Recent studies in environmental applications of ultrasound

Pham, Thuy Duong; Shrestha, Reena Amatya; Virkutytė, Jūratė

doi:10.1680/jees.2013.0040

Cited by 14 publications

(7 citation statements)

References 62 publications

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“…Sonication prevents microbial biofilms (Wang et al 2017 ) and can increase the rate of bacterial cell growth (Pitt and Ross, 2003 ). Ultrasonication is already used in soil and sediment remediation (Radu et al 2020 ) and could serve as an environmentally friendly (no toxic chemicals are used or produced), low cost, and compact (allowing on-site treatment) solution to improve the spreading of inoculated bacteria across the host matrix (Pham et al 2009 ).…”

Section: Discussionmentioning

confidence: 99%

Controlling pore-scale processes to tame subsurface biomineralization

Jiménez‐Martínez

Nguyen

2022

Rev Environ Sci Biotechnol

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Microorganisms capable of biomineralization can catalyze mineral precipitation by modifying local physical and chemical conditions. In porous media, such as soil and rock, these microorganisms live and function in highly heterogeneous physical, chemical and ecological microenvironments, with strong local gradients created by both microbial activity and the pore-scale structure of the subsurface. Here, we focus on extracellular bacterial biomineralization, which is sensitive to external heterogeneity, and review the pore-scale processes controlling microbial biomineralization in natural and engineered porous media. We discuss how individual physical, chemical and ecological factors integrate to affect the spatial and temporal control of biomineralization, and how each of these factors contributes to a quantitative understanding of biomineralization in porous media. We find that an improved understanding of microbial behavior in heterogeneous microenvironments would promote understanding of natural systems and output in diverse technological applications, including improved representation and control of fluid mixing from pore to field scales. We suggest a range of directions by which future work can build from existing tools to advance each of these areas to improve understanding and predictability of biomineralization science and technology.

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Section: Discussionmentioning

confidence: 99%

Controlling pore-scale processes to tame subsurface biomineralization

Jiménez‐Martínez

Nguyen

2022

Rev Environ Sci Biotechnol

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“…Ultrasonic irradiation is a powerful way to degrade a variety of pollutants and toxic chemicals [1][2][3]. Demonstrated examples for ultrasonic removal in aqueous media include fuel oxygenates [4], a variety of chlorinated compounds [5], series of phenols [6,7], arsenic species [8], polycyclicaromatic compounds [9], textile dyes [10,11], and surfactants [12].…”

Section: Examples Of Environmental Applicationmentioning

confidence: 99%

Environmental Application of Ultrasonic Irradiation

Kim¹

2018

IJESNR

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The ultrasound waves (20kHz to several hundred kHz) generated from the conversion of electric pulses by using a transducer can cause dramatic chemical and physical effects. Cavitating bubbles formed under ultrasonic irradiation produce high temperature and pressure conditions (up to 5,000K and 1,000 atm) inside the bubbles and as a consequence reactive oxygen species and many other reactive radicals are produced. The ultrasonic irradiation technique for cleaning polluted water has several merits over the other typical advanced oxidation technologies (AOTs) because this technique does not require chemical additives or catalystsand is independent of the color of the polluted water.

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“…Tiehm et al (2001) and Zhang et al (2008a) found that DD COD decreased owing to the increase in frequency (41-1068 kHz and 25-150 kHz, respectively), indicating that mechanical effects, instead of free radicals, are responsible for the biodegradability enhancement. It is therefore important to note that in most works sludge disintegration is the most significant at low frequencies (Pham et al, 2009;Carrère et al, 2010;Pilli et al, 2011). However, the lowest investigated values of frequency in this field have been restricted to around 20-25 kHz.…”

Section: Ultrasonic Frequencymentioning

confidence: 99%

An executive review of sludge pretreatment by sonication

Julcour-Lebigue

Delmas

2015

Journal of Environmental Sciences

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Ultrasonication (US), which creates hydro-mechanical shear forces in cavitation, is an advanced technology in sludge pretreatment. However, there are many factors affecting the efficacy of cavitation and ultrasonication disintegration of sludge as a consequence. The objective of this work is to present an extensive review of evaluation approaches of sludge US pretreatment efficiency. Besides, optimization methodologies of related parameters, the differences of optimum values and the similarities of affecting trends on cavitation and sludge pretreatment efficiency were specifically pointed out, including ambient conditions, ultrasonic properties, and sludge characteristics. The research is a prerequisite for optimization of sludge US pretreatment efficiency in lab-scale and practical application. There is not-yet a comprehensive method to evaluate the efficiency of sludge US pretreatment, but some main parameters commonly used for this purpose are degree of sludge disintegration, proteins, particle size reduction, etc. Regarding US parameters, power input PUS, intensity IUS, and frequency FS seem to have significant effects. However, the magnitude of the effect of PUS and probe size in terms of IUS has not been clearly detailed. Investigating very low FS seems interesting but has not yet been taken into consideration. In addition, static pressure effect has been marginally studied only and investigation on the effect of pH prior to US process has been restricted. Their effects therefore should be varied separately and simultaneously with other related parameters, i.e. process conditions, ultrasonic properties, and sludge characteristics, to optimize sludge US pretreatment process.

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Recent studies in environmental applications of ultrasound

Cited by 14 publications

References 62 publications

Controlling pore-scale processes to tame subsurface biomineralization

Controlling pore-scale processes to tame subsurface biomineralization

Environmental Application of Ultrasonic Irradiation

An executive review of sludge pretreatment by sonication

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