Chemical and physical properties of alginate-like exopolymers of aerobic granules and flocs produced from different wastewaters. (September 2020)

• Record Type: Journal Article
• Authors: Schambeck, Cássio Moraes; Girbal-Neuhauser, Elisabeth; Böni, Lukas; Fischer, Peter; Bessière, Yolaine; Paul, Etienne; da Costa, Rejane Helena Ribeiro; Derlon, Nicolas
• Is Part Of: Bioresource technology. Volume 312(2020)
• Publication Date: 2020-09
• Subjects: Waste biological sludge -- Aerobic granular sludge (AGS) -- Alginate-like exopolymers (ALE) -- Hydrogels -- Uronic sugars; Biomass -- Periodicals; Biomass energy -- Periodicals; Bioremediation -- Periodicals; Agricultural wastes -- Periodicals; Factory and trade waste -- Periodicals; Organic wastes -- Periodicals; Bioénergie -- Périodiques; Déchets agricoles -- Périodiques; Déchets industriels -- Périodiques; Déchets organiques -- Périodiques; Déchets (Combustible) -- Périodiques; 662.88
• DOI: 10.1016/j.biortech.2020.123632
• Languages: English
• ISSNs: 0960-8524

Abstract

Graphical abstract: Highlights: ALE overall content and composition rather similar between flocs and aerobic granules. High VFA concentration in wastewater results in higher ALE and uronic sugar contents. ALE hydrogel from granules fed with real wastewater is more elastic than from flocs. Mannuronic acids are involved in the hydrogel property of ALE. Different sludges impact the composition and the properties of the recovered ALE. Abstract: The influence of wastewater (WW) composition and the bioaggregates types (floccular vs. aerobic granular sludge - AGS) on the content, physical-chemical, hydrogel and rheological properties of Alginate-Like Exopolymers (ALE) was studied. Results showed that ALE are a complex mixture of proteins, humic acids and polysaccharides. Overall, rather similar ALE content and composition was observed for the different types of sludge. Only the AGS fed with acetate and propionate yielded significantly larger amount of ALE (261 ± 33 mg VSALE /g VSsludge, +49%) and of uronic sugars in ALE (254 ± 32 mgglucuronic acid /g VSALE, +62%) than bioaggregates fed with no/very little volatile fatty acids. Mannuronic acids are involved in the cohesion of the hydrogels. ALE hydrogels elasticity changed significantly with the type/origin of the bioaggregates. ALE hydrogels elasticity from AGS was always higher than from flocs when fed with real WW. Hence, different types of sludge impact the properties of the recovered ALE.