A method and system for treating rubber sewage based on fenton reaction

Abstract

The application discloses a rubber sewage treatment method and system based on a Fenton reaction, and the treatment method comprises the following steps: hydroxyl radicals generated by the Fenton reaction are used as a polymerization initiator, and an adsorbent is used as a polymerization core; under the action of the polymerization initiator, the adsorbent adsorbs rubber molecules in sewage; meanwhile, the rubber molecules are self-polymerized on the adsorbent to form rubber macromolecules; after the adsorption self-polymerization reaction, solid-liquid separation is performed on the mixed solution, and the adsorbent and the grafted rubber macromolecules adsorbed thereon are separated out, so that the rubber molecules in the sewage are removed. The application is energy-saving and environment-friendly, and can effectively remove the rubber molecules in the sewage.

Description

Technical Field

[0001] This invention relates to the field of wastewater treatment technology, and in particular to a method and system for treating rubber wastewater based on the Fenton reaction. Background Technology

[0002] The rapid development of the automotive industry has led to a growing global demand for rubber. As a primary raw material for automobile tires, the demand for synthetic rubber, including butadiene rubber, styrene-butadiene rubber, and various specialty rubbers, has seen rapid growth in recent years. In addition, rubber is widely used in defense, agriculture, water conservancy, and healthcare. Summary of the Invention

[0003] The purpose of this invention is to address the technical deficiencies in the existing technology by providing a method for treating rubber wastewater based on the Fenton reaction.

[0004] In another aspect, the present invention provides a rubber wastewater treatment system based on the Fenton reaction.

[0005] The technical solution adopted to achieve the purpose of this invention is:

[0006] A method for treating rubber wastewater based on the Fenton reaction includes the following steps: hydroxyl radicals generated by the Fenton reaction are used as polymerization initiators, and an adsorbent is used as a polymerization nucleus. Under the action of the polymerization initiator, the adsorbent adsorbs rubber molecules in the wastewater. At the same time, the rubber molecules undergo self-polymerization on the adsorbent to form rubber macromolecules. After the adsorption-self-polymerization reaction, the mixture is subjected to solid-liquid separation, and the adsorbent and the rubber macromolecules grafted onto it are separated, thereby removing rubber molecules from the wastewater.

[0007] In the above technical solution, the clear liquid obtained after solid-liquid separation is further subjected to biochemical treatment to remove residual small molecules, and the resulting clear water is discharged.

[0008] In the above technical solution, the biochemical treatment includes anaerobic treatment and aerobic treatment in sequence.

[0009] Another aspect of the present invention provides a method for treating rubber wastewater based on the Fenton reaction, comprising the following steps:

[0010] Step 1: Add the adsorbent to the adsorption polymerization reactor;

[0011] Step 2: Wastewater containing rubber molecules is introduced into the adsorption polymerization reactor, and Fenton oxidation liquid is introduced at the same time to polymerize the self-polymerized macromolecular rubber and adsorb it onto the adsorbent.

[0012] Step 3: Pass the treated wastewater into a solid-liquid separator for filtration to obtain clear liquid and turbid liquid;

[0013] Step 4: Pass the turbid liquid into a filter press and filter to obtain a clear liquid and a filter cake;

[0014] Step 5: Pass the clear liquid obtained in steps 3 and 4 into a biological treatment device for biochemical treatment to obtain clear water.

[0015] In the above technical solution, a portion of the clean water obtained in step 5 is recycled into the Fenton reactor.

[0016] In the above technical solution, the adsorbent is activated carbon or adsorbed white mud.

[0017] In the above technical solution, the Fenton oxidation solution is prepared in a photo-Fenton or electro-Fenton reactor. The raw materials added to the photo-Fenton or electro-Fenton reactor are air, dilute sulfuric acid, and water, and the pH of the mixed solution in the photo-Fenton or electro-Fenton reactor is adjusted to 2-4.

[0018] In another aspect of the present invention, a rubber wastewater treatment system based on the Fenton reaction includes an adsorption polymerization reactor, a Fenton reactor, a solid-liquid separator, and a filter press. The adsorption polymerization reactor is provided with a wastewater inlet, an adsorbent feeding port, a Fenton oxidation liquid inlet, and a treated wastewater outlet. The Fenton oxidation liquid outlet of the Fenton reactor is connected to the Fenton oxidation liquid inlet via a pipeline. The treated wastewater outlet is connected to the feed port of the solid-liquid separator via a pipeline. The turbid liquid outlet of the solid-liquid separator is connected to the inlet of the filter press via a pipeline.

