Efficient oil-removing, hardness-removing, impurity-removing, filtering and precipitating device

Abstract

The utility model provides an efficient oil-removing, hardness-removing, impurity-removing, filtering and precipitating device, which can efficiently remove insoluble pollutants such as oil, suspended solids, colloids, hardness, alkalinity, scaling silicon and the like in industrial wastewater at the same time by virtue of the efficient oil-removing, hardness-removing and impurity-removing device, is high in removal efficiency and simple in process, and comprises a bracket, an aeration reaction tank, a coagulation reaction area, a flocculation area, a settling area, a water producing tank and a precision filtering area are arranged on the bracket. The aeration reaction tank is communicated with the coagulation reaction zone, the coagulation reaction zone is communicated with the flocculation zone, the flocculation zone is communicated with the settling zone, the settling zone is communicated with the precision filtering zone, the precision filtering zone is communicated with the water producing tank, the aeration reaction tank is communicated with two water inlets, and the two water inlets are respectively arranged at the bottom and the top of the aeration reaction tank. Dosing pipes are arranged at the tops of the coagulation reaction area and the flocculation area, and mixing stirrers are arranged on the coagulation reaction area and the flocculation area.

Description

Technical Field

[0001] The utility model relates to the technical field of industrial wastewater treatment, in particular to a high-efficiency oil-removing, hard-removing, impurity-removing, filtering and sedimentation device. Background Art

[0002] Industrial wastewater refers to wastewater and waste liquids discharged during the production process. Depending on the degree of contamination, industrial wastewater can be divided into two categories: production wastewater and production sewage. Production wastewater refers to water that has become slightly contaminated or heated during use (such as equipment cooling water); production sewage refers to water that has become severely contaminated during use and is often highly hazardous.

[0003] The pollutants in wastewater mainly include suspended solids, colloids, low molecular weight organic matter, inorganic ions, dissolved gases, microorganisms, etc., which usually have many types of pollutants, high salt concentrations, and are difficult to treat. If not treated thoroughly, it will cause serious environmental pollution. However, many industrial wastewaters have complex compositions and changeable properties.

[0004] Industrial wastewater treatment technologies primarily include sedimentation and filtration, membrane separation, microbial treatment, and evaporation and crystallization. To ensure efficient and stable operation of membrane and evaporation crystallization equipment, pretreatment is typically required at the front end of the industrial wastewater treatment process. These include filtration to remove large amounts of suspended solids, solid particles, and colloids from the wastewater; chemical precipitation to remove scaling substances such as hardness and alkalinity; and oil removal to remove oil from the wastewater. These numerous pretreatment technologies can, to a certain extent, prevent clogging and scaling of membrane and evaporation crystallization equipment.

[0005] The main problems with current pretreatment technology are that the equipment has a simple structure and a relatively single filtering function, and cannot remove multiple pollutants at the same time. If used in series, it will lead to problems such as long process flow and difficult operation. Utility Model Content

[0006] In response to the defects in the existing technology, the technical problem solved by the present invention is: the main problem of the current pretreatment technology is that the equipment structure is simple, the filtering function is relatively single, and it cannot remove multiple pollutants at the same time. If used in series, it will lead to long process flow and difficult operation. The present invention provides a high-efficiency oil removal, hardness removal, impurity removal, filtering and sedimentation device.

[0007] In order to achieve the above objectives, the present invention provides:

[0008] A high-efficiency oil removal, hardness removal, impurity removal, filtering and sedimentation device includes a bracket, on which are arranged an aeration reaction tank, a coagulation reaction zone, a flocculation zone, a sedimentation zone, a water production tank, and a precision filtration zone. The aeration reaction tank is connected to the coagulation reaction zone, the coagulation reaction zone is connected to the flocculation zone, the flocculation zone is connected to the sedimentation zone, the sedimentation zone is connected to the precision filtration zone, and the precision filtration zone is connected to the water production tank.

[0009] Preferably, the aeration reaction tank is connected to two water inlets, which are respectively arranged at the bottom and the top of the aeration reaction tank.

[0010] Preferably, the tops of the coagulation reaction zone and the flocculation zone are both provided with dosing pipes, the coagulation reaction zone and the flocculation zone are both provided with mixing agitators, a central barrel is provided in the flocculation zone, and the coagulation reaction zone is connected to a sludge return pipe.

