The effects of catalysts on the conversion of organic matter and bio-fuel production in the microwave pyrolysis of sludge at different temperatures

Ma, Rui; Huang, Xiaofei; Zhou, Yang; Lin, Fang; Sun, Shichang; Zhang, Peixin; Zhang, Xianghua; Zhao, Xuxin

doi:10.1016/j.biortech.2017.04.103

Cited by 60 publications

(14 citation statements)

References 30 publications

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“…Fonts et al (2012) reported that minimum water content in the tar could be observed at temperatures between 400 and 550°C which was similar to the observations of the other studies (Alvarez et al, 2015a). In contrast, a recent study by Ma et al (2017) reported a continuous decrease in pyrolysis water yield from 4.2% at 500°C to 2.1% at 900°C during microwave pyrolysis of sewage sludge while an insignificant influence on the water yield by the pyrolysis temperature was reported in another study (Liu et al, 2018b). Steroids were predominant in the tar obtained at 450 and 550°C while at 650°C only few steroids were contained in the tar.…”

Section: Tar Characteristicssupporting

confidence: 81%

“…The yields of the tar and noncondensable gas are influenced by the pyrolysis temperature differently. For instance, Park et al (2010) pyrolyzed sewage sludge in a fluidized bed reactor and reported a decrease in tar yield with the increase in pyrolysis temperature from 400 to 550°C while in a microwave pyrolysis study, maximum tar yield was observed at 700°C and decreased at higher temperature (Ma et al, 2017). Similar discrepancies were also observed for non-condensable gas yields in these studies.…”

Section: Pyrolysis Productsmentioning

confidence: 51%

“…Aromatic content continued to increase with the increase in temperature while hydrocarbons concentration was peaked at 500°C (for biochemical sludge-derived tar) (Ma et al, 2017) Organic 500-900 Aliphatic hydrocarbon content was increased with increase in temperature. At 800°C, aromatic compounds concentration was peaked and O-containing aliphatic content minimised.…”

Section: Referencementioning

confidence: 97%

“…This can be ascribed to the extended decomposition of sewage sludge constituents at higher temperatures. However, the extent of decrease in char yield is influenced by sewage sludge properties and reactor configuration (Huang et al, 2014;Liu et al, 2018b;Ma et al, 2017;Zielińska et al, 2015). The yields of the tar and noncondensable gas are influenced by the pyrolysis temperature differently.…”

Section: Pyrolysis Productsmentioning

confidence: 99%

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Valorisation of sewage sludge through pyrolysis : product properties and immobilisation of heavy metals

Udayanga¹

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Section: Tar Characteristicssupporting

confidence: 81%

Section: Pyrolysis Productsmentioning

confidence: 51%

Section: Referencementioning

confidence: 97%

Section: Pyrolysis Productsmentioning

confidence: 99%

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Valorisation of sewage sludge through pyrolysis : product properties and immobilisation of heavy metals

Udayanga¹

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“…On the other hand, CuCl 2 and NaCl showed the opposite effects. Ma et al investigated the effects of catalysts on the conversion of organic matter in the microwave pyrolysis of sludge at different temperatures [113]. The results of this study showed that the catalytic gas-production capacities of CaO were higher than those of Fe 2 O 3 , and the bio-gas yield at 800 • C reached a maximum of 35.1%.…”

Section: Microwave-assisted Pyrolysis In-situ Upgradingmentioning

confidence: 85%

Microwaves and Heterogeneous Catalysis: A Review on Selected Catalytic Processes

et al. 2020

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Since the late 1980s, the scientific community has been attracted to microwave energy as an alternative method of heating, due to the advantages that this technology offers over conventional heating technologies. In fact, differently from these, the microwave heating mechanism is a volumetric process in which heat is generated within the material itself, and, consequently, it can be very rapid and selective. In this way, the microwave-susceptible material can absorb the energy embodied in the microwaves. Application of the microwave heating technique to a chemical process can lead to both a reduction in processing time as well as an increase in the production rate, which is obtained by enhancing the chemical reactions and results in energy saving. The synthesis and sintering of materials by means of microwave radiation has been used for more than 20 years, while, future challenges will be, among others, the development of processes that achieve lower greenhouse gas (e.g., CO 2 ) emissions and discover novel energy-saving catalyzed reactions. A natural choice in such efforts would be the combination of catalysis and microwave radiation. The main aim of this review is to give an overview of microwave applications in the heterogeneous catalysis, including the preparation of catalysts, as well as explore some selected microwave assisted catalytic reactions. The review is divided into three principal topics: (i) introduction to microwave chemistry and microwave materials processing; (ii) description of the loss mechanisms and microwave-specific effects in heterogeneous catalysis; and (iii) applications of microwaves in some selected chemical processes, including the preparation of heterogeneous catalysts.A chemical process is conventionally energized by means of conductive heating with a steam boiler as a typical heat source. Nevertheless, a large variety of other forms of energy can be applied for PI, including ultrasounds (for reactions or crystal nucleation), light (in photocatalytic processes), electric fields (in extraction or for orientation of molecules), or microwaves. The microwave (dielectric) heating of materials has been known for a long time, and microwave ovens have been developed from more than 60 years. The studies by Gedye et al. in 1986 and 1988 [3,4] opened a period of very intensive investigation of the microwave effects on chemical reactions in homogeneous systems. Since then, hundreds of research papers have been published, and research has also expanded toward heterogeneous catalysis and its related chemical processes. This review gives an overview of the application of microwave technology to heterogeneous catalysis, including various chemical processes, as well as to the preparation of catalysts.

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Microwave pretreatment of wastewater sludge technology—a scientometric-based review

Li,

Campos,

2024

Environ Sci Pollut Res

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This manuscript presents a scientometric review of recent advances in microwave pretreatment processes for sewage sludge, systematically identifying existing gaps and prospects. For this purpose, 1763 papers on the application of microwave technology to sludge pretreatment were retrieved from the Web of Science (WoS) using relevant keywords. These publications were then analyzed using diverse scientometric indices. The results show that research in this field encompasses applications based on the non-thermal effects of microwaves, enhanced effectiveness of anaerobic digestion (AD), and the energy balance of this pretreatment system. Overcoming existing technical challenges, such as the cleavage of extracellular polymers, reducing microwave energy consumption, understanding the non-thermal effects of microwaves, promoting AD of sludge in combination with other chemical and physical methods, and expanding the application of the technology, are the main scientific focuses. Additionally, this paper thoroughly examines both the constraints and potential of microwave pretreatment technology for wastewater treatment.

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The effects of catalysts on the conversion of organic matter and bio-fuel production in the microwave pyrolysis of sludge at different temperatures

Abstract: Sun, et al.. The effects of catalysts on the conversion of organic matter and bio-fuel production in the microwave pyrolysis of sludge at different temperatures. Bioresource Technology, Elsevier, 2017, 238, pp.616-623.

Cited by 60 publications

References 30 publications

Valorisation of sewage sludge through pyrolysis : product properties and immobilisation of heavy metals

Valorisation of sewage sludge through pyrolysis : product properties and immobilisation of heavy metals

Microwaves and Heterogeneous Catalysis: A Review on Selected Catalytic Processes

Microwave pretreatment of wastewater sludge technology—a scientometric-based review

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