| Title | Innovative two-stage mesophilic/thermophilic anaerobic degradation of sonicated sludge: performances and energy balance |
| Abstract | This study investigates for the first time, on laboratory
scale, the possible application of an innovative enhanced
stabilization process based on sequential mesophilic/
thermophilic anaerobic digestion of waste-activated sludge,
with low-energy sonication pretreatment. The first mesophilic
digestion step was conducted at short hydraulic retention time
(3-5 days), in order to favor volatile fatty acid production,
followed by a longer thermophilic step of 10 days to enhance
the bioconversion kinetics, assuring a complete pathogen
removal. The high volatile solid removals, up to 55 %, noticeably
higher compared to the performances of a single-stage
process carried out in same conditions, can guarantee the
stability of the final digestate for land application. The ultrasonic
pretreatment influenced significantly the fatty acid formation
and composition during the first mesophilic step,
improving consequently the thermophilic conversion of these
compounds into methane. Methane yield from sonicated
sludge digestion reached values up to 0.2 Nm3/kgVSfed. Positive
energy balances highlighted the possible exploitation of
this innovative two-stage digestion in place of conventional
single-stage processes. |
| Source | Environmental science and pollution research international 22 (10), pp. 7248–7256 |
| Keywords | Energy balanceMethaneMultistage digestionOrganic loading rateUltrasoundsVolatile fatty acidsWaste-activated sludge |
| Journal | Environmental science and pollution research international |
| Editor | Springer, Berlin, Germania |
| Year | 2015 |
| Type | Articolo in rivista |
| DOI | 10.1007/s11356-014-3123-1 |
| Authors | Gianico, A.; Braguglia, Camilla Maria; Gallipoli, Agata; Mininni, Giuseppe |
| Text | 300824 2015 10.1007/s11356 014 3123 1 Scopus 2 s2.0 84901733857 Energy balance Methane Multistage digestion Organic loading rate Ultrasounds Volatile fatty acids Waste activated sludge Innovative two stage mesophilic/thermophilic anaerobic degradation of sonicated sludge performances and energy balance Gianico, A.; Braguglia, Camilla Maria; Gallipoli, Agata; Mininni, Giuseppe Water Research Institute, IRSA CNR, Area della Ricerca RM1, Via Salaria km 29.300, 00015, Monterotondo Rome, Italy This study investigates for the first time, on laboratory scale, the possible application of an innovative enhanced stabilization process based on sequential mesophilic/ thermophilic anaerobic digestion of waste activated sludge, with low energy sonication pretreatment. The first mesophilic digestion step was conducted at short hydraulic retention time 3 5 days , in order to favor volatile fatty acid production, followed by a longer thermophilic step of 10 days to enhance the bioconversion kinetics, assuring a complete pathogen removal. The high volatile solid removals, up to 55 %, noticeably higher compared to the performances of a single stage process carried out in same conditions, can guarantee the stability of the final digestate for land application. The ultrasonic pretreatment influenced significantly the fatty acid formation and composition during the first mesophilic step, improving consequently the thermophilic conversion of these compounds into methane. Methane yield from sonicated sludge digestion reached values up to 0.2 Nm3/kgVSfed. Positive energy balances highlighted the possible exploitation of this innovative two stage digestion in place of conventional single stage processes. 22 Published version http //www.scopus.com/record/display.url eid=2 s2.0 84901733857 origin=inward Innovative two stage mesophilic/thermophilic anaerobic degradation of sonicated sludge performances and energy balance articolo in rivista Gianico et al., 2014.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 agata.gallipoli GALLIPOLI AGATA camillamaria.braguglia BRAGUGLIA CAMILLA MARIA giuseppe.mininni MININNI GIUSEPPE andrea.gianico GIANICO ANDREA TA.P07.001.005 Recupero di risorse da rifiuti e biomasse |
