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Treatment of wastewater from the Oils industry

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Year 2011 

Project location Valle de Escombreras, Cartagena – Murcia.

Objectives 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 m /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.

Background

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.

                                                  Wastewater characteristics 

CODConductivityTSS

fluctuant with average of 5.500 mg/L 

20.000 μS/cm 

>1.000 mg/L 

 

      Performance of the treatment 

COD removalTSS removal

>97% 

>97% 



Process diagram 

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