Abstract

Alternative approaches for obtaining biodiesel from municipal sludge have been successfully investigated.In order to avoid the expensive conventional preliminary step of sludge drying, dewatered sludge(TSS: 15 wt%) was used as starting material. The best performance in terms of yield of fatty acid methylesters (18 wt%) with the lowest energy demand (17 MJ kg1FAME) was obtained by a new two-step approachbased on hexane extraction carried out directly on dewatered acidified (H2SO4) sludge followed by methanolysisof extracted lipids. It was found that sulphuric acid plays a key role in the whole process not onlyfor the transesterification of glycerides but also for the production of new free fatty acids from soaps andtheir esterification with methanol. In addition to biodiesel production, the investigated process allowsvalorization of primary sludge as it turns it into a valuable source of chemicals, namely sterols(2.5 wt%), aliphatic alcohols (0.8 wt%) and waxes (2.3 wt%).

Autore Pugliese

• Pastore Carlo , Mascolo Giuseppe

Tutti gli autori

• Pastore C.; Lopez A.; Lotito V.; Mascolo G.

Titolo volume/Rivista

Chemosphere

Anno di pubblicazione

2013

ISSN

0045-6535

ISBN

Non Disponibile

Numero di citazioni Wos

Nessuna citazione

Ultimo Aggiornamento Citazioni

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Numero di citazioni Scopus

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Ultimo Aggiornamento Citazioni

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Settori ERC

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Codici ASJC

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