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Problems and causes of marginal nutrient availability in winery wastewater treatment

Bakos, V. and Kiss, B. and Jobbágy, A. (2016) Problems and causes of marginal nutrient availability in winery wastewater treatment. Acta Alimentaria, 45 (4). pp. 532-541. ISSN 0139-3006

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Abstract

Winery wastewater treatment plants generally face severe nutrient deficiency, and therefore conventional technologies and supplementary nutrient dosing strategies may fail. The purpose of the paper is to show how traditional way of dosing N-source for marginal availability to nutrient deficient influents results in poorly settling activated sludge regardless of the application of aerated or non-aerated selectors. External N-source calculated for marginal availability resulted in nutrient deficiency due to the relatively high yield experienced (0.7 g biomass COD/g substrate COD). In the fully aerated system with overall N-deficiency, rapidly increasing overproduction of extracellular polysaccharide was experienced, leading to SVI (Sludge Volume Index) values up to 600 cm<sup>3</sup> g<sup>−1</sup>. In the system with the non-aerated selector, initial nutrient deficiency could only be detected in the second reactor. Since neither overgrowth of floc-forming GAOs (Glycogen Accumulating Organisms) nor denitrification could be experienced, the non-aerated reactor operated as low-DO (Dissolved Oxygen) basin, attributing to the drastic overgrowth of filamentous bacteria leading to SVI values >1000 cm<sup>3</sup> g<sup>−1</sup>. Since dosing external N-source for marginal availability is likely to cause severe biomass separability problems in activated sludge winery wastewater treatment, either pronounced N-overdosing and pre-denitrification or severe nutrient deficiency and GAO cultivation can rather be recommended.

Item Type: Article
Subjects: Q Science / természettudomány > QD Chemistry / kémia > QD01 Analytical chemistry / analitikai kémia
Depositing User: Erika Bilicsi
Date Deposited: 05 Dec 2016 10:37
Last Modified: 31 Dec 2017 00:17
URI: http://real.mtak.hu/id/eprint/42818

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