Cellulosic adsorbents (T and H type. See Experimental for the symbols.) prepared by crosslinking industrial or domestic wastes and another C
A type adsorbent made from partially aldehydized cellulose and chitosan, were applied for the advanced treatment of colored wastewater. Typical adsorbents are TChP, C
A N and (TChP)
GA, a modification of TChP by gelatin coating. Although these adsorbents had pore size distributions 5-5000nm, coloring matters in wastewater were found to be adsorbed in the transitional pores of 5-500nm.
The rates of adsorption of negatively charged coloring matters by these adsorbents were higher than those by an activated carbon and by a typical polymer adsorbent. Furthermore, the absorption capacities of these adsorbents for coloring matters in model and secondary treated dyehouse waste-waters were generally excellent.
A newly constructed apparatus, a continuous countercurrent solid-liquid contactor with four horizontal troughs, was found to be well suited for the decolorization of secondary treated waste-water by the adsorbents; e. g., (TChP)
GA could be effectively and continuously used over a few months by repeating the processes, adsorption, regeneration and rinsing.
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