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Content archived on 2024-05-07

Recyling of rinse waters from metal finishing facilities elimination of organics by catalytic oxidation

Exploitable results

The electronic industry uses large amounts of rinse water for the production of printed circuit boards (PCBs) and semiconductors. The development of a new water recycling process based on advanced oxidation was studied within a European Research Project coordinated by Anjou Recherche. Typical organic compounds found in rinse waters from printed circuit boards (PCB) production were treated in a lab-scale test rig by catalytic ozonation followed by biological degradation. Ozonation in presence of a transition metal supported catalyst allowed a 25% TOC removal with acceptable ozone doses (3-4 g O3/g TOC). A pilot scale prototype combining catalytic ozonation, biological granular activated carbon and reverse osmosis was then built and installed in a semiconductor plant located in France. This prototype is a fully automated, mobile unit designed for a 1 m3/hr throughput.. The pilot scale results fully validated the results obtained at the lab scale : a TOC and conductivity abatement of about 96% were routinely obtained.

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