Influence of hydraulic retention time on municipal wastewater treatment using microalgae-bacteria flocs in sequencing batch reactors

Soroosh, Hadi; Otterpohl, Ralf; Hanelt, Dieter

doi:10.1016/j.biteb.2021.100884

Cited by 8 publications

(3 citation statements)

References 29 publications

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“…These results suggest that the concentration of MAS inoculum to be used for microalgae cultivation and bioremediation of wastewater constitutes an essential condition that should be factored into experimental set-ups, which is in agreement with previously reported findings by [19]. Therefore, beyond defining the inoculum ratio for a mix-culture of MAS, it is essential to determine the appropriate MAS concentration with respect to the operational size of PBRs, to avoid any form of interference in the photosynthetic process that can consequently limit microalgae cell growth and replication.…”

Section: Assessment Of Total Coliforms and Escherichia Coli Removalsupporting

confidence: 92%

“…In most instances, the exploration of the potential of the synergistic interaction of microalgae and activated sludge bacteria co-culture has been carried out under laboratory conditions, with a constant supply of light and manipulation of other growth factors such as temperature and pH, using synthetic wastewater and real wastewater [17][18][19][20]. The few instances that explored outdoor solar radiation for the treatment of municipal wastewater with microalgae and activated sludge in PBRs focused on the influence of seasonal variations on treatment efficacy [21], inoculum ratio on the microbial community [22], and photo-oxygenation nitrogen-N removal from biosolids dewatered centrate [23].…”

Section: Introductionmentioning

confidence: 99%

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Exploration of Microalgae-Activated Sludge Growth Performance in Lab-Scale Photobioreactors under Outdoor Environmental Conditions for Wastewater Biotreatment

James,

Bankole,

Pompei

et al. 2023

Phycology

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Increasing the volume of untreated and inadequately treated municipal wastewater undermines the circular economy potential of wastewater resources, particularly in low-income regions. 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 up-flow anaerobic sludge blanket (UASB) in an outdoor lab-scale photobioreactor (2.2 L). Three conditions with distinct MAS inoculum concentrations alongside three controls were operated in batch mode for 5 days hydraulic retention time (HRT) at 11.5:12.5 photo-hours. The MAS inoculum concentration influenced the treatment outcome. The best performance was observed when the MAS concentration was 0.10/0.20 g L−1, and the cell density was 1.60 × 107 cells mL−1, total biomass productivity of 0.10 g TSS L−1 d−1, total phosphorus uptake of 85.1%, and total nitrogen uptake of 66.1%. Logarithmic removal (Log-Re) of bacterial pathogens (water quality indicators) showed Log-Re 3.4 for total coliforms (1.37 × 102 CFU 100 mL−1) and 4.7 for Escherichia coli (0.00 × 100 CFU 100 mL−1). The results revealed optimum remediation performance and nutrient recovery potential with appropriate inoculum concentration, in admiration to advancing the science of circular economy.

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Section: Assessment Of Total Coliforms and Escherichia Coli Removalsupporting

confidence: 92%

Section: Introductionmentioning

confidence: 99%

Exploration of Microalgae-Activated Sludge Growth Performance in Lab-Scale Photobioreactors under Outdoor Environmental Conditions for Wastewater Biotreatment

James,

Bankole,

Pompei

et al. 2023

Phycology

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“…In these systems, autotrophic microalgae and heterotrophic bacteria rely on each other to grow, i.e., algal cells produce oxygen while bacterial cells use it for BOD removal and produce CO 2 which is fixed by algal cells. In addition, the produced inorganic nitrogen and phosphorus are used by the microalgae for biomass production [145]. In lab experiments, microalgae showed high potential to treat different wastewater streams, such as municipal wastewater [146][147][148], distillery wastewater [149], brewery wastewater [150], pharmaceutical-rich wastewater [151], and dairy effluents [152].…”

Section: Microalgae-mnp Interactionmentioning

confidence: 99%

Recent Advances in Micro-/Nanoplastic (MNPs) Removal by Microalgae and Possible Integrated Routes of Energy Recovery

Abomohra

Hanelt

2022

Microorganisms

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Reliance on plastic has resulted in the widespread occurrence of micro-/nanoplastics (MNPs) in aquatic ecosystems, threatening the food web and whole ecosystem functions. There is a tight interaction between MNPs and microalgae, as dominant living organisms and fundamental constituents at the base of the aquatic food web. Therefore, it is crucial to better understand the mechanisms underlying the interactions between plastic particles and microalgae, as well as the role of microalgae in removing MNPs from aquatic ecosystems. In addition, finding a suitable route for further utilization of MNP-contaminated algal biomass is of great importance. The present review article provides an interdisciplinary approach to elucidate microalgae–MNP interactions and subsequent impacts on microalgal physiology. The degradation of plastic in the environment and differences between micro- and nanoplastics are discussed. The possible toxic effects of MNPs on microalgal growth, photosynthetic activity, and morphology, due to physical or chemical interactions, are evaluated. In addition, the potential role of MNPs in microalgae cultivation and/or harvesting, together with further safe routes for biomass utilization in biofuel production, are suggested. Overall, the current article represents a state-of-the-art overview of MNP generation and the consequences of their accumulation in the environment, providing new insights into microalgae integrated routes of plastic removal and bioenergy production.

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Recent advances in recirculating aquaculture systems and role of microalgae to close system loop

Ende,

Henjes,

Spiller

et al. 2024

Bioresource Technology

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Influence of hydraulic retention time on municipal wastewater treatment using microalgae-bacteria flocs in sequencing batch reactors

Cited by 8 publications

References 29 publications

Exploration of Microalgae-Activated Sludge Growth Performance in Lab-Scale Photobioreactors under Outdoor Environmental Conditions for Wastewater Biotreatment

Exploration of Microalgae-Activated Sludge Growth Performance in Lab-Scale Photobioreactors under Outdoor Environmental Conditions for Wastewater Biotreatment

Recent Advances in Micro-/Nanoplastic (MNPs) Removal by Microalgae and Possible Integrated Routes of Energy Recovery

Recent advances in recirculating aquaculture systems and role of microalgae to close system loop

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