Co-digestion of harvested microalgae and primary sludge in a mesophilic anaerobic membrane bioreactor (AnMBR): Methane potential and microbial diversity.

Abstract:

:Anaerobic co-digestion of primary sludge and raw microalgae (Scenedesmus and Chlorella) was performed in a lab-scale semi-continuous anaerobic membrane bioreactor to assess the biological performance and identify the microbial community involved in the co-digestion process. The reactor was operated at 35 °C for 440 days, working at a solids retention time of 100 days. The system achieved 73% biodegradability and showed high stability in terms of pH and volatile fatty acids. An enriched microbial community was observed. Of the several phyla, Chloroflexi and Proteobacteria were the most abundant. Cellulose-degraders phyla (Bacteroidetes, Chloroflexi and Thermotogae) were detected. Syntrophic microorganisms played an important role in intermediate degradation, enhancing methane production, mainly carried out by Methanosaeta. A nutrient-rich effluent (400 mg NH4-N·L-1 and 29 mg PO4-P·L-1) and digestate (860 mg N·L-1 and 151 mg P·L-1) were obtained. The bio-nutrients released from anaerobic co-digestion could be reused for microalgae cultivation or agricultural applications.

journal_name

Bioresour Technol

journal_title

Bioresource technology

authors

Serna-García R,Zamorano-López N,Seco A,Bouzas A

doi

10.1016/j.biortech.2019.122521

subject

Has Abstract

pub_date

2020-02-01 00:00:00

pages

122521

eissn

0960-8524

issn

1873-2976

pii

S0960-8524(19)31751-1

journal_volume

298

pub_type

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