Energy and nutrients recovery from wastewater cultivated microalgae: Assessment of the impact of wastewater dilution on biogas yield

Vargas-Estrada, Laura; Longoria, Adriana; Okoye, Patrick U.; Sebastián, P.J.

doi:10.1016/j.biortech.2021.125755

Cited by 31 publications

(7 citation statements)

References 42 publications

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“…In this study, batch mode experiments were performed using diluted (with tap water) MDFJ with three different initial d‐COD concentrations: (i) 7000 mg L −1 (experimental sets LS1, LS2, LS3, considering LS‐C1 as the control experiment); (ii) 5500 mg L −1 (experimental sets LS4, LS5, LS6, considering LS‐C2 as the control experiment); and (iii) 3000 mg L −1 (experimental set LS7) with different N:P ratios (Table 2). Dilution can reduce the toxic effects of high organic or inorganic nutrient concentrations, while the presence of microalgae predators in the wastewaters can lead to lower turbidity and color intensity, in addition to being used as a means of nutrient limitation with the aim of enhancing lipid synthesis 51,52 . Moreover, differences in the initial nutrient concentrations of Table 2 were attributed to nutrients contained within the initial inoculum.…”

Section: Resultsmentioning

confidence: 99%

“…Dilution can reduce the toxic effects of high organic or inorganic nutrient concentrations, while the presence of microalgae predators in the wastewaters can lead to lower turbidity and color intensity, in addition to being used as a means of nutrient limitation with the aim of enhancing lipid synthesis. 51,52 Moreover, differences in the initial nutrient concentrations of Table 2 were attributed to nutrients contained within the initial inoculum.…”

Section: Resultsmentioning

confidence: 99%

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Biotreatment of discarded fruit juices and simultaneous lipid production using Leptolyngbya sp.

Patrinou

Αντωνοπούλου

Ντάϊκου³

et al. 2023

J of Chemical Tech & Biotech

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BACKGROUND: Fruit juices are an exceptional source of nutrients; however, due to their short shelf-life and vulnerability to microbial degradation, large volumes of juice are regularly discarded worldwide. As a wastewater, discarded fruit juices (DFJ) possess high organic loads with significant amounts of nitrogen and phosphorus, making them a suitable substrate for microbial growth and to produce natural bioactive compounds.RESULTS: Discarded fruit juices (DFJ) were treated and simultaneously valorized (producing microbial lipids) using a microbial consortium dominated by the photosynthetic cyanobacterium Leptolyngbya sp. The effects of N:P and C:N ratios on growth and lipid production were examined, along with the ability of the consortium to biotreat DFJ in laboratory-scale (LS) reactors. Using the optimum nutrient ratios (N:P 5:1, C:N 50.2:1), scaled-up reactors (aquariums) were then tested under suspended and attached growth conditions. The biomass produced was further exploited for lipid production and the results revealed that Leptolyngbya sp. was able to produce up to 19% d.w. lipids and simultaneously efficiently treat DFJ. High dissolved-chemical oxygen demand (d-COD), total nitrogen, and PO 4 3− removal rates (85.0% and 93.9%, 93.4% and 95.2%, 84.6% and 83.9%, respectively) were achieved in both the suspended and attached growth systems, along with high biomass productivities (316.3, 340.0 mg L −1 day −1 , respectively). CONCLUSION: The biological approach used in this study demonstrated that is possible to exploit DFJ and achieve satisfactory lipid contents (up to 19% d.w.) using a cyanobacterial-based consortium.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Biotreatment of discarded fruit juices and simultaneous lipid production using Leptolyngbya sp.

