Desinfecção de lodo de esgoto por meio de vermicompostagem.

Abstract

This vvork had, as objective the disinfection of the anaerobic mud originating frora of Anaerobic Digestores of Ascending Flow (DAFA), installed in PROSAB / Campina Grande-Pb, through the vermicompostagem with red earthworms of Califórnia. The experiment was accomplished during the period of June to October of 2002. The delineamento was in blocks entirely causalizados, in factorial outline [(3 x 2) + 1], acted by three humidities (60, 70 and 80%) and two composed of mud (anaerobic mud and mud sugarcane anaeróbio+bagaço), one more witness: absolute (anaerobic mud to 85%), with four repetitions. After the dehydration of the anaerobic mud. The vermicompostagem promoted the removal of the fecal coliformes in ali of the applied treatments. For the helmintos, the largest reduction was obtained when of the use of the subsrratum without sugarcane pulp, already in relation to the humidity tenor, the largest helmintos reduction was gotten her/it a humidity of 70%. as for the tenor certain metais in the samples of the vermicomposto, they were a lot below the permissible maximum for agricultural use of the mud (USEPA, 1992). it was also Observed that, at the end of the experiment the productivity of fetid Eisenia (red earthworm of Califónia) it was quite satisfactory in some treatments.