Advanced oxidation treatment device for wastewater

Abstract

The utility model discloses a wastewater advanced oxidation treatment device, which comprises a regulating reservoir and a reaction kettle, a forced circulation pipeline is arranged on the reaction kettle, a strong oxidant adding device is connected onto the forced circulation pipeline, a water outlet end of the regulating reservoir is communicated with the forced circulation pipeline through a water inlet pipeline, a preheater is arranged on the water inlet pipeline, and a water outlet end of the regulating reservoir is communicated with the strong oxidant adding device. The bottom of the reaction kettle is provided with a water outlet pipeline, the water outlet pipeline is sequentially connected with a wastewater cooler, a coagulation reaction tank and a sedimentation tank through the preheater, the upper end of the reaction kettle is connected with a steam pipeline, and the steam pipeline is connected with a secondary steam cooler. According to the preheater, waste water obtained after reaction is pumped into the preheater through a drainage pump, and fresh waste water pumped into the preheater through a water inlet pump is preheated, so that heat of a solution obtained after reaction is fully utilized, the waste water obtained after reaction is cooled, and heat loss is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of sewage treatment, in particular to a wastewater advanced oxidation treatment device. Background Art

[0002] Wastewater contains compounds composed of elements such as C, N, and P. The main pollutants of C include organic matter, etc. High-concentration refractory organic wastewater refers to wastewater with a high concentration of organic matter (measured in COD), which is generally above 2000 mg / L, and some are even as high as tens of thousands to hundreds of thousands of milligrams per liter; the so-called "refractory" means that the biodegradability of this type of wastewater is low (the BOD5 / COD value is generally below 0.3 or even lower, and it is difficult to biodegrade. Therefore, the industry generally refers to organic wastewater with a COD concentration greater than 2000 mg / L and a BOD5 / COD value less than 0.3 as high-concentration refractory organic wastewater.

[0003] The current treatment processes for high-concentration organic wastewater and partial phosphorus, hypophosphorus and organophosphorus-related wastewater include ozone, Fenton, incineration, electrochemical oxidation, separation membrane and biological treatment technology. Some of the above treatment processes have high treatment costs and are not thorough, producing more secondary pollutants; some processes are not thorough and take a long time. Most processes cannot treat abnormal chemical substances such as organic matter and phosphorus at the same time to meet the standards, and during the treatment process, the wastewater entering the reaction needs to be heated up and the discharged wastewater needs to be cooled down, which consumes a lot of energy and leads to high treatment costs. Utility Model Content

[0004] The purpose of the utility model is to provide a wastewater advanced oxidation treatment device to solve the problems raised in the above background technology.

[0005] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0006] A wastewater advanced oxidation treatment device comprises a regulating tank and a reactor, wherein the reactor is provided with a forced circulation pipeline, the forced circulation pipeline is connected with a strong oxidant dosing device, the water outlet end of the regulating tank is connected with the forced circulation pipeline through a water inlet pipeline, the water inlet pipeline is provided with a preheater, the bottom of the reactor is provided with a water outlet pipeline, the water outlet pipeline is connected with a wastewater cooler, a coagulation reaction tank and a sedimentation tank in sequence through the preheater, the upper end of the reactor is connected with a steam pipeline, and the steam pipeline is connected with a secondary steam cooler.

[0007] As a further solution of the utility model: a water inlet pump is provided on the water inlet pipeline.

[0008] As a further solution of the utility model: a forced circulation pump is connected to the forced circulation pipeline, a heater is connected to the forced circulation pipeline, and one end of the water inlet pipeline away from the regulating tank is connected to the water inlet end of the heater.

[0009] As a further solution of the utility model: a drainage pump is provided on the water outlet pipe.

[0010] As a further solution of the utility model: a rotary demister is provided in the reactor.

[0011] As a further solution of the utility model: the reactor is provided with a cylinder and a cone, and both the upper cylinder and the lower cone are provided with a thermometer, and the thermometer is interlocked with the new steam automatic regulating valve on the reactor.

[0012] As a further solution of the utility model: a flange-type differential pressure level gauge is arranged inside the reactor, and the differential pressure level gauge is connected to the water inlet pump signal of the reactor.

[0013] As a further solution of the utility model: the steam pipeline is connected to a vacuum pump.

[0014] As a further solution of the utility model: the secondary steam cooler and the wastewater cooler are connected to a cooling tower.

[0015] As a further solution of the utility model: a sludge pipe is provided at the bottom of the sedimentation tank, a sludge return pipe is provided between the bottom of the sedimentation tank and the coagulation reaction tank, and a sludge pump is provided on the sludge return pipe.

