| Title | Green solvent extraction of lipids from sewage sludge of wastewater treatment plants |
| Abstract | This study reports the analysis of lipids extraction from sewage sludge using ethyl esters of volatile fatty acids
(EEVFA). EEVFA are naturally occurring compounds, representing ones of the main constituents of flavour of fruits.
They can be considered bioderivable solvents, since industrially obtainable through direct esterification of ethanol and
VFAs, which can be both produced through fermentation of dedicated or exhausted feedstocks. In addition, they are easily
hydrolysable in an aqueous environment, by regenerating species of origin which are completely biodegradable. For all
these reasons, the use of EEVFA as extracting solvents would minimize the environmental impact respect with
conventional solvents (hexane is typically used). A theoretical thermodynamic study of the lipids extraction was
performed with an experimental matrix that emulated the chemical characteristics of a sewage sludge. This theoretical
study was performed to obtain the phase diagrams for the lipids extraction and to identify the optimum operating
conditions. A comparison of the lipids extraction using these green solvents and hexane was also performed. Then, the
optimum conditions were tested and validated on real samples of sewage sludge, sampled from different municipal
wastewater treatment plants. Theoretical thermodynamic studies, as well as experimental evidences confirmed that ethyl
butyrate was an alternative and effective green solvent to extract lipids from sewage sludge. |
| Source | Bulgarian Chemical Communications 51 |
| Keywords | Calcium soapssewage sludgegreen extractionvolatile fatty acidsethyl esters. |
| Journal | Bulgarian Chemical Communications |
| Editor | Bulgarian Academy of Sciences, Sofia, Bulgaria |
| Year | 2019 |
| Type | Articolo in rivista |
| DOI | 10.34049/bcc.51.B.018 |
| Authors | F.J. Villalobos-Delgado1, L. di Bitonto2, C. Pastore2*, H.E. Reynel-Ávila1,3, D.I. Mendoza-Castillo1,3, A. Bonilla-Petriciolet1 |
| Text | 421003 2019 10.34049/bcc.51.B.018 Calcium soaps sewage sludge green extraction volatile fatty acids ethyl esters. Green solvent extraction of lipids from sewage sludge of wastewater treatment plants F.J. Villalobos Delgado1, L. di Bitonto2, C. Pastore2 , H.E. Reynel Ávila1,3, D.I. Mendoza Castillo1,3, A. Bonilla Petriciolet1 1 Instituto Tecnologico de Aguascalientes, Av. Adolfo Lopez Mateos #1801 Ote., Aguascalientes 20256, Mexico 2 Water Research Institute IRSA , National Research Council CNR , via F. de Blasio 5, 70132 Bari, Italy 3 Catedras CONACYT Jovenes Investigadores, Ciudad de Mexico, 03940, Mexico This study reports the analysis of lipids extraction from sewage sludge using ethyl esters of volatile fatty acids EEVFA . EEVFA are naturally occurring compounds, representing ones of the main constituents of flavour of fruits. They can be considered bioderivable solvents, since industrially obtainable through direct esterification of ethanol and VFAs, which can be both produced through fermentation of dedicated or exhausted feedstocks. In addition, they are easily hydrolysable in an aqueous environment, by regenerating species of origin which are completely biodegradable. For all these reasons, the use of EEVFA as extracting solvents would minimize the environmental impact respect with conventional solvents hexane is typically used . A theoretical thermodynamic study of the lipids extraction was performed with an experimental matrix that emulated the chemical characteristics of a sewage sludge. This theoretical study was performed to obtain the phase diagrams for the lipids extraction and to identify the optimum operating conditions. A comparison of the lipids extraction using these green solvents and hexane was also performed. Then, the optimum conditions were tested and validated on real samples of sewage sludge, sampled from different municipal wastewater treatment plants. Theoretical thermodynamic studies, as well as experimental evidences confirmed that ethyl butyrate was an alternative and effective green solvent to extract lipids from sewage sludge. 51 Published version Articolo in rivista Bulgarian Academy of Sciences 0861 9808 Bulgarian Chemical Communications Bulgarian Chemical Communications Bulg. Chem. Commun. carlo.pastore PASTORE CARLO IProPBio Integrated Process and Product Design for Sustainable Biorefineries TA.P07.001.005 Recupero di risorse da rifiuti e biomasse |
