WAS Pretreatment to Boost Volatile Solids Reduction and Digester Gas Production – Market and Technology Assessment

Long, Jianyou; Bullard, C. Michael

doi:10.2175/193864712811741421

Cited by 5 publications

(6 citation statements)

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“…In this light, the researchers noted that for a sludge inlet flow rate of about 380 m 3 /day, the annual economic benefit generated by full-ED pretreatment was estimated to be nearly $540,000 net of maintenance and operating expenses. Corresponding economic benefits due to incremental changes in SCOD, biogas production and reduction of biosolids, have also been reported in another full-scale installation of OpenCel™ [115]. A commercial electro-kinetic disintegration device with multiple full-scale installations in both Europe and US is BioCrack.…”

Section: Electro-kinetic Disintegration For Sludge Pretreatmentmentioning

confidence: 70%

A Comprehensive Review on Pretreatment Methods for Enhanced Biogas Production from Sewage Sludge

et al. 2022

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The treatment of municipal wastewater is considered a cornerstone for the protection of public health and environment. However, a major issue derived from this process is the large quantities of produced sewage sludge. Although anaerobic digestion is a widely applied method in Wastewater Treatment Plants (WWTPs) aiming to stabilize the sludge and to recover energy in the form of methane, it is usually limited due to the reduced decomposition efficiency and slow biodegradation rate of this recalcitrant substrate. For this reason, various pretreatment methods have been proposed aiming to modify the sludge structure, solubilize the organic matter, and decrease the crystallinity of sludge so as to accelerate hydrolysis and consequently enhance methane production. The current research is a comprehensive collection of recent advances in pretreatment technologies that can be potentially applied in wastewater treatment facilities. The critical review analysis presented herein reveals the several advantages and drawbacks, as well as the technical opportunities of the pretreatment methods and provides an assessment of their feasibility/applicability from an energetic, environmental, and economic point of view.

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Section: Electro-kinetic Disintegration For Sludge Pretreatmentmentioning

confidence: 70%

A Comprehensive Review on Pretreatment Methods for Enhanced Biogas Production from Sewage Sludge

et al. 2022

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“…73,74 In addition to unique magnetic properties, SPIONs are excellent absorbers of MW radiation through the process of ferromagnetic resonance, which is dissipated as thermal energy to the surrounding matrix with high efficiency. 35 These properties are also strongly dependent on particle size and atomic order (<25 nm), as others have reported. 75 Further, to achieve successful environmental, aqueous-based applications, SPION synthesis should ensure particle stability and dispersity over a range of dynamic heating conditions and specific surface functionality.…”

Section: Spion Synthesis Key Properties and Main Barriers In Front Of...mentioning

confidence: 99%

“…In recent years, several sludge prehydrolysis methods have been developed and integrated into full-scale WWTPs in the U.S. and around the world, including thermal, ultrasonic, and electrocatalytic approaches. ,− Some of these full-scale applications are in regions that have a large capacity of anaerobic digestion, but some regions may benefit from enhanced prehydrolysis of anaerobically digested sludge (Figure ). In principle, sludge prehydrolysis aims at enhancing organic matter (bio)availability by breaking cell walls and disrupting sludge floc assemblies; however, chemical complexity of the sludge matrix and abundance of water limit the selectivity and energy efficiency of pretreatment processes.…”

Section: Overview Of Spion-augmented Microwave-based Sludge Prehydrol...mentioning

confidence: 99%

“…SPIONs are ferromagnetic nanomaterials, which are often iron oxide based (e.g., Fe 3 O 4 , magnetite or γ-Fe 2 O 3 , maghemite) . Superparamagnetism is observed when the size of the ferromagnetic single domain crystal is small enough that, when below the Curie temperature, there is no net material magnetism unless a magnetic field is directly applied, whereby the material then behaves in a paramagnetic fashion and the magnetic moment of the entire crystal aligns. , In other words, SPIONs have zero magnetization in the absence of an external magnetic field (i.e., not magnetically aggregated with each other) but maintain large magnetic susceptibility when a field is toggled “on”, which allows for SPION physical control and thus separation. , In addition to unique magnetic properties, SPIONs are excellent absorbers of MW radiation through the process of ferromagnetic resonance, which is dissipated as thermal energy to the surrounding matrix with high efficiency . These properties are also strongly dependent on particle size and atomic order (<25 nm), as others have reported .…”

Section: Spion Synthesis Key Properties and Main Barriers In Front Of...mentioning

confidence: 99%

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Superparamagnetic Iron Oxide Nanoparticles as Additives for Microwave-Based Sludge Prehydrolysis: A Perspective

Hatinoglu,

Lee,

Fortner

et al. 2023

Environ. Sci. Technol.

