Attempts to alleviate inhibitory factors of anaerobic digestate for enhanced microalgae cultivation and nutrients removal: A review

Al-Mallahi, Jumana; Ishii, Kazuei

doi:10.1016/j.jenvman.2021.114266

Cited by 41 publications

(12 citation statements)

References 85 publications

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“…It could hence be assumed from previous results that an acidic pH had the potential to modify digestates properties, notably by increasing the nutrient availability, and hence shifting strain performances from one digestate to another. Similarly, digestates yielding less growth could have inhibitory factors specific to the tested strains [48]. The literature focuses on ammonium toxicity [49][50][51], but the digestate composition can be extremely complex and other inhibitory elements can be at play.…”

Section: Discussionmentioning

confidence: 99%

Microalgae Cultivation on Nutrient Rich Digestate: The Importance of Strain and Digestate Tailoring under PH Control

et al. 2022

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The bioremediation of digestate using microalgae presents a solution to the current eutrophication issue in Northwest Europe, where the use of digestate as soil fertiliser is limited, thus resulting in an excess of digestate. Ammonium is the main nutrient of interest in digestate for microalgal cultivation, and improving its availability and consequent uptake is crucial for optimal bioremediation. This work aimed to determine the influence of pH on ammonium availability in cultures of two green microalgae, additionally screened for their growth performances on three digestates produced from different feedstocks, demonstrating the importance of tailoring a microalgal strain and digestate for bioremediation purposes. Results showed that an acidic pH of 6–6.5 resulted in a better ammonium availability in the digestate media, translated into better growth yields for both S. obliquus (GR: 0.099 ± 0.001 day−1; DW: 0.23 ± 0.02 g L−1) and C. vulgaris (GR: 0.09 ± 0.001 day−1; DW: 0.49 ± 0.012 g L−1). This result was especially true when considering larger-scale applications where ammonium loss via evaporation should be avoided. The results also demonstrated that digestates from different feedstocks resulted in different growth yields and biomass composition, especially fatty acids, for which, a digestate produced from pig manure resulted in acid contents of 6.94 ± 0.033% DW and 4.91 ± 0.3% DW in S. obliquus and C. vulgaris, respectively. Finally, this work demonstrated that the acclimation of microalgae to novel nutrient sources should be carefully considered, as it could convey significant advantages in terms of biomass composition, especially fatty acids and carbohydrate, for which, this study also demonstrated the importance of harvesting time.

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Section: Discussionmentioning

confidence: 99%

Microalgae Cultivation on Nutrient Rich Digestate: The Importance of Strain and Digestate Tailoring under PH Control

et al. 2022

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“…Therefore, several technologies, such as reverse osmosis, ammonia removal, membrane separation, and evaporation, have been developed to concentrate nutrients in liquid digestate. The above technologies can concentrate up to 67% of the feedstock nitrogen and consume less than 10% of the energy that is generated during anaerobic digestion [112]. The concentrated fraction can serve as a liquid biofertilizer for agricultural purposes.…”

Section: Post-treatmentmentioning

confidence: 99%

Sustainable Management Strategies for Fruit Processing Byproducts for Biorefineries: A Review

Błaszczyk,

Sady,

Pachołek

et al. 2024

Sustainability

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The fruit processing industry generates enormous amounts of byproducts, which are primarily removed through landfill or incineration. However, these processes cause carbon dioxide and methane emissions and release dioxin into the environment. The management of fruit processing byproducts is important for reducing the amount of food waste that is sent to landfills and for developing strategies through the reuse of these products for valorization and economic added value. Fruit processing byproducts are rich sources of bioactive compounds and fermentable and nonfermentable sugars. Therefore, these materials are very attractive feedstocks for developing integrated multifeed biorefineries that coproduce a wide range of natural products and bioenergy. The studies presented here have shown sustainable strategies for managing fruit processing byproducts via a biorefinery approach to achieve full valorization via a circular economy. The full valorization project proposed five main phases, namely, pretreatment, extraction, dark or aerobic fermentation, anaerobic digestion, and post-treatment, as well as two additional pathways to generate additional bioelectricity. When choosing the appropriate directions for the presented concept, a technoeconomic analysis should be carried out, considering the type of biomass and its availability at the site of the biorefinery and throughout the year of production. Applying the proposed concept of biorefineries in closed-loop technology is a promising way to enhance economic efficiency and decrease environmental influence in accordance with sustainable development.

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“…After separation, the liquid fraction (80-90% of the digestate total mass) rich in N and K can be used, e.g., for microalgae cultivation (Al-Mallahi & Ishii, 2022). The digestate solid (10-20% of the digestate total mass) is rich in C and P. There are some strategies to utilise it in value-added materials, such as: composting into biofertiliser (Du et al, 2018), pyrolysis in biochar (Kumar et al, 2021), hydrothermal carbonisation into hydrochar (Parmar & Ross, 2019) or solid-state fermentation into hydrolytic enzymes, biosurfactants and biopesticides (Cerda et al, 2019).…”

Section: Anaerobic Fermentation (Anf)mentioning

confidence: 99%

Sustainable management of fruit waste production

Błaszczyk,

Sady,

Pachołek

2024

Sustainable Food. Production and Consumption Perspectives

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The main goal of this paper is to review sustainable strategies presented in the literature for managing fruit processing by-products according to the circular economy, which could be useful for companies. In the food processing of fruits, the waste can be utilised directly or indirectly. The direct utilisation of fruit waste does not ensure full valorisation and does not fully minimise the environmental impact. The most sustainable management for the full valorisation of fruit waste according to the circular economy is the indirect utilisation, which requires an energyintensive drying process before the biorefinery approach. Sustainable Development Goal (SDG) 12.3 promotes the reduction of food waste and food loss throughout the supply chain to achieve sustainable development by 2030, especially at retail and consumption levels. The fruit processing industry produces large amounts of by-products, mainly removed by landfilling or incineration. However, these methods cause emissions of carbon dioxide, methane and ammonia, and release dioxin into the environment. In addition, it causes a loss of valuable biomass and nutrients and an economic loss. The sustainable management of fruit processing by-products is important to reduce the amount of food waste deposited in landfills and to develop strategies through their reuse for full valorisation and added economic value. The currently proposed biorefinery only focuses on partial valorisation of fruit waste, which is not completely compatible with the closedloop economy framework and economically feasible due to the low-efficiency bioprocesses. Therefore, there is a need for sustainable conception in the biorefinery approach, which can provide full valorisation of fruit waste according to the circular economy.

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Attempts to alleviate inhibitory factors of anaerobic digestate for enhanced microalgae cultivation and nutrients removal: A review

Cited by 41 publications

References 85 publications

Microalgae Cultivation on Nutrient Rich Digestate: The Importance of Strain and Digestate Tailoring under PH Control

Microalgae Cultivation on Nutrient Rich Digestate: The Importance of Strain and Digestate Tailoring under PH Control

Sustainable Management Strategies for Fruit Processing Byproducts for Biorefineries: A Review

Sustainable management of fruit waste production

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