Excessive COD (chemical oxygen demand) in industrial wastewater has always been a difficult problem for environmental management. Traditional processes are inefficient and costly, but centrifugal extractor is becoming the "black technology" in the field of wastewater treatment with their technical combination of "high-speed centrifugation + intelligent extraction". How does it achieve efficient removal of COD?

COD Extraction Principle of Centrifugal Extractor

The centrifugal extractor generates a super gravity field through a high-speed rotating drum (3000-4000r/min), which can complete the mixing, mass transfer and separation of wastewater and extractant in just a few seconds, greatly shortening the treatment cycle. Its core advantages include:

High-efficiency separation: Rapid stratification using density difference, COD removal rate can reach more than 96%.
Precise extraction: Matching suitable extractants for different pollutants (such as phenols, sulfonic acids, heavy metals) to achieve targeted purification.
Energy saving and consumption reduction: The solvent recycling rate exceeds 98%, and the energy consumption is only 1/3 of that of traditional equipment.

Application of Centrifugal Extractor in COD Extraction

  1. Chemical wastewater: efficient purification of naphthalenesulfonic acid and cyclohexanesulfonic acid
    The two-stage cross-current extraction using the centrifugal extractor reduced the COD of naphthalenesulfonic acid wastewater from an initial 28,000 mg/L to 1470 mg/L, achieving a removal rate of 94.6%. The organic matter recovered by stripping can be directly reused in the production line, realizing "turning waste into treasure".
  2. Phenolic wastewater treatment
    The centrifugal extractor combines with solvents such as tributyl phosphate (TBP) can quickly absorb phenolic substances in wastewater. Datas from a certain project showe that after treatment, the COD concentration droppes from 5000mg/L to below 50mg/L, and the operating cost reduces by 20%.
  3. Coordinated removal of heavy metals and COD
    For heavy metal ions such as copper and zinc in electroplating and mining wastewater, heavy metals are adsorbed by chelating extractants, and COD values ​​are reduced simultaneously, achieving "one machine, two effects".
  4. Recovery of high-concentration organic solvents
    After centrifugal extraction of organic solvent wastewater such as DMF and DMAC, the solvent recovery rate exceeds 98%, and the residual liquid COD is stable and meets the standard, directly reducing the cost of hazardous waste treatment.

How to Make COD Extraction Smarter?

  1. Multi-stage countercurrent extraction process
    By connecting multiple equipment in series, the wastewater and the extractant are in countercurrent contact and purified step by step. In a certain project, the extraction efficiency was increased by 30% by optimizing the number of stages.
  2. Intelligent parameter control
    Speed ​​regulation: Dynamically adjust the drum speed according to the viscosity of the wastewater to avoid back mixing;
    Flow optimization: Accurately control the ratio of extractant to wastewater (such as 1:3) to reduce solvent loss.
  3. Solvent regeneration technology
    Use alkaline solution back extraction to recover pollutants and regenerate solvents at the same time, realizing a "zero emission" circulation mode.

With the advantages of high efficiency, energy saving and intelligence, the application scenarios of centrifugal extractor will extend to more difficult wastewater fields.
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