Simplified biogeochemical numerical model to predict pore fluid chemistry and calcite precipitation during biocementation of soil
نویسندگان
چکیده
Microbially induced calcite precipitation (MICP) technique has gained attention recently as a novel method to enhance the engineering properties of soils, especially sandy soils. However, applicability this field scale is challenging and requires understanding factors affecting MICP process under variable subsurface conditions. This study presents laboratory investigation numerical predictive model assess pore-water chemistry during biocementation process. Laboratory experiments were conducted microbial treatment Narmada sand in plastic tubes using three bacterial strains two cementation media concentrations. Calcite via ureolysis result biogeochemical reactions was measured. The effects pH electrical conductivity (EC) on rate urea hydrolysis assessed. presence crystals analyzed scanning electron microscopy (SEM). SEM images confirmed formation at surface between particles. A simplified developed estimate their sand. Three stages identified: ureolysis, dynamic equilibrium liquid-gas interface oversaturation ions, precipitation. variations EC these modeled. predicted pH, EC, based found be close agreement with experimental results. can used optimize system variables for effective applications.
منابع مشابه
Developing a Fuzzy Logic Model to Predict Asphaltene Precipitation during Natural Depletion based on Experimental Data
متن کامل
the innovation of a statistical model to estimate dependable rainfall (dr) and develop it for determination and classification of drought and wet years of iran
آب حاصل از بارش منبع تأمین نیازهای بی شمار جانداران به ویژه انسان است و هرگونه کاهش در کم و کیف آن مستقیماً حیات موجودات زنده را تحت تأثیر منفی قرار می دهد. نوسان سال به سال بارش از ویژگی های اساسی و بسیار مهم بارش های سالانه ایران محسوب می شود که آثار زیان بار آن در تمام عرصه های اقتصادی، اجتماعی و حتی سیاسی- امنیتی به نحوی منعکس می شود. چون میزان آب ناشی از بارش یکی از مولفه های اصلی برنامه ...
15 صفحه اولDevelopment and Evaluation of a Numerical Model being able to Simulate Soil Pore Size Change
The aim of the thesis is to develop a numerical model based on first principles for the simulation of change of size of soil pores during drying of soft soil. This model is suitable for the type of soil consisting of clay with layered structure, such as Montmorillonite. In this study, the geometry of the soil pore is idealized by a triangle consisting of three sand grains and clay fabrics conne...
متن کاملdeveloping a fuzzy logic model to predict asphaltene precipitation during natural depletion based on experimental data
متن کامل
Sr /Mg ratios of modern marine calcite: Empirical indicators of ocean chemistry and precipitation rate Scorn
Holocene biotic and abiotic marine calcite have a similar range of Mg contents (0 to 22 and 4 to 2 1 mol% MgC03, respectively), yet biotic calcite has Sr*+ concentrations that are consistently 1250 ppm higher than those of abiotic calcite. As in laboratory experiments, a positive linear relation is observed between Dsr and calcite Mg content. This produces two distinct linear trends on a plot o...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Arabian Journal of Geosciences
سال: 2021
ISSN: ['1866-7511', '1866-7538']
DOI: https://doi.org/10.1007/s12517-021-07151-x