Exploring technological alternatives of nutrient recovery from digestate as a secondary resource

Barampouti, Elli Maria; Mai, Sofia; Malamis, Dimitris; Μουστάκας, Κωνσταντίνος; Loizidou, Maria

doi:10.1016/j.rser.2020.110379

Cited by 94 publications

(38 citation statements)

References 95 publications

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“…To conclude, complex interdependencies of variables determine the organism's environment and its growth performance in every cultivation. Most of the variables described above are influenced when digestate is used as nutrient source instead of mineral medium [17,[46][47][48]. The composition of anaerobic effluents is directly connected to the feedstock used for the anaerobic digestion, which is described below in more detail (Sections 3 and 4).…”

Section: Digestate As Nutrient Sourcementioning

confidence: 99%

“…Digestate or anaerobic effluents arise when carbon of organic material is converted to biogas under anaerobic conditions, mainly consisting of methane (CH 4 -energetic component) and CO 2 . Most macro-(N, P, K, S, Mg, Ca) and micronutrients (B, Cl, Cu, Fe, Mn, Mo, Ni, Zn) are concentrated in digestate [46]. However, digestate also contains solids (suspended matter) and colorants.…”

Section: Origin Of Digestatementioning

confidence: 99%

“…However, digestate also contains solids (suspended matter) and colorants. The raw material affects the TS (total solids-fiber, particles, soluble solids) and nutrient content (N, P, K) of the digestate [17,[46][47][48]. An overview of the nutrient composition of different digestates in terms of their origin is summarized in Table 2.…”

Section: Origin Of Digestatementioning

confidence: 99%

“…An overview of the nutrient composition of different digestates in terms of their origin is summarized in Table 2. On the basis of the used raw material, biogas plants can be categorized into agricultural, industrial, and waste plants [17,[46][47][48]. Agricultural plants use agricultural residues as well as renewable materials, industrial plants use various organic residues ranging from whey to slaughterhouse residues and wastewater, whereas different kinds of food wastes are used in waste plants [17].…”

Section: Origin Of Digestatementioning

confidence: 99%

“…Subsequently, solids can be directly used to fertilize fields, composted, or dried. Nutrient recovery can be carried out via membrane technologies such as ultra-or nano-filtration with subsequent reverse osmosis and separated into nutrient concentrates and purified processed water [17,46,47]. The nitrogen concentration can be reduced or adjusted in digestate or the liquid fraction via stripping, ion exchange, struvite precipitation [17,47,48], and evaporation [46]; membrane conductors [51] have already successfully been tested at lab scale [17,47,48].…”

Section: Digestate Processingmentioning

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: Digestate As Nutrient Sourcementioning

confidence: 99%

Section: Origin Of Digestatementioning

confidence: 99%

Section: Origin Of Digestatementioning

confidence: 99%

Section: Origin Of Digestatementioning

confidence: 99%

Section: Digestate Processingmentioning

confidence: 99%

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Digestate as Sustainable Nutrient Source for Microalgae—Challenges and Prospects

et al. 2021

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The effect of anaerobic digestate tea on the growth of lemon grass (Cymbopogan citratus)

Rowe

Weekes

Browne

et al. 2023

Biofuels Bioprod Bioref

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In this paper, we present the novel use of digestate tea to boost the rates of growth of Cymbopogan citratus, the lemon grass plant. The digestate was sourced from a functioning anaerobic digester at the University of the West Indies Cave Hill Campus, and made into a slurry (digestate tea). The slurry was then applied to the plants in varying surface concentrations. The digestate tea had a profound effect on the growth rates of the plants and resulted in an eight times increase in the overall biomass yield at the highest concentration of digestate tea applied (0.21 ± 0.06 kg, 5.5 L m−2), when compared with the control (0.026 ± 0.004 kg, 0 L m−2). This type of fertilization can tremendously boost lemon grass production, and hence, the production of the valuable lemon grass essential oil in a sustainable and environmentally friendly manner. © 2023 Society of Industrial Chemistry and John Wiley & Sons Ltd.

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Biofertilizers from Wastewater: Strategy to Check Water Pollution and Chemical Fertilizers in Agriculture

Kumar,

Deepika,

Kapoor

et al. 2023

Springer Water

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Exploring technological alternatives of nutrient recovery from digestate as a secondary resource

Cited by 94 publications

References 95 publications

Digestate as Sustainable Nutrient Source for Microalgae—Challenges and Prospects

Digestate as Sustainable Nutrient Source for Microalgae—Challenges and Prospects

The effect of anaerobic digestate tea on the growth of lemon grass (Cymbopogan citratus)

Biofertilizers from Wastewater: Strategy to Check Water Pollution and Chemical Fertilizers in Agriculture

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