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The impact of slowly biodegradable organic compounds on the oxygen uptake rate in activated sludge systems
Abstract
The hydrolysis process of slowly biodegradable substrate (Xs) have impact on the efficiencies of nutrient removal in activated sludge systems. Measurement of OUR and corresponding COD is accepted as a very useful tool to reflect the consumption of biodegradable substrates. The influence of the readily biodegradable substrate (Ss) in biological wastewater treatment systems has been extensively investigated, but little is known about the impact of Xs. The aim of this study was to determine the immediate effects of particulate and colloidal (Xs) biodegradable compounds on oxygen utilization for a full-scale process mixed liquor from large WWTP located in northern Poland. Since it is difficult to distinguish Xs in direct way, a novel procedure, based on the standard batch tests, was developed and run in parallel reactors with settled wastewater (SWW) and pretreated SWW sample. Two types of aerobic OUR tests with low and high substrat/biomass (So/Xo ratio) concentration, were carried out with the SWW without pretreatment and pretreated with coagulation-flocculation (C-F) method. The removal of colloidal and particulate fractions by C-F resulted in the reduced process rates. The major discrepancy in the rate reductions (over 300% referred to the OURmax) were observed during OUR batch test with high So/Xo ratio.
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- Category:
- Articles
- Type:
- artykuł w czasopiśmie wyróżnionym w JCR
- Published in:
-
WATER SCIENCE AND TECHNOLOGY
no. 69,
edition 6,
pages 1136 - 1144,
ISSN: 0273-1223 - Language:
- English
- Publication year:
- 2014
- Bibliographic description:
- Drewnowski J.: The impact of slowly biodegradable organic compounds on the oxygen uptake rate in activated sludge systems // WATER SCIENCE AND TECHNOLOGY. -Vol. 69, iss. 6 (2014), s.1136-1144
- DOI:
- Digital Object Identifier (open in new tab) 10.2166/wst.2013.771
- Verified by:
- Gdańsk University of Technology
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