| 摘要 |
<p>A method of cleaning waste water and removing contaminants therefrom with respect to compositions exhibiting water solubility behaviour which is pH dependent. The method includes the preliminary step of applying the composition at a pH at which the composition is water insoluble, then removing excess composition from application equipment with a wash solution having a pH at which the composition is water soluble or washable, changing the pH of the wash solution to a pH at which the composition is water insoluble to thereby precipitate the composition and removing the composition by filtration or other separation techniques. The invention also relates to a shop towel clean up method.</p> |
