Batch cultivation of microalgae in anaerobic digestate exhibits functional changes in bacterial communities impacting nitrogen removal and wastewater treatment

Ayre, Jeremy Miles; Mickan, Bede S.; Jenkins, Sue; Moheimani, Navid R.

doi:10.1016/j.algal.2021.102338

Cited by 26 publications

(5 citation statements)

References 90 publications

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“…Phosphate is essential for building up deoxyribonucleic acid and nucleic acids of the algal cells and represents 82-90% of total phosphorus. The chemical oxygen demand of the digestate highly fluctuated from 210 to 6900 mg/L, including volatile fatty acids (Ayre et al 2021). The inorganic carbon sources are mainly bicarbonate (939-1353 mg/L) in the digestate.…”

Section: Digestate Types Sources and Characterizationmentioning

confidence: 99%

Cultivation of microalgae on liquid anaerobic digestate for depollution, biofuels and cosmetics: a review

et al. 2022

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Solid wastes from domestic, industrial and agricultural sectors cause acute economic and environmental problems. These issues can be partly solved by anaerobic digestion of wastes, yet this process is incomplete and generates abundant byproducts as digestate. Therefore, cultivating mixotrophic algae on anaerobic digestate appears as a promising solution for nutrient recovery, pollutant removal and biofuel production. Here we review mixotrophic algal cultivation on anaerobic waste digestate with focus on digestate types and characterization, issues of recycling digestate in agriculture, removal of contaminants, and production of biofuels such as biogas, bioethanol, biodiesel and dihydrogen. We also discuss applications in cosmetics and economical aspects. Mixotrophic algal cultivation completely removes ammonium, phosphorus, 17β-estradiol from diluted digestate, and removes 62% of zinc, 84% of manganese, 74% of cadmium and 99% of copper.

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Section: Digestate Types Sources and Characterizationmentioning

confidence: 99%

Cultivation of microalgae on liquid anaerobic digestate for depollution, biofuels and cosmetics: a review

et al. 2022

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“…Ayre et al [144] cultivated Chlorella sp. in anaerobic digestate of piggery effluent and characterized the bacterial community using 16S rRNA sequencing followed by an in silico analysis of functional N and C cycling genes and established that Chlorella form symbiotic relationships with many bacterial groups belonging to bacteriodetes, cyanobacteria, and nitrifying and N-fixing bacteria and promote NH 4 + and NO 2 − removal via nitrification and denitrification pathways, while accumulating NO 3 − that can be reused as a N fertilizer.…”

Section: Synergistic Effect Of Algal-bacterial Co-cultivation In Wast...mentioning

confidence: 99%

Integrated Approach for Carbon Sequestration and Wastewater Treatment Using Algal–Bacterial Consortia: Opportunities and Challenges

Shashirekha

Perumal

Sundaram³

2022

Sustainability

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Increasing concentrations of carbon dioxide (CO2), one of the important greenhouse gases, due to combustion of fossil fuels, particularly burning coal, have become the major cause for global warming. As a consequence, many research programs on CO2 management (capture, storage, and sequestration) are being highlighted. Biological sequestration of CO2 by algae is gaining importance, as it makes use of the photosynthetic capability of these aquatic species to efficiently capture CO2 emitted from various industries and converting it into algal biomass as well as a wide range of metabolites such as polysaccharides, amino acids, fatty acids, pigments, and vitamins. In addition, their ability to thrive in rugged conditions such as seawater, contaminated lakes, and even in certain industrial wastewaters containing high organic and inorganic nutrients loads, has attracted the attention of researchers to integrate carbon capture and wastewater treatment. Algae offer a simple solution to tertiary treatments due to their nutrient removal efficiency, particularly inorganic nitrogen and phosphorus uptake. The algal–bacterial energy nexus is an important strategy capable of removing pollutants from wastewater in a synergistic manner. This review article highlights the mechanism involved in biological fixation of CO2 by microalgae, their cultivation systems, factors influencing algal cultivation in wastewater and CO2 uptake, the effect of co-cultivation of algae and bacteria in wastewater treatment systems, and challenges and opportunities.

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“…and Chlorella sp. in the anaerobic digestion of piggery effluent demonstrated functional changes in bacterial communities that improve nitrogen removal and, accordingly, the efficiency of biological wastewater treatment (Ayre et al, 2021). Wastewater treatment plant digestate can be an effective substrate for the growth of mixed microalgal culture dominated by Scenedesmus sp., promoting the increase in biomass total suspended solids as high as 2.6 g/L with a growth rate up to 0.9 day −1 (Uggetti et al, 2014).…”

Section: Introductionmentioning

confidence: 99%

Towards Increasing the Utilization of Anaerobic Digestate from Biogas Production in Agrotechnologies

Tymchuk

Malovanyy

Zhuk

et al. 2023

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The paper presents the results of a comprehensive study that focused on the composition and properties of digestate obtained through mesophilic anaerobic co-fermentation of broadleaf cattail suspensions with yeast waste inoculum. Additionally, bioindication studies were conducted to evaluate the effect of the digestate on the germination of ryegrass and barley under lab-scale conditions. The initial total solids in suspensions before digestion varied from 5%wt. to 10%wt., and the mass fraction of the inoculum ranged from 0.05 to 0.2. Through thermogravimetric analysis, it was observed that digestate samples with higher initial inoculum content exhibited lower thermal stability. One of the limiting factors for the use of digestate was its high water content, ranging from 95.6% to 97.9%. To address the high water content, centrifugation of the digestate samples was performed for 2 minutes at 5000 rpm. This process led to significant dewatering, particularly for samples with a higher inoculum content. The maximum possible reduction in water content of the digestate was achieved at 31.65%. The bioindication study involved evaluating the germination of ryegrass and barley in soil samples with different digestate content. The results indicated that the highest germination rates were achieved with a digestate content of 20%wt. For ryegrass, the germination rate was 93.33%, which was 1.67% higher than the soil control sample and 0.33% higher than the sterile control. Similarly, for barley, the germination rate was 91.33%, surpassing the soil control by 4.00% and the sterile control by 0.67%. The findings of this study confirm the potential of utilizing digestate in agricultural technologies as an additional source of plant nutrients. The comprehensive analysis of the digestate's composition, properties, and its positive impact on germination rates further supports its viability as a valuable resource in agricultural practices.

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Batch cultivation of microalgae in anaerobic digestate exhibits functional changes in bacterial communities impacting nitrogen removal and wastewater treatment

Cited by 26 publications

References 90 publications

Cultivation of microalgae on liquid anaerobic digestate for depollution, biofuels and cosmetics: a review

Cultivation of microalgae on liquid anaerobic digestate for depollution, biofuels and cosmetics: a review

Integrated Approach for Carbon Sequestration and Wastewater Treatment Using Algal–Bacterial Consortia: Opportunities and Challenges

Towards Increasing the Utilization of Anaerobic Digestate from Biogas Production in Agrotechnologies

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