Abstract
AbstractField evaluation of the removal of linear alkylate sulfonate (LAS) detergents by the activated sludge process was carried out at the Kettle Moraine Boys舗 School near Plymouth, Wisconsin. The procedures and controls afforded by the school舗s central supply system along with its new and well‐operated 舠extended aeration舡 activated sludge plant, provided an excellent arrangement for controlled field comparison of the removal of LAS and ABS (alkyl benzene sulfonate) material. In addition, the sewage treatment plant was operated intentionally to produce poor results in order to observe the effects of such conditions on removals.Previous work showed that, with products containing ABS in use at the school, removals of methylene blue active substance could be expected to fall in the region of 75 to 85%. Removals with LAS material in use at the school were shown to be from 95 to 99% as long as the plant was operated satisfactorily. Further, the results showed that there was a strong correlation between LAS removal and BOD removal with a one to one slope.The results support the conclusion that for biological treatment processes, the removal of LAS material corresponds to the removal of BOD.
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