Chemical companies will generate a large amount of high concentration organic wastewater during the production and processing process. How to effectively treat the wastewater depends on the specific production requirements of the customer. For example, the treatment of 2-naphthol wastewater. As an important chemical raw material, 2-naphthol is widely used in the production process. Therefore, the amount of 2-naphthol wastewater generated is also very large. With the development of enterprise and market technology, this type of wastewater is no longer a simple biochemical discharge, but the organic components in the wastewater are first extracted and recovered, and then discharged biochemically.

Regarding naphthol wastewater treatment equipment, the CWL-M centrifugal extractor is currently the most commonly used on the market. It adopts solvent extraction to extract and recover 2-naphthol in the water with an extractant, reducing COD and thus making the wastewater meet the standards for biochemical treatment.

In the process of 2-naphthol wastewater treatment, the wastewater and the extractant are injected into the CWL-M centrifugal extractor according to a certain ratio. With the help of the rotation of the drum, the two phases are quickly mixed and dispersed through the impeller to complete the mixed mass transfer process. The mixed liquid enters the drum under the action of the vortex disk. Under the action of centrifugal force, the two phases of liquid are quickly separated and discharged from the body through different outlets to complete the two-phase separation process. After the first-stage extraction, the 2-naphthol wastewater changes from dark brown to light yellow, and the COD removal rate decreases significantly. After the second-stage extraction, the wastewater changes from light yellow to colorless and transparent, and the COD removal rate is greater than 99%. The device operates stably and the organic matter in the wastewater is effectively removed.

CWL-M centrifugal extractor is a new, fast and efficient liquid-liquid extraction and separation equipment independently developed by Zhengzhou Tiei Extraction. CWL-M centrifugal extractor is developed to address the shortcomings of the current traditional centrifugal extractors. Under the same processing capacity, the power consumption of the CWL-M centrifugal extractors is only 10% to 30% of the traditional annular gap type. At the same time, the centrifugal extractor has a short stage residence time, rapid phase separation, high extraction efficiency, and saves investment costs and solvent recovery and regeneration costs, which has a significant effect on the treatment of high-concentration 2-naphthol wastewater.

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