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Preliminary Technical and Economic Analysis of Alkali and Low Temperature Thermo-alkali Pretreatments for the Anaerobic Digestion of Waste Activated Sludge

Waste activated sludge (WAS) contains various organic and inorganic substances that should be treated for a safe disposal. Anaerobic digestion is the most widely accepted method for stabilizing WAS. This work presents preliminary results concerning the technical and economic feasibility of alkali an... Full description

Main Author: Ruffino, Barbara
Contributors: Campo, Giuseppe | Author
Cerutti, Alberto | Author
Zanetti, Mariachiara | Author
Lorenzi, Eugenio | Author
Scibilia, Gerardo | Author
Genon, Giuseppe | Author
Kongresse: International Conference on Sustainable Solid Waste Management 3 2015.07.02-2015.07.04 Tinos Island, GR
TINOS 3 2015.07.02-2015.07.04 Tinos Island, GR
International Conference on Sustainable Solid Waste Management 3rd 2015.07.02-2015.07.04 Tinos Island, GR
TINOS 2015 2015.07.02-2015.07.04 Tinos Island, GR
Contained in: Waste and Biomass Valorization Vol. 7, No. 4 (2016), p. 667-675
Fulltext access:
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Interlibrary loan: Check possibility for interlibrary loan
Links: Additional Link (dx.doi.org)
ISSN: 1877-2641
Additional Keywords: ANAEROBER-PROZESS
BIOGAS
METHAN
NIEDRIGTEMPERATUR
ORGANISCHE-SUBSTANZ
PH-WERT
UEBERSCHUSSSCHLAMM
WIRTSCHAFTSANALYSE
DOI: 10.1007/s12649-016-9537-x
Language: English
Notes: Copyright: Metadaten: TEMA, Copyright WTI-Frankfurt eG
Copyright: (C) Alle Rechte beim Herausgeber
Physical Description: 9 Seiten, 31 Quellen
ID (e.g. DOI, URN): 10.1007/s12649-016-9537-x
PPN (Catalogue-ID): WTI002137518
Note: WTI TEMA DB
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Internes Format
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245 1 0 |a Preliminary Technical and Economic Analysis of Alkali and Low Temperature Thermo-alkali Pretreatments for the Anaerobic Digestion of Waste Activated Sludge  |h Elektronische Ressource 
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520 |a Waste activated sludge (WAS) contains various organic and inorganic substances that should be treated for a safe disposal. Anaerobic digestion is the most widely accepted method for stabilizing WAS. This work presents preliminary results concerning the technical and economic feasibility of alkali and hybrid thermo-alkali pretreatments for the improvement of WAS anaerobic digestion. Chemicals used for pretreatments were NaOH and Ca(OH)2, with doses in the range of 0.04-0.2 g alkali/g TS. The same substances were used for hybrid pretreatments at low temperature (70 and 90 ÖʿC). Test outcomes demonstrated that NaOH was a more performing chemical in sludge disintegration and COD liberation than Ca(OH)2. NaOH showed good performances already at low doses (0.08 g NaOH/g TS) with disintegration rates in the order of 20 %. Thermal effect improved alkali performance, in fact the biogas yield increased of 13.2 and 26.8 % when samples were treated respectively at 20 and 70 ÖʿC with 0.04 g NaOH/g TS for 90 min. However, until nowadays economic issues (mainly the cost of chemicals for alkali pretreatments and pH conditioning) have limited the real-world applications of alkali and hybrid pretreatments. The preliminary economic analysis performed in this work demonstrated that, if the pretreatment was carried out with a dose of alkali of 0.08 g NaOH/g TS, only an increase in the methane yield in the order of 60 % could offset the cost of chemicals. On the other hand, if the alkali dose was of only 0.04 g NaOH/g TS, increases in the methane yields in the order of 15-20 % were sufficient. 
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700 1 |a Campo, Giuseppe  |e verfasserin  |4 aut 
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700 1 |a Zanetti, Mariachiara  |e verfasserin  |4 aut 
700 1 |a Lorenzi, Eugenio  |e verfasserin  |4 aut 
700 1 |a Scibilia, Gerardo  |e verfasserin  |4 aut 
700 1 |a Genon, Giuseppe  |e verfasserin  |4 aut 
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711 2 |a TINOS  |n 2015  |d 2015.07.02-2015.07.04  |c Tinos Island, GR 
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