Articles & Case Studies

Siemens to supply one of Brazilís largest refineries with wastewater reuse solution

Posted: Thursday 24th June 2010

Siemens Water Technologies is working with Centroprojekt do Brasil S/A to supply an integrated wastewater technology solution to the Presidente Getulio Vargas Refinery (Repar) in Araucaria,Parana State,Brazil. The system will consist ofAPIoil water separators, dissolved air flotation (DAF) units, walnut shell filter units, and a Petro MBR (membrane bioreactor) system. Scheduled to come online in 2012, the system is designed to pre-treat 450 m3/hr of the treated water for reuse as boiler feed water.

The Repar refinery, which is owned and operated by Petrobras, is one of the largest industrial plants in southern Brazil, refining 31 million liters of oil daily. The refinery is responsible for roughly 12% of the countryís production of petroleum byproducts, which include LPG, gasoline, diesel fuel, fuel oils, jet fuel, asphalt and naphtha.

Siemensí integrated wastewater reuse solution includes primary, secondary and tertiary oil/water separation. During the first stage of primary oil/water separation, three trains of API separators remove up to 80% of oil from refinery process water and storm run-off. The second stage oil/water separation involves two trains of DAF units that remove additional oil from the API separator effluent, with the aid of chemicals.

Tertiary oil/water separation consists of four trains of Auto-Shell walnut shell filter units that remove additional oily contaminants from the water. Black walnut shell filters eliminate the need for flat media retention screens and can use as little as one media-scrubbing pump for up to eight filters, which simplifies the design and reduces the cost of multiple filter systems. This type of filtration removes three times the amount of oil and solids before cleaning is required.

In the final stage, tertiary treatment removes dissolved organics as pre-treatment to effluent polishing/recycle-reuse. A Petro MBR system, comprised of two biological trains and four

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