1. Introduction
Current soil improvement techniques (i.e. the usage
of cement and chemical additions) use large amount of
energy, man-made materials and create environmental
concerns. Recently, the new technique using microbial
biotechnology for producing biocement is being
interest due to environmentally friendly, low-energy
input and also microorganisms used in the process are
non-pathogen. Furthermore, unlike the use of cement,
soils in the fields can even be treated or improved
without disturbing the ground or environment as
microorganisms can penetrate and reproduce
themselves in the soil naturally. It has been reviewed
that some microorganisms i.e. Bacillus sp. and
Sporosarcina sp. in the medium contained urea and
calcium ion can induce precipitation of calcite [1-3].
Thus, new exciting opportunities for utilizing
biological processes to improve soil properties have
recently emerged. These opportunities have been
enabled through interdisciplinary research at variety of
fields including microbiology, geochemistry, and civil
engineering.
Calcium carbonate (CaCO3) precipitation is a
common natural phenomenon found in the
environments that are oversaturated in carbonate ions,
i.e. underground water, sea water, and soils. It has a
great importance in many environmental and civil
engineering applications. Generally, this process can
occur via abiotic and biotic pathways. Biologically
induced CaCO3 precipitation by ureolytic bacteria has
been proposed for several biotechnological
applications. This article paid attention to research
background on biological mechanisms of CaCO3
precipitation and illustration of biocementation
technique for improving the engineering properties of
soils. Example of this technique was applied in sandy
soil. The source of urea degrading bacteria was
originated from natural water (Chaophraya River,
Thailand), where the bacterial community is mixed
cultures. Non-destructive test using shear wave
technique was applied to measure strength
development in biocementing process. The potential
use of microbially induced CaCO3 precipitation as a
soil biocement is discussed.
1. Introduction
Current soil improvement techniques (i.e. the usage
of cement and chemical additions) use large amount of
energy, man-made materials and create environmental
concerns. Recently, the new technique using microbial
biotechnology for producing biocement is being
interest due to environmentally friendly, low-energy
input and also microorganisms used in the process are
non-pathogen. Furthermore, unlike the use of cement,
soils in the fields can even be treated or improved
without disturbing the ground or environment as
microorganisms can penetrate and reproduce
themselves in the soil naturally. It has been reviewed
that some microorganisms i.e. Bacillus sp. and
Sporosarcina sp. in the medium contained urea and
calcium ion can induce precipitation of calcite [1-3].
Thus, new exciting opportunities for utilizing
biological processes to improve soil properties have
recently emerged. These opportunities have been
enabled through interdisciplinary research at variety of
fields including microbiology, geochemistry, and civil
engineering.
Calcium carbonate (CaCO3) precipitation is a
common natural phenomenon found in the
environments that are oversaturated in carbonate ions,
i.e. underground water, sea water, and soils. It has a
great importance in many environmental and civil
engineering applications. Generally, this process can
occur via abiotic and biotic pathways. Biologically
induced CaCO3 precipitation by ureolytic bacteria has
been proposed for several biotechnological
applications. This article paid attention to research
background on biological mechanisms of CaCO3
precipitation and illustration of biocementation
technique for improving the engineering properties of
soils. Example of this technique was applied in sandy
soil. The source of urea degrading bacteria was
originated from natural water (Chaophraya River,
Thailand), where the bacterial community is mixed
cultures. Non-destructive test using shear wave
technique was applied to measure strength
development in biocementing process. The potential
use of microbially induced CaCO3 precipitation as a
soil biocement is discussed.
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1. Introduction
Current soil improvement techniques (i.e. the usage
of cement and chemical additions) use large amount of
energy, man-made materials and create environmental
concerns. Recently, the new technique using microbial
biotechnology for producing biocement is being
interest due to environmentally friendly, low-energy
input and also microorganisms used in the process are
non-pathogen. Furthermore, unlike the use of cement,
soils in the fields can even be treated or improved
without disturbing the ground or environment as
microorganisms can penetrate and reproduce
themselves in the soil naturally. It has been reviewed
that some microorganisms i.e. Bacillus sp. and
Sporosarcina sp. in the medium contained urea and
calcium ion can induce precipitation of calcite [1-3].
Thus, new exciting opportunities for utilizing
biological processes to improve soil properties have
recently emerged. These opportunities have been
enabled through interdisciplinary research at variety of
fields including microbiology, geochemistry, and civil
engineering.
Calcium carbonate (CaCO3) precipitation is a
common natural phenomenon found in the
สภาพแวดล้อมที่ oversaturated ในไอออนคาร์บอเนต
เช่นใต้ดิน น้ำ ดิน ทะเล และ มันมีความสำคัญมาก
ในหลายด้านสิ่งแวดล้อมและงานวิศวกรรมโยธา
โดยทั่วไปแล้ว กระบวนการนี้สามารถเกิดขึ้นได้ผ่านการทดลองทางชีวภาพ
และ . การตกตะกอนชีวภาพ
แป้ง โดย ureolytic แบคทีเรียมีการเสนอหลายเทคโนโลยีชีวภาพ
โปรแกรม This article paid attention to research
background on biological mechanisms of CaCO3
precipitation and illustration of biocementation
technique for improving the engineering properties of
soils. Example of this technique was applied in sandy
soil. The source of urea degrading bacteria was
originated from natural water (Chaophraya River,
Thailand), where the bacterial community is mixed
cultures.ไม่ทำลายการทดสอบโดยใช้เทคนิคของคลื่นแรงเฉือน คือ นำไปวัดความแข็งแรง
biocementing พัฒนาในกระบวนการ ศักยภาพของการตกตะกอน microbially
แป้งเป็นดิน biocement กล่าวถึง .
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