Analysis of Dielectric Properties and Influencing Factors of Zn Contaminated Soil

2021 ◽  
pp. 105-114
Author(s):  
Jiaqi Li ◽  
Xianggui Xiao ◽  
Jipeng Wang ◽  
Zonghui Liu ◽  
Kang Lin
Keyword(s):  
Dielectric Properties ◽  
Influencing Factors ◽  
Contaminated Soil

scholarly journals Use of Modern Regression Analysis in the Dielectric Properties of Foods

Foods ◽  
2020 ◽  
Vol 9 (10) ◽  
pp. 1472
Author(s):  
Yu-Kai Weng ◽  
Jiunyuan Chen ◽  
Ching-Wei Cheng ◽  
Chiachung Chen
Keyword(s):  
Regression Analysis ◽  
Dielectric Properties ◽  
Influencing Factors ◽  
Polynomial Regression ◽  
Treatment Method ◽  
Regression Equations ◽  
Constant Variance ◽  
Dependent Variables ◽  
Qualitative Variables ◽  
The Relationship

The dielectric properties of food materials is used to describe the interaction of foods with electromagnetic energy for food technology and engineering. To quantify the relationship between dielectric properties and influencing factors, regression analysis is used in our study. Many linear or polynomial regression equations are proposed. However, the basic assumption of the regression analysis is that data with a normal distribution and constant variance are not checked. This study uses sixteen datasets from the literature to derive the equations for dielectric properties. The dependent variables are the dielectric constant and the loss factor. The independent variables are the frequency, temperature, and moisture content. The dependent variables and frequency terms are transformed for regression analysis. The effect of other qualitative factors, such as treatment method and the position of subjects on dielectric properties, are determined using categorical testing. Then, the regression equations can be used to determine which influencing factors are important and which are not. The method can be used for other datasets of dielectric properties to classify influencing factors, including quantitative and qualitative variables.

scholarly journals Characterization on the rhizoremediation of petroleum contaminated soil as affected by different influencing factors

2010 ◽  
Vol 7 (3) ◽  
pp. 4665-4688 ◽  
Author(s):  
J. Tang ◽  
R. Wang ◽  
X. Niu ◽  
M. Wang ◽  
Q. Zhou
Keyword(s):  
Plant Growth ◽  
Influencing Factors ◽  
Tall Fescue ◽  
Contaminated Soil ◽  
Petroleum Hydrocarbon ◽  
Initial Period ◽  
Plant Growth Promoting Rhizobacteria ◽  
Slow Increase ◽  
Continuous Increase ◽  
Petroleum Contaminated Soil

Abstract. In this paper, pilot experiments were conducted to analyze the effect of different environmental factors on the rhizoremediation of petroleum contaminated soil. Different plant species (cotton, ryegrass, tall fescue, and alfalfa), addition of fertilizer, different concentration of TPH in soil, bioaugmentation with effective microbial agent (EMA) and PGPR, and remediation time were tested as influencing factors during bioremediation process of Total Petroleum Hydrocarbon (TPH). The result shows that the remediation process can be enhanced by different plants species with the following order: tall fescue > ryegrass > alfalfa > cotton. The degradation rate of TPH increased with increased fertilizer addition and moderate level of 20 g/m2 urea is best for both plant growth and TPH remediation. High TPH content is toxic to plant growth and inhibits the degradation of petroleum hydrocarbon with 5% TPH content showing the best degradation result in soil planted with ryegrass. Bioaugmentation with different bacteria and plant growth promoting rhizobacteria (PGPR) showed the following results for TPH degradation: cotton + EMA + PGPR > cotton + EMA > cotton + PGPR > cotton > control. Rapid degradation of TPH was found at the initial period of remediation caused by the activity of microorganisms, continuous increase was found from 30–90 d period and slow increase was found from 90 to 150 d. The result suggests that rhizoremediation can be enhanced with the proper control of different influencing factors that affect both plant growth and microbial activity in the rhizosphere environment.

