Nano iron-carbon micro-electrolysis and Fenton oxidation integrated reactor

Abstract

The utility model discloses a nano-iron carbon micro-electrolysis and Fenton oxidation integrated reactor, which comprises a nano-iron micro-electrolysis tank, a Fenton oxidation tank, a neutralizing tank, a degassing tank, a coagulating tank, a flocculation tank and a sedimentation tank which are sequentially connected through internal pipelines, the nano-iron micro-electrolysis tank is connected with a water inlet pipe, and the sedimentation tank is connected with a water outlet pipe and a sludge discharge pipe; sewage sequentially passes through the nano-iron micro-electrolysis tank, the Fenton oxidation tank, the neutralization tank, the degassing tank, the coagulation tank, the flocculation tank and the sedimentation tank in a step-by-step self-flowing manner; aeration devices are respectively arranged in the nano-iron micro-electrolysis tank, the Fenton oxidation tank, the neutralization tank, the degassing tank, the coagulation tank and the flocculation tank, the aeration devices are liftable aeration devices, and the aeration devices are connected with an external air source through aeration pipelines. The utility model relates to a nano iron-carbon micro-electrolysis Fenton oxidation integrated reactor, which is integrated equipment, and solves the problems of larger occupied area and higher investment caused by the fact that traditional Fenton and micro-electrolysis water treatment are generally divided into more functional monomers.

Description

Technical Field

[0001] The utility model belongs to the technical field of water treatment, and particularly relates to a nano iron-carbon micro-electrolysis Fenton oxidation integrated reactor. Background Art

[0002] Chemical and pharmaceutical wastewater usually has the characteristics of high concentration, complex composition, high toxicity, and poor biodegradability. Therefore, chemical wastewater is one of the most difficult types of wastewater to treat in the field of wastewater treatment. At present, the technologies used more in chemical and pharmaceutical wastewater treatment are mainly physicochemical and biochemical methods. The commonly used physicochemical methods are Fenton and micro-electrolysis. Fenton oxidation water treatment equipment mainly reacts with refractory organic matter by adding alkali, hydrogen peroxide, ferrous sulfate, sulfuric acid, PAM and other agents to generate organic free radicals, destroy their structure, and finally oxidize and decompose, which can effectively remove organic matter, reduce COD, and decolorize wastewater. Iron-carbon micro-electrolysis mainly uses the chemical reaction of micro-primary cells between iron and carbon, and the highly active [H] undergoes redox reactions with organic matter in wastewater.

[0003] Fenton oxidation and micro-electrolysis water treatment are divided into many functional areas, and many structures take up a lot of installation time and occupy a large area. In addition, the investment and construction costs are too high, and the energy consumption and operation and maintenance costs are high, which greatly increases the cost of sewage treatment for enterprises. With the progress of society and the increase in environmental protection efforts, all sectors of society are paying more attention to environmental protection. For severe sewage, effective methods must be adopted to treat it so that it meets the national sewage discharge standards. Summary of the invention

[0004] The utility model aims to provide a nano iron-carbon micro-electrolysis Fenton oxidation integrated reactor, which is an integrated device that solves the problem of large footprint and high investment caused by the traditional Fenton and micro-electrolysis water treatments being generally divided into more functional monomers.

[0005] To achieve the above-mentioned purpose, the technical solution of the utility model is to design a nano-iron-carbon micro-electrolysis Fenton oxidation integrated reactor, comprising a nano-iron micro-electrolysis cell, a Fenton oxidation cell, a neutralization cell, a degassing cell, a coagulation cell, a flocculation cell and a sedimentation cell connected in sequence through internal pipelines, wherein the nano-iron micro-electrolysis cell is connected to a water inlet pipe, and the sedimentation cell is connected to a water outlet pipe and a mud discharge pipe; sewage is discharged by gravity step by step through the nano-iron micro-electrolysis cell, the Fenton oxidation cell, the neutralization cell, the degassing cell, the coagulation cell, the flocculation cell and the sedimentation cell;

[0006] The nano-iron micro-electrolysis cell, Fenton oxidation tank, neutralization tank, degassing tank, coagulation tank and flocculation tank are respectively provided with an aeration device, the aeration device is a liftable aeration device, and the aeration device is connected to an external air source through an aeration pipeline.

