Towards a low CO2 emission building material employing bacterial metabolism (1/2): The bacterial system and prototype production
| Autor: | Sidsel Markussen, Pawel Sikorski, Y.J. Phua, Kjell D. Josefsen, Harald Throne-Holst, Anders Myhr, Alexander Wentzel, Simone Balzer Le, Ina Grosås Eikjeland, Anja Røyne |
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| Jazyk: | angličtina |
| Rok vydání: | 2019 |
| Předmět: |
0301 basic medicine
Urease Science 030106 microbiology chemistry.chemical_element Limestones Bacillus Calcium Calcium Carbonate 03 medical and health sciences chemistry.chemical_compound Soil Chemical Precipitation Humans Chemical precipitation Dissolution Multidisciplinary Aqueous solution biology Bacteria Construction Materials Hydrolysis Construction Industry Carbon Dioxide biology.organism_classification Sporosarcina pasteurii Glucose metabolisms 030104 developmental biology Calcium carbonate Glucose Chemical engineering chemistry Carbon dioxide Building materials biology.protein Carbonate Medicine |
| Zdroj: | PLoS ONE PLoS ONE, Vol 14, Iss 4, p e0212990 (2019) |
| ISSN: | 1932-6203 |
| Popis: | The production of concrete for construction purposes is a major source of anthropogenic CO2 emissions. One promising avenue towards a more sustainable construction industry is to make use of naturally occurring mineral-microbe interactions, such as microbial-induced carbonate precipitation (MICP), to produce solid materials. In this paper, we present a new process where calcium carbonate in the form of powdered limestone is transformed to a binder material (termed BioZEment) through microbial dissolution and recrystallization. For the dissolution step, a suitable bacterial strain, closely related to Bacillus pumilus, was isolated from soil near a limestone quarry. We show that this strain produces organic acids from glucose, inducing the dissolution of calcium carbonate in an aqueous slurry of powdered limestone. In the second step, the dissolved limestone solution is used as the calcium source for MICP in sand packed syringe moulds. The amounts of acid produced and calcium carbonate dissolved are shown to depend on the amount of available oxygen as well as the degree of mixing. Precipitation is induced through the pH increase caused by the hydrolysis of urea, mediated by the enzyme urease, which is produced in situ by the bacterium Sporosarcina pasteurii DSM33. The degree of successful consolidation of sand by BioZEment was found to depend on both the amount of urea and the amount of glucose available in the dissolution reaction. Open Access. Research accepted by PLOS journals is published under a CC BY license. Anyone may reuse the article with proper attribution. |
| Databáze: | OpenAIRE |
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