Scheda di dettaglio – i prodotti della ricerca
| Dato | Valore |
|---|---|
| Title | Hygienization performances of innovative sludge treatment solutions to assure safe land spreading |
| Abstract | The present research aims at the evaluation of the hygienization performances of innovative sludge treatment processes applied for the separated treatment of secondary sludge. Namely, two digestion pretreatments (sonication and thermal hydrolysis) and two sequential biological processes (mesophilic/thermophilic and anaerobic/aerobic digestion) were compared to the mesophilic (MAD) and thermophilic anaerobic digestion (TAD). Microbial indicators (Escherichia coli, somatic coliphages and Clostridium perfringens spores) and pathogens (Salmonella and enteroviruses), which show different resistances to treatment processes, were monitored in untreated and treated sludge. Overall, microbial load in secondary sludge was shown to be similar or lower than previously reported in literature for mixed sludge. Notably, the anaerobic/aerobic digestion process increased the removal of E. coli and somatic coliphages compared to the simple MAD and always achieved the hygienization requirement (2-log-unit removal of E. coli) proposed by EU Commission in the 3rd Working Document on sludge (April 2000) for the use of treated sludges in agriculture with restriction on their application. The microbial quality limits for the unrestricted use of sludge in agriculture (no Salmonella in 50 g wet weight (WW) and E. coli <500 CFU/g) were always met when thermal digestion or pretreatment was applied; however, the required removal level (6-log-unit removal of E. coli) could not be assessed due to the low level of this microorganism in raw sludge. Observed levels of indicator removal showed a higher resistance of viral particles to thermal treatment compared with bacterial cells and confirmed the suitability of somatic coliphages as indicators in thermal treatment processes. |
| Source | Environmental science and pollution research international 22 (10), pp. 7237–7247 |
| Keywords | Sludge hygienizationC. perfringensSomatic coliphagesEnterovirusPretreatmentsSalmonellaAerobic stabilizationAnaerobic digestionSewage sludge |
| Journal | Environmental science and pollution research international |
| Editor | Springer, Berlin, Germania |
| Year | 2014 |
| Type | Articolo in rivista |
| DOI | 10.1007/s11356-014-3572-6 |
| Authors | Levantesi, Caterina; Beimfohr, Claudia; Blanch, Anicet R.; Carducci, A.; Gianico, A.; Lucena, Francisco D.; Tomei, Maria Concetta; Mininni, Giuseppe |
| Text | 300819 2014 10.1007/s11356 014 3572 6 Scopus 2 s2.0 84908518690 Sludge hygienization C. perfringens Somatic coliphages Enterovirus Pretreatments Salmonella Aerobic stabilization Anaerobic digestion Sewage sludge Hygienization performances of innovative sludge treatment solutions to assure safe land spreading Levantesi, Caterina; Beimfohr, Claudia; Blanch, Anicet R.; Carducci, A.; Gianico, A.; Lucena, Francisco D.; Tomei, Maria Concetta; Mininni, Giuseppe Consiglio Nazionale delle Ricerche; Vermicon AG; Universitat de Barcelona The present research aims at the evaluation of the hygienization performances of innovative sludge treatment processes applied for the separated treatment of secondary sludge. Namely, two digestion pretreatments sonication and thermal hydrolysis and two sequential biological processes mesophilic/thermophilic and anaerobic/aerobic digestion were compared to the mesophilic MAD and thermophilic anaerobic digestion TAD . Microbial indicators Escherichia coli, somatic coliphages and Clostridium perfringens spores and pathogens Salmonella and enteroviruses , which show different resistances to treatment processes, were monitored in untreated and treated sludge. Overall, microbial load in secondary sludge was shown to be similar or lower than previously reported in literature for mixed sludge. Notably, the anaerobic/aerobic digestion process increased the removal of E. coli and somatic coliphages compared to the simple MAD and always achieved the hygienization requirement 2 log unit removal of E. coli proposed by EU Commission in the 3rd Working Document on sludge April 2000 for the use of treated sludges in agriculture with restriction on their application. The microbial quality limits for the unrestricted use of sludge in agriculture no Salmonella in 50 g wet weight WW and E. coli <500 CFU/g were always met when thermal digestion or pretreatment was applied; however, the required removal level 6 log unit removal of E. coli could not be assessed due to the low level of this microorganism in raw sludge. Observed levels of indicator removal showed a higher resistance of viral particles to thermal treatment compared with bacterial cells and confirmed the suitability of somatic coliphages as indicators in thermal treatment processes. 22 Published version http //link.springer.com/article/10.1007%2Fs11356 014 3572 6 First online 20 September 2014 Hygienization performances of innovative sludge treatment solutions to assure safe land spreading pdf pubblicazione 2014_Levantesi_et_al.pdf Articolo in rivista Springer 0944 1344 Environmental science and pollution research international Environmental science and pollution research international Environ. sci. pollut. res. int. Environmental science and pollution research international. Environmental science and pollution research international Print Environmental science and pollution research Print ESPR Print caterina.levantesi LEVANTESI CATERINA giuseppe.mininni MININNI GIUSEPPE andrea.gianico GIANICO ANDREA mariaconcetta.tomei TOMEI MARIA CONCETTA ROUTES Novel processing routes for effective sewage sludge management |