Physicochemical Pretreatment of Contaminated Microfibre Cloths after Their Use in Waterless Car Wash / Ar virsmas aktīvām vielām piesārņotu bezūdens automašīnu tīrīšanas mikrošķiedru audumu fizikāli-ķīmiskā priekšapstrāde.

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Contaminated microfibre cloths (80 % polyester and 20 % polyamide) which were previously used in waterless car cleaning process were treated in ultrasonic bath. Efficiency of water, ethanol, 2-propanol and ethylene glycol as liquid phase for ultrasonic treatment was compared. Chemical oxygen demand (COD), concentration of surfactants and total nitrogen in the extract were tested after 0 min, 10 min, 30 min and 60 min ultrasonic (US) exposure (42 kHz). In all cases the COD values gradually increased in a time dependent manner from 6 % to 35 % with ethanol, from 17 % to 37 % with ethyleneglycol and from 17 % to 33 % with 2-propanol at 10 to 60 min US mode, respectively.

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