[0007] Preferably, the nano-iron micro-electrolysis cell is provided with iron-carbon filler.

[0008] Preferably, the Fenton oxidation tank is connected to a circulation pipeline.

[0009] Preferably, a sludge return pipeline is connected between the sedimentation tank and the coagulation tank.

[0010] Preferably, an inclined tube filler is provided in the sedimentation tank.

[0011] Preferably, the nano-iron-carbon micro-electrolysis Fenton oxidation integrated reactor also includes an online pH meter, a liquid alkali dosing device, an acid dosing device, a hydrogen peroxide dosing device and a PAM dosing device.

[0012] Preferably, the nano-iron-carbon micro-electrolysis Fenton oxidation integrated reactor is made of corrosion-resistant PP thickened plate as a whole, and a steel structure frame is provided around the nano-iron-carbon micro-electrolysis Fenton oxidation integrated reactor.

[0013] The advantages and beneficial effects of the utility model are: providing a nano iron-carbon micro-electrolysis Fenton oxidation integrated reactor, which is an integrated device, solves the problem that the traditional Fenton and micro-electrolysis water treatments are generally divided into more functional monomers, resulting in a large footprint and high investment. At the same time, it solves the problem that the traditional chemical wastewater treatment process is not ideal for removing organic pollutants with high concentrations, complex components, and high toxicity, resulting in COD, total nitrogen and chromaticity in the effluent not meeting the standards, and is particularly effective for the treatment of complex polycyclic and heterocyclic organic matter in sewage and toxic, harmful and poorly biodegradable substances. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a top plan view of a nano-iron-carbon micro-electrolysis Fenton oxidation integrated reactor of the utility model.

[0015] Figure 2 It is a bottom plan view of a nano-iron-carbon micro-electrolysis Fenton oxidation integrated reactor of the utility model.

[0016] Figure 3 yes Figure 1 , Figure 2 AA cross-section diagram.

[0017] Figure 4 yes Figure 1 , Figure 2 BB cross-section diagram. DETAILED DESCRIPTION

[0018] The following is a further description of the specific implementation of the present invention in conjunction with the accompanying drawings and embodiments. The following embodiments are only used to more clearly illustrate the technical solution of the present invention, and cannot be used to limit the protection scope of the present invention.

[0019] The technical solution specifically implemented in this utility model is:

[0020] like Figures 1 to 4 As shown, a nano-iron-carbon micro-electrolysis Fenton oxidation integrated reactor comprises a nano-iron micro-electrolysis cell 1, a Fenton oxidation cell 2, a neutralization cell 3, a degassing cell 4, a coagulation cell 5, a flocculation cell 6 and a sedimentation cell 7 which are sequentially connected through internal pipelines, wherein the nano-iron micro-electrolysis cell 1 is connected to a water inlet pipe 8, and the sedimentation cell 7 is connected to a water outlet pipe 9 and a mud discharge pipe 10; sewage flows through the nano-iron micro-electrolysis cell 1, the Fenton oxidation cell 2, the neutralization cell 3, the degassing cell 4, the coagulation cell 5, the flocculation cell 6 and the sedimentation cell 7 in a step-by-step gravity manner, and the whole system automatically inlets water and continuously discharges water;

[0021] The nano-iron micro-electrolysis cell 1, Fenton oxidation tank 2, neutralization tank 3, degassing tank 4, coagulation tank 5 and flocculation tank 6 are respectively provided with an aeration device 11, and the aeration device 11 is connected to an external air source through an aeration pipeline. The aeration device accelerates stirring and mixing and improves the reaction rate. Due to the large number of functional areas, aeration stirring is more flexible than traditional mechanical stirring and saves energy. In addition, the aeration device 11 is a liftable aeration device, which is easy to replace and maintain without affecting the normal operation of the equipment.

