TITLE:
Potential of Dictyosphaerium sp. LC172264 Concomitant Remediation of Cassava Wastewater and Accumulation of Lipids for Biodiesel Production
AUTHORS:
Innocent Okonkwo Ogbonna, Joseph Ikwebe, Otsai Otsima Okpozu, Chijioke Nwoye Eze, James Chukwuma Ogbonna
KEYWORDS:
Biodiesel Production, Cassava Wastewater, Dictyosphaerium sp., Fatty Acid Profile
JOURNAL NAME:
Advances in Bioscience and Biotechnology,
Vol.12 No.8,
August
20,
2021
ABSTRACT: As a way of making algal feedstock feasible for
biofuel production, simultaneous utilization
of microalga Dictyosphaerium sp.
LC172264 for cassava wastewater remediation and accumulation of lipids
for biodiesel production was investigated. The algal biomass, lipid contents
and composition were measured from the autotrophic, heterotrophic and
mixotrophic cultured algal cells. Physicochemical parameters of the cassava
wastewater and bioremediation potentials were measured. Biodiesel properties
were deduced and compared with the standards. The results showed that
mixotrophic culture was the best for both biomass accumulation (1.022 g/L) and
lipid contents (24.53%). Irrespective of the culture condition, the predominant
fatty acids were similar and included 11-Octadecenoic acid (vaccenic acid (C19H36O2),
oleic acid (C18H34O2) and 14-methyl
pentadecanoic acid (isopalmitic acid (C17H34O2).
The percentage reduction of total dissolved solids was 79.32% and 89.78% for
heterotrophy and mixotrophy respectively. Biochemical oxygen demand was 72.95%
and 89.35%, chemical oxygen demand was 72.19% and 84.03% whereas cyanide
contents reduced from the initial value of 450 mg/L to 93.105 (79.31%) and
85.365 mg/L (81.03%) respectively. Dictyosphaerium sp. showed good growth and lipid production under mixotrophic condition and
produced good quality biodiesel under the three cultivation modes. Even though
both mixotrophic and heterotrophic conditions had good promise of cassava
wastewater remediation by Dictyosphaerium sp., mixotrophy showed superiority.