Evaluation of the Enzyme-Based Ground Improvement Technique for Peat

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  • HATA Toshiro
    Environmental Engineering, Graduate School of Engineering, Toyama Prefectural University
  • SATO Atsuko
    The Civil Engineering Research Institute for Cold Region.

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  • 泥炭を対象とした地盤改良技術における酵素法の適用性評価
  • デイタン オ タイショウ ト シタ ジバン カイリョウ ギジュツ ニ オケル コウソホウ ノ テキヨウセイ ヒョウカ

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Abstract

In order to confirm the efficacy of the carbonate precipitation method based on an enzyme catalyst and microbial functions in increasing peat strength, we performed laboratory tests with the urease enzyme and a urease-producing bacterium from peat and measured ammonia-nitrogen and nitrate-nitrogen concentration, unconfined compressive strength, and diversity of the microbial community by using next generation DNA sequencing. We then investigated the influence of the conditions used during the addition of the urease enzyme and the subsequent increase in the population of the urease-producing bacterium during the test term. From the results obtained, it was found that the addition of the urease enzyme increased calcite precipitation and also increased the unconfined compressive strength(over 50kN/m2) and the production of ammonium ions; this increase in the concentration of ammonium ions increased the pH of the peat. We also found a change in the composition of the microbial community under the carbonate precipitation conditions.

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