Hygienization performances of innovative sludge treatment solutions to assure safe land spreading.

摘要: The present research aims at the evaluation of hygienization performances innovative sludge treatment processes applied for separated secondary sludge. Namely, two digestion pretreatments (sonication and thermal hydrolysis) sequential biological (mesophilic/thermophilic anaerobic/aerobic digestion) were compared to mesophilic (MAD) thermophilic anaerobic (TAD). Microbial indicators (Escherichia coli, somatic coliphages Clostridium perfringens spores) pathogens (Salmonella enteroviruses), which show different resistances processes, monitored in untreated treated Overall, microbial load was shown be similar or lower than previously reported literature mixed Notably, process increased removal E. coli simple MAD always achieved requirement (2-log-unit coli) proposed by EU Commission 3rd Working Document on (April 2000) use sludges agriculture with restriction their application. quality limits unrestricted (no Salmonella 50 g wet weight (WW) <500 CFU/g) met when pretreatment applied; however, required level (6-log-unit could not assessed due low this microorganism raw Observed levels indicator showed a higher resistance viral particles bacterial cells confirmed suitability as processes.