Phenolic Wastewater Treatment Solution
2024-01-03
1. OverviewCentrifugal Extraction Process for Phenol RemovalPhenolic wastewater is commonly generated in industries such as petrochemical, coal chemical, pharmaceutical, resin manufacturing, and coking plants. Phenols are toxic organic pollutants that can seriously harm aquatic ecosystems and human health if discharged without proper treatment.
Liquid-liquid extraction using centrifugal extractors is an efficient method for removing and recovering phenolic compounds from wastewater, especially for high-concentration phenol streams.
Our solution integrates PH adjustment, multi-stage centrifugal extraction, stripping, and scrubbing, providing an efficient and continuous process for phenol removal and solvent recycling.2. Process Flow of Phenolic Wastewater Treatment
2.1 PretreatmentBefore entering the extraction section, the phenolic wastewater is conditioned to ensure stable extraction performance. Steps include:
Acid dosing to adjust pH to extraction requirements
Oil removal using oil separators or flotation units
Removal of suspended solids through sedimentation or filtrationPurpose:Protect extraction equipment
Improve phase separation efficiency
Stabilize extraction performance2.2 Three-Stage Counter-Current Extraction (Phenol Removal)The pretreated wastewater and organic extractant are pumped into multi-stage centrifugal extractors operating in counter-current mode.Advantages of centrifugal extraction:Extremely fast phase separation
Compact equipment size
Continuous operation
High extraction efficiency
The raffinate (dephenolized wastewater) is then sent to biological treatment units for final polishing.2.3 Two-Stage Stripping (Solvent Regeneration)The loaded organic phase containing phenols is sent to the stripping section.
In this stage:
Alkaline solution (NaOH) is used as the stripping agent
Phenols are transferred from the organic phase to the aqueous phase
A phenolate solution is generatedBenefits:Recovery of valuable phenolic compounds
Regeneration of the organic solvent
This stage typically uses two stripping stages to achieve high stripping efficiency.
4 Solvent Washing
After stripping, the regenerated organic solvent passes through a washing stage to remove impurities and residual alkaline solution.
This step ensures:
Stable solvent performance
Long solvent lifetime
Reduced solvent consumption
The cleaned solvent is then recycled back to the extraction section.5 Biological TreatmentThe treated wastewater with low phenol concentration is sent to the biological treatment system.
Typical units include:
Activated sludge process
MBR system
Aerobic biological treatment
Since most phenol has already been removed during extraction, the biological system operates more efficiently and stably.This technology is widely used in:Coal chemical industry
Petrochemical plants
Pharmaceutical wastewater treatment
Resin and phenolic resin production
Coking wastewater treatment
Fine chemical manufacturingFAQ-Centrifugal Extraction Process for Phenol Removal1. What phenol concentration can this process treat?The centrifugal extraction process can treat wastewater containing hundreds to several thousand mg/L phenols, depending on solvent selection and process design.
2.What solvents are commonly used for phenol extraction?
Common extraction solvents include:
MIBK (methyl isobutyl ketone)
Diisopropyl ether
Mixed amine extractants
These solvents have high distribution coefficients for phenol and good regeneration performance.3.Why use centrifugal extractors instead of mixer settlers?Centrifugal extractors offer several advantages:
Much smaller equipment size
Faster phase separation
Lower solvent inventory
Higher operational stability
Can this system recover phenol?
Yes. The stripping stage produces a phenolate solution, which can be further processed to recover phenol or reused in chemical production
➡️ Please contact us for details!
