Wastewater COD characterization: analysis of respirometric and physical-chemical methods for determining biodegradable organic matter fractions
✍ Scribed by Marcela N. Gatti; Francisca García-Usach; Aurora Seco; José Ferrer
- Publisher
- Wiley (John Wiley & Sons)
- Year
- 2010
- Tongue
- English
- Weight
- 214 KB
- Volume
- 85
- Category
- Article
- ISSN
- 0268-2575
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✦ Synopsis
BACKGROUND:
In this work, a comprehensive study of the respirometric and physical-chemical methods has been performed to evaluate the information provided by these two methodologies in order to assess the biodegradable organic matter fractions of wastewater. RESULTS: First, an analysis was performed of the influence of the initial substrate on biomass ratio (F 0 /X 0 ) in the assessment of readily biodegradable organic matter, S S , through respirometric experiments. In order to achieve an adequate assessment of the S S component, similar conditions (given by the initial F 0 /X 0 ratio) must be employed in experiments that are carried to determine S S and Y H (heterotrophic yield). Second, a comparative analysis of respirometric and physical-chemical methods was carried out. The respirometric analysis yielded a lower value of the S S component than the one using the physical-chemical method. Moreover, the respirometric analysis cannot measure the total content of slowly biodegradable organic matter, X S , since this method is only capable of determining the readily hydrolyzed biodegradable substrate. CONCLUSIONS: Considering the results, an adequate characterization method of the S S component has been proposed. This method provides readily and slowly hydrolyzable biodegradable organic matter fractions.