pipe (10); 12) Discharge; after the sewage passes through this integrated coagulation synergistic inclined plate degreasing equipment, it can achieve efficient three-phase separation effect of oil, water and slag. 2. The integrated coagulation synergistic inclined plate oil removal equipment according to claim 1, characterized in that: the integrated equipment is divided into two parts: coagulation and turbidity removal, and the coagulation part is equipped with grids inside the equipment In addition to the flocculation equipment (3), there is a mixing equipment (2) externally connected to it. The sewage passes through the mixing equipment (2) outside the tank body to achieve preliminary mixing, and then enters the tank body to be further mixed and flocculated by the grid flocculation equipment (3). Thereby realizing the synergistic treatment of colloidal oil and emulsified oil. 3. The integrated coagulation synergistic sloping plate degreasing equipment according to claim 1, characterized in that two different sloping plates are installed in the turbidity and oil removal area, and the upper surfaces of the two sloping plates can be used for sedimentation and degreasing The lower surface can be used for coalescing and degreasing, and the main purpose achieved by changing the installation angle is different; the lower part is a small-angle inclined plate (5), which is mainly used for coalescing and degreasing, and its installation angle is 30°- 55°, the upper part is a large-angle inclined plate (6), which is mainly used for the precipitation of particles, and its installation angle is 45°-65°. 4. The integrated coagulation synergistic inclined plate oil removal equipment according to claim 1, characterized in that: the oil discharge area adopts a V-shaped groove (9), and for the upper oil slick area, the V-shaped groove (9) has The function of automatic oil skimming reduces its power consumption. 5. The integrated coagulation synergistic inclined plate oil removal equipment according to claim 1, characterized in that: a V-shaped partition (7) is arranged in the water outlet area to realize the separation of oil and water in the water outlet area to avoid mixing in the water outlet There are oils.

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