Radiocaesium contaminated sites and possible techniques for remediation

Khan, Aysha Masood; Noor, Mehwish Jamil

doi:10.1080/24749508.2017.1332849

Cited by 7 publications

(3 citation statements)

References 41 publications

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“…[ 275 ] Many conventional techniques have been used to address radionuclide contamination, such as chemical precipitation and flocculation or membrane exchange. [ 276 ] These methods, however, are not cost‐effective. Biologically mediated mineralization appears to be a better alternative for removing these pollutants.…”

Section: Applicationsmentioning

confidence: 99%

Microbe‐Mediated Extracellular and Intracellular Mineralization: Environmental, Industrial, and Biotechnological Applications

et al. 2020

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Bacteria play an important role in the calcification process of natural minerals and within organisms ( Table 1). It is Microbe-mediated mineralization is ubiquitous in nature, involving bacteria, fungi, viruses, and algae. These mineralization processes comprise calcification, silicification, and iron mineralization. The mechanisms for mineral formation include extracellular and intracellular biomineralization. The mineral precipitating capability of microbes is often harnessed for green synthesis of metal nanoparticles, which are relatively less toxic compared with those synthesized through physical or chemical methods. Microbe-mediated mineralization has important applications ranging from pollutant removal and nonreactive carriers, to other industrial and biomedical applications. Herein, the different types of microbe-mediated biomineralization that occur in nature, their mechanisms, as well as their applications are elucidated to create a backdrop for future research.

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Section: Applicationsmentioning

confidence: 99%

Microbe‐Mediated Extracellular and Intracellular Mineralization: Environmental, Industrial, and Biotechnological Applications

et al. 2020

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“…indicating that the soil moisture in the fixed dune is most affected by its value of nearly 10 days (Khan et al, 2017). The autocorrelation of soil moisture is smaller in the 40-100 cm layer, and larger in the 0-40 cm and 100-120 cm layers, indicating that the soil moisture in the 40-100 cm layer is greatly affected by external environment.…”

Section: Autocorrelation Analysis Of Time Seriesmentioning

confidence: 96%

Application of Time Series Analysis in Soil Moisture of Fixed Dune on Korqin Sandy Land, Northern China

2020

Global NEST: The International Journal

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<p>Time series analysis is a very effective method to analyze the dynamic characteristics of soil moisture at long-term scale. In this study, we have used the time series to analyze the relationship between precipitation and soil moisture on fixed dune at different soil depths (from 0 to 120 cm) during the growing season (from May to September) of 2006-2010 in Korqin Sandy Land, northern China. The results indicate that: (1) The precipitation is a relatively independent time series and has no obvious autocorrelation. Precipitation in an earlier stage has no obvious effect on the later stage in the growing season. (2) Soil moisture in different soil layers has higher autocorrelation; and the autocorrelation of soil moisture in each soil layer is significantly weakened with the increase in time lag interval. (3) The correlation coefficient between soil moisture and precipitation in each soil layer is higher at the time lag interval of k = 0; with the increase in soil depth, the correlation is gradually weakened. (4) The maximum correlation coefficients of soil moisture series and precipitation series in different soil depths were obtained at the time lag interval of k = 0.</p>

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“…Dahlsveen et al (2001) conducted a process for liquefied natural gas injection. With changing composition of liquefied natural gas, experiments showed a much thicker vapor blanket and larger jet spreading angle (Dahlsveen et al, 2001; Khan and Noor, 2017)). Wen et al (2006) conducted a series experiment of liquid nitrogen injection into water.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on Cryogen Injection Into Water

Zhang¹

2017

Appl. Ecol. Env. Res.

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Abstract. Explosive boiling is a hyperactive boiling phenomenon, which is characterized by transient high heat flux. There are still few researches on the experimental comparative analysis on explosive boiling inducing by different cryogen liquid injection into water. In this paper, to advance our understanding of LNG (Liquefied Natural Gas), LN 2 (Liquefied Nitrogen) and LC 3 H 8 (Liquefied Propane) injection into water process, a visualization experimental system is built. Visualized results show that LNG and LN 2 injection processes undergo a similar boiling, that is explosive boiling, which is characterized by bubbles cloud that strengthens heat transfer rate. LC 3 H 8 injection into water triggers subcooled flow boiling. There is no significant breaking on the liquid cryogen column and without bubbles cloud. The maximum heat transferring flux can be over 1.9 MW/m 2 in the condition of LNG injection into unconfined water and under the pressure of 7 bars. In order to investigate the determinant factors for explosive boiling occurring, instability of Rayleigh-Taylor, Kelvin-Helmholtz, Weber number and Marangoni convection are analyzed and used to explain the differences of maximum pressure and its occurring time in different experimental conditions such as injection depth into water, injection pressure, water temperature and injecting fluid. As a result, it is reasonable to conclude that if the relative velocity between cryogen and surrounding fluid is high enough, the breaking of liquid column or droplets will be defined by the Kelvin-Helmholtz instability and Weber number. And in subcooling mixture or pure substance injection process, the periphery of the vapor film near the head of column is considerably stronger than other regions in the effect of Marangoni convection at the beginning of column floating upwards or the ending of column going downwards. All of these can be seen as the key factors to improve heat transfer capacity and trigger explosive boiling.

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Radiocaesium contaminated sites and possible techniques for remediation

Cited by 7 publications

References 41 publications

Microbe‐Mediated Extracellular and Intracellular Mineralization: Environmental, Industrial, and Biotechnological Applications

Microbe‐Mediated Extracellular and Intracellular Mineralization: Environmental, Industrial, and Biotechnological Applications

Application of Time Series Analysis in Soil Moisture of Fixed Dune on Korqin Sandy Land, Northern China

Experimental Study on Cryogen Injection Into Water

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