Microalgal cultivation for the upgraded biogas by removing CO2, coupled with the treatment of slurry from anaerobic digestion: A review

Yang, Wei; Li, Shuangxi; Qu, Mingxiang; Dai, Dian; Liu, Dongyang; Wang, Wei; Tang, Chunming; Zhu, Linna

doi:10.1016/j.biortech.2022.128118

Cited by 23 publications

(5 citation statements)

References 81 publications

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“…Digestate was demonstrated to be suitable for the mixotrophic cultivation of microalgae [383][384][385]. Biogas upgrade to biomethane is feasible by cultivating microalgae in the liquid digestatebased medium for CO 2 sequestration [386][387][388].…”

Section: Nitrogen Sulfur and Phosphate Recovery During The Anaerobic ...mentioning

confidence: 99%

Closing the Nutrient Loop—The New Approaches to Recovering Biomass Minerals during the Biorefinery Processes

Constantinescu-Aruxandei

Oancea

2023

IJERPH

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The recovery of plant mineral nutrients from the bio-based value chains is essential for a sustainable, circular bioeconomy, wherein resources are (re)used sustainably. The widest used approach is to recover plant nutrients on the last stage of biomass utilization processes—e.g., from ash, wastewater, or anaerobic digestate. The best approach is to recover mineral nutrients from the initial stages of biomass biorefinery, especially during biomass pre-treatments. Our paper aims to evaluate the nutrient recovery solutions from a trans-sectorial perspective, including biomass processing and the agricultural use of recovered nutrients. Several solutions integrated with the biomass pre-treatment stage, such as leaching/bioleaching, recovery from pre-treatment neoteric solvents, ionic liquids (ILs), and deep eutectic solvents (DESs) or integrated with hydrothermal treatments are discussed. Reducing mineral contents on silicon, phosphorus, and nitrogen biomass before the core biorefinery processes improves processability and yield and reduces corrosion and fouling effects. The recovered minerals are used as bio-based fertilizers or as silica-based plant biostimulants, with economic and environmental benefits.

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Section: Nitrogen Sulfur and Phosphate Recovery During The Anaerobic ...mentioning

confidence: 99%

Closing the Nutrient Loop—The New Approaches to Recovering Biomass Minerals during the Biorefinery Processes

Constantinescu-Aruxandei

Oancea

2023

IJERPH

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“…1 Except for the environment and climate, the monitoring of carbon dioxide finds significant application across diverse fields, including industrial manufacturing, 2 pharmaceutical production, 3,4 and biological application. 5 In the realm of gas sensing, several methodologies exist, such as electrochemical, semiconductor, and optical sensors. 6 Among these, optical sensors stand out for their superior sensitivity and selectivity.…”

Section: Introductionmentioning

confidence: 99%

“…Among these gases, carbon dioxide is of paramount importance due to its substantial contribution to the greenhouse effect 1 . Except for the environment and climate, the monitoring of carbon dioxide finds significant application across diverse fields, including industrial manufacturing, 2 pharmaceutical production, 3,4 and biological application 5 …”

Section: Introductionmentioning

confidence: 99%

Ppb‐level CO₂ sensor based on a miniature multipass cell with eight‐petaled spot pattern

Wang,

Lin,

Zeng

et al. 2024

Micro & Optical Tech Letters

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This paper presents an innovative carbon dioxide sensor leveraging a dense‐pattern multipass absorption cell. This novel design dramatically compacts an extensive optical path of approximately 11.4 m into a 70 mm inter‐mirror distance, effectively enhancing the system's sensitivity and reducing its size. Utilizing a 2004 nm diode laser, the sensor accurately targets a potent CO2 absorption line at 4989.9 cm−1. Experimental validation reveals remarkable linearity (R² = .999) and a detection limit of 59 ppb with 1 s integration time. The incorporation of Kalman filtering techniques further refines the sensor's performance, reducing the detection limit to 30 ppb—a substantial improvement of 49%. This advancement in sensor technology marks a significant step forward in efficient and precise CO2 monitoring.

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“…Therefore, microalgal strains that are acclimated to high levels of CO 2 are preferred for a successful process. In the culture medium used for algal production, wastewater is occasionally added to remove nitrogen and phosphorus as well as to stimulate algal growth [10,11]. Although algal biomass produced in wastewater can be used as a feedstock for biofuel production, it is not suitable for use as food/feed additives or nutraceuticals, from the hygienic standpoint.…”

Section: Introductionmentioning

confidence: 99%

Biogas Upgrading by Wild Alkaliphilic Microalgae and the Application Potential of Their Biomass in the Carbon Capture and Utilization Technology

Kikuchi,

Kanai,

Sugiyama

et al. 2024

Fermentation

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Although biogas is a renewable energy source alternative to natural gas, it contains approximately 40 vol% CO2 and, hence, a low calorific value. The sequestration of CO2 from biogas is, therefore, essential before its widespread use. As CO2 can be easily solubilized as carbonate and bicarbonate in alkaline water, in this study, we isolated and characterized alkaliphilic wild microalgae that grow under high-level CO2 conditions and evaluated their application potential in CO2-removal from biogas. For this purpose, freshwater samples were enriched with 10 vol% CO2 and an alkaline culture medium (pH 9.0), wherein almost free CO2 was converted to carbonate and bicarbonate to yield alkaliphilic and high-level CO2-tolerant microalgae. Ten microalgal strains of Micractinium, Chlorella, Scenedesmus/Tetradesmus, or Desmodesmus spp. were isolated, some of which demonstrated good growth even under conditions of >pH 10 and >30 vol% CO2. All algal strains grew well through fixing biogas-derived CO2 in a vial-scale biogas upgrading experiment, which reduced the CO2 level in biogas to an undetectable level. These strains yielded antioxidant carotenoids, including lutein, astaxanthin, zeaxanthin, and β-carotene, particularly rich in lutein (up to 7.3 mg/g dry cells). In addition, these strains contained essential amino acids, accounting for 42.9 mol% of the total amino acids on average, and they were rich in unsaturated fatty acids (comprising 62.2 wt% of total fatty acids). The present study identified strains that can contribute to biogas upgrading technology, and the present findings suggest that their biomass can serve as useful raw material across the food, nutraceutical, and feed industries.

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Microalgal cultivation for the upgraded biogas by removing CO2, coupled with the treatment of slurry from anaerobic digestion: A review

Cited by 23 publications

References 81 publications

Closing the Nutrient Loop—The New Approaches to Recovering Biomass Minerals during the Biorefinery Processes

Closing the Nutrient Loop—The New Approaches to Recovering Biomass Minerals during the Biorefinery Processes

Ppb‐level CO₂ sensor based on a miniature multipass cell with eight‐petaled spot pattern

Biogas Upgrading by Wild Alkaliphilic Microalgae and the Application Potential of Their Biomass in the Carbon Capture and Utilization Technology

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Microalgal cultivation for the upgraded biogas by removing CO2, coupled with the treatment of slurry from anaerobic digestion: A review

Cited by 23 publications

References 81 publications

Closing the Nutrient Loop—The New Approaches to Recovering Biomass Minerals during the Biorefinery Processes

Closing the Nutrient Loop—The New Approaches to Recovering Biomass Minerals during the Biorefinery Processes

Ppb‐level CO2 sensor based on a miniature multipass cell with eight‐petaled spot pattern

Biogas Upgrading by Wild Alkaliphilic Microalgae and the Application Potential of Their Biomass in the Carbon Capture and Utilization Technology

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Product

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Ppb‐level CO₂ sensor based on a miniature multipass cell with eight‐petaled spot pattern