[0022] Furthermore, the nano-iron micro-electrolysis cell 1 is provided with iron-carbon filler.

[0023] Furthermore, the Fenton oxidation tank 2 is connected to a circulation pipeline 12. By adopting the above solution, the sewage is returned to the front end area of ​​the Fenton oxidation tank 2, which is conducive to improving the treatment effect.

[0024] Furthermore, a sludge return pipeline 13 is connected between the sedimentation tank 7 and the coagulation tank 5. By adopting the above scheme, 5%-20% of the sludge in the sedimentation tank 7 is returned to the front coagulation tank 5, and the concentration of the sludge in the reaction zone is increased, thereby improving the sedimentation efficiency, reducing the amount of sludge generated, reducing the consumption of chemical agents in the bottom mud, and saving the amount and cost of chemical agents.

[0025] Furthermore, an inclined tube filler is provided in the sedimentation tank 7. By adopting the above scheme, the sedimentation effect is improved.

[0026] Furthermore, the nano-iron-carbon micro-electrolysis Fenton oxidation integrated reactor also includes an online pH meter 14, a liquid alkali dosing device, an acid dosing device, a hydrogen peroxide dosing device and a PAM dosing device. Among them, an acid dosing device is arranged on the water inlet pipe 8 connected to the nano-iron micro-electrolysis cell 1, and the acid dosing device is connected to the water inlet pipe 8 through a pipeline mixer 15. The water outlet of the nano-iron micro-electrolysis cell 1 is arranged on the upper part of the nano-iron-carbon micro-electrolysis cell 1, and the mixed dosing of nano-iron powder and powdered activated carbon is arranged on the top of the reactor. There is no aeration near the water outlet position. The upper part of this area is the water outlet clarification area, which is connected to the Fenton oxidation tank 2 through a pipeline, and the hydrogen peroxide dosing device is arranged at the entrance of the pipeline.

[0027] Furthermore, the nano-iron-carbon micro-electrolysis Fenton oxidation integrated reactor is made of corrosion-resistant PP thickened plate as a whole, and the nano-iron-carbon micro-electrolysis Fenton oxidation integrated reactor is reinforced with a steel structure frame on the periphery to ensure its structural safety.

[0028] When the utility model is used, a nano-iron-carbon micro-electrolysis Fenton oxidation integrated reactor: the sewage entering the reactor must be pre-adjusted for pH so that its pH is controlled at 3.0-4.0, generally by adding acid to the water inlet pipe 8, and then sent to the nano-iron-carbon micro-electrolysis cell 1 and the Fenton oxidation cell 2 for oxidation treatment by a lifting water pump or a liquid level difference through the water inlet pipe 8 and the pipeline mixer 15; the nano-iron-carbon micro-electrolysis cell 1 is generally divided into multiple grids, and nano-iron-carbon powder is regularly added therein for micro-electrolysis reaction, and some heterocyclic organic matter and color in the sewage are removed through the redox action of hydroxyl groups generated by micro-electrolysis. Aeration can be lifted in the pool for stirring. There is no aeration in the outlet area, and it flows into the Fenton oxidation cell 2 through the top outlet by gravity. The hydrogen peroxide addition point is located at the outlet of the nano-iron-carbon micro-electrolysis cell 1. At the same time, the Fe generated by micro-electrolysis is utilized 2+The strong oxidizing property of Fenton reagent formed with hydrogen peroxide added to sewage opens the ring and breaks the chain of the difficult-to-degrade polycyclic and heterocyclic organic matter and toxic and harmful substances in sewage into small molecular substances that are easily absorbed and degraded by microorganisms in Fenton oxidation tank 2. Fenton oxidation tank 2 is equipped with aeration, and an air stripping device is set in the water outlet area to return water to the front end area of ​​Fenton oxidation tank 2, which serves as a circulation system to facilitate the uniformity of the entire system. Since the overflow water after nano-iron micro-electrolysis and Fenton oxidation treatment is highly acidic and needs to be neutralized, liquid alkali is added to the outlet of Fenton oxidation tank 2, and neutralization tank 3 can increase aeration to accelerate the neutralization reaction. The pH of neutralization tank 3 is controlled at 8-9. After neutralization by adding liquid alkali, the treated water enters the coagulation tank 5 and the flocculation tank 6 in turn, and flocculation is carried out by adding PAM to generate floccules and treated sewage, which are discharged into the sedimentation tank 7 to promote the flocculation and precipitation of colloids such as Fe(0H)3 generated in the acid-base neutralization process through the sedimentation tank 7. The supernatant after precipitation is discharged from the top outlet tank, and the precipitated sludge is discharged from the sludge discharge pipe 10 for dehydration treatment. Part of the sludge is returned to the coagulation tank 5 through the air lift device and the sludge return pipeline 13.

