Valorising nutrient-rich digestate: Dilution, settlement and membrane filtration processing for optimisation as a waste-based media for microalgal cultivation

Fernandes, Fleuriane; Silkina, Alla; Fuentes-Grünewald, Claudio; Wood, Eleanor E.; Ndovela, Vanessa L.S.; Oatley-Radcliffe, Darren L.; Lovitt, Robert W.; Llewellyn, Carole A.

doi:10.1016/j.wasman.2020.08.037

Cited by 52 publications

(31 citation statements)

References 50 publications

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“…At higher supplementation over 20% (v/v), growth was inhibited, probably due to decreased transparency and the culture becoming photo-limited [62]. As mentioned, growth limitation at higher digestate concentration was observed by Fernandes et al [50] as well.…”

Section: Removal Of Solids and Increasing Light Permeabilitymentioning

confidence: 76%

“…The application of solution-diffusion membranes (reverse osmosis) can separate dissolved salts such as NH 4 [17,46]. Using microfiltration, 93% of phosphorous and, with a combination of micro-, ultra-, and nano-filtration, 94% of nitrogen could be recovered [50]. Digestate processing via membranes typically includes micro-or ultrafiltration followed by two-to three-stage reverse osmosis, depending on the permeate quality.…”

Section: Nutrient Removal and Recoverymentioning

confidence: 99%

“…Thus, digestate in general is suitable for the cultivation of many different microalgae strains. Various authors have already described the utilization of digestate for microalgae cultivation [44,50,[60][61][62]. Nevertheless, prior to cultivation at a larger scale, it is mandatory to perform preliminary laboratory experiments in each specific case.…”

Section: Cultivation In Digestatementioning

confidence: 99%

“…However, the growth rate in ultrafiltration permeate (diluted 1/5) was considerably lower (0.23 d −1 compared to 0.5 d −1 in supernatant (diluted 1/5) and 0.86 d −1 in BG-11), which was assumed to result from low Mg concentrations or low N/P ratios [44]. Fernandes et al [50] chose a different order for digestate treatment-first dilution (various concentrations), then sedimentation, and finally filtration steps were performed. Chlorella vulgaris performed better at low concentrations of processed digestate (2.5%).…”

Section: Removal Of Solids and Increasing Light Permeabilitymentioning

confidence: 99%

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Digestate as Sustainable Nutrient Source for Microalgae—Challenges and Prospects

et al. 2021

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The interest in microalgae products has been increasing, and therefore the cultivation industry is growing steadily. To reduce the environmental impact and production costs arising from nutrients, research needs to find alternatives to the currently used artificial nutrients. Microalgae cultivation in anaerobic effluents (more specifically, digestate) represents a promising strategy for increasing sustainability and obtaining valuable products. However, digestate must be processed prior to its use as nutrient source. Depending on its composition, different methods are suitable for removing solids (e.g., centrifugation) and adjusting nutrient concentrations and ratios (e.g., dilution, ammonia stripping). Moreover, the resulting cultivation medium must be light-permeable. Various studies show that growth rates comparable to those in artificial media can be achieved when proper digestate treatment is used. The necessary steps for obtaining a suitable cultivation medium also depend on the microalgae species to be cultivated. Concerning the application of the biomass, legal aspects and impurities originating from digestate must be considered. Furthermore, microalgae species and their application fields are essential criteria when selecting downstream processing methods (harvest, disintegration, dehydration, product purification). Microalgae grown on digestate can be used to produce various products (e.g., bioenergy, animal feed, bioplastics, and biofertilizers). This review gives insight into the origin and composition of digestate, processing options to meet requirements for microalgae cultivation and challenges regarding downstream processing and products.

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Section: Removal Of Solids and Increasing Light Permeabilitymentioning

confidence: 76%

Section: Nutrient Removal and Recoverymentioning

confidence: 99%

Section: Cultivation In Digestatementioning

confidence: 99%

Section: Removal Of Solids and Increasing Light Permeabilitymentioning

confidence: 99%

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Digestate as Sustainable Nutrient Source for Microalgae—Challenges and Prospects

et al. 2021

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“…The use of the green microalga Chlorella sp. is reported in some studies of microalgae-based fertilizers spread application on agricultural land, for instance, liquid extract application of C. vulgaris as a foliar spray has promoted the germination percentage, the radicle and plumule length of three plant species, Lepidium sativum (garden cress), Eruca sativa (arugula) and Vigna radiata (mung bean) [103][104][105][106]. Moreover, dried C. vulgaris can be used as a soil conditioner and natural fertilizer, enriching the soil with nutrients, and promoting Zea mays (maize) seedling [107].…”

Section: Discussionmentioning

confidence: 99%

Municipal Wastewater: A Sustainable Source for the Green Microalgae Chlorella vulgaris Biomass Production

Pacheco

Rocha

Garcia³

et al. 2021

Applied Sciences

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The need to reduce the costs associated with microalgae cultivation encouraged scientific research into coupling this process with wastewater treatment. Thus, the aim of this work was to assess the growth of Chlorella vulgaris (Chlorophyta) in different effluents from a municipal wastewater treatment plant (WWTP), namely secondary effluent (SE) and sludge run-off (SR). Assays were performed, under the same conditions, in triplicate with 4 dilution ratios of the wastewaters (25%, 50%, 75% and 100%) with the standard culture medium bold basal medium double nitrated (BBM2N) as a control. The capability of C. vulgaris for biomass production, chlorophyll synthesis and nutrients removal in the SE and SR was evaluated. The 25% SE and 25% SR showed increased specific growth rates (0.47 and 0.55 day−1, respectively) and higher biomass yields (8.64 × 107 and 1.95 × 107 cells/mL, respectively). Regarding the chlorophyll content, the 100% SR promoted the highest concentration of this pigment (2378 µg/L). This green microalga was also able to remove 94.8% of total phosphorus of SE, while in 50% SR, 31.2% was removed. Removal of 73.9% and 65.9% of total nitrogen in 50% and 100% SR, respectively, was also observed. C. vulgaris growth can, therefore, be maximized with the addition of municipal effluents, to optimize biomass production, while cleansing the effluents.

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Production of Nutrient-Rich Biofertilizer Through Membrane Filtration of Digestate: Application for Tomato (Lycopersicon esculentum L.) Cultivation

Triki,

Sayadi,

Loukil

et al. 2024

Advances in Science, Technology &Amp; Innovation

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Valorising nutrient-rich digestate: Dilution, settlement and membrane filtration processing for optimisation as a waste-based media for microalgal cultivation

Cited by 52 publications

References 50 publications

Digestate as Sustainable Nutrient Source for Microalgae—Challenges and Prospects

Digestate as Sustainable Nutrient Source for Microalgae—Challenges and Prospects

Municipal Wastewater: A Sustainable Source for the Green Microalgae Chlorella vulgaris Biomass Production

Production of Nutrient-Rich Biofertilizer Through Membrane Filtration of Digestate: Application for Tomato (Lycopersicon esculentum L.) Cultivation

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