Patrinou

Αντωνοπούλου

Ντάϊκου³

et al. 2023

J of Chemical Tech & Biotech

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“…3 GBs are mainly produced from microalgae [10], which can be grown on non-arable land using non-potable water, avoiding competition with the agriculture industry [96]. Different biofuels (e.g., biodiesel, bioethanol, biogas, biohydrogen, and biochar) [94][95][96][97][98][99][100][101][102][103][104][105][106][107][108][109][110][111][112] can be obtained from microalgae due to their high and unique potential.…”

Section: Biofuelsmentioning

confidence: 99%

“…Vargas-Estrada et al [109] studied the integration of microalgae (Chlorella sp.) into urban wastewater treatment as a tertiary treatment to recover nutrients and for further energy recovery as biogas.…”

Section: Biofuelsmentioning

confidence: 99%

Microalgal Systems for Wastewater Treatment: Technological Trends and Challenges towards Waste Recovery

et al. 2021

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Wastewater (WW) treatment using microalgae has become a growing trend due the economic and environmental benefits of the process. As microalgae need CO2, nitrogen, and phosphorus to grow, they remove these potential pollutants from wastewaters, making them able to replace energetically expensive treatment steps in conventional WW treatment. Unlike traditional sludge, biomass can be used to produce biofuels, biofertilizers, high value chemicals, and even next-generation growth media for “organically” grown microalgal biomass targeting zero-waste policies and contributing to a more sustainable circular bioeconomy. The main challenge in this technology is the techno-economic feasibility of the system. Alternatives such as the isolation of novel strains, the use of native consortia, and the design of new bioreactors have been studied to overcome this and aid the scale-up of microalgal systems. This review focuses on the treatment of urban, industrial, and agricultural wastewaters by microalgae and their ability to not only remove, but also promote the reuse, of those pollutants. Opportunities and future prospects are discussed, including the upgrading of the produced biomass into valuable compounds, mainly biofuels.

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“…Even though several studies report the effective use of C. vulgaris for conventional pollutants removals, such as nitrogen and phosphorus [25,26], few are related to disinfection and ARGs reduction of abundance [4,20,24]. To the authors' knowledge, none has evaluated the removal of conventional pollutants and the reduction of pathogens proliferation and ARGs abundance in the same system.…”

Section: Introductionmentioning

confidence: 99%

Microalgal Systems, a Green Solution for Wastewater Conventional Pollutants Removal, Disinfection, and Reduction of Antibiotic Resistance Genes Prevalence?

et al. 2023

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The low-efficiency rate of urban wastewater (UWW) treatment generates tons of discharged water with a high concentration of pollutants, pathogens and antibiotic-resistance genes (ARGs). Microalgal systems may be a green alternative to be implemented as a UWW polishing treatment. This study assessed the ability of Chlorella vulgaris and UWW autochthonous microalgal species (AMS) to simultaneously remove PO4–P, and reduce the proliferation of coliforms and ARGs. AMS seems to be more promising due to: (i) the higher specific growth rate, μmax (0.687 ± 0.065 d−1); (ii) efficient PO4–P removal (92.62 ± 0.10%); (iii) faster reduction of coliforms proliferation achieving concentrations below the limits of quantification (6 d); (iv) the reduction of intl1 and the ARGs sul1 and blaTEM abundance in ca. of 70.4%, 69.2%, and 75.7%, respectively (9 d); and (v) the additional reduction of these genes in ca. of 97.1%, 94.2%, and 99.9%, respectively, after 5 d storage in the dark and at room temperature. Results also revealed that the high pH values in both microalgal systems (due to microalgal growth) were highly correlated with a reduction in the proliferation of coliforms, including Escherichia coli. In conclusion, using AMS as a final polishing treatment of UWW seems to be very promising.

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Energy and nutrients recovery from wastewater cultivated microalgae: Assessment of the impact of wastewater dilution on biogas yield

Cited by 31 publications

References 42 publications

Biotreatment of discarded fruit juices and simultaneous lipid production using Leptolyngbya sp.

Biotreatment of discarded fruit juices and simultaneous lipid production using Leptolyngbya sp.

Microalgal Systems for Wastewater Treatment: Technological Trends and Challenges towards Waste Recovery

Microalgal Systems, a Green Solution for Wastewater Conventional Pollutants Removal, Disinfection, and Reduction of Antibiotic Resistance Genes Prevalence?

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