[0019] In the above technical solution, the treatment system further includes a biological treatment device, which includes an anaerobic tank and an aerobic tank. The clear liquid outlet of the solid-liquid separator and the filter press is connected to the anaerobic tank through a pipeline. The anaerobic tank is connected to the aerobic tank through a pipeline. A clear water discharge pipeline is connected to the aerobic tank.

[0020] In the above technical solution, the Fenton reactor is a photo-Fenton reactor or an electro-Fenton reactor;

[0021] The clean water discharge pipe is connected to the Fenton reactor via a circulation pipeline, and part of the clean water obtained after treatment in the aerobic tank is recycled back to the Fenton reactor for reuse.

[0022] Compared with the prior art, the beneficial effects of the present invention are:

[0023] 1. Traditional wastewater treatment methods containing rubber molecules involve oxidizing the rubber molecules to further break them down into smaller molecules before further treatment. This method is energy-intensive and introduces a large amount of oxidizing agents, which can cause secondary pollution to the environment. In contrast, this application promotes the polymerization of rubber molecules, allowing them to gradually polymerize into large molecules before further treatment, which is energy-saving and environmentally friendly.

[0024] 2. In this invention, the Fenton oxidation solution provides hydroxyl radicals, which act as initiators for rubber molecule polymerization. The adsorbent adsorbs and enriches rubber macromolecules, and under the action of hydroxyl radicals in the Fenton oxidation solution, the rubber molecules gradually polymerize. Then, filtration removes the polymer, effectively turning wastewater into clean water that meets discharge standards. Attached Figure Description

[0025] Figure 1 The diagram shown is a schematic diagram of the processing system in Example 2.

[0026] Figure 2 The diagram shown is a schematic diagram of the processing system in Example 3. Detailed Implementation

[0027] The present invention will be further described in detail below with reference to specific embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

[0028] Example 1

[0029] A method for treating rubber wastewater based on the Fenton reaction includes the following steps:

[0030] The hydroxyl radicals generated by the Fenton reaction act as polymerization initiators, and the adsorbent acts as polymerization nuclei. Under the action of the polymerization initiator, the adsorbent adsorbs rubber molecules in the wastewater. Simultaneously, on the adsorbent, the rubber molecules undergo self-polymerization to form rubber macromolecules. After the adsorption-self-polymerization reaction, the mixture is subjected to solid-liquid separation, and the adsorbent and the grafted rubber macromolecules adsorbed on it are separated, thereby removing rubber molecules from the wastewater. Then, the clarified liquid obtained after solid-liquid separation is subjected to biological treatment to obtain clean water for discharge. The biological treatment includes anaerobic treatment and aerobic treatment.

[0031] Example 2

[0032] A method for treating rubber wastewater based on the Fenton reaction includes the following steps:

[0033] Step 1: Add the adsorbent to the adsorption polymerization reactor at a rate of 0.57 kg / h;

[0034] Step 2: Wastewater containing rubber molecules with a COD of 557 mg / L is fed into the adsorption polymerization reactor at a rate of 106 kg / h, while Fenton oxidation liquid is simultaneously introduced to cause the rubber molecules to self-polymerize into macromolecular rubber and adsorb onto the adsorbent.

[0035] Step 3: Pass the treated wastewater into a solid-liquid separator for filtration to obtain clear liquid and turbid liquid;

[0036] Step 4: Pass the turbid liquid into a filter press and filter to obtain a clear liquid and a filter cake;

[0037] Step 5: The clear liquid obtained in steps 3 and 4 is sequentially passed into the anaerobic tank and the aerobic tank for biochemical treatment to obtain clear water with a COD content of 34 mg / L.

[0038] In step 5, a portion of the purified water is recycled into the Fenton reactor to reduce water consumption, thus saving energy and protecting the environment. The adsorbent is activated carbon or adsorbent sludge, which adsorbs and enriches rubber macromolecules. The Fenton oxidation process is carried out in a photo-Fenton or electro-Fenton reactor, in which air and dilute sulfuric acid are introduced to control the pH of the reactor to 2-4.

