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Open AccessArticle

Real-Time Behavior of a Microalgae–Bacteria Consortium Treating Wastewater in a Sequencing Batch Reactor in Response to Feeding Time and Agitation Mode

1
LIP-MB Laboratory (LR11ES24), Depatment of Biological and Chemical Engineering -National Institute of Applied Sciences and Technology, University of Carthage, BP 676, Tunis CEDEX 1080, Tunisia
2
Higher Institute of Fisheries and Aquaculture of Bizerte, University of Carthage, BP 15 Errimel, Bizerte 7080, Tunisia
3
Department of Civil Environmental and Mechanical Engineering, University of Trento, 38122 Trento, Italy
*
Author to whom correspondence should be addressed.
Water 2020, 12(7), 1893; https://doi.org/10.3390/w12071893
Received: 28 May 2020 / Revised: 30 June 2020 / Accepted: 30 June 2020 / Published: 2 July 2020
(This article belongs to the Special Issue Integration of Microalgal Based Processes in Wastewater Treatment)
A study of a microalgae–bacteria treatment system was conducted in a sequencing batch reactor (SBR) by combining a precultured native algae Nannochloropsis gaditana L2 with spontaneous municipal wastewater microorganisms. Two types of agitation, air mixing (AI) and mechanical mixing (MIX), were assessed at continuous illumination (L) and photoperiod cycle light/dark (L/D). The obtained consortium, via native microalgae addition, has a better operational efficiency compared to spontaneous control. This allows the removal of 78% and 53% of total Kjeldhal nitrogen (TKN) and chemical oxygen demand (COD), respectively. Under the (L/D) photoperiod, the optimal removal rate (90% of TKN and 75% of COD) was obtained by the consortium at 4 days of hydraulic retention time (HRT) using the AI mode. Moreover, during feeding during dark (D/L) photoperiod, the highest removal rate (83% TKN and 82% COD) was recorded at 4 days HRT using the AI mode. These results bring, at the scale of a bioreactor, new data regarding the mode of aeration and the feeding time. They prove the concept of such a technology, increasing the attraction of microalgae-based wastewater treatment. View Full-Text
Keywords: microalgae; wastewater treatment; SBR; feeding time; hydraulic retention time; agitation type; photoperiod application microalgae; wastewater treatment; SBR; feeding time; hydraulic retention time; agitation type; photoperiod application
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MDPI and ACS Style

Mhedhbi, E.; Khelifi, N.; Foladori, P.; Smaali, I. Real-Time Behavior of a Microalgae–Bacteria Consortium Treating Wastewater in a Sequencing Batch Reactor in Response to Feeding Time and Agitation Mode. Water 2020, 12, 1893. https://doi.org/10.3390/w12071893

AMA Style

Mhedhbi E, Khelifi N, Foladori P, Smaali I. Real-Time Behavior of a Microalgae–Bacteria Consortium Treating Wastewater in a Sequencing Batch Reactor in Response to Feeding Time and Agitation Mode. Water. 2020; 12(7):1893. https://doi.org/10.3390/w12071893

Chicago/Turabian Style

Mhedhbi, Emna; Khelifi, Nadia; Foladori, Paola; Smaali, Issam. 2020. "Real-Time Behavior of a Microalgae–Bacteria Consortium Treating Wastewater in a Sequencing Batch Reactor in Response to Feeding Time and Agitation Mode" Water 12, no. 7: 1893. https://doi.org/10.3390/w12071893

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