| 摘要 |
<p>Industrial effluents containing suspended solids, e.g. paper fibres, and a surface-active agent are flocculated by treating to change the pH by two units in one direction followed by a change of two units in the opposite direction. Flocculation agents may also be added. The flocs may be separated by bubbling gases through the treated effluents.ALSO:Waste paper is treated with detergents (surface active agents) and pulped to separate the ink from the fibres. After dilution, washing, thickening and acidification the pulp is turned into a web. The effluent containing the ink is treated to change the pH by two in one direction followed by a change of pH of two in the opposite direction and thus flocculate the solids. The purified water is returned to the deinking stage.</p> |
