A complex industrial wastewater case is studied. The great variety of the products and the complexity of the production procedures render it impossible to apply a conventional technology for wastewater treatment. Initially an attempt was made to reduce the quantity and the organic load by reusing wastewater and by reclaiming useful substances or products from the wastewater. To further reduce COD the multistage neutralization process is studied by regulating the pH of the acid wastewater first in the alkaline region and then at pH 7. In this way COD removal is 18% greater than with the simple neutralization process at pH 7. Once this process was completed, since the effluent COD was not within the permissible limits, oxidation of the wastewater by using ozone was recommended.

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