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Wastewater treatment plants are critical for environmental pollution control. The role that they play in protecting the environment and public health is unquestionable; however, they produce massive quantities of excess sludge as a byproduct. One pragmatic approach to utilizing excess sludge is generating methane via anaerobic digestion. For this, a prehydrolysis step can significantly improve digestion by increasing biogas quality and quantity while decreasing final sludge volumes. One of the many prehydrolysis approaches is to deliver heat into sludge via microwave irradiation. Microwave-absorbing additives can be used to further enhance thermal degradation processes. However, the implications of such an approach include potential release of said additive materials into the environment via digested sludge. In this perspective, we present and discuss the potential of superparamagnetic iron oxide nanoparticles (SPIONs) as recoverable, hyperreactive microwave absorbers for sludge prehydrolysis. Due to their size and characteristics, SPIONs pack spin electrons within a single domain that can respond to the magnetic field without remanence magnetism. SPIONs have properties of both paramagnetic and ferromagnetic materials with little to no magnetic hysteresis, which can enable their rapid recovery from slurries, even in complicated reactor installations. Further, SPIONs are excellent microwave absorbers, which result in high local heat gradients. This perspective introduces the vision that SPION properties can be tuned for desirable dielectric heating and magnetic responses while maintaining material integrity to accomplish repeated use for microwave-enhanced pretreatment.

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“…Meanwhile, the ultimate yield increased by 1.32 L/g COD (ozone), 1.1 4 L/g COD (ultrasonication), and 0.86 L/g COD (control). Both O 3 and ultrasound pretreatment are employed in real scale and have obtained the achievement of increasing biogas yield by around 35%, sludge discharge, and dewater reduction [36].…”

Section: Cumulative Biogas Production From Anaerobic Digestion Of Digmentioning

confidence: 99%

Effect of Assisted Ultrasonication and Ozone Pretreatments on Sludge Characteristics and Yield of Biogas Production

Anh

et al. 2019

Processes

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The effects of ultrasonic and ozonation pretreatments on organic solubilization, anaerobic biodegradability, and biogas production were elucidated in this study. Two pretreatment methods for batch anaerobic digestion for biogas recovery with the same material and experimental conditions were the focus for comparison. Anaerobic digestion experiments were conducted at ambient temperature with the solid retention time set to 25 days. The obtained results indicated that the soluble chemical oxygen demand increased from 0.344 without pretreatment to 1.023 and 1.228 g/L with ultrasound and ozone pretreatments, respectively, whereas the yields of biogas production in the 25 days increased by 32.3 and 52.9% via ultrasonic irradiation and ozonation relative to the control case, respectively. The biodegradability of the organic compounds of the samples for the cases of ultrasound, ozone pretreatments, and control achieved 55.9, 64.31, and 39.18%, respectively, in terms of chemical oxygen demand (COD) removal efficiencies. The physicochemical characteristics of sludge flocs were investigated via scanning with particle sizes, which were obviously affected by pretreatments of sonication and ozonation, resulting in finer particles than in the control case.

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WAS Pretreatment to Boost Volatile Solids Reduction and Digester Gas Production – Market and Technology Assessment

Cited by 5 publications

References 0 publications

A Comprehensive Review on Pretreatment Methods for Enhanced Biogas Production from Sewage Sludge

A Comprehensive Review on Pretreatment Methods for Enhanced Biogas Production from Sewage Sludge

Superparamagnetic Iron Oxide Nanoparticles as Additives for Microwave-Based Sludge Prehydrolysis: A Perspective

Effect of Assisted Ultrasonication and Ozone Pretreatments on Sludge Characteristics and Yield of Biogas Production

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