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Using Mechanisms of Hydrolysis and Sorption to Reduce Siloxanes Occurrence in Biogas of Anaerobic Sludge Digesters

Using Mechanisms of Hydrolysis and Sorption to Reduce Siloxanes Occurrence in Biogas of Anaerobic Sludge Digesters

Georgia Gatidou, Olga S Arvaniti, Athanasios S Stasinakis, Nikolaos S Thomaidis, Henrik R Andersen

Bioresour Technol. 2016 Dec;221:205-213.

PMID: 27639673

Abstract:

Hydrolysis of hexamethylcyclotrisiloxane (D3), octamethylcyclotetrasiloxane (D4), decamethylcyclopentasiloxane (D5), dodecamethylcyclohexasiloxane (D6) and dodecamethylcyclohexasilane (D6_silane) and their sorption to digested sludge was studied in batch experiments. Hydrolysis was affected by the type of the compound and the applied temperature, while the relevant half-life values ranged between 0.07±0.01d (D3, 55°C) and 48.4±17.1d (D6_silane, 4°C). D5 showed the greatest affinity for sorption to digested sludge (logKd: 3.84±3.42), the lowest LogKd value was found for D3 (1.46±0.95). Prediction of investigated compounds' fate in a single-stage anaerobic digestion system indicated that volatilization seems to be the major fate in both mesophilic and thermophilic conditions. The addition of a pre-digester with 3d retention time would significantly decrease the expected concentrations of all siloxanes in biogas, enhancing their removal through hydrolysis and sorption to sludge.

Chemicals Related in the Paper:

Catalog Number	Product Name	Structure	CAS Number	Price
AP4098300	Dodecamethylcyclohexasilane		4098-30-0	Price

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