Recycling and in-situ recycling device for Fenton sludge

Abstract

The utility model discloses a Fenton sludge resource in-situ recycling device which comprises a skid-mounted shell, a feeding pump, an acid adjusting reaction tank, a sedimentation tank, an electrooxidation reduction tank and a discharging pump are arranged in the skid-mounted shell, a sludge discharging opening and an axial flow fan are arranged at the top of the skid-mounted shell, a reaction stirrer is arranged in the acid adjusting reaction tank, and a sludge discharging opening is formed in the top of the skid-mounted shell. An acid medicine tank is arranged on one side of the acid adjusting reaction tank, a dissolved medicine stirrer is arranged on the acid medicine tank, a feeding port and a discharging port are formed in the two sides of the skid-mounted shell respectively, and the electrooxidation reduction tank comprises a tank body, a direct-current power source, an anode and a cathode. The utility model belongs to the technical field of water treatment, and particularly solves the problems that the existing Fenton sludge treatment cost is high, and environmental pollution is easily caused.

Description

Technical Field

[0001] The utility model belongs to the technical field of water treatment, and specifically refers to a Fenton sludge resource recovery and on-site recycling device. Background Art

[0002] As an advanced oxidation technology in the sewage treatment industry, the Fenton process has the advantages of low investment, wide application range, and significant treatment effect. Therefore, this process is widely used in the pretreatment process of difficult-to-biodegrade wastewater treatment generated by industries such as petroleum, pharmaceuticals, coking, and fine chemicals. It can effectively improve the biodegradability of wastewater and lay the foundation for subsequent biological treatment processes. The disadvantage of this process is that a large amount of iron sludge will be generated in daily treatment work. Due to the complex water quality of industrial enterprises' drainage, most of the sludge generated by industrial enterprises will be identified as hazardous waste, so the cost of disposing of the sludge is high, which brings a burden to the operation of the enterprise.

[0003] Therefore, the sludge problem generated by the Fenton process has become the main bottleneck restricting the further application of this process. The industry is in urgent need of a low-cost and effective sludge disposal solution. Utility Model Content

[0004] The technical problems to be solved by the utility model are:

[0005] The existing Fenton sludge disposal costs are high and easily cause environmental pollution.

[0006] In order to solve the above technical problems, the technical solution proposed in the utility model is: a Fenton sludge resource on-site reuse device, including a skid-mounted shell, in which a feed pump, an acid adjustment reaction tank, a sedimentation tank, an electric redox tank and a discharge pump are arranged, the feed pump and the acid adjustment reaction tank are connected by pipe fittings, the acid adjustment reaction tank and the sedimentation tank are connected by pipe fittings, the electric redox tank and the sedimentation tank are connected by pipe fittings, the discharge pump and the electric redox tank are connected by pipe fittings, and a mud discharge port and an axial flow fan are arranged on the top of the skid-mounted shell.

[0007] In order to fully react, a reaction agitator is provided in the acid adjustment reaction tank, an acid medicine tank is provided on one side of the acid adjustment reaction tank, the acid medicine tank and the acid adjustment reaction tank are connected by an acid dosing pump and pipe fittings, and a solvent agitator is provided on the acid medicine tank.

[0008] Furthermore, a feed port and a discharge port are respectively provided on both sides of the skid-mounted shell, the feed port is connected to a feed pump, and the discharge port is connected to a discharge pump.

[0009] In order to conveniently discharge the sludge produced by the reaction from the system, a sludge discharge pump is provided at the bottom of the sedimentation tank, and the sludge discharge pump is connected to the sludge discharge port pipe fitting.

[0010] In order to carry out redox reaction, the electric redox cell includes a cell body, a DC power supply, an anode and a cathode. The cell body is connected to the sedimentation tank pipe. The anode and cathode are arranged in a staggered array in the cell body. The anode and cathode are connected to the DC power supply.

[0011] Furthermore, the distance between the anode and the cathode is 1.5-3 cm.

[0012] Furthermore, the anode is made of a titanium base with a SnO2 intermediate layer plated thereon and then a PbO2 catalyst layer plated thereon, and the cathode is made of one of titanium, stainless steel or steel plate.

[0013] Furthermore, a support is provided at the bottom of the acid adjustment reaction tank.

