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Bioresour Technol. 2016 Dec;221:324-330. doi: 10.1016/j.biortech.2016.09.050. Epub 2016 Sep 13.

Biohydrogen and methane production via a two-step process using an acid pretreated native microalgae consortium.

Author information

1
Laboratory for Research on Advanced Processes for Water Treatment, Unidad Académica Juriquilla, Instituto de Ingeniería, Universidad Nacional Autónoma de México, Blvd. Juriquilla 3001, Querétaro 76230, Mexico.
2
Laboratory for Research on Advanced Processes for Water Treatment, Unidad Académica Juriquilla, Instituto de Ingeniería, Universidad Nacional Autónoma de México, Blvd. Juriquilla 3001, Querétaro 76230, Mexico. Electronic address: gbuitronm@ii.unam.mx.

Abstract

A native microalgae consortium treated under thermal-acidic hydrolysis was used to produce hydrogen and methane in a two-step sequential process. Different acid concentrations were tested, generating hydrogen and methane yields of up to 45mLH2gVS-1 and 432mLCH4gVS-1, respectively. The hydrogen production step solubilized the particulate COD (chemical oxygen demand) up to 30%, creating considerable amounts of volatile fatty acids (up to 10gCODL-1). It was observed that lower acid concentration presented higher hydrogen and methane production potential. The results revealed that thermal acid hydrolysis of a native microalgae consortium is a simple but effective strategy for producing hydrogen and methane in the sequential process. In addition to COD removal (50-70%), this method resulted in an energy recovery of up to 15.9kJ per g of volatile solids of microalgae biomass, one of the highest reported.

KEYWORDS:

Acidic hydrolysis; Consortium; Dark fermentation; Hydrogen; Methane; Microalgae

PMID:
27648852
DOI:
10.1016/j.biortech.2016.09.050
[Indexed for MEDLINE]

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