Abstract
The biodegradability of secondary alcohol ethoxylate has been already proved by various test methods. This paper is provided to show that secondary alcohol ethoxylate is by far easily degradable than nonylphenol ethoxylate in continuous-flow activated sludge system. The tests were conducted at higher concentration of surfactants than any previous works through long periods. In the test, biodegradabilities were followed by measuring COD (Cr), COD (Mn), cobalt thiocyanate active substances (CT AS) and TOC.
