초록 ▼

A process for the decolorization of pulp mill process streams is described. The effluent from the process contains color bodies and organic materials, and is first fed to an acidification reactor where the pH is reduced. This causes a portion of the color bodies to precipitate. A flocculant is added

A process for the decolorization of pulp mill process streams is described. The effluent from the process contains color bodies and organic materials, and is first fed to an acidification reactor where the pH is reduced. This causes a portion of the color bodies to precipitate. A flocculant is added to coagulate the precipitated lignins, and the solution is filtered. The filtrate then passes through a series of chambers where it is contacted with activated carbon in an advanced separation device (ASD). The regeneration of the carbon occurs simultaneously in other chambers of the ASD. The treated filtrate with significantly lower color bodies passes out of the ASD in a substantially continuous stream.

대표청구항 ▼

A process for the decolorization of pulp mill effluent streams comprising: (a) acidifying the effluent to below pH 4.0, thereby precipitating color bodies from the effluent; (b) filtering the effluent; (c) conducting the filtrate through a carbon bed to adsorb organic compounds from the effluent ont

A process for the decolorization of pulp mill effluent streams comprising: (a) acidifying the effluent to below pH 4.0, thereby precipitating color bodies from the effluent; (b) filtering the effluent; (c) conducting the filtrate through a carbon bed to adsorb organic compounds from the effluent onto the carbon; and (d) regenerating the carbon by passing a caustic solution through the carbon bed.