[0011] Preferably, an exhaust pipe is provided on the top of the sedimentation zone, a magnetic flap level gauge is provided in the sedimentation zone, the bottom of the sedimentation zone is connected to a first mud discharge pipe, and the sludge return pipe is connected to the first mud discharge pipe.

[0012] Preferably, a plurality of membrane shells are provided in the precision filtration area, a water distributor is provided on the top of each of the plurality of membrane shells, a second mud discharge pipe is connected to the bottom of each of the plurality of membrane shells, and a same mud discharge port is connected to the first mud discharge pipe and the second mud discharge pipe.

[0013] Preferably, multiple membrane shells are provided with coarse filter elements, and backwash mud discharge valves are provided at the bottoms of multiple coarse filter elements. Fine filter elements are provided in multiple coarse filter elements, and multiple fine filter elements are connected to the same pipeline. Two water production pipes are connected to the pipeline, one water production pipe is connected to the water production pool, and the other water production pipe is connected to a water pump, and the water pump is connected to a backwash pipe, and the backwash pipe is connected to the water production pool.

[0014] Compared with the prior art, the advantages of the present invention are:

[0015] (1) The high-efficiency oil removal, hardness removal and impurity removal device can simultaneously remove oil, suspended matter, colloid, hardness, alkalinity, scaling silicon and other substances from wastewater with high efficiency; it can completely replace the existing oil removal device, hardness removal device, alkalinity removal device and suspended matter removal device and other facilities and equipment, with a small footprint, simple device structure and easy operation.

[0016] (2) The high-efficiency oil removal, hardness removal and impurity removal device fully utilizes the equipment structure steps. A power pump is only required at the raw water inlet and during backwashing. Gravity flow is used in other processes, which reduces the frequent use of power pumps for wastewater transfer during the process and reduces the energy consumption of the pretreatment system.

[0017] (3) The device undergoes multiple reactions and step-by-step filtration, and different reaction zones promote each other, which reduces the difficulty of wastewater treatment and the amount of water treatment chemicals used.

[0018] The present invention realizes the separation and removal of insoluble pollutants in industrial wastewater. Relying on the high-efficiency oil removal, hardness removal and impurity removal device, the oil, suspended matter, colloid, hardness, alkalinity, scaling silicon and the like in the wastewater can be efficiently removed at the same time. The removal efficiency is high and the process is simple. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This paper presents a structural diagram of a high-efficiency oil removal, hardness removal, impurity removal, filtering and sedimentation device.

[0020] In the figure: 1. Bracket; 2. Aeration reaction tank; 3. Water inlet; 4. Coagulation reaction zone; 5. Flocculation zone; 6. Dosing pipe; 7. Center barrel; 8. Sedimentation zone; 9. Exhaust pipe; 10. Magnetic flap level gauge; 11. Sludge return pipe; 12. First sludge discharge pipe; 13. Water production pipe; 14. Backwash pipe; 15. Water production tank; 16. Water pump; 17. Second sludge discharge pipe; 18. Membrane housing; 19. Coarse filter element; 20. Fine filter element; 21. Water distributor; 22. Sludge discharge port; 23. Backwash sludge discharge valve; 24. Mixing agitator; 25. Precision filtration zone. DETAILED DESCRIPTION

[0021] The embodiments of the present invention are further described in detail below with reference to the accompanying drawings.

[0022] See also Figure 1 As shown, a high-efficiency oil removal, hardness removal, impurity removal, filtering and sedimentation device includes a bracket 1, on which are arranged an aeration reaction tank 2, a coagulation reaction zone 4, a flocculation zone 5, a sedimentation zone 8, a water production tank 15, and a precision filtration zone 25. The aeration reaction tank 2 is connected to the coagulation reaction zone 4, the coagulation reaction zone 4 is connected to the flocculation zone 5, the flocculation zone 5 is connected to the sedimentation zone 8, the sedimentation zone 8 is connected to the precision filtration zone 25, and the precision filtration zone 25 is connected to the water production tank 15.

[0023] In this embodiment, the aeration reaction tank 2 is connected with two water inlets 3 , and the two water inlets 3 are respectively arranged at the bottom and the top of the aeration reaction tank 2 .

[0024] In this embodiment, a dosing pipe 6 is provided on the top of the coagulation reaction zone 4 and the flocculation zone 5, a mixing agitator 24 is provided on the coagulation reaction zone 4 and the flocculation zone 5, a central barrel 7 is provided in the flocculation zone 5, and a sludge return pipe 11 is connected to the coagulation reaction zone 4.

