Harvesting freshwater Chlorella vulgaris with flocculant derived from spent brewer's yeast.

Abstract:

:One of the key bottlenecks of the economically viable production of low added value microalgal products (food supplements, feed, biofuels) is the harvesting of cells from diluted culture medium. The main goals of this work were to prepare a novel flocculation agent based on spent brewer's yeast, a brewery by-product, and to test its harvesting efficiency on freshwater Chlorella vulgaris in different environments. The yeast was first autolyzed/hydrolyzed and subsequently chemically modified with 2-chloro-N,N-diethylethylamine hydrochloride (DEAE). Second, optimal dosage of modified spent yeast (MSY) flocculant for harvesting C. vulgaris was determined in culture media of various compositions. It was found that the absence of phosphorus ions decreased (0.4 mg MSY/g biomass), while the presence of algogenic organic matter (AOM) increased (51 mg MSY/g biomass) the required dosage of flocculant as compared to complete mineral medium with phosphorus and without AOM (12 mg MSY/g biomass).

journal_name

Bioresour Technol

journal_title

Bioresource technology

authors

Prochazkova G,Kastanek P,Branyik T

doi

10.1016/j.biortech.2014.11.056

subject

Has Abstract

pub_date

2015-02-01 00:00:00

pages

28-33

eissn

0960-8524

issn

1873-2976

pii

S0960-8524(14)01658-7

journal_volume

177

pub_type

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