Activated sludge nuisances in a vegetable processing wastewater pretreatment plant

Jobbágy, A. and Kiss, B. and Bakos, V. and Tardy, G. (2009) Activated sludge nuisances in a vegetable processing wastewater pretreatment plant. Acta Alimentaria, 38 (3). pp. 393-404. ISSN 0139-3006

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Abstract

In order to decrease the organic load on the downstream domestic wastewater treatment plant, a three stage, fully aerated activated sludge system was established for the pretreatment of a vegetable processing wastewater. The results of the research verified that this design was inappropriate at the given, highly fluctuating wastewater quality. Nitrate formed through nitrification of the pea processing wastewater could not be denitrified, thus rising sludge occurred in the secondary clarifiers. On the other hand, during the corn campaign, severe deterioration of the COD (Chemical Oxygen Demand) removal efficiency, as well as the overproduction of extracellular polysaccharides leading to viscous bulking, were caused by the extremely high C/N ratio. In order to efficiently treat the wastewater of the vegetable processing industry, establishment of highly flexible systems with unaerated first stage proves to be necessary.

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