[0016] Compared with the prior art, the beneficial effects of the utility model are:

[0017] 1. The present application is provided with a wastewater preheater and a heater. The preheater uses a drainage pump to pump the reacted wastewater into the preheater to preheat the fresh wastewater pumped into the preheater by a water inlet pump. This not only makes full use of the heat of the post-reacted solution, but also cools the post-reacted wastewater to avoid heat loss.

[0018] 2. The present application uses a reactor to carry out an oxidation reaction under high temperature conditions, thereby oxidizing high-concentration organic wastewater and simultaneously treating compounds composed of elements such as C, N, and P in the wastewater. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a schematic diagram of the process flow of this embodiment;

[0020] In the figure: 1- regulating tank, 2- reactor, 3- coagulation reaction tank, 4- sedimentation tank, 5- water inlet pump, 6- preheater, 7- heater, 8- drainage pump, 9- strong oxidant dosing device, 10- rotary demister, 11- differential pressure level gauge, 12- thermometer, 13- forced circulation pump, 14- secondary steam cooler, 15- cooling tower, 16- wastewater cooler, 17- sludge pump, 18- vacuum pump. DETAILED DESCRIPTION

[0021] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0022] See also Figure 1 In an embodiment of the utility model, a wastewater advanced oxidation treatment device comprises a regulating tank 1 and a reactor 2. A forced circulation pipeline is arranged on the reactor 2. A forced circulation pump 13 is connected to the forced circulation pipeline. A heater 7 is connected to the forced circulation pipeline. One end of the water inlet pipeline away from the regulating tank 1 is connected to the water inlet end of the heater 7. A strong oxidant dosing device 9 is connected to the forced circulation pipeline. The water outlet end of the regulating tank 1 is connected to the forced circulation pipeline through the water inlet pipeline. A water inlet pump 5 is arranged on the water inlet pipeline. A preheater 6 is arranged on the water inlet pipeline.

[0023] A water outlet pipe is provided at the bottom of the reactor 2, and a drainage pump 8 is provided on the water outlet pipe. The water outlet pipe is connected to the wastewater cooler 16, the coagulation reaction tank 3, and the sedimentation tank 4 in sequence through the preheater 6. A steam pipe is connected to the upper end of the reactor 2, and the steam pipe is connected to the vacuum pump 18. The steam pipe is connected to the secondary steam cooler 14. The secondary steam cooler 14 and the wastewater cooler 16 are connected to the cooling tower 15. The cooling tower 15 is connected to the wastewater cooler 16 and the secondary steam cooler 14, and water enters the upper part and discharges the lower part. A sludge pipe is provided at the bottom of the sedimentation tank 4, and a sludge return pipe is provided between the bottom of the sedimentation tank 4 and the coagulation reaction tank 3. A sludge pump 17 is provided on the sludge return pipe. In addition, PAC and PAM dosing devices are provided in the coagulation reaction tank.

[0024] The reactor 2 is provided with a rotary demister 10. The reactor is provided with a cylinder and a cone. The upper cylinder and the lower cone are provided with a thermometer 12. The thermometer 12 is interlocked with the new steam automatic regulating valve on the reactor 2 to stably control the temperature to be maintained at about 120°C to reach the reaction temperature. The reactor 2 is provided with a flange-type differential pressure level gauge 11. The differential pressure level gauge 11 is connected to the signal of the water inlet pump 5 of the reactor 2 to control the liquid level in the reactor to be maintained in the range of 60% to 80%.

[0025] When the utility model is in use, the wastewater in the regulating tank 1 enters the preheater 6 through the water inlet pump 5. The preheater 6 uses the drainage pump 8 to pump the reacted wastewater into the preheater 6 to preheat the fresh wastewater pumped into the preheater 6 by the water inlet pump 5. In this way, the heat of the solution after the reaction is fully utilized, and the wastewater after the reaction is cooled down to avoid heat loss; the preheated wastewater enters the heater 7, and the heater 7 uses fresh steam to circulate and heat the wastewater, and circulates it through the forced circulation pump 13 to reach the set reaction temperature; the heated wastewater enters the reactor 2, and the reactor 2 is placed in a cylinder and a cone respectively set A thermometer 12 is provided, which is interlocked with the new steam automatic regulating valve to stably control the temperature to be maintained at about 120°C to reach the reaction temperature; the reactor 2 body is equipped with a flange-type differential pressure level gauge, and the differential pressure level gauge 11 is interlocked with the reactor 2 water inlet pump to control the liquid level in the reactor 2 to be maintained in the range of 60% to 80%; a rotary demister 10 is provided on the top of the reactor 2, and when the reaction produces a lot of foam, the demister is opened to remove foam to prevent the foam from entering the secondary steam pipeline; a strong oxidant is added between the preheater 6 and the heater 7, and the drainage of the reactor 2 enters the preheater 6 through the drainage pump 8, thereby preheating the inlet water.

