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.
Food Industry Wastewater Treatment Plant based on Flotation and MBBR
FALLETTI, LUIGI;CONTE, LINO;ZAGGIA, ALESSANDRO;
2015
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.
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