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  1. Article ; Online: Expert elicitation of the timing and uncertainty to establish a geologic sequestration well for CO

    Moore, Emily J / Karplus, Valerie J / Morgan, M Granger

    Proceedings of the National Academy of Sciences of the United States of America

    2023  Volume 121, Issue 1, Page(s) e2307984120

    Abstract: Many studies anticipate that carbon capture and sequestration (CCS) will be essential to decarbonizing the U.S. economy. However, prior work has not estimated the time required to develop, approve, and implement a geologic sequestration site in the ... ...

    Abstract Many studies anticipate that carbon capture and sequestration (CCS) will be essential to decarbonizing the U.S. economy. However, prior work has not estimated the time required to develop, approve, and implement a geologic sequestration site in the United States. We generate such an estimate by identifying six clearance points that must be passed before a sequestration site can become operational. For each clearance point (CP), we elicit expert judgments of the time required in the form of probability distributions and then use stochastic simulation to combine and sum the results. We find that, on average, there is a 90% chance that the time required lies between 5.5 and 9.6 y, with an upper bound of 12 y. Even using the most optimistic expert judgements, the lower bound on time is 2.7 y, and the upper bound is 8.3 y. Using the most pessimistic judgements, the lower bound is 3.5 y and the upper bound is 19.2 y. These estimates suggest that strategies must be found to safely accelerate the process. We conclude the paper by discussing seven potential strategies.
    Language English
    Publishing date 2023-12-18
    Publishing country United States
    Document type Journal Article
    ZDB-ID 209104-5
    ISSN 1091-6490 ; 0027-8424
    ISSN (online) 1091-6490
    ISSN 0027-8424
    DOI 10.1073/pnas.2307984120
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  2. Article: Maximum CO2 Utilization by Nutritious Microalgae

    Molitor, Hannah R / Moore, Emily J / Schnoor, Jerald L

    ACS sustainable chemistry & engineering. 2019 Apr. 30, v. 7, no. 10

    2019  

    Abstract: High-protein microalgae are a promising alternative to soy for more rapidly and sustainably produced protein-rich animal feed. However, there are still significant barriers to be overcome in growing nutritious microalgae, recovering nutrients from ... ...

    Abstract High-protein microalgae are a promising alternative to soy for more rapidly and sustainably produced protein-rich animal feed. However, there are still significant barriers to be overcome in growing nutritious microalgae, recovering nutrients from wastewater, and fixing CO2 from flue gas in full-scale sustainable operations. Currently, it is generally assumed that nutritious microalgae, including Scenedesmus obliquus, are inhibited by CO2 levels characteristic of industrial flue gases. Experiments in a 2 L photobioreactor with the ability to control CO2 concentrations and pH demonstrated that the inhibition of S. obliquus was not important until 10% CO2 and was not prohibitively reduced even at 35% CO2. The rate of growth exceeded all values in the literature for S. obliquus at concentrations greater than 2.5% CO2, and the amino acid content of the microalgae was equal or superior to that of soy. A substrate inhibition model indicated that CO2 levels comparable to flue gases do not substantially inhibit S. obliquus growth, with careful pH control. The model indicated maximum biomass productivity of 640 ± 100 mg L–1 d–1 at 4.5% CO2 (Km of 0.8 ± 0.4% CO2, Ki of 26 ± 9% CO2, and vmax of 860 ± 120 mg L–1 d–1), which exceeds previously measured biomass productivity values at inhibitory CO2 concentrations. Protein contents of S. obliquus and soy were comparable.
    Keywords amino acid composition ; biomass production ; carbon dioxide ; feeds ; flue gas ; microalgae ; models ; nutrients ; pH ; photobioreactors ; protein content ; Scenedesmus obliquus ; wastewater
    Language English
    Dates of publication 2019-0430
    Size p. 9474-9479.
    Publishing place American Chemical Society
    Document type Article
    ISSN 2168-0485
    DOI 10.1021/acssuschemeng.9b00656
    Database NAL-Catalogue (AGRICOLA)

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