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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
Contained in: Waste and Biomass Valorization [Dordrecht] : Springer Netherlands Vol. 7, No. 4 (2016), p. 667-675
Journal Title: Waste and Biomass Valorization
Fulltext access:
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Links: Volltext (dx.doi.org)
ISSN: 1877-265X
Additional Keywords: Alkali
Anaerobic digestion
Economic feasibility
Low-temperature
OriginalPaper
Pre-treatments
Waste activated sludge
DOI: 10.1007/s12649-016-9537-x
Language: English
Physical Description: Online-Ressource
ID (e.g. DOI, URN): 10.1007/s12649-016-9537-x
s12649-016-9537-x
PPN (Catalogue-ID): SPR056468326
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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 °C). 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 °C 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. 
653 |a OriginalPaper 
653 |a Anaerobic digestion 
653 |a Waste activated sludge 
653 |a Pre-treatments 
653 |a Alkali 
653 |a Low-temperature 
653 |a Economic feasibility 
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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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