Preprint Article Version 1 Preserved in Portico This version is not peer-reviewed

Exploration of Microalgae-Activated Sludge (Mas) Growth Performance in Lab-Scale Photobioreactor at Outdoor Environmental Condition for Wastewater Biotreatment

Abraham Olamilekan James
,
Abayomi Oluwatobiloba Bankole
ORCID logo ,
Caroline Moço Erba Pompei
,
Gustavo Alencar Silva Almeida Dantas
ORCID logo ,
Graziele Ruas
* ORCID logo ,
Gustavo Henrique Ribeiro Da Silva
ORCID logo
Version 1 : Received: 8 November 2023 / Approved: 9 November 2023 / Online: 9 November 2023 (07:45:01 CET)

A peer-reviewed article of this Preprint also exists.

James, A.O.; Bankole, A.O.; Pompei, C.M.E.; Dantas, G.A.S.A.; Ruas, G.; Silva, G.H.R. Exploration of Microalgae-Activated Sludge Growth Performance in Lab-Scale Photobioreactors under Outdoor Environmental Conditions for Wastewater Biotreatment. Phycology 2023, 3, 484-502. James, A.O.; Bankole, A.O.; Pompei, C.M.E.; Dantas, G.A.S.A.; Ruas, G.; Silva, G.H.R. Exploration of Microalgae-Activated Sludge Growth Performance in Lab-Scale Photobioreactors under Outdoor Environmental Conditions for Wastewater Biotreatment. Phycology 2023, 3, 484-502.

Abstract

Increased volume of untreated and inadequately treated municipal wastewater undermines the circular economy potential of wastewater resources, particularly in low-income region. This present study focused on and evaluated the performance of native microalgae-activated sludge (MAS) growth for tertiary treatment of anaerobically digested wastewater from an upflow anaerobic sludge blanket (UASB) in an outdoor lab-scale photobioreactors (2 L). Seven conditions with distinct inoculum concentrations were operated in batch mode in triplicate for 5-days hydraulic retention time (HRT) at 11.5:12.5 Photo-hours. MAS inoculum concentration influenced treatment outcome. The best performance was observed in MAS concentration 0.10/0.20 g L-1, with cell density count (2.03 x 107 cells mL-1), biomass productivity 0.125 g TSS L-1 d-1 and total phosphorus uptake (85.07%), total nitrogen uptake (66.14%). Logarithmic removal (Log-Re) of bacterial pathogens (water quality indicators) showed Log-Re ((3.4 for total coliforms (1.37E+02 CFU 100 mL-1) and 4.7 for Escherichia coli (0.00E+00 CFU 100 mL-1)). Results revealed optimum remediation performance and nutrients’ recovery potential with appropriate inoculum concentration, in admiration to advancing the science of circular economy.

Keywords

Microalgae-Activated Sludge; Nutrients recovery; Pollutant removal; Total Coliform and Escherichia coli removal

Subject

Environmental and Earth Sciences, Water Science and Technology

Copyright: This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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