Anaerobic Digestion of Organic Fraction from Hydrothermal Liquefied Algae Wastewater Byproduct

Fernandez, Sebastian; Srinivas, Keerthi; Schmidt, Andrew J.; Swita, Marie S.; Ahring, Birgitte K.

doi:10.1016/J.BIORTECH.2017.09.030

Anaerobic Digestion of Organic Fraction from Hydrothermal Liquefied Algae Wastewater Byproduct

Journal Article · Wed Sep 06 00:00:00 EDT 2017 · Bioresource Technology

DOI:https://doi.org/10.1016/J.BIORTECH.2017.09.030· OSTI ID:1379950

Fernandez, Sebastian ^[1]; Srinivas, Keerthi ^[1]; Schmidt, Andrew J. ^[2]; Swita, Marie S. ^[2]; Ahring, Birgitte K. ^[3]

Washington State University, Richland, WA (United States). Bioproducts, Sciences and Engineering Laboratory
Pacific Northwest National Lab. (PNNL), Richland, WA (United States). Chemical and Biological Processes Development Group, Energy and Efficiency Division
Washington State University, Richland, WA (United States). Bioproducts, Sciences and Engineering Laboratory; Washington State University, Pullman, WA (United States). Biological Systems Engineering, L.J. Smith Hall and The Gene and Linda Voiland School of Chemical Engineering and Bioengineering

We present that the wastewater stream from hydrothermal liquefaction (HTL) process used in biofuel production, contains a large amounts of organic compounds where several can be regarded as environmentally hazardous and requires significant treatment before disposal. In this study, semi-continuous anaerobic digestion is used to degrade the organic fraction of wastewater streams from HTL of the algae Tetraselmis (AgTet) and Chlorella (AgChlr). Results indicated high methane yields at 20-30% (v/v) HTL wastewater together with clarified manure, producing 327.2 mL/gVS_in (or volatile solids in feed) for AgTet and 263.4 mL/gVS_in for AgChlr. There was a significant reduction in methane production at concentrations higher than 40% (v/v) HTL wastewater in the feed, possibly due to the accumulation of chloride salts or inhibitory compounds such as pyridines, piperidines and pyrrolidines. In conclusion, this was further confirmed by comparing COD, salt and the ammonia concentrations of the effluents after anaerobic digestion at different concentrations of wastewater in manure.

View Accepted Manuscript (DOE)

Research Organization:: Pacific Northwest National Laboratory (PNNL), Richland, WA (United States)

Sponsoring Organization:: USDOE; USDOE Office of Energy Efficiency and Renewable Energy (EERE), Bioenergy Technologies Office (EE-3B)

Grant/Contract Number:: AC05-76RL01830

OSTI ID:: 1379950

Alternate ID(s):: OSTI ID: 1395277
OSTI ID: 1495864

Journal Information:: Bioresource Technology, Journal Name: Bioresource Technology Vol. 247; ISSN 0960-8524

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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