Abstract

The removal of fulvic acid by means of aluminum salts and a nonionic polymer (nonionic polyacrylamide) was investigated in accordance with jar test procedures. Both aluminum chloride and aluminum sulfate demonstrated similar efficiencies in removing fulvic acid from water. Removals after nitration were highest at the lowest pH studied (pH ~ 6) and depending on the aluminum dose, removals up to 10')% were observed. The settleability of the flocs, however, was very poor. Only for the highest Al done employed (0 5 v 10-3M) and for the AlCl3 case, removals higher than 80 percent after 20 minutes of settling were observed.

The presence of the polymer enhanced both the settleability of the flocs and the removals after filtration. The latter was attributed to the flocculation of the micro-colloidal particles that passed through the pores of the filter in the absence of the polymer.

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