[0029] The nano-iron-carbon micro-electrolysis cell 1 and the neutralization cell 3 are provided with an online pH meter 14, and the monitoring signal is fed back to the acid and liquid alkali dosing device through the online pH meter 14, and the automatic control program automatically and accurately adds acid to the inlet pipe mixer 15 and adds liquid alkali to the Fenton outlet according to the monitored pH value, so as to achieve the program adjustment of the pH value to 3-4 and the neutralization 8-9. The amount of hydrogen peroxide added, the Fenton oxidation circulation amount and the sludge return amount are accurately controlled by the automatic control program according to the inlet flow rate.

[0030] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principle of the present invention. These improvements and modifications should also be regarded as the protection scope of the present invention.

Claims

1. A nano-iron-carbon micro-electrolysis Fenton oxidation integrated reactor, characterized in that: It includes a nano-iron micro-electrolysis cell, a Fenton oxidation cell, a neutralization cell, a degassing cell, a coagulation cell, a flocculation cell and a sedimentation cell which are sequentially connected through internal pipelines, wherein the nano-iron micro-electrolysis cell is connected with a water inlet pipe, and the sedimentation cell is connected with a water outlet pipe and a mud discharge pipe; sewage flows through the nano-iron micro-electrolysis cell, the Fenton oxidation cell, the neutralization cell, the degassing cell, the coagulation cell, the flocculation cell and the sedimentation cell in sequence in a step-by-step gravity manner; The nano-iron micro-electrolysis cell, Fenton oxidation tank, neutralization tank, degassing tank, coagulation tank and flocculation tank are respectively provided with an aeration device, the aeration device is a liftable aeration device, and the aeration device is connected to an external air source through an aeration pipeline.

2. The nano-iron-carbon micro-electrolysis Fenton oxidation integrated reactor according to claim 1, characterized in that: The nano-iron micro-electrolysis cell is provided with iron-carbon filler.

3. The nano-iron-carbon micro-electrolysis Fenton oxidation integrated reactor according to claim 1, characterized in that: The Fenton oxidation tank is connected with a circulation pipeline.

4. The nano-iron-carbon micro-electrolysis Fenton oxidation integrated reactor according to claim 1, characterized in that: A sludge return pipeline is connected between the sedimentation tank and the coagulation tank.

5. The nano-iron-carbon micro-electrolysis Fenton oxidation integrated reactor according to claim 1, characterized in that: An inclined tube filler is arranged in the sedimentation tank.

6. The nano-iron-carbon micro-electrolysis Fenton oxidation integrated reactor according to claim 1, characterized in that: The nano-iron-carbon micro-electrolysis Fenton oxidation integrated reactor also includes an online pH meter, a liquid alkali dosing device, an acid dosing device, a hydrogen peroxide dosing device and a PAM dosing device.

7. The nano-iron-carbon micro-electrolysis Fenton oxidation integrated reactor according to claim 1, characterized in that: The nano-iron-carbon micro-electrolysis Fenton oxidation integrated reactor is made of corrosion-resistant PP thickened plates as a whole, and a steel structure frame is arranged on the periphery of the nano-iron-carbon micro-electrolysis Fenton oxidation integrated reactor.

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