An Italian seafood factory, engaged in the preparation of retail fish products, was investigated. The behaviour of the wastewater treatment plant constituted by a low load biological oxidation, with nitrogen denitrification was studied. Operative difficulties connected with the quali-quantitative changes in the industrial production are evidenced. The major points outlined are: start-up at design conditions, four years' management at extended oxidation (SRT = 80 days), discharge lines organization to assure plant efficiency after introducing seafood prefrying production.

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