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Polymer-assisted enzyme induced carbonate precipitation for non-ammonia emission soil stabilization

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Title: Polymer-assisted enzyme induced carbonate precipitation for non-ammonia emission soil stabilization
Authors: Yan, Zhen Browse this author
Gowthaman, Sivakumar Browse this author
Nakashima, Kazunori Browse this author
Kawasaki, Satoru Browse this author →KAKEN DB
Issue Date: 25-May-2022
Publisher: Nature Portfolio
Journal Title: Scientific reports
Volume: 12
Issue: 1
Start Page: 8821
Publisher DOI: 10.1038/s41598-022-12773-6
Abstract: Biocementation using enzyme induced carbonate precipitation (EICP) process has become an innovative method for soil improvement. One of the major limitations in scaling-up of biocement treatment is the emission of gaseous ammonia during the urea hydrolysis, which is environmentally hazardous. In order to eliminate this shortcoming, this paper presents a series of experiments performed to evaluate a novel approach for preventing the ammonia byproducts in the EICP process via the use of polyacrylic acid (PAA). Through the adjustment of the pH to acidic, PAA not only promotes the enzyme activity, but also averts the conversion of ammonium to gaseous ammonia and its release, thus preventing any harm to the environment. The sand samples were treated with cementation solution and assessed for improvement in strength. Calcium carbonate content measurements and X-ray powder diffraction analysis identified the calcite crystals precipitated in the soil pores. Scanning electron microscopy analysis clearly showed that calcium carbonate was precipitated connecting soil particles, thus providing a uniaxial compressive strength (UCS) of up to 1.65 MPa. Overall, the inhibition in the speciation of gaseous ammonia shows the great potential of PAA for large-scale promotion of biocement.
Type: article
Appears in Collections:工学院・工学研究院 (Graduate School of Engineering / Faculty of Engineering) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

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