Treatment of wastewater from the Oils industry

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Year: 2011 

Project location: Valle de Escombreras, Cartagena – Murcia.

Objetives: Modify the current wastewater treatment system, which is not being effective, to comply with current discharge requirements and the possibility for water reuse.

Installed technologies 

Full Pre-treatment by SIGMA: homogenization tank with a JET aeration system; a coagulation-flocculation equipment with a compact PFL chemical dosing system capable of treating up to 10 m3/h; a DAF FPAC-CPL15 physic-chemical flotation system. 

Modification of the biological treatment: replacement of the old homogenization tank and old SBR reactor by two continuous aeration tanks as biological treatment with the installation of aerators; DAF FPAC-CPL20 flotation as secondary clarifier; measurement and control equipment including control panel. 

Capacity: 100 m3/day.

Wastewater characteristics 




 fluctuant with average of 5.500 mg/L  

20.000 μS/cm 

>1.000 mg/L 


Performance of the treatment  

COD removal 

TSS removal 




Aceites Especiales del Mediterráneo S.A. (AEMEDSA) is a world leader in the manufacture and marketing of white mineral oils and natural sulfonates. Its industrial activity is combined with the fulfilment of the Environmental Responsibility commitments. The AEMEDSA wastewater treatment installed by SIGMA makes it possible to comply with the current requirements for the discharge of industrial wastewater, plus the possibility to reuse the water in the process. 

The wastewater is homogenized in a tank provided with aeration and is pumped to a SIGMA PFL system where coagulation, flocculation and pH adjustment are carried out. The DAF FPAC-CPL15 primary clarifier allows the separation of the flocs generated, eliminating fats and oilsm suspended solids and part of the organic matter. In the biological reactor, the elimination of all organic matter and nutrients is carried out, a DAF FPAC-CPL20 is applied as a secondary clarifier. The discharged water is of very high quality and, in addition to being discharged into the sanitation network, it can be reused in the process. The sludge generated in the process undergoes pro-centrifugal thickening and dewatering. 

Process diagram

Process of the wastewater treatment plant of an Essential Oils industry for discharge and reuse as process water. O SIGMA’s technology blog.

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