Impact of carbon load on granulation of activated sludge in SBR reactor fed with glycerine fraction from biodiesel production
✍ Scribed by I. Wojnowska-Baryla; A. Cydzik-Kwiatkowska; K. Selewska
- Publisher
- Elsevier
- Year
- 2009
- Tongue
- English
- Weight
- 52 KB
- Volume
- 25
- Category
- Article
- ISSN
- 1871-6784
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✦ Synopsis
Aerobic granules were obtained using a variety of carbon sources, however, it seems especially advantageous to use organic wastes form different economy branches for granulated activated sludge production. The aim of the research was to investigate the impact of organic load rate on biomass granulation in sequencing batch reactors fed with glycerin fraction from biodiesel production. The experiment was carried on simultaneously in four reactors at average carbon load of 0.2 ± 0.08, 0.6 ± 0.16, 1.1 ± 0.27, and 1.3 ± 0.35 g COD g -1 cycle -1 . Granulation did not occur in the reactor with the lowest organic carbon load. In the remaining reactors small granules appeared for the first time after 25 cycles of reactor operation and their amount increased gradually during successive cycles. Mature granules had a fluffy surface resulting from filamentous bacteria presence. In all reactors efficiency of carbon removal remained at the level of 80%. Most of introduced COD was removed during the first 5 h of aeration according to I order reaction. COD removal rate was correlated with the organic load and varied from 123.12 to 472.76 mg COD l -1 h -1 .