[0039] Example 2

[0040] A processing system based on the processing method of Embodiment 1, such as Figure 1 As shown, the apparatus includes an adsorption polymerization reactor, a Fenton reactor, a solid-liquid separator, and a filter press. The adsorption polymerization reactor is provided with a wastewater inlet, an adsorbent feeding port, a Fenton oxidation liquid inlet, and a treated wastewater outlet. The Fenton oxidation liquid outlet of the Fenton reactor is connected to the Fenton oxidation liquid inlet via a pipeline. The treated wastewater outlet is connected to the feed port of the solid-liquid separator via a pipeline. The turbid liquid outlet of the solid-liquid separator is connected to the inlet of the filter press via a pipeline.

[0041] The Fenton reactor is either a photo-Fenton reactor or an electro-Fenton reactor.

[0042] In operation, the adsorbent is added to the adsorption polymerization reactor, which continuously feeds in wastewater. Then, Fenton oxidation solution is introduced, where it provides hydroxyl radicals, which act as initiators for rubber molecules. The adsorbent adsorbs and enriches rubber macromolecules. Under the influence of hydroxyl radicals in the Fenton oxidation solution, the macromolecules gradually polymerize and attach to the adsorbent. After the adsorption polymerization reaction, the mixture is filtered through a solid-liquid separator. The clear liquid is water with macromolecules removed, containing only small organic molecules. The turbid liquid is compressed in a filter press to obtain a filter cake.

[0043] To remove small molecule organic matter from the supernatant in Example 1, such as Figure 2 As shown, the treatment system also includes a biological treatment device, which includes an anaerobic tank and an aerobic tank. The clear liquid outlet of the solid-liquid separator and the filter press is connected to the anaerobic tank through a pipeline. The anaerobic tank is connected to the aerobic tank through a pipeline. The aerobic tank is equipped with a clear water discharge pipeline.

[0044] To conserve groundwater resources, the clean water discharge pipe is connected to the Fenton reactor, and the clean water obtained from the aerobic tank is recycled back to the Fenton reactor for reuse.

[0045] The above description is only a preferred embodiment of the present invention. It should be noted that, for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A method for treating rubber wastewater based on the Fenton reaction, characterized in that, Includes the following steps: The hydroxyl radicals generated by the Fenton reaction serve as polymerization initiators, and the adsorbent serves as the polymerization nucleus. Under the action of the polymerization initiator, the adsorbent adsorbs rubber molecules in the wastewater. At the same time, the rubber molecules undergo self-polymerization on the adsorbent to form rubber macromolecules. After the adsorption-self-polymerization reaction, the mixture is subjected to solid-liquid separation, and the adsorbent and the rubber macromolecules grafted onto it are separated, thereby removing rubber molecules from the wastewater. The clear liquid obtained after solid-liquid separation is further subjected to biochemical treatment to remove residual small molecules, and the resulting clear water is discharged. The biochemical treatment includes anaerobic treatment and aerobic treatment in sequence; Specifically, the following steps are included: Step 1: Add the adsorbent to the adsorption polymerization reactor; Step 2: Wastewater containing rubber molecules is introduced into the adsorption polymerization reactor, and Fenton oxidation liquid is introduced at the same time to polymerize the self-polymerized macromolecular rubber and adsorb it onto the adsorbent. Step 3: Pass the treated wastewater into a solid-liquid separator for filtration to obtain clear liquid and turbid liquid; Step 4: Pass the turbid liquid into a filter press and filter to obtain a clear liquid and a filter cake; Step 5: Pass the clear liquid obtained in steps 3 and 4 into a biological treatment device for biochemical treatment to obtain clear water.

2. The processing method as described in claim 1, characterized in that, A portion of the purified water obtained in step 5 is recycled into the Fenton reactor.

3. The processing method as described in claim 1, characterized in that, The adsorbent is activated carbon or adsorbent sludge.

4. The processing method as described in claim 1, characterized in that, The Fenton oxidation solution is prepared in a photo-Fenton or electro-Fenton reactor. The raw materials added to the photo-Fenton or electro-Fenton reactor are air, dilute sulfuric acid, and water, and the pH of the mixture in the photo-Fenton or electro-Fenton reactor is adjusted to 2-4.

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