Since oysters are usually resoaked (in the spring wild oysters are relayed for 14 to 21 days before processing) in the water before processing, it is not possible to treat effluent from this process, which makes it difficult to reduce the risk associated with processors.
Finally, copolymer nanoporous membranes were soaked in water at room temperature for an hour and doped with 1 M sulfuric acid solution for 2 h then resoaked in water for overnight.