**Author details**

**Conflict of interest**

54 Microalgal Biotechnology

**Nomenclature**

A Absorbance RAF Airlift reactor

COB Bubble column cells mL−1 Cells per milliliter

d<sup>h</sup> Hydraulic diameter

d.i. Internal diameter

PBR Photobioreactor

Fg Air intake flow in m−3 s−1

kB Coefficient of friction loss mg L−1d−1 Milligrams per liter per day

n.d. Not detectable

Ton Ton

PL Lipid productivity

rpm Revolutions per minute

U<sup>g</sup> Superficial gas velocity in ms−1

g Acceleration of gravity in m s−2

The authors indicate that there is no conflict of interest for the publication of this manuscript.

Ab Free area between the riser and the downcomer in m2

d<sup>i</sup> Diameter of the inner tube where the lighting is performed (m)

dbi Internal diameter of the deflector (m) dbo External diameter of the deflector (m)

do External diameter of the external tube (m)

h<sup>B</sup> Distance between base and deflector (m)

h<sup>G</sup> Height of the column including gas retention (m)

h<sup>L</sup> Height of liquid at rest without gas inlet (m)

Juan Carlos Robles Heredia<sup>1</sup> \*, Asteria Narváez García<sup>1</sup> , Alejandro Ruiz Marin<sup>1</sup> , Yunuen Canedo Lopez<sup>1</sup> , Jose del Carmen Zavala Loria2 and Julio Cesar Sacramento Rivero3

\*Address all correspondence to: jrobles@pampano.unacar.mx

1 Autonomus University of Carmen, Carmen City, Campeche, México

2 International University Iberoamerican, Campeche, México

3 Autonomus University of Yucatán, Mérida, Yucatán, México
