Abstract
Electroosmotic dewatering of water treatment process sludge, in which a relatively high specific resistance causes difficulties in water removal, is described. The dewatering is accelerated and economically attractive by additives which increase the abs. value of the z potential but do not lead to stable suspensions. An increase in z potential means an increase in electroosmotic water transport; simultaneously elec. charges on the filter repel particles with elec. charges of the same sign, which causes a decrease in the clogging of the filtration material. Results show the final dry solid content increases from 4%, by pressure filtration only, to 16% (by wt.) by a combination of electroosmosis with pressure filtration. [on SciFinder (R)]