An environmental application of functionalized chitosan: enhancement of the separation of the solid and liquid fractions of digestate from anaerobic digestion

Author:

David Ghislain1,Negrell Claire1,Vachoud Laurent2,Ruiz Emilie2,Delalonde Michèle2,Wisniewski Christelle2

Affiliation:

1. 1Institut Charles Gerhardt, Montpellier, UMR CNRS 5253, Equipe Ingénierie et Architectures Macromoléculaires, Ecole Nationale Supérieure de Chimie de Montpellier, 8 rue de l’école normale, 34296 Montpellier Cedex 5, France

2. 2UMR QualiSud, UMR Cirad 95, UFR des Sciences Pharmaceutiques et Biologiques, Université de Montpellier, 15 Avenue Charles Flahault, B.P. 14 491, 34 093 Montpellier Cedex 5, France

Abstract

AbstractA high molecular weight chitosan was chemically modified to quantitatively incorporate quaternary ammonium groups. Its efficiency was evaluated in the liquid-solid separation for various liquors, and compared with the one of a polyelectrolyte usually used for this utilization. The performance of the liquid-solid separation was estimated through the determination of two parameters measured after the screening- settling of the mixture liquor/flocculating agent: the separation efficiency (EV) and the TS removal efficiency (ETS). Apart for liquor 6, TS removal was always better after an addition of functionalized chitosan. Furthermore, whatever the type of liquor, the distribution was modified by an increased presence of high-size particles when functionalized chitosan was added. Moreover, chitosan addition tended to homogenize the size of the particles, which could facilitate the choice of the liquid-solid separation process. This homogenization was particularly observed for the liquor initially highly dispersed in size, i.e. liquors 1, 4, 6 and 8.

Publisher

Walter de Gruyter GmbH

Subject

General Chemical Engineering,General Chemistry

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