Assessing the stability and techno-economic implications for wet storage of harvested microalgae to manage seasonal variability

Table 1 Storage performance of Scenedesmus acutus biomass after 30 or 180 days of wet anaerobic storage

Treatment^a	Length of storage (days)	Dry matter loss (%, db)	Material pH	Total organic acids (%, db)^b
Anaerobic	30	10.8 ± 3.7	4.2 ± 0.06	15.8 ± 4.3
Anaerobic	180	1.7 ± 1.6^c	4.5 ± 0.06	17.4 ± 4.7
Sulfuric acid (0.5%, db)	30	15.5 ± 1.4	4.2 ± 0.02	17.6 ± 1.8
Sulfuric acid (0.5%, db)	180	5.4 ± 4.2^c	4.6 ± 0.4^c	16.3 ± 4.7
Glycosidase	30	11.6 ± 2.0	5.0 ± 0.21	10.5 ± 0.7
Glycosidase	180	9.7 ± 1.1	4.4 ± 0.04^c	19.2 ± 0.6
Glucose oxidase	30	15.1 ± 0.5	5.1 ± 0.1	14.8 ± 1.4
Glucose oxidase	180	13.2 ± 1.0	4.7 ± 0.2	17.5 ± 3.4

^aAll treatment conditions were stored anaerobically in the dark at 20% solids. Mean (n = 3) and standard deviation are presented
^bTotal organic acids refers to the sum of succinic, lactic, formic, acetic, propionic, isobutyric, butyric, isovaleric, and valeric acids present after storage
^cRepresent statistically significant difference between 30 and 180 days treatments based on likelihood probability analysis using 5% confidence intervals

ISSN: 2731-3654