The treatment of naphthenic acid wastewater is relatively complicated due to its high COD concentration and difficulty in biodegradation. As an effective liquid-liquid extraction and separation equipment, the centrifugal extractor plays an important role in the treatment of naphthenic acid wastewater. The following is a detailed process for using the centrifugal extractor to treat naphthenic acid wastewater.
Process Flow of Treating Naphthenic Acid Wastewater By Centrifugal Extractor
- Pretreatment
Oil removal: naphthenic acid wastewater may contain a large amount of oil, which needs to be removed first to reduce interference with the extraction process. Oil removal can be achieved by oil separation, demulsification, flocculation, flotation and other methods.
Acidification: Sometimes it is necessary to add acidifiers such as sulfuric acid to the wastewater to adjust the pH value of the wastewater to make it more suitable for the subsequent extraction process. - Extraction operation
Prepare the extractant: Select a suitable extractant, such as a mixture of tertiary amine and diesel, the ratio and concentration of which need to be determined according to the characteristics of the wastewater.
Mixed extraction: Inject the pretreated naphthenic acid wastewater and the extractant into the centrifugal extractor in a certain proportion. Under the action of centrifugal force, organic matter such as naphthenic acid in the wastewater is effectively extracted by the extractant.
Two-phase separation: After the rotation of the centrifugal extractor, the organic matter and the extractant in the wastewater form two distinct phases, achieving complete separation of the two phases. - Stripping and regeneration
Stripping: The extractant enriched with organic matter is sent to the stripping equipment and mixed with stripping agents such as sodium hydroxide. The organic matter is separated from the extractant through the stripping process.
Regeneration of the extractant: The extractant after stripping can be recycled, thereby reducing the processing cost. - Subsequent treatment
Biochemical treatment: The raffinate phase (i.e. wastewater after extraction treatment) usually needs to be biochemically treated to further remove organic matter and pollutants.
Deep treatment: According to needs, deep treatment steps such as acidification-coagulation, Fenton oxidation, flocculation-sand filtration and biological activated carbon can also be carried out to ensure that the wastewater meets the discharge standards.
Notes
- Operating condition control: During the extraction process, operating conditions such as temperature, pressure, flow rate and contact time need to be strictly controlled to ensure extraction efficiency and treatment effect.
- Equipment maintenance: Regularly inspect and maintain the centrifugal extractor and its ancillary equipment to ensure that the equipment is in good operating condition. Pay special attention to the wear and fouling of key components such as the drum, and clean and replace them in time.
- Environmental protection and safety: During the treatment process, environmental protection laws and regulations and safety operating procedures must be strictly observed to prevent wastewater, waste gas, waste residue, etc. from causing pollution and harm to the environment.
- Economic considerations: When selecting treatment processes and equipment, factors such as treatment effect, operating costs and investment costs must be comprehensively considered to select a better solution.
In summary, using the centrifugal extractor to treat naphthenic acid wastewater is an effective method, but it is necessary to pay attention to the control of operating conditions, equipment maintenance, and environmental protection and safety issues. At the same time, it is also necessary to select appropriate pretreatment and subsequent treatment processes according to the actual situation of the wastewater to ensure the best treatment effect and economy.
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