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Wastewater treatment of agri-food industry

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Year 2011 

Project location Cartagena – Murcia.

Objectives Complete treatment of the wastewater: conditioning by homogenization, refrigeration and physical-chemical treatment with SIGMA DAF and subsequent biological treatment in a bioreactor with ultrafiltration membranes, in addition to the treatment of the resulting sludge. Compliance with discharge limits.

Installed technologies Wastewater treatment: homogenization tank with cooling system, physical-chemical coagulation-flocculation treatment and a SIGMA DAF dissolved air flotation unit and pH control, MBR configuration biological reactor with a Berghof Bio-flow tubular ultrafiltration membrane system with a pre-safety filter and CIP cleaning system. Sludge treatment: two thickening units with centrifuge and polyelectrolyte addition system.

Capacity 480 m3/day.

Background

BUNGE Ibérica is a leading company in the agri-food sector. They focus on improving the agribusiness and food production chain through the manufacture and export of fertilizers, feed, production and processing of seeds and grains, production of bottles of oils, mayonnaise, margarine and similar products, and the grinding of wheat and corn.

BUNGE operates two refineries, soybean and sunflower, and an extraction unit. The wastewater produced is characterized by a very high temperature (between 45 and 58 ºC), which will make it require a special pre-treatment before undergoing biological treatment. This treatment is necessary to comply with the current discharge limits. All three discharges can be treated in the same treatment train as they have similar treatability characteristics.

                                                                     Wastewater characteristics 

WastewaterCODConductivityTSS

Sunflower refinery + soybean refinery + extraction 

2.500 mg/L 

6.000 μS/cm 

394 mg/L 

 

  Treatment performance 

COD removal

TSS removal

95% 

94% 


Process diagram 


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