[0025] In this embodiment, an exhaust pipe 9 is provided at the top of the sedimentation zone 8, a magnetic flap level gauge 10 is provided in the sedimentation zone 8, a first mud discharge pipe 12 is connected to the bottom of the sedimentation zone 8, and a sludge return pipe 11 is connected to the first mud discharge pipe 12.

[0026] In this embodiment, multiple membrane shells 18 are provided in the precision filtration area 25, and a water distributor 21 is provided on the top of each of the multiple membrane shells 18. The bottoms of the multiple membrane shells 18 are connected to the same second mud discharge pipe 17, and the first mud discharge pipe 12 and the second mud discharge pipe 17 are connected to the same mud discharge port 22.

[0027] In this embodiment, a plurality of the membrane shells 18 are provided with coarse filter elements 19, and a backwash mud discharge valve 23 is provided at the bottom of each of the coarse filter elements 19. A fine filter element 20 is provided in each of the coarse filter elements 19, and the plurality of fine filter elements 20 are connected to the same pipeline. The pipeline is connected to two water production pipes 13, one water production pipe 13 is connected to the water production pool 15, and the other water production pipe 13 is connected to a water pump 16, and the water pump 16 is connected to a backwash pipe 14, and the backwash pipe 14 is connected to the water production pool 15.

[0028] Working method:

[0029] (1) Wastewater first enters the aeration reaction tank 2, and air is introduced into the reaction tank through the aeration head to separate the oil substances in the wastewater from the water. To improve the separation efficiency, the air is pressurized and sprayed into the reaction zone through the nano-scale micro-bubble aeration head, while ensuring that the air and wastewater are in countercurrent contact, with a contact time of not less than 2 seconds. Nano-micro bubbles can carry the oil substances in the wastewater, including floating oil and emulsified oil, upward, and the oil molecules gradually condense and become larger during the rising process to achieve separation from the water;

[0030] (2) The effluent from the aeration reaction tank 2 enters the coagulation reaction zone 4. By adding reagents to the coagulation reaction zone 4 and utilizing the chemical reaction precipitation principle, the hardness, alkalinity, and scaling silicon in the wastewater are precipitated in the form of precipitation. The added reagents include one or more of liquid alkali, lime, sodium carbonate, polyaluminum chloride (PAC), polyferric sulfate (PFS), etc.; through chemical reactions, small alum flocs will be formed in the coagulation reaction zone 4. Among them, the main component of lime is calcium oxide, which is prepared into a slurry concentration of about 10%, PAC slurry concentration of 5%, PAM solution concentration of 2%, sodium carbonate slurry concentration of 20%, and liquid alkali concentration of 30%.

[0031] (3) The effluent from the coagulation reaction zone 4 enters the central barrel of the flocculation reaction zone 7 from the bottom. Flocculant (PAM) is further added to the flocculation reaction zone 7 to promote the aggregation and growth of alum flocs to form chemical sludge. In order to add reaction, the coagulation reaction zone 4 is equipped with a stirrer with a stirrer speed of 10000 and a stirring time of 2 minutes.

[0032] (4) The effluent from the flocculation reaction zone 7 enters the precipitation reaction zone 8. In the precipitation reaction zone 8, the separation of water and flocs is achieved through the interception effect of the inclined tube. The clear liquid from the precipitation reaction zone 8 enters the precision filtration zone 25 through the top overflow port, and the reaction precipitate is introduced into the mud discharge port 22 from the first mud discharge pipe 12 at the bottom of the precipitation reaction zone 8 and discharged through the mud discharge port 22. A mixing agitator 24 is provided in both the coagulation reaction zone 4 and the flocculation reaction zone 7, and stirring is performed by the mixing agitator 24 for 3 minutes;

[0033] (5) The wastewater entering the precision filtration zone 25 is evenly distributed into the filter tube through the water distributor 21. The wastewater first passes through the coarse filter element 19 to intercept the alum flocs entrained from the precipitation reaction zone, and then further passes through the fine filter element 20 under the action of re-pressure to intercept and remove the tiny particles in the wastewater. The pore size of the coarse filter element 19 is 0.1-0.5μm, and the pore size of the fine filter element 20 is 0.01-0.05μm;

