Nutrient Removal and Biogas Upgrading by Integrating Freshwater Algae Cultivation with Piggery Anaerobic Digestate Liquid Treatment
Abstract
An integrated approach that combined freshwater microalgae Scenedesmus obliquus (FACHB-31) cultivation with piggery anaerobic digestate liquid treatment was investigated in this study. The characteristics of algal growth, biogas production, and nutrient removal were examined using photobioreactor bags (PBRbs) to cultivate S. obliquus (FACHB-31) in digestate with various digestate dilutions (the concentration levels of 3200, 2200, 1600, 1200, 800, and 400 mg L(-1) chemical oxygen demand (COD)) during 7-day period. The effects of the level of pollutants on nutrient removal efficiency and CO2 removal process were investigated to select the optimum system for effectively upgrade biogas and simultaneously reduce the nutrient content in digestate. The treatment performance displayed that average removal rates of COD, total nitrogen (TN), total phosphorous (TP), and CO2 were 61.58-75.29, 58.39-74.63, 70.09-88.79, and 54.26-73.81 %, respectively. All the strains grew well under any the dilution treatments. With increased initial nutrient concentration to a certain range, the CO4 content (v/v) of raw biogas increased. Differences in the biogas enrichment of S. obliquus (FACHB-31) in all treatments mainly resulted from variations in biomass productivity and CO2 uptake. Notably, the diluted digestate sample of 1600 mg L(-1) COD provided an optimal nutrient concentration for S. obliquus (FACHB-31) cultivation, where the advantageous nutrient and CO2 removals, as well as the highest productivities of biomass and biogas upgrading, were revealed. Results showed that microalgal biomass production offered real opportunities to address issues such as CO2 sequestration, wastewater treatment, and biogas production.
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Algae can grow in diverse water types, including freshwater, saltwater, and wastewater.
“Algae can grow in diverse water types, including freshwater [70,71], saltwater [72][73][74], and even wastewater [72].”
From A Review of Algae-Based Carbon Capture, Utilization, and Storage (Algae-Based CCUS) (2024) · cites this paper as [71]
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- Authors
- Xu, J., Zhao, Y., Zhao, G., & Zhang, H.
- Affiliations
- Jiaxing University (CN)
- Fudan University (CN)
- Corresponding author
- Zhao, Yongjun
- Venue
- Applied Microbiology and Biotechnology
- Published
- 2015-03-26
- Volume
- 99
- Issue
- 15
- Pages
- 6493-6501
- ISSN
- 0175-7598 (ISSN-L)
- 1432-0614
- OpenAlex
- W1974031486
- Cited by
- 172
- References
- 32
- Citations by year
- 2026: 5 · 2025: 13 · 2024: 13 · 2023: 15 · 2022: 30 · 2021: 27 · 2020: 17 · 2019: 15 · 2018: 15 · 2017: 12 · 2016: 5 · 2015: 4
- FWCI
- 3.55
- Type
- journal article
- Language
- en
- Open access
- closed
- Licence
- www.springer.com/tdm (tdm)
- Locations
- Applied Microbiology and Biotechnology (publishedVersion)
- PubMed (publishedVersion)
- Funders
- National Natural Science Foundation of China
- Topics
- Physical Sciences › Energy › Renewable Energy, Sustainability and the Environment › Algal biology and biofuel production
- Physical Sciences › Engineering › Building and Construction › Anaerobic Digestion and Biogas Production
- Physical Sciences › Environmental Science › Environmental Chemistry › Aquatic Ecosystems and Phytoplankton Dynamics
- Keywords
- Scenedesmus obliquus, microalgae cultivation, digestate, biogas upgrading, nutrient removal, pig slurry, CO2 sequestration, photobioreactors, COD removal, nitrogen removal, phosphorus removal, microalgae productivity
- MeSH terms
- Chlorophyta, Anaerobiosis, Animals, Carbon Dioxide, Fresh Water, Manure, Nitrogen, Organic Chemicals, Phosphorus, Swine, Water Pollutants, Chemical, Biofuels, Biological Oxygen Demand Analysis
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