| Title | Quality assessment of digested sludges produced by advanced stabilization processes |
| Abstract | The European Union (EU) Project Routes aimed to discover new routes in sludge stabilization treatments leading to high-quality digested sludge, suitable for land application. In order to investigate the impact of different enhanced sludge stabilization processes such as (a) thermophilic digestion integrated with thermal hydrolysis pretreatment (TT), (b) sonication before mesophilic/thermophilic digestion (UMT), and (c) sequential anaerobic/aerobic digestion (AA) on digested sludge quality, a broad class of conventional and emerging organic micropollutants as well as ecotoxicity was analyzed, extending the assessment beyond the parameters typically considered (i.e., stability index and heavy metals). The stability index was improved by adding aerobic posttreatment or by operating dual-stage process but not by pretreatment integration. Filterability was worsened by thermophilic digestion, either alone (TT) or coupled with mesophilic digestion (UMT). The concentrations of heavy metals, present in ranking order Zn > Cu > Pb > Cr ~ Ni > Cd > Hg, were always below the current legal requirements for use on land and were not removed during the processes. Removals of conventional and emerging organic pollutants were greatly enhanced by performing double-stage digestion (UMT and AA treatment) compared to a single-stage process as TT; the same trend was found as regards toxicity reduction. Overall, all the digested sludges exhibited toxicity to the soil bacterium Arthrobacter globiformis at concentrations about factor 100 higher than the usual application rate of sludge to soil in Europe. For earthworms, a safety margin of factor 30 was generally achieved for all the digested samples. © 2014 Springer-Verlag Berlin Heidelberg. |
| Source | Environmetal science and pollution research international (Internet) 22 (10), pp. 7216–7235 |
| Keywords | AgricultureEcotoxicityEnhanced stabilization processesHeavy metalsOrganic pollutantsSewage sludge |
| Journal | Environmetal science and pollution research international (Internet) |
| Editor | Springer, Berlin, Germania |
| Year | 2015 |
| Type | Articolo in rivista |
| DOI | 10.1007/s11356-014-3090-6 |
| Authors | Braguglia C.M.; Coors A.; Gallipoli A.; Gianico A.; Guillon E.; Kunkel U.; Mascolo G.; Richter E.; Ternes T.A.; Tomei M.C.; Mininni G. |
| Text | 300311 2015 10.1007/s11356 014 3090 6 Agriculture Ecotoxicity Enhanced stabilization processes Heavy metals Organic pollutants Sewage sludge Quality assessment of digested sludges produced by advanced stabilization processes Braguglia C.M.; Coors A.; Gallipoli A.; Gianico A.; Guillon E.; Kunkel U.; Mascolo G.; Richter E.; Ternes T.A.; Tomei M.C.; Mininni G. Istituto di Ricerca sulle Acque CNR, Area della Ricerca RM1, Monterotondo, Rome, Italy; ECT Oekotoxikologie, Florsheim/Main, Germany; ICMR UMR CNRS 7312, Universite de Reims Champagne Ardenne, Reims, France; Federal Institute of Hydrology BfG , Koblenz, Germany; Istituto di Ricerca sulle Acque CNR, Bari, Italy The European Union EU Project Routes aimed to discover new routes in sludge stabilization treatments leading to high quality digested sludge, suitable for land application. In order to investigate the impact of different enhanced sludge stabilization processes such as a thermophilic digestion integrated with thermal hydrolysis pretreatment TT , b sonication before mesophilic/thermophilic digestion UMT , and c sequential anaerobic/aerobic digestion AA on digested sludge quality, a broad class of conventional and emerging organic micropollutants as well as ecotoxicity was analyzed, extending the assessment beyond the parameters typically considered i.e., stability index and heavy metals . The stability index was improved by adding aerobic posttreatment or by operating dual stage process but not by pretreatment integration. Filterability was worsened by thermophilic digestion, either alone TT or coupled with mesophilic digestion UMT . The concentrations of heavy metals, present in ranking order Zn > Cu > Pb > Cr Ni > Cd > Hg, were always below the current legal requirements for use on land and were not removed during the processes. Removals of conventional and emerging organic pollutants were greatly enhanced by performing double stage digestion UMT and AA treatment compared to a single stage process as TT; the same trend was found as regards toxicity reduction. Overall, all the digested sludges exhibited toxicity to the soil bacterium Arthrobacter globiformis at concentrations about factor 100 higher than the usual application rate of sludge to soil in Europe. For earthworms, a safety margin of factor 30 was generally achieved for all the digested samples. © 2014 Springer Verlag Berlin Heidelberg. 22 Published version http //www.scopus.com/inward/record.url eid=2 s2.0 84901734790 partnerID=q2rCbXpz Quality assessment of digested sludges produced by advanced stabilization processes quality assessment, 2015.pdf Articolo in rivista Springer 1614 7499 Environmetal science and pollution research international Internet Environmetal science and pollution research international Internet Environ. sci. pollut. res. int. Internet Environmental science and pollution research international. Internet Environmental science and pollution research Internet Internet ESPR Internet Internet agata.gallipoli GALLIPOLI AGATA camillamaria.braguglia BRAGUGLIA CAMILLA MARIA giuseppe.mininni MININNI GIUSEPPE andrea.gianico GIANICO ANDREA mariaconcetta.tomei TOMEI MARIA CONCETTA giuseppe.mascolo MASCOLO GIUSEPPE ROUTES Novel processing routes for effective sewage sludge management TA.P07.001.005 Recupero di risorse da rifiuti e biomasse |
