Ultrasound Applications in Wastewater Sludge Pretreatment: A Review

Khanal, Samir Kumar; Grewell, David; Sung, Shihwu; Leeuwen, J. van

doi:10.1080/10643380600860249

Cited by 311 publications

(160 citation statements)

References 35 publications

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“…It has been reported that hydrolysis is the rate-limiting step in anaerobic digestion [3,4]. Extracellular polymeric substances (EPS) and microbial cells are recalcitrant to direct hydrolysis, and therefore, the pretreatment of sludge is required to rupture the cell walls, to facilitate the release of intracellular material into the aqueous phase and accelerate the low rate of biodegradation, and to enhance anaerobic digestion [5].…”

Section: Introductionmentioning

confidence: 99%

Effect of Ultrasound Pretreatment on Sludge Digestion and Dewatering Characteristics: Application of Particle Size Analysis

Martínez

Rosas

Morán

et al. 2015

Water

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Abstract:The aim of this work was to study the effect of ultrasonic pretreatment on sludge digestion, particle size distribution (PSD), and dewaterability of digestates (measured by capillary suction time (CST) and specific resistance to filtration (SRF)). Sludge was pretreated with ultrasound (24 kHz) at an energy dosage of 4300 kJ/kg TS. Digestibility of sludge was increased by ultrasound pretreatment resulting in a higher specific methane production (SMP). The digestate of pretreated waste activated sludge (WAS) obtained under batch conditions presented a better dewatering performance. Digestion under semi-continuous conditions was evaluated using sewage sludge (mixture of primary sludge and WAS). In this case, digestates presented a much higher mean particle size for both cases evaluated (pretreated and non-pretreated) than that obtained under batch conditions. A wide PSD was a characteristic of these digestate samples. Flow dynamics inside the reactor resulted in the presence of high-diameter flocs, thus significantly affecting the mean particle size and specific surface area (SSA) values.

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Section: Introductionmentioning

confidence: 99%

Effect of Ultrasound Pretreatment on Sludge Digestion and Dewatering Characteristics: Application of Particle Size Analysis

Martínez

Rosas

Morán

et al. 2015

Water

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“…Nowadays, new different approaches using transducers can be found in literature, such as the high power stepped-plate ultrasonic transducer [18] and the parallelplate near field sonoreactor working at two different frequencies and with the possibility for working at different power densities and ultrasonic intensities [19]. In addition, the full scale method has been developed for some interesting applications in environmental concerns such as sludge treatment [20,21,22] with some equipment commercially available [23]. In the development of all of these devices, two main targets must be addressed: (i) optimization of the energetic efficiency and (ii) maximization of the effective volume.…”

Section: Experimental Devices and Methodologymentioning

confidence: 99%

Sonochemical Treatment of Water Polluted by Chlorinated Organocompounds. A Review

González-Garcı́a

Sáez

Tudela

et al. 2010

Water

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As one of several types of pollutants in water, chlorinated compounds have been routinely subjected to sonochemical analysis to check the environmental applications of this technology. In this review, an extensive study of the influence of the initial concentration, ultrasonic intensity and frequency on the kinetics, degradation efficiency and mechanism has been analyzed. The sonochemical degradation follows a radical mechanism which yields a very wide range of chlorinated compounds in very low concentrations. Special attention has been paid to the mass balance comparing the results from several analytical techniques. As a conclusion, sonochemical degradation alone is not an efficient treatment to reduce the organic pollutant level in waste water.

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“…Several recent studies have been conducted to address organic waste-to-energy and to address the food waste problem in the U.S. [11][12][13][14][15]. From a technical standpoint, to speed up the hydrolysis process, the sonication of food waste has been explored recently [16][17][18][19] in addition to the thermal treatment of food waste [20][21][22][23][24]. These studies primarily focus on the chemical processes and "proof of concept" analyses, but do not fully explore the techno-economic nor environmental impacts of utilizing these technologies related specifically to food waste at local or region-specific levels, nor do they incentivize reduction from an economic standpoint.…”

Section: Literature Review Summarymentioning

confidence: 99%

Development of a Novel Food Waste Collection Kiosk and Waste-to-Energy Business Model

Franchetti

2016

Resources

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The U.S. generates more than 37 million metric tons of food waste each year, and over 95% of it is disposed of at U.S. landfills. This paper describes the development of a novel food waste collection kiosk and business model called "Greenbox" that will collect and store food waste from households and restaurants with incentives for user participation to spur food waste-to-energy production in a local community. Greenbox offers a low-cost collection point to divert food waste from landfills, reduce greenhouse gases from decomposition, and aid in generating cleaner energy. A functional prototype was successfully developed by a team of engineering students and a business model was created as part of a senior design capstone course. Each Greenbox unit has the potential to reduce 275 metric tons of food waste per year, remove 1320 kg of greenhouse gases, and create 470,000 liters of methane gas while providing a payback period of 4.2 years and a rate of return of 14.9%.

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Ultrasound Applications in Wastewater Sludge Pretreatment: A Review

Cited by 311 publications

References 35 publications

Effect of Ultrasound Pretreatment on Sludge Digestion and Dewatering Characteristics: Application of Particle Size Analysis

Effect of Ultrasound Pretreatment on Sludge Digestion and Dewatering Characteristics: Application of Particle Size Analysis

Sonochemical Treatment of Water Polluted by Chlorinated Organocompounds. A Review

Development of a Novel Food Waste Collection Kiosk and Waste-to-Energy Business Model

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