[0014] The beneficial effects achieved by the utility model using the above structure are as follows:

[0015] 1. According to the effluent conditions of the Fenton process, by controlling the flow rate of the feed pump, the full or partial recovery and reuse of the Fenton sludge can be achieved to ensure the Fenton treatment effect.

[0016] 2. This device can reduce the amount of iron salt added in the Fenton process and reduce the cost of sewage treatment.

[0017] 3. This device can realize resource utilization of Fenton sludge, reduce the cost of Fenton process sludge treatment, and reduce the burden on enterprises.

[0018] 4. This device realizes on-site reuse of Fenton sludge, reducing the risks to the environment caused by incineration and landfill disposal of Fenton sludge. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a schematic diagram of the overall structure of a Fenton sludge resource on-site reuse device proposed by the utility model.

[0020] Among them, 1. skid-mounted shell, 2. feed pump, 3. acid adjustment reaction tank, 4. sedimentation tank, 5. electric redox tank, 6. discharge pump, 7. feed port, 8. discharge port, 9. acid tank, 10. solvent agitator, 11. acid dosing pump, 12. reaction agitator, 13. mud pump, 14. mud port, 15. axial flow fan, 16. DC power supply, 17. anode, 18. cathode, 19. bracket.

[0021] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. They are used together with the embodiments of the present invention to explain the present invention and do not constitute a limitation to the present invention. DETAILED DESCRIPTION

[0022] The technical solutions in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all of the embodiments; based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the utility model.

[0023] like Figure 1 As shown, the utility model proposes a Fenton sludge resource on-site reuse device, including a skid-mounted shell 1, a feed port 7 and a discharge port 8 are arranged at the lower part of the skid-mounted shell 1, and a mud discharge port 14 and an axial flow fan 15 are arranged at the top of the skid-mounted shell 1; a feed pump 2, an acid adjustment reaction tank 3, a sedimentation tank 4, an electric redox tank 5 and a discharge pump 6 are arranged in the skid-mounted shell 1, and the electric redox tank at least includes a tank body, a DC power supply 16, an anode 17 and a cathode 18, a reaction agitator 12 is arranged on the acid adjustment reaction tank 3, the required acid is pumped into the acid drug tank 9 by an acid dosing pump 11, and a solvent agitator 10 is arranged on the acid drug tank 9, a sludge pump 13 is arranged at the bottom of the sedimentation tank, and the sludge is discharged from the system through a pipeline, and the discharge pump 6 pumps the redox solution out of the system through a pipeline.

[0024] The feed pump 2 directly sucks the sludge produced by the Fenton process, and the flow rate is controlled at 5%-30% of the Fenton treated water volume. The anode 17 in the electric redox tank 5 is plated with a SnO2 intermediate layer on a titanium base and then plated with a PbO2 catalyst layer having a catalytic oxidation effect. The cathode 18 is made of titanium, stainless steel or steel plates. The plate spacing is 1.5-3cm, and the plate current density is 5-20A / dm2.

[0025] During specific use, the sludge produced by the Fenton process is pumped into the acid adjustment reaction tank 3 through the feed pump 2. Under the stirring of the reaction agitator 12, the hydroxide in the sludge fully reacts with the acid and dissolves, and then is discharged into the sedimentation tank 4 to remove the undissolved suspended matter in the water. The effluent from the sedimentation tank 4 is discharged into the electric redox tank 5 for redox reaction. The organic matter in the water is oxidized into inorganic matter at the anode 17, and the Fe3+ in the water is reduced to Fe2+ at the cathode 18. Finally, the generated Fe2+ is transported back to the ferrous dosing process in the Fenton process through the discharge pump 6.

[0026] A chemical plant discharges 240m3 of difficult-to-biodegrade wastewater every day. 3 The COD in water is 5000mg / L and the Fenton process is used for pretreatment. The Fenton effluent COD is 2000mg / L.

[0027] Comparative Example:

[0028] The process produces 3024 kg of sludge with a moisture content of 80% per day, and the daily sludge treatment cost is 10,584 yuan.

