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Specialized BES research in process-engineering focusing on process-integration. Hydrothermal carbonization (HTC) is a promising technology for chemical and material synthesis. However, HTC produces not ...

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Abstract

Hydrothermal carbonization (HTC) is a promising technology for chemical and material synthesis. However, HTC produces not only valuable solid coal-materials but also yields process water (PW) with high chemical oxygen demand (COD) that requires extensive treatment. Anaerobic digestion (AD) has been used for initial treatment of HTC-PW, but the AD effluent is still high in COD and particles. Here, we show that microbial electrochemical technologies (MET) can be applied for COD removal from AD effluent of HTC-PW. Bioelectrochemical systems (BES) treating different shares of AD effluent from HTC-PW exhibited similar trends for current production. Thereby, maximum current densities of 0.24 mA cm −2 and COD removal of 65.4 ± 4.4% were reached ( n = 3). Microbial community analysis showed that the genus Geobacter dominated anode biofilm and liquid phase of all reactors indicating its central role for COD oxidation and current generation.

Keywords

EffluentChemical oxygen demandHydrothermal carbonizationMicrobial fuel cellPulp and paper industryAnaerobic digestion

Identifiers

DOI
10.3389/fceng.2021.652445
Journal
Frontiers in Chemical Engineering
Year
2021