Abstract
This study concerns the effectiveness of helminth eggs elimination during co-composting of activated sludge from a wastewater treatment plant mixed with ligno-cellulosic waste in a ratio of either 1/3-2/3 or 1/2-1/2 for 180 days. The Analysis of the initial sludge showed a load of 4-27 nematode eggs /g fresh matter identified as Ascaris sp., Capillaria sp. and Trichuris sp. During the co-composting stabilization phase, the reduction of the number of eggs varied between 50 and 90%. At the end of the process, reduction reached 100% for all the helminth ova. These results confirm the effectiveness of co-composting on their removal. Thereby, the final compost complied with the WHO guidelines for the safe reuse of fecal sludge.
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