Whey as an Alternative Nutrient Medium for Growth of Sporosarcina pasteurii and Its Effect on CaCO3 Polymorphism and Fly Ash Bioconsolidation

被引:12
|
作者
Chaparro, Sandra [1 ]
Rojas, Hugo A. [1 ]
Caicedo, Gerardo [1 ]
Romanelli, Gustavo [2 ]
Pineda, Antonio [3 ,4 ]
Luque, Rafael [3 ,4 ]
Martinez, Jose J. [1 ]
机构
[1] Pedag & Technol Univ Colombia, Fac Sci, Sch Chem Sci, Tunja 150001, Colombia
[2] Natl Univ La Plata, Res & Dev Ctr Appl Sci Dr Jorge Ronco, CCT La Plata, CONICET,CIC PBA, RA-1900 La Plata, Argentina
[3] Univ Cordoba, Dept Quim Organ, Ctra NNal IV-A,Km 396, E-14014 Cordoba, Spain
[4] Peoples Friendship Univ Russia, Sci Ctr Mol Design & Synth Innovat Cpds Med Ind, RUDN Univ, Moscow 117198, Russia
关键词
biogenic CaCO3; polymorphism; ureolytic bacteria; whey; MICROBIAL CARBONATE PRECIPITATION; CALCITE PRECIPITATION; BACTERIA; DURABILITY; MORPHOLOGY; MINERALS;
D O I
10.3390/ma14102470
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Whey in large quantities can cause environmental problems when discarded, because it reduces dissolved oxygen and aquatic life. Nonetheless, it could be used as an easily available and economical alternative to reduce culture medium costs in microbially induced calcium carbonate precipitation (MICP). In this work, a native Sporosarcina pasteurii was isolated and then cultured by using different proportions of whey (W) in nutrient broth (NB). The solids were characterized by XRD, FT-IR, TGA, and SEM. The potential applications in bioconsolidation were also studied. Whey concentration was directly related to CaCO3 production. Higher whey concentrations reduced calcium carbonate purity to nearly 80%. All experiments showed calcite and vaterite fractions, where a whey increment in the media increased calcite content and decreased vaterite content, causing a decrease in crystal size. MICP improved compressive strength (CS) in sand and fly ash. The best CS results were obtained by fly ash treated with 25 W-75 NB (37.2 kPa) and sand with 75 W-25 NB (32.1 kPa). Whey changed crystal polymorphism in biogenic CaCO3 production. Material bioconsolidation depends on the CaCO3 polymorph, thus fly ash was effectively bioconsolidated by crystallization of vaterite and sand by crystallization of calcite.
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页数:12
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