Potential Utilization of OECD 302 B Test in Biodegradability Assessment of Metalworking Fluids

Abstract:

The main aim of this study was to evaluate the ability of the activated sludge from sewage treatment plant to degrade a part of the 12 randomly selected metalworking fluids (MWFs) according to OECD 302B (with different addition of activated sludge AS 0.25 g/l, 0.50 g/l and 1.00 g/l of suspended solids - SS). The degradability test showed that, after the first 3 hours of cultivating, adsorption grew with the increasing amount of inoculums. In the case of AS addition 1.00 g/l of SS were the adsorption rate lower than 20 % in four samples, in the case of AS addition 0.50 g/l of SS in 9 samples and in the case of AS addition 0.25 g/l of SS in all 12 tested samples. In four samples were also observed the lag phase (adaptation of the bacterias to the presented carbon source). If occur adsorption rate more than 20% it is probably impossible to distinguish biological degradation of organic matter from abiotic elimination from the suspension.

• Periodical: Advanced Materials Research (Volumes 726-731)
• Pages: 2256-2259
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.726-731.2256
• Online since: August 2013
• Authors: Kristina Gerulova*, Jozef Fiala, Zuzana Szabova, Eva Buranská, Petra Paulocikova, Petra Bacigalova
• Keywords: Activated Sludge, Biodegradability Assessment, Metalworking Fluids

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