Fenton equipment

Fenton equipmentAlso known as Fenton oxidation equipment, Fenton reactor, Fenton reaction device, etc., it is a necessary equipment for the oxidation of wastewater. Let me introduce the Fenton equipment to you.

1、 The principle of Fenton device

hydrogen peroxide(H2O2)Compared to divalent iron ions(Fe2+)The mixed solution oxidizes large molecules into small molecules, and oxidizes small molecules into carbon dioxide and waterFeSO4Can be oxidized to3Valence iron ions have a certain coagulation effect,3Valence iron ions turn into iron hydroxide, which has a certain net trapping effect, thus achieving the purpose of water treatment. Fenton reagent has found its place in environmental chemistry, with high ability to remove recalcitrant organic pollutants. It has been widely used in the treatment of wastewater such as printing and dyeing wastewater, oily wastewater, phenol containing wastewater, coking wastewater, nitrobenzene containing wastewater, and diphenylamine wastewater.

2、 Factors affecting Fenton device response

effectFenton equipmentOxidation reaction effect and rate factor: the characteristics of the reactants themselves,H2O2The dosage,Fe2+The concentration,pHValue, reaction time, temperature.

1Temperature factor

In the Fenton reaction, temperature is an important factor affecting its effectiveness. As the temperature continues to increase, the speed of the Fenton reaction will gradually accelerate. With the increase of temperature,˙OHThe generation speed will increase, which can promoteOHReacting with organic matter to enhance oxidation efficiency and improveCODCrThe removal rate. The increase in temperature will also causeH2O2The decomposition speed accelerates and decomposes intoO2giveH2OThis is forOHThe generation is unfavorable for Fenton. The appropriate temperature for Fenton reaction varies among different types of industrial wastewater,

2、pHprice

Normally, Fenton reagents only react in acidic environments,pHThe improvement will makeOHThe occurrence is limited and there may be precipitation of iron hydroxide, resulting in loss of catalytic ability. If there is a high concentration in the solutionH+，Fe3+Cannot be restored toFe2+Catalytic reactions will be hindered by Fenton. There are research results indicating that in acidic environments, especiallypHexist3-5During this period, Fenton reagent has strong oxidation ability, and the degradation rate of organic matter is relatively fast, which can be degraded within a few minutes. At the same time, the reaction rate of organic compounds andFe2+And the initial concentration of hydrogen peroxide is directly proportional. The use of Fenton process in industrial treatment requires the treatment of wastewaterpHAdjust to3.5Left and right are better.

3Organic compounds

The usage and oxidation efficiency of Fenton reagent vary for different types of industrial wastewater, mainly due to the presence of different types of organic compounds in different types of industrial wastewater. For carbohydrates such as sugars, due to the action of hydroxyl radicals, molecules undergo dehydrogenation reactions,C-CKey breakage chain;For water-soluble polymers and ethylene compounds, hydroxyl radicals can causeC=CKey breakage. Hydroxyl radicals can cause aromatic compounds to undergo ring opening and form fatty compounds, reducing the biological toxicity of this type of wastewater and improving its biodegradability.

4、H2O2Quantity of catalyst input

When using the Fenton process to treat industrial wastewater, it is necessary to clarify the amount of chemicals to be used and their economic viabilityH2O2If the quantity is relatively large, it will increase the concentration of wastewaterCODCrThe removal rate. But after reaching a certain quantity,CODCrThe removal rate will show a gradually decreasing trend. The quantity of catalyst input andH2O2The same situation exists in the amount of investment,Fe2+The quantity has increased,CODCrThe removal rate will increase to a certain extent,CODCrThe removal rate will decrease Fenton. In practical work, it is necessary to clarify through experimentsH2O2The amount of catalyst input.