[0029] Example:

[0030] The above process is modified to add the Fenton sludge resource recovery and on-site recycling device. The feed port 7 is connected to the bottom of the Fenton sedimentation tank by a pipeline, the discharge port 8 is connected to the ferrous dosing pipeline, and the sludge discharge port 14 is connected to the Fenton sludge tank. The sludge generated by the Fenton process is pumped into the acid adjustment reaction tank 3 through the feed pump 2, and the flow rate is controlled at 1.5m 3 / h, under the stirring of the reaction stirrer 12, the pH of the pool water is controlled at about 4, the hydroxide in the sludge reacts with the acid to dissolve fully and then is discharged into the sedimentation tank 4 to remove the undissolved suspended matter in the water, and the effluent of the sedimentation tank 4 is discharged into the electric oxidation-reduction tank 5 for oxidation-reduction reaction, the organic matter in the water is oxidized into inorganic matter at the anode 17, and the Fe 3+ At the cathode 18, it is reduced to Fe 2+ Finally, the generated Fe 2+ The ferrous sulfate is transported back to the Fenton process dosing pipeline. The DC power supply has an operating power of 35kw, the total operating power of the device is 40kw, and it consumes 35kg of sulfuric acid per hour, which can save 36kg of ferrous sulfate per hour. The operating cost of the device for sludge treatment is 556.8 yuan per day, which greatly reduces the cost of sludge disposal.

[0031] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0032] Although the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

[0033] The above description of the utility model and its implementation methods is not restrictive. The drawings show only one implementation method of the utility model, and the actual structure is not limited thereto. In short, if ordinary technicians in this field are inspired by it and design structural methods and embodiments similar to the technical solution without creativity without departing from the purpose of the invention of the utility model, they should all fall within the protection scope of the utility model.

Claims

1. A Fenton sludge resource on-site recycling device, characterized by: The invention comprises a skid-mounted shell (1), wherein a feed pump (2), an acid adjustment reaction tank (3), a sedimentation tank (4), an electric oxidation-reduction tank (5) and a discharge pump (6) are arranged in the skid-mounted shell (1), wherein the feed pump (2) and the acid adjustment reaction tank (3) are connected by a pipe fitting, the acid adjustment reaction tank (3) and the sedimentation tank (4) are connected by a pipe fitting, the electric oxidation-reduction tank (5) and the sedimentation tank (4) are connected by a pipe fitting, and the discharge pump (6) and the electric oxidation-reduction tank (5) are connected by a pipe fitting. A mud discharge port (14) and an axial flow fan (15) are arranged on the top of the skid-mounted shell (1).

2. A Fenton sludge resource on-site recycling device according to claim 1, characterized in that: A reaction stirrer (12) is provided in the acid adjustment reaction tank (3), an acid medicine tank (9) is provided on one side of the acid adjustment reaction tank (3), the acid medicine tank (9) and the acid adjustment reaction tank (3) are connected via an acid dosing pump (11) and pipe fittings, and a solvent stirrer (10) is provided on the acid medicine tank (9).

3. A Fenton sludge resource on-site recycling device according to claim 1, characterized in that: A feed port (7) and a discharge port (8) are respectively provided on both sides of the skid-mounted housing (1); the feed port (7) is connected to a feed pump (2), and the discharge port (8) is connected to a discharge pump (6).

4. A Fenton sludge resource on-site recycling device according to claim 1, characterized in that: A mud discharge pump (13) is provided at the bottom of the sedimentation tank (4), and the mud discharge pump (13) is connected to a mud discharge port (14) by a pipe fitting.

5. The Fenton sludge resource on-site recycling device according to claim 1 is characterized by: The electric redox tank (5) comprises a tank body, a DC power supply (16), an anode (17) and a cathode (18); the tank body is connected to a settling tank (4) pipe; the anode (17) and the cathode (18) are arranged in a staggered array in the tank body; and the anode (17) and the cathode (18) are connected to the DC power supply (16).

6. A Fenton sludge resource recovery and on-site recycling device according to claim 5, characterized in that: The distance between the anode (17) and the cathode (18) is 1.5-3 cm.

7. A Fenton sludge resource on-site recycling device according to claim 6, characterized in that: The anode (17) is made of a titanium base with a SnO2 intermediate layer plated thereon and then a PbO2 catalyst layer plated thereon, and the cathode (18) is made of one of titanium, stainless steel or steel plate.

8. The Fenton sludge resource recovery and on-site recycling device according to claim 1 is characterized by: A support (19) is provided at the bottom of the acid adjustment reaction tank (3).

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