Acrylate wastewater treatment process
Acrylic ester industry has a very broad development prospects, while bringing environmental issues can not be ignored, the acrylic ester wastewater treatment process is inevitable concern. The following Liyuan environmental protection with you to understand the treatment of such industrial wastewater.
Acrylate wastewater mainly contains acetic acid, methacrylic acid, acrylic acid, formaldehyde, acetaldehyde, methyl sulfonic acid and some aromatic compounds and other organic matter, its chemical oxygen demand (COD) up to tens of thousands of hundreds of thousands of mg / L, belongs to the high concentration of organic wastewater, with high concentration, complex composition, toxic and harmful features, strongly acidic, with a certain degree of corrosiveness.
At present, acrylate wastewater treatment, the following types of methods are commonly used at home and abroad:
(1) biological treatment methods, that is, the use of a variety of anaerobic, aerobic process or a combination of processes to deal with such wastewater, for BOD/COD is low, not easy to biochemical wastewater, can be added to some of the easy to biochemical organic matter or sewage mixing and dilution of wastewater treatment.
(2) Depth oxidation method, through various methods to produce hydroxyl radicals and organic reaction, direct oxidation of organic matter as CO2, H2O and other substances, or as a pretreatment means of biochemical treatment, oxidation and decomposition of non-biodegradable organics into readily biodegradable organics, to improve the biochemistry of wastewater, such technologies are: iron and carbon microelectrolysis technology, Fenton reagent oxidation, photocatalytic oxidation technology, wet oxidation technology, and so on. technology, photocatalytic oxidation technology, wet oxidation technology, etc.
(3) Physicochemical method, including coagulation, precipitation pretreatment, the use of evaporation, drying, crystallization and other methods to separate the pollutants in the acrylic ester wastewater and water to achieve the purpose of wastewater purification.
In the application of acrylate wastewater treatment process, often combined with a variety of technologies, comprehensive treatment, to achieve effective treatment of wastewater.
Acrylic acid is an important chemical raw material, with the development of the economy, promote the development of the whole industry, in the process of development will bring a large amount of sewage, in order to avoid damage to the environment, the need to use the appropriate acrylic acid industry wastewater treatment methods to be discharged after the treatment of standards. The following Liyuan environmental protection with you to understand the acrylic industry sewage treatment.
Acrylic acid industry wastewater contains acetic acid, methacrylic acid, acrylic acid, formaldehyde, acetaldehyde and other organic substances, its chemical oxygen demand (CODcr) as high as tens of thousands to more than a hundred thousand mg / L, strongly acidic, belonging to the high-concentration organic wastewater, characterized by high concentration, complex composition, toxic and hazardous, etc., the traditional method of treatment is more difficult.
At present, acrylic acid industry wastewater treatment methods are mainly biochemical method, catalytic wet oxidation and incineration method. Due to the sewage contains toxic substances to microorganisms, and the lack of nutrients, the direct use of biochemical treatment of this type of wastewater, especially for high concentrations of acrylic acid wastewater effect is not good. The catalytic wet oxidation method can not completely degrade the organic matter in the acrylic acid production wastewater, and there are problems of catalyst failure and secondary pollution, the reaction of the water still needs further treatment, increasing the cost of treatment. Incineration method has the problems of high cost and large one-time investment, which makes it difficult to be promoted industrially.
In order to solve the above problems, the acrylic acid industry wastewater treatment by electrocatalytic oxidation, the effluent into the comprehensive adjustment pool to adjust the water quality, water quantity and pH, the comprehensive adjustment pool effluent into the pulsed anaerobic reaction pool, after anaerobic treatment, pulsed anaerobic reaction pool effluent into the contact oxidation pool aerobic treatment, the treated wastewater into the second sedimentation tank for mud-water separation, can meet the standards of the wastewater discharged.
This acrylic acid industry wastewater treatment method through the anaerobic biochemical treatment before the addition of electric hydrogenation oxidation device, and pulse anaerobic reactor instead of the traditional anaerobic reaction pool, the treatment process is simple, the treatment capacity is large, and the treatment efficiency has been greatly improved.
Acrylic acid waste gas source characteristics
Acrylic acid waste gas mainly comes from the production and use of acrylic acid and its derivatives. These exhausts usually contain volatile organic compounds (VOCs) such as acrylic monomer, methyl acrylate, ethyl acrylate, and so on. The main characteristics of acrylic exhaust include:
Complex composition: the exhaust gas may contain a variety of acrylic acid and its derivatives, which have different chemical properties and toxicity.
Concentration fluctuation: Due to changes in production activities, the concentration of acrylic acid and its derivatives in the exhaust gas may also fluctuate, increasing the difficulty of treatment.
Harmful: Acrylic acid and its derivatives are potentially harmful to human health and the environment, and their emissions need to be strictly controlled.
Acrylic acid waste gas treatment process
The acrylic waste gas treatment process usually includes the following steps:
Exhaust Gas Collection: Collect the acrylic waste gas generated during the production process through pipelines and facilities such as air collection hoods to prevent it from being emitted directly into the atmosphere.
Pre-treatment: Pre-treatment of the collected exhaust gas, such as dust removal, mist removal, etc., in order to remove solid particles and liquid droplets in the exhaust gas and provide favorable conditions for subsequent treatment.
Adsorption treatment: Adsorption of acrylic substances in the exhaust gas using adsorbents such as activated carbon to purify the exhaust gas. Activated carbon has a high specific surface area and excellent adsorption performance, which can effectively remove VOCs in the waste gas.
Catalytic oxidation: Under the action of a specific catalyst, the VOCs in the exhaust gas undergo flameless oxidative combustion at a lower ignition temperature, oxidizing and decomposing into CO2 and H2O, and releasing a large amount of heat energy. Catalytic oxidation technology has the advantages of high processing efficiency and low energy consumption, which is an effective method to treat acrylic waste gas.
Acrylic waste gas treatment case
The following is a case of acrylic acid waste gas treatment:
Case background: A chemical plant produces a large amount of acrylic exhaust gas during the production of acrylic resin, and the direct emission of these exhaust gases into the atmosphere will have a serious impact on the environment and human health. In order to solve this problem, the chemical plant used activated carbon adsorption + catalytic oxidation of the exhaust gas treatment process.
Treatment process:
Exhaust gas collection: The acrylic acid exhaust gas generated during the production process is comprehensively collected through a highly efficient air collection system.
Pre-treatment: The collected exhaust gas is de-dusted and de-misted to remove the solid particles and liquid droplets.
Activated carbon adsorption: The pre-treated exhaust gas is sent to the activated carbon adsorption tower for adsorption treatment. The activated carbon adsorption tower is filled with activated carbon adsorbent with high specific surface area, which can effectively adsorb acrylic acid substances in the waste gas.
Catalytic oxidation: When the activated carbon adsorption is saturated, desorption is carried out by hot air or steam to desorb the acrylic substances adsorbed on the activated carbon. The desorbed high concentration organic waste gas is then sent to the catalytic oxidation device for catalytic oxidation treatment. Under the action of catalyst, VOCs undergo flameless oxidative combustion at a lower temperature, and oxidatively decompose into CO2 and H2O.
Tail gas emission: After the catalytic oxidation treatment, the tail gas is cooled and filtered, and then discharged into the atmosphere. At this time, the acrylic substances in the tail gas have been basically removed cleanly, meeting the requirements of environmental protection emissions.
By adopting the waste gas treatment process of activated carbon adsorption + catalytic oxidation, the chemical plant has successfully solved the problem of acrylic acid waste gas emission, and made a positive contribution to environmental protection.
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