Folder Anaerobic biodegradation test under sludge digester conditions (AnBUSDiC)


pdf Anaerobic Biodegradation of Surfactants - Scientific Review

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Tenside Review article - Abstract.pdf

Abstract Background: The anaerobic biodegradation of surfactants is used as an acceptability criterion in some environmental legislations without a proper evaluation of the relevance of such a characteristic.

pdf Optimierung der experimentellen Rahmenbedingungen zur Ermittlung des anaeroben biologischen Abbaus von Tensiden

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Abschlussbericht für ein Pilot-Projekt Optimierung der experimentellen Rahmenbedingungen zur Ermittlung des anaeroben biologischen Abbaus von Tensiden. Der vorliegenden Arbeiten wurden von einer TEGEWA ad-hoc Arbeitsgruppe erarbeitet. Mitglieder der Gruppe waren

pdf Optimisation of the Experimental Conditions for the Anaerobic Biodegradation of Surfactants – Final Report of the TEGEWA ad-hoc Working Group

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Anaerobic Biodegradability of organic compounds in digested sludge by measurement of gas production, as described in the OECD test guidelines No. 311, has severe limitations, specifically that it is time consuming, difficult to handle, and - most importantly - prone to false negative results.

pdf Ring testing of the AnBUSDiC test; a new screening method for the anaerobic degradability of surfactants

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Background: Surfactants are widely used across the globe both in industrial and consumer products; their biodegradation characteristics are therefore of high importance. Upon entering a wastewater treatment plant (WWTP), the majority of surfactants are aerobically mineralized to CO2 and H2O. However, a small fraction is inevitably left non-degraded and adheres to the remaining sludge. This sludge is usually further treated in anaerobic digester tanks. Assessment of existing methods for determining anaerobic biodegradability has led to the development of a new test method, which is in principle based on the method DIN 38414 part 8. This new test, named the anaerobic biodegradation under sludge digester conditions test (abbreviated to AnBUSDiC test) allows for a quantification of the degradation of surfactants under conditions encountered in the anaerobic digester tank of municipal WWTPs. The AnBUSDiC test has several advantages over existing methods. The main advantage is that it is particularly suitable for surfactants, because the two-step design minimizes possible unspecific digester gas formation caused by the surface activity of the test substances, therefore avoiding false positive results.
Results: In order to further standardize the AnBUSDiC test and gain regulatory acceptance, a ring test was organized involving seven laboratories, and five model surfactants from different surfactant classes (anionic, non-ionic (branched and linear) and amphoteric) plus a positive control, glucose. The AnBUSDiC test produced reliable repeatable results between laboratories; however, some additional modifications were suggested. It was identified that the original test method did not identify a clear endpoint from which a biodegradation value should be taken.
It was proposed that a new more concise endpoint be defined in combination with the AnBUSDiC test to allow better comparability between test results.
Conclusions: The inclusion of a second addition of test substance is a major step forward in the elimination of the variability produced by non-specific gas production. With the exception of one anomalous result for linear alkylbenzene sulfonates, for which an explanation can be provided, the AnBUSDiC method appears to provide overall robust and interpretable results.

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