The biodegradability of two primary alcohol ethoxylate nonionic surfactants under practical conditions,and the toxicity of the biodegradation products to rainbow trout |
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Authors: | AH Turner FS Abram VM Brown HA Painter |
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Affiliation: | 1. Shell Chemicals U.K. Ltd, 1 Northumberland Avenue, Trafalgar Square, London WC2N 5LA UK;2. Water Research Centre, Elder Way, Stevenage, Herts SGI 1TH, England |
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Abstract: | A field trial has been performed to measure the biodegradability of two typical alcohol ethoxylate nonionic surfactants, “Dobanol” 45-7 and “Dobanol” 45-11, by dosing them to biological filters in a mixture with domestic sewage. Influent levels were 10 and 25 mg l?1 of each surfactant and 96–98% degradation was achieved within a temperature range of 5–10°C. The surfactants had no adverse effects on the filters in terms of the usual sanitary parameters (BOD, COD, TOC and ammoniacal nitrogen). Tests on the effluents indicated no residual acute lethal toxicity to rainbow trout Salmo gairdneri). |
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Keywords: | biodegradation nonionics alcohol ethoxylate toxicity trout field trial sewage treatment biodegradation intermediates |
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