3、 Application of Fenton equipment in the treatment of some industrial wastewater

1Application of Fenton equipment in printing and dyeing wastewater

The color of printing and dyeing wastewater is relatively high, the concentration of chemical oxygen demand is relatively high, the salt content is also relatively high, and the biodegradability is not strong. Fenton reagent has high oxidation ability, which can convert some organic compounds that are difficult to biodegrade into substances with good biodegradability, destroy the chromophores in dyes, and reduce chromaticity. Therefore, it is widely used in the treatment of printing and dyeing wastewater. Using Fenton derived processes, such as microelectrolysis-FentonThe oxidation process is used to treat anthraquinone dyeing and finishing wastewater, which is difficult to degrade. The removal rate of chemical oxygen demand is93.5%about,BOD5The removal rate is93%Left and right, the color of the effluent can be removed95.5%about. existpHdo2-4During the interval, the amount of hydrogen peroxide input is30g/LThe amount of catalyst input is hydrogen peroxide1/150When using Fenton process for intermediatesHThe treatment of wastewater from acid production can achieve50%The removal rate of chemical oxygen demand.

2Application of Fenton equipment in coking wastewater

Coking wastewater contains polycyclic aromatic hydrocarbons and nitrogen-containing heterocyclic compounds that are difficult to biodegrade. The wastewater also contains many biologically toxic and inhibitory substances. Even with biochemical treatment, it is difficult for the wastewater to meet the standards. The anaerobic aerobic process cannot achieve reasonable discharge standards for coking wastewater. Although the use of activated carbon technology for treatment can achieve certain results, this process method has relatively high cost consumption and may cause secondary pollution. The Fenton process has broad development prospects in the treatment of refractory organic wastewater and can achieve good results.

3Application of Fenton equipment in landfill leachate

The leachate from garbage contains a high concentration of organic matter, most of which are difficult to biodegrade, as well as many toxic and harmful substances. The concentration of ammonia nitrogen is relatively high, and the proportion of microbial nutrients is severely imbalanced. Using general biochemical treatment processes, the process is complex and the effect is average. By using the Fenton process to treat the biochemically treated leachate, the effluent quality can meet the secondary sewage discharge standard, which can improve the biodegradability of the leachate and provide important guarantees for the subsequent biochemical treatment.

4Application of Fenton equipment in phenol containing wastewater

Phenolic substances have high toxicity and carcinogenic effects on the human body, making them difficult to degrade industrial wastewater. The Fenton process can be processed and has good results. If the room temperature is reasonable,pHexist3-6Between them, there is also an iron oxide catalyst, and hydrogen peroxide can quickly destroy the structure of phenols. During the oxidation process, it can first split the benzene ring into dicarboxylic acids, and then generate carbon dioxide and water.

4、 Advantages of Fenton equipment technology

1、Environmentally friendly: treated differently from other chemicals such as bleach(sodium hypochlorite)It is prone to produce toxic substances such as chlorinated organic compounds, which can cause harm to the environment.

2、Small footprint: The oxidation rate of organic matter is quite fast, and the required residence time is short,make an appointment0.5~2Hours are sufficient, unlike typical biological treatments that require approximately12~24Due to the short time, the relative reaction tank volume does not need to be too large, which can save space.

3、High operational flexibility: The operating conditions can be changed according to the quality of the incoming water to increase the processing capacity. However, general biological treatments are difficult to flexibly operate. For higher pollution levels, it is only necessary to increase the concentration of ferrous andH2O2Dosage and appropriate dosagepHJust control it.

4、Low initial cost: Compared with general biological treatment systems, it only requires about the investment cost1/3~1/4.

5、Strong oxidizing ability: generated hydroxyl radicals(OH)The oxidation ability is quite strong. Can handle various toxic substances, such as vinyl chlorideBTEXChlorobenzene, phenol, polychlorinated biphenylsTCE、DCE、PCEWait, another oneEDTAAnd ketonesMTBE、MEKWaiting is also effective.

The Fenton process is widely used in phenol containing wastewater, which can reduce the biological toxicity of the wastewater and improve its biodegradation performance.

The Fenton process of Fenton equipment can effectively degrade toxic organic pollutants and has a wide range of application atmospheres, achieving good results in both laboratory and practical applications. The current industrial wastewater treatment advocates the development model of circular economy. Using a single sewage treatment plant to treat toxic wastewater cannot achieve ideal results. The Fenton process is a very effective wastewater treatment method, which can achieve biodegradability and deep treatment of wastewater. In addition, other technologies can realize the reuse of reclaimed water to achieve the purpose of recycling.

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