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5.2 Biodegradation

n-Butyraldehyde tested for biodegradability in several studies proved to be readily biodegradable:

Using an electrolytic respirometer and activated sludge under MITI(I) ready-biodegradability conditions, theoretical BODs of 46-57% of the Theoretical Oxygen Demand (ThOD) were observed after 90-135 h of incubation (approx. 4 - 6 days) (Urano and Kato 1986). Furthermore, 100% degradation of n-Butyraldehyde was recorded over a 2wk period (MITI test, corresponding to OECD Guideline 301C) (MITI 1992).

An anaerobic laboratory model for wastewater treatment systems using an enriched methanogenic baterial culture in a batch as well as in a continous-flow reactor demonstrated a degradation efficiency of 99% after a 7d lag period in batch culture and 82 % in the flow-through system after 52 days (Chou et al 1979).

Based on the inherent properties and ready biodegradability of n-Butyraldehyde in water, rapid elimination of the substance can also be predicted in compartments in sediment and soil by analogy.