Fatty Alcohol Ether Research Articles

On the behaviour of synthetic organic substances during the treatment of waste liquors—IV: Progress of the biodegradation of “soft” anionic synthetic detergents

The biodegradation of anionic synthetic detergents with a linear alkyl chain has been followed in laboratory activated sludge units. It was found by comparing the concentration of the methylene blue active substance (MBAS) remaining in the effluent, with the appertaining values for total organic carbon (TOC) and dichromate value (DV), respectively, that the degradation of the detergent molecule did not coincide with the MBAS degradation. Generally, these indirect methods gave a lower rate of degradation. Thus, the presence of intermediates, which are not accounted for in the MBAS-analysis, is postulated. A higher proportion of intermediates are formed with alkylbenzene sulfonates (LAS) than with alkyl sulfates, alkyl sulfonates and fatty alcohol ether sulfates, intermediates are produced to a greater extent as the detergent concentration increases. Therefore LAS-detergents should be described as of medium biodegradability for practical purposes.

界面活性剤による鮮魚の細菌除去に関する研究

1. The cleaning effect on jack mackerel (Trachurus trachurus) was examined with different surface active agents, such as sodium linear alkylbenzene sulfonate (LAS), sucrose fatty acid ester (SE), and polyoxyethylene (9) fatty alcohol (C16-18) ether (PEFA). The surface active agents were dissolved in phosphate-citric acid buffer of different pH values. 2. Cleaning of fish with PEFA and LAS at pH 5.0 resulted in a clean surface appearance and the removal of unpleasant fishy odour. But the skin surface treated with LAS turned buff colour within 1-2 days after cleaning. 3. Viable bacterial counts on the skin surface decreased to 1/100-1/1000 after cleaning with PEFA solution at pH 5.0. No other surface active agents tested showed similar effect.