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Elimination of fuel spills from effluent using cloud point extraction methods.

H Ghouas¹, B Haddou, H Bouabdesselam

¹E. N. S. E. T Oran, BP 1523, M'Nouarr, Oran, Algeria.

Journal of Hazardous Materials

|May 4, 2010

Summary

Cloud point extraction effectively removes hydrocarbons from fuel storage effluents using biodegradable surfactants. This method significantly reduces chemical oxygen demand (COD), offering an efficient wastewater treatment solution.

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Area of Science:

Environmental Chemistry
Separation Science
Wastewater Treatment

Background:

Fuel storage centers generate aqueous effluents with high chemical oxygen demand (COD) due to hydrocarbon contamination.
Hydrocarbons like gasoline, diesel, and kerosene pose significant environmental risks in wastewater.

Purpose of the Study:

To evaluate the efficacy of cloud point extraction (CPE) for removing hydrocarbons from real industrial wastewater.
To investigate the performance of two biodegradable non-ionic surfactants, Lutensol AO7 and Triton X-114, in hydrocarbon removal.
To determine the influence of operational parameters on the extraction efficiency.

Main Methods:

Cloud point extraction (CPE) was employed to treat hydrocarbon-contaminated aqueous streams.
Phase diagrams of water-surfactant and water-surfactant-hydrocarbon systems were determined.
The effect of sodium sulfate and pH on the extraction process was investigated.
Residual chemical oxygen demand (COD), surfactant concentration, and coacervate volume fraction were quantified.

Main Results:

Both Lutensol AO7 and Triton X-114 significantly reduced COD levels, from 7000 mg O(2)/L to as low as 30-50 mg O(2)/L at room temperature.
Extraction efficiency was found to be reduced under basic pH conditions.
The study determined optimal conditions using three-dimensional diagrams based on surfactant concentration and temperature.

Conclusions:

Cloud point extraction with biodegradable non-ionic surfactants is a viable method for treating hydrocarbon-rich industrial wastewater.
The process demonstrates high efficiency in reducing COD, indicating effective hydrocarbon removal.
The pH-dependent extraction efficiency suggests potential for surfactant regeneration in wastewater treatment.