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Technology and Engineering
- ISSN: 2333-2581
- Modern Environmental Science and Engineering
Food Industry Wastewater Treatment Plant based on Flotation and MBBR
Luigi Falletti1, Lino Conte1, Alessandro Zaggia1, Tiziano Battistini2 and Doriano Garosi3
1. Department of Industrial Engineering, University of Padova. 35100 Padova, Italy;
2.. Aquaspace, Aquafil Group. 38068 Rovereto (TN), Italy;
3. SIBA SpA Veolia Aqua Group. 20100 Milano, Italy
Abstract: This paper deals with a plant that treats wastewater of an Italian food industry. The plant is made of a pumping station, a fine screen, an accumulation tank (182 m3), two parallel dissolved air flotation tanks with lamellae (each with footprint 5.6 m2, projected surface 14.4 m2, volume 3.4 m3), a hybrid MBBR oxidation tank (148 m3) filled with 35% AnoxKaldnesTM polyethylene carriers followed by an activated sludge oxidation tank (292 m3) and a sedimentation tank (surface 33 m2, volume 73 m3); sludge is thickened and dehydrated. On average basis, the plant has treated 152 m3/d wastewater with 9657 mg/L COD, 7848 mg/L BOD and 308 mg/L greases; the primary flotation has removed 64% of COD, 70% of BOD and 65% of greases; the whole plant has removed 97% of COD and 99% of greases, and has a significant residual capacity.
Key words: activated sludge, biofilm, food industry wastewater, flotation, moving bed
