Catalytic oxidation purification device and method for high-chlorine degradation-resistant wastewater

A technology of catalytic oxidation and purification device, which is applied in chemical instruments and methods, oxidized water/sewage treatment, water pollutants, etc. The effect of avoiding problems, reducing the production of iron sludge, stable and convenient operation

Pending Publication Date: 2021-06-22
HARBIN INST OF TECH SHENZHEN GRADUATE SCHOOL
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Problems solved by technology

When Fenton technology treats high-chlorine refractory wastewater, due to the presence of chloride ions, most of the OH is converted into Cl, and then Cl is converted into dichloride anion radicals (Cl 2 - ), ·Cl and ·Cl 2 - The oxidation ability is lower than OH, which leads to the obstruction of the Fenton oxidation process and the difficulty in the oxidation and mineralization of organic matter.
Through Fenton-like or other catalytic oxidation processes, increasing the pH of the reaction process or performing the Fenton reaction process under neutral conditions is expected to reduce the generation of Cl, but the problem is that the oxidation ability of OH is related to pH, and the higher the pH , The lower the oxidation ability of OH, which leads to the unsatisfactory or even basically ineffective ability to oxidize and mineralize refractory organic matter
[0010] In addition, the use of Fenton technology also has problems such as large consumption of chemicals, difficult separation of cement water, and difficulty in iron sludge treatment and disposal.
First of all, when using Fenton technology to directly oxidize and promote the mineralization of refractory pollutants, there are often problems such as excessive use of oxidants and catalysts and high cost of chemicals; at the same time, there are organic pollutants in the process of applying aromatics and other organic substances to the Fenton technology. Aggregation, deep color of effluent, inability to separate mud and water, etc.; in addition, a large amount of iron sludge discharge is often required in the traditional Fenton process, and the iron sludge discharged after refractory wastewater Fenton treatment is due to the presence of more intermediate metabolism with incomplete oxidation As a result, iron sludge needs to be disposed of as hazardous waste, and the cost of hazardous waste treatment for iron sludge is as high as 2800-8000 yuan / t, which is too high

Method used

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  • Catalytic oxidation purification device and method for high-chlorine degradation-resistant wastewater
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  • Catalytic oxidation purification device and method for high-chlorine degradation-resistant wastewater

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preparation example Construction

[0052] In the preparation process of the catalyst, the particle size of the catalyst is set between 120-800 mesh. On the one hand, the catalytic activity must be considered, and on the other hand, the stability of the catalyst must be considered.

[0053] Depending on the water quality and the amount of hydrogen peroxide added, the consumption of the catalyst will also be different. According to the difference in the consumption of the catalyst, it is necessary to replenish the catalyst in real time to keep it at a stable reaction level.

[0054] (2) Properly add hydrogen peroxide in the main reaction zone to make the catalyst react well with hydrogen peroxide to produce a sufficient amount of hydroxyl radicals, and simultaneously according to the follow-up treatment ( figure 2 ) section and effluent water quality to adjust the addition of hydrogen peroxide, control the TOC removal rate below 50% when the reactor is connected to the biochemical treatment section, and control t...

Embodiment 1

[0061] The influent of a sewage treatment plant in an industrial park in Hunan is mainly composed of pyridine and chlorinated pyridine compounds, the influent chloride ion is 3000-5000mg / L, the COD is between 200-300mg / L, and the influent TOC is between 100-170mg / L , the influent ammonia nitrogen is 20mg / L, and the total nitrogen is about 25mg / L. The Fenton-hydrolytic acidification-oxidation ditch coupling process was used for treatment. During the treatment process, due to the interference of chloride ions on the Fenton process, the Fenton effluent before and after COD, TOC, etc. have basically no obvious changes, and increasing the dosage of hydrogen peroxide still cannot achieve a good removal of COD ( image 3 ), because chloropyridines cannot be removed by Fenton technology, and chloropyridines have a strong inhibitory effect on nitrifying bacteria, resulting in the obstruction of the ammonia oxidation process in the biochemical section and the limitation of the denitrific...

Embodiment 2

[0065] The influent of a sewage treatment station of a pesticide enterprise in Jiangsu is high-chlorine refractory wastewater, and the influent contains chlorinated organics such as dimethomorph, imidacloprid, thiazolone, pyridines, and thiazoles, and the influent COD8000-15000mg / L, chloride ions 4000-6000mg / L, the sewage treatment station mainly adopts Fenton pretreatment-anaerobic-aerobic process for treatment. Due to the interference of chloride ions, the effect of Fenton treatment is not obvious, and at the same time, the output of iron sludge is large, and the cost of disposal as hazardous waste is high. In order to temporarily ensure the normal progress of part of the production process, some chlorinated organic compounds and pyridine organic compounds are processed through incineration, which is too costly and the production capacity of enterprises is limited by the treatment of high-salt and refractory wastewater.

[0066] After adopting the catalytic oxidation technol...

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Abstract

The invention belongs to the technical field of wastewater purification, and particularly relates to a catalytic oxidation purification device and method for high-chlorine degradation-resistant wastewater. The device comprises a pH adjusting area, a main reaction area, a catalyst storage tank, a catalyst supplementing pipe, a pH callback flocculation area, a catalyst recycling pool and a catalyst backflow pipeline. The treatment method comprises the following steps: adding hydrogen peroxide into water to be treated to be acidic in the pH adjusting area, mixing the catalyst with the added hydrogen peroxide to react, adjusting the water to be slightly alkaline, carrying out self-flocculation and recovery on the catalyst, separating the catalyst from the treated water, and refluxing to the pH adjusting area to realize reuse. The method effectively realizes treatment of high-chlorine degradation-resistant wastewater, has the advantages of high removal efficiency, low operation cost, convenience in management and the like, and has a wide application prospect.

Description

technical field [0001] The invention belongs to the technical field of wastewater purification, and in particular relates to a catalytic oxidation purification device and method for high-chlorine refractory wastewater. In particular, it relates to a catalytic oxidation purification method for pyridines (chlorinated pyridines, pyridine acids), nitroaromatics, halogenated organic pollutants, and anthraquinones under high chloride ion conditions. Background technique [0002] Fenton oxidation technology is an important technology in the process of refractory industrial wastewater treatment. It is generally believed that Fenton technology mainly catalyzes the generation of hydroxyl radicals (·OH) to oxidize and mineralize refractory organic matter to achieve removal. When Fenton technology treats high-chlorine refractory wastewater, due to the presence of chloride ions, most of the OH is converted into Cl, and then Cl is converted into dichloride anion radicals (Cl 2 - ), ·Cl ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/72C02F1/74C02F1/66C02F1/52C02F101/36
CPCC02F1/5236C02F1/66C02F1/722C02F1/725C02F1/74C02F2101/36C02F2209/08C02F2209/20C02F2305/026
Inventor 韩京龙王爱杰王鸿程翟思媛刘慧玲
Owner HARBIN INST OF TECH SHENZHEN GRADUATE SCHOOL
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