[0026] A strong oxidant dosing device 9 is connected to the forced circulation pipeline. In the present embodiment, the oxidant is persulfate, which is an inorganic compound, soluble in water, stable at room temperature, easy to store and transport, convenient and safe to use, and only produces salts after use without other pollutants and toxic substances; the oxidant can produce sulfate radicals (SO4-·) under high temperature conditions, which have a higher redox potential (E0=2.5v-3.1v) and are more oxidizing than ozone; sulfate radicals have a longer and more stable half-life than hydroxyl radicals, which prolongs the continuous contact with organic matter and enhances the degradation effect, can prolong the oxidation time, can degrade certain pollutants that hydroxyl radicals cannot degrade, and can oxidize most C, N, and P compounds. By adding a strong oxidant, persulfate, into the reactor, under high temperature and high pressure reaction conditions, organic matter can be oxidized into carbon dioxide, water and other substances, and organic phosphorus, phosphorous, hypophosphorous and other substances can be oxidized into orthophosphates for complete removal in subsequent coagulation and precipitation, while nitrogen oxides are all oxidized into nitrate nitrogen. If denitrification is required later, denitrification biochemical treatment can be added.

[0027] The vacuum pump 18 extracts the secondary steam and other non-condensable gases in the reactor 2 out of the reactor 2 and maintains the pressure in the reactor 2 at 1.1 kg / cm 2The secondary steam cooler 14 cools the secondary steam and flows into the condensate tank. Part of the effluent from the secondary steam cooler 14 enters the cooling tower 15, and then enters the wastewater cooler 16 for cooling, and then enters the coagulation reaction tank 3. PAC / PAM is added to the coagulation reaction tank 3 for coagulation and sedimentation, and finally enters the sedimentation tank 4. The sludge pump outlet of the sedimentation tank 4 is divided into two routes. One route returns to the coagulation and flocculation reaction tank to increase the number of flocs, speed up the coagulation and flocculation reaction time and enhance the coagulation and flocculation effect, and the other route of sludge is directly discharged from the system.

[0028] It is obvious to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be regarded as exemplary and non-restrictive from any point of view, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims be included in the present invention. Any reference numeral in a claim should not be regarded as limiting the claim to which it relates.

[0029] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A wastewater advanced oxidation treatment device, comprising a regulating tank (1) and a reaction kettle (2), characterized in that: The reactor (2) is provided with a forced circulation pipeline, and a strong oxidant dosing device (9) is connected to the forced circulation pipeline. The water outlet of the regulating tank (1) is connected to the forced circulation pipeline through a water inlet pipeline, and a preheater (6) is provided on the water inlet pipeline. The bottom of the reactor (2) is provided with a water outlet pipeline, and the water outlet pipeline is connected to a wastewater cooler (16), a coagulation reaction tank (3), and a sedimentation tank (4) in sequence through the preheater (6). The upper end of the reactor (2) is connected to a steam pipeline, and the steam pipeline is connected to a secondary steam cooler (14).

2. A wastewater advanced oxidation treatment device according to claim 1, characterized in that: A water inlet pump (5) is provided on the water inlet pipeline.

3. A wastewater advanced oxidation treatment device according to claim 1, characterized in that: A forced circulation pump (13) is connected to the forced circulation pipeline, a heater (7) is connected to the forced circulation pipeline, and one end of the water inlet pipeline away from the regulating tank (1) is connected to the water inlet end of the heater (7).

4. A wastewater advanced oxidation treatment device according to claim 1, characterized in that: The water outlet pipe is provided with a drainage pump (8).

5. The wastewater advanced oxidation treatment device according to claim 1, characterized in that: A rotary demister (10) is provided in the reaction kettle (2).

6. The wastewater advanced oxidation treatment device according to claim 1, characterized in that: The reactor is provided with a cylinder and a cone, and both the upper cylinder and the lower cone are provided with a thermometer (12), and the thermometer (12) is interlocked with the new steam automatic regulating valve on the reactor (2).

7. The wastewater advanced oxidation treatment device according to claim 2, characterized in that: A flange-type differential pressure level gauge (11) is arranged inside the reactor (2), and the differential pressure level gauge (11) is in signal communication with the water inlet pump (5) of the reactor (2).

8. The wastewater advanced oxidation treatment device according to claim 1, characterized in that: The steam pipeline is connected to a vacuum pump (18).

9. The wastewater advanced oxidation treatment device according to claim 1, characterized in that: The secondary steam cooler (14) and the wastewater cooler (16) are connected to a cooling tower (15).

10. The wastewater advanced oxidation treatment device according to claim 1, characterized in that: A sludge pipeline is provided at the bottom of the sedimentation tank (4), a sludge return pipeline is provided between the bottom of the sedimentation tank (4) and the coagulation reaction tank (3), and a sludge pump (17) is provided on the sludge return pipeline.

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