| 摘要 |
<p>The invention relates to a process for checking the saturation level of activated carbon filters in the purification of waste-water containing organic chemicals, which comprises a) adding to the waste-water one or more than one colourless, water-soluble, primary aromatic amine and then passing said waste-water over the activated carbon filter, or first loading the activated carbon filter with said colourless, water-soluble primary aromatic amine and afterwards passing the waste-water over said activated carbon filter, b) taking a portion of the filtrate, diazotising the aromatic amine and forming an azo dye with a water-soluble aromatic coupling component, and thereafter c) determining the colour of the filtrate. The process is suitable for purifying waste-waters originating from animal dips, spray mixtures for treating plants, and from chemical production and laboratories.</p> |
