TY - JOUR

T1 - Heterotrophic cultivation of Galdieria sulphuraria under non-sterile conditions in digestate and hydrolyzed straw

AU - Pleissner, Daniel

AU - Lindner, Astrid Victoria

AU - Händel, Nicole

PY - 2021/10/1

Y1 - 2021/10/1

N2 - Non-sterile heterotrophic cultivation of Galdieria sulphuraria in presence of digestate as well as straw after hydrolysis was investigated. G. sulphuraria can be grown in pure digestate at rates of 0.9 day−1 with glucose. However, a proteolytic treatment of digestate resulted in increased growth rates (1.2 day−1) and doubled cell concentrations. Furthermore, G. sulphuraria can utilize glucose obtained after straw hydrolysis. Biomass yields in glucose limited cultures were around 0.9 g per g glucose, while only 0.2 g biomass was formed per g glucose in glucose sufficient cultures. Biomass composition (w/w) of G. sulphuraria grown in digestate supplemented with straw hydrolysate consisted of 20% carbohydrates, 37% proteins and 3% lipids. This study revealed the potential to utilize agricultural waste streams to form algal biomass rich in proteins and may pave the way to novel utilization strategies to be implemented in rural areas.

AB - Non-sterile heterotrophic cultivation of Galdieria sulphuraria in presence of digestate as well as straw after hydrolysis was investigated. G. sulphuraria can be grown in pure digestate at rates of 0.9 day−1 with glucose. However, a proteolytic treatment of digestate resulted in increased growth rates (1.2 day−1) and doubled cell concentrations. Furthermore, G. sulphuraria can utilize glucose obtained after straw hydrolysis. Biomass yields in glucose limited cultures were around 0.9 g per g glucose, while only 0.2 g biomass was formed per g glucose in glucose sufficient cultures. Biomass composition (w/w) of G. sulphuraria grown in digestate supplemented with straw hydrolysate consisted of 20% carbohydrates, 37% proteins and 3% lipids. This study revealed the potential to utilize agricultural waste streams to form algal biomass rich in proteins and may pave the way to novel utilization strategies to be implemented in rural areas.

KW - Agricultural residues

KW - Anaerobic digestion

KW - Digestate

KW - Hydrolysis

KW - Straw

KW - Biology

UR - http://www.scopus.com/inward/record.url?scp=85109439343&partnerID=8YFLogxK

U2 - 10.1016/j.biortech.2021.125477

DO - 10.1016/j.biortech.2021.125477

M3 - Journal articles

C2 - 34320757

AN - SCOPUS:85109439343

VL - 337

JO - Bioresource Technology

JF - Bioresource Technology

SN - 0960-8524

M1 - 125477

ER -