Microbiological analysis of biosolids treated with different techniques for agricultural use

Microbiological analysis of four biosolid samples (A, B, C, D) was carried out in accordance with current regulations. In addition, microbiological tests were performed on water, with percentage of untreated biosolid (E) and on water with sludge treated with microalgae (F) after a period of 42 days. The results obtained show that samples B, C and D were within the L.M.P., sample A was found to be above with respect to Salmonella spp., with 1,100,000 NMP/g ST of Fecal Coliforms, 1,100,000 NMP/g ST of Salmonella spp., and 1 helminth egg in 2 g ST. Salmonella spp. was present in samples E and F. Subsequently, an analysis was carried out on a sample of sorghum and another of corn treated with biosolid for germination and growth, obtaining results of 250,000 CFU/g and 2,200,000 CFU/g respectively.