[0034] (6) The produced water after being filtered in the precision filtration zone 25 is discharged from the water production pipe 13 into the water production pool 15. After a period of operation, impurities are trapped and attached to the surface of the coarse filter element 19 and the fine filter element 20 in the filter tube, resulting in a decrease in the filter tube flux. The water pump 16 and the backwash pipe 14 can be used to reversely clean the produced water of the coarse filter element 19 and the fine filter element 20. The backwash sludge valve 23 can discharge the backwashed sludge, and the sludge can be discharged through the second sludge discharge pipe 17;

[0035] (7) After being treated by a high-efficiency oil removal, hardness removal and impurity removal device, the petroleum content in the produced water is reduced to ≤1 mg / L, the hardness is reduced to below 200 mg / L, the alkalinity is ≤20 mg / L, the silica is ≤10 mg / L, and the SS is ≤1 mg / L;

[0036] (8) In this device, a portion of the sludge discharged from the precipitation reaction zone is returned to the coagulation reaction zone 4. The precipitated sludge is used as crystal nuclei to accelerate the reaction of wastewater and reagents in the coagulation reaction zone 4 to form small alum flocs, while reducing the amount of reagents added to the reaction. The remaining portion is discharged from the device through the sludge discharge pipe. The sludge return ratio is 5%-10%.

[0037] The present invention is not limited to the above-mentioned optimal implementation mode. Anyone can derive other forms of products under the inspiration of the present invention. However, no matter what changes are made in the shape or structure, any product with the same or similar technical solutions as the present invention is within the scope of protection.

Claims

1. A high-efficiency oil removal, hardness removal, impurity removal, filtering and sedimentation device, comprising a bracket (1), characterized in that: The support (1) is provided with an aeration reaction tank (2), a coagulation reaction zone (4), a flocculation zone (5), a sedimentation zone (8), a water production tank (15), and a precision filtration zone (25); the aeration reaction tank (2) is connected to the coagulation reaction zone (4), the coagulation reaction zone (4) is connected to the flocculation zone (5), the flocculation zone (5) is connected to the sedimentation zone (8), the sedimentation zone (8) is connected to the precision filtration zone (25), and the precision filtration zone (25) is connected to the water production tank (15).

2. The high-efficiency oil removal, hardness removal, impurity removal, filtering and sedimentation device according to claim 1 is characterized by: The aeration reaction tank (2) is connected to two water inlets (3), which are respectively arranged at the bottom and the top of the aeration reaction tank (2).

3. The high-efficiency oil removal, hardness removal, impurity removal, filtering and sedimentation device according to claim 1 is characterized by: The tops of the coagulation reaction zone (4) and the flocculation zone (5) are both provided with dosing pipes (6), the coagulation reaction zone (4) and the flocculation zone (5) are both provided with mixing agitators (24), a central barrel (7) is provided in the flocculation zone (5), and the coagulation reaction zone (4) is connected to a sludge return pipe (11).

4. The high-efficiency oil removal, hardness removal, impurity removal, filtering and sedimentation device according to claim 1 is characterized by: An exhaust pipe (9) is provided at the top of the sedimentation zone (8), a magnetic flap level gauge (10) is provided in the sedimentation zone (8), a first mud discharge pipe (12) is connected to the bottom of the sedimentation zone (8), and a sludge return pipe (11) is connected to the first mud discharge pipe (12).

5. The high-efficiency oil removal, hardness removal, impurity removal, filtering and sedimentation device according to claim 4 is characterized by: A plurality of membrane shells (18) are provided in the precision filtration area (25), a water distributor (21) is provided on the top of each of the plurality of membrane shells (18), the bottoms of the plurality of membrane shells (18) are connected to the same second mud discharge pipe (17), and the first mud discharge pipe (12) and the second mud discharge pipe (17) are connected to the same mud discharge port (22).

6. The high-efficiency oil removal, hardness removal, impurity removal, filtering and sedimentation device according to claim 5, characterized in that: A plurality of membrane shells (18) are provided with coarse filter elements (19), and a backwashing mud discharge valve (23) is provided at the bottom of each of the coarse filter elements (19). A fine filter element (20) is provided in each of the coarse filter elements (19), and the plurality of fine filter elements (20) are connected to the same pipeline. The pipeline is connected to two water production pipes (13), one water production pipe (13) is connected to the water production pool (15), and the other water production pipe (13) is connected to a water pump (16), and the water pump (16) is connected to a backwashing pipe (14), and the backwashing pipe (14) is connected to the water production pool (15).

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