scholarly journals Open-Ended Coaxial Probe Measurements of Complex Dielectric Permittivity in Diesel-Contaminated Soil during Bioremediation

Sensors ◽  
2020 ◽  
Vol 20 (22) ◽  
pp. 6677
Author(s):  
Andrea Vergnano ◽  
Alberto Godio ◽  
Carla Maria Raffa ◽  
Fulvia Chiampo ◽  
Jorge A. Tobon Vasquez ◽  
...  
Keyword(s):  
Dielectric Properties ◽  
Dielectric Permittivity ◽  
Moisture Content ◽  
Contaminated Soil ◽  
Contaminated Soils ◽  
Complex Dielectric Permittivity ◽  
Imaginary Component ◽  
Real Component ◽  
The Real ◽  
Coaxial Probe

In the bioremediation field, geophysical techniques are commonly applied, at lab scale and field scale, to perform the characterization and the monitoring of contaminated soils. We propose a method for detecting the dielectric properties of contaminated soil during a process of bioremediation. An open-ended coaxial probe measured the complex dielectric permittivity (between 0.2 and 20 GHz) on a series of six soil microcosms contaminated by diesel oil (13.5% Voil/Vtot). The microcosms had different moisture content (13%, 19%, and 24% Vw/Vtot) and different salinity due to the addition of nutrients (22 and 15 g/L). The real and the imaginary component of the complex dielectric permittivity were evaluated at the initial stage of contamination and after 130 days. In almost all microcosms, the real component showed a significant decrease (up to 2 units) at all frequencies. The results revealed that the changes in the real part of the dielectric permittivity are related to the amount of degradation and loss in moisture content. The imaginary component, mainly linked to the electrical conductivity of the soil, shows a significant drop to almost 0 at low frequencies. This could be explained by a salt depletion during bioremediation. Despite a moderate accuracy reduction compared to measurements performed on liquid media, this technology can be successfully applied to granular materials such as soil. The open-ended coaxial probe is a promising instrument to check the dielectric properties of soil to characterize or monitor a bioremediation process.

Laboratory study on the dielectric properties of contaminated soil using CPT deployed probe

2007 ◽  
Vol 11 (2) ◽  
pp. 121-130 ◽  
Author(s):  
Yong Sung Kim ◽  
Myoung Hak Oh ◽  
Junboum Park
Keyword(s):  
Dielectric Properties ◽  
Laboratory Study ◽  
Contaminated Soil

Dielectric properties of contaminated soil

1999 ◽  
Author(s):  
Yi Huang ◽  
Michael T. Fang ◽  
Van T. Nguyen ◽  
Asger Eriksen
Keyword(s):  
Dielectric Properties ◽  
Contaminated Soil

Influences of Biochar Aging Processes by Eco-Environmental Conditions

2013 ◽  
Vol 790 ◽  
pp. 467-470 ◽  
Author(s):  
Lu Lu Kong ◽  
Qi Xing Zhou
Keyword(s):  
Organic Matter ◽  
High Temperature ◽  
Soil Organic Matter ◽  
Surface Properties ◽  
Influencing Factors ◽  
Contaminated Soil ◽  
Environmental Conditions ◽  
Soil Microorganisms ◽  
Functional Material ◽  
Soil Components

Biochar is receiving increasing attention as a promising functional material in contaminated soil remediation. However, aging processes of biochar can usually take place and affect its remediation function, because surface properties of biochar are expected to change through a variety of biotic and abiotic processes. In this review, some important influencing factors of biochar aging processes were discussed, including temperature, and soil-physical, soil-chemical and soil-biological components. It pointed out that biochar aging processes may be promoted by high temperature, protected by soil components, particularly soil organic matter (SOM), and interactions with soil microorganisms. To further prolong application of biochar in nature, biochar aging can be mitigated by its influencing factors.

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