Harvesting microalgae using ozone-air flotation for recovery of biomass, lipids, carbohydrates, and proteins
Por:
Valeriano González M.T., Orta Ledesma M.T., Velasquez-Orta, Sharon Belinda, Monje Ramírez I.
Publicada:
19 sep 2021
Ahead of Print:
1 mar 2020
Resumen:
The objective of this research was to study a novel ozone-air flotation
microalgae harvesting method and evaluate its effect on the recovery of
biomass and biocomponents (lipids, carbohydrates, proteins). Best
processing conditions were established using a response surface
methodology (RSM). Microalgae separation and biocomponent recovery were
evaluated according to changes in gas concentration (13, 18 and 25
mgO(3)/L), ozone dose (0.04, 0.09 and 0.16 mg O-3/mg biomass) and
airflow rate (0.5, 1.0 and 1.5 L/min). More than 95% of the biomass was
recovered from wastewater at an ozone-air combination of 0.09 mgO(3)/mg
biomass and 1.5 L air/min. Using ozone-air represented a reduction of
59% in the ozone dose compared to the flotation process solely using
ozone (0.22 mgO(3)/mg biomass). In addition, there was an improved yield
in the recovery of all microalgae biocomponents. A maximum yield of 0.18
mg lipids/mg biomass was achieved at: 0.16 mg O-3/mg biomass, 25 mg gas
O-3/L and 1.5 L air/min. In conclusion, combining the use of ozone-air
for separation of microalgae reduces ozone requirement and enhances
lipids and proteins post-extraction.
Filiaciones:
Valeriano González M.T.:
Instituto de Ingeniería, Coordinación de Ingeniería Ambiental, Universidad Nacional Autónoma de México, Ciudad Universitaria, Coyoacán, Mexico
Orta Ledesma M.T.:
Instituto de Ingeniería, Coordinación de Ingeniería Ambiental, Universidad Nacional Autónoma de México, Ciudad Universitaria, Coyoacán, Mexico
Velasquez-Orta, Sharon Belinda:
School of Engineering, Newcastle University, Newcastle upon Tyne, United Kingdom
Monje Ramírez I.:
Instituto de Ingeniería, Coordinación de Ingeniería Ambiental, Universidad Nacional Autónoma de México, Ciudad Universitaria, Coyoacán, Mexico
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