Removal of Pesticides by a Combined Ozonation/Attached Biomass Process Sequence

Authors: Mezzanotte, Valeria¹; Canziani, Roberto²; Sardi, Elisabetta³; Spada, Lorenzo³

Source: Ozone: Science and Engineering, Volume 27, Number 4, August 2005 , pp. 327-331(5)

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Abstract:

Different combinations of ozonation and biological treatments were tested on an industrial effluent containing high pesticide concentrations. Ozonation was performed in 450 L columns at 1.5 h HRT each. Biological treatment was carried out in a submerged filter (BIOFOR). Ozone was effective in removing herbicides but dosages up to 1000 mg L -1 were needed. The improved biodegradability of the organic compounds after pre-ozonation was demonstrated by Oxygen Uptake Rates (OUR) tests and by the efficiency of biological treatment towards COD, and pesticides. The Italian discharge limit of 50 ppb total pesticides was achieved by combining pre-ozonation, biological treatment, and post- ozonation.

Keywords: Ozone; Pesticide Removal; Combined Oxidation; Industrial Wastewater; Toxicity Reduction

Document Type: Research article

DOI: http://dx.doi.org/10.1080/01919510591008362

Affiliations: 1: Dipartimento di Scienze dell'Ambiente e del Territorio, Università degli Studi di Milano Bicocca, Milano, Italy 2: Sezione Ambientale, DIIAR Politecnico di Milano, Milano, Italy 3: Air Liquide Italia Service, Milano, Italy

Publication date: 2005-08-01