Temperature influence on product distribution and characteristics of derived residue and oil in wet sludge pyrolysis using microwave heating

Lin, Kun-You; Lai, Nina; Zeng, Jun-Yan; Chiang, Hung‐Lung

doi:10.1016/j.scitotenv.2017.01.195

Cited by 33 publications

(12 citation statements)

References 37 publications

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“…The microwave oven could be operated with a maximum input power of 900 W at a frequency of 2450 MHz. The microwave heating pyrolysis system and products collection system were designed as shown in our previous report . The tubular reactor (25 cm in length, with a 5.5 cm inner diameter and a 9 cm outer diameter) and its container were both made of quartz.…”

Section: Methodsmentioning

confidence: 99%

“…The microwave heating pyrolysis system and products collection system were designed as shown in our previous report. 13 The tubular reactor (25 cm in length, with a 5.5 cm inner diameter and a 9 cm outer diameter) and its container were both made of quartz. The reactor was sealed using a rubber-silicon-ring and a stainless steel cap (1 cm thick, 9 cm outer diameter).…”

Section: Microwave Processesmentioning

confidence: 99%

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Microwave pyrolysis of sludge for potential use as land application and biofuel

Lin

Zeng

Chiang

2019

J of Chemical Tech & Biotech

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BACKGROUND A microwave pyrolysis was conducted to treat two sludge cakes for the production of liquid oil and sludge residues. The application of pyrolysis technology, the safety of land disposal of pyrolysis residue, and the quality of the derived biofuel were evaluated. RESULTS Results indicated that the total pore volume increased with increases in the mesopore size range in the case of both sludge residues after increasing the pyrolysis temperature. Low carbon, hydrogen, and sulfur content and high nitrogen content were observed in the oil derived from the chemical industry sludge. As a result, the pyrolysis liquid chemical sludge oils had heat values of 9600 to 9700 kcal kg−1 at 673–1073 K, which was slightly lower than the 9800–10 000 kcal kg−1 found for the petrochemical sludge. CONCLUSION After pyrolysis, the amount of 16 polyaromatic hydrocarbons (PAHs) in the residue and oil were significantly reduced in both the chemical sludge and petrochemical sludge at 673–1073 K. The high pyrolysis liquid oil heat values for both types of sludge indicated their potential for use as a biofuel to produce energy. The 16 PAH content in the pyrolysis residues was higher than the European standard of 6 mg kg−1, and they were thus not acceptable for soil and agricultural applications. However, as reported in the literature, using a pyrolysis temperature above 1073 K may further reduce the PAH content of the pyrolysis residue to meet regulatory standards. © 2019 Society of Chemical Industry

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Section: Methodsmentioning

confidence: 99%

Section: Microwave Processesmentioning

confidence: 99%

Microwave pyrolysis of sludge for potential use as land application and biofuel

Lin

Zeng

Chiang

2019

J of Chemical Tech & Biotech

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“…The potential for wet sludge usage directly in thermal reactors, makes microwave technologies highly attractive, however scaling up the technology is still a challenge. As a result, the use of various heating rates, catalysts and reaction temperatures on sewage sludge has been adopted for maximizing liquid products as investigated by various researchers [95][96][97]. Recent studies utilised various reactor types (e.g., batch, continuous, microwave, fluidized bed and horizontal furnace), operating conditions (e.g., temperature, time, power and catalyst) and fuel (e.g., primary, digested, wet sludge and blends) for optimising pyrolytic product distribution and their quality as seen in Table 4 which summarises results from past studies.…”

Section: Pyrolysismentioning

confidence: 99%

“…Recent studies utilised various reactor types (e.g., batch, continuous, microwave, fluidized bed and horizontal furnace), operating conditions (e.g., temperature, time, power and catalyst) and fuel (e.g., primary, digested, wet sludge and blends) for optimising pyrolytic product distribution and their quality as seen in Table 4 which summarises results from past studies. The bio-oil yield from sewage sludge pyrolysis ranges from 14-57.5 wt% [95][96][97][98][99][100][101][102][103][104][105]. Pokorna et al [105] reported a maximum bio-oil yield of 57.5 wt% with water content as low as 10 wt% when flash pyrolysis was conducted at 500 • C in a lab-scale semi-continuous reactor.…”

Section: Pyrolysismentioning

confidence: 99%

“…However, these studies have also observed improvement in quality of the pyrolytic products with catalyst. The pyrolysis of wet sludge (>84 wt% moisture) was studied using a 900 W microwave reactor at 2.4 GHz with maximum bio-oil yield of 20% after 30 min processing at 600 • C [95]. The potential for wet sludge usage directly in thermal reactors, makes microwave technologies highly attractive, however scaling up the technology is still a challenge.…”

Section: Pyrolysismentioning

confidence: 99%

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A Review of Sludge-to-Energy Recovery Methods

et al. 2018

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The increasing volume of sewage sludge from wastewater treatment facilities is becoming a prominent concern globally. The disposal of this sludge is particularly challenging and poses severe environmental hazards due to the high content of organic, toxic and heavy metal pollutants among its constituents. This study presents a simple review of four sewage to energy recovery routes (anaerobic digestion, combustion, pyrolysis and gasification) with emphasis on recent developments in research, as well as benefits and limitations of the technology for ensuring cost and environmentally viable sewage to energy pathway. This study focusses on the review of various commercially viable sludge conversion processes and technologies used for energy recovery from sewage sludge. This was done via in-depth process descriptions gathered from literatures and simplified schematic depiction of such energy recovery processes when utilised for sludge. Specifically, the impact of fuel properties and its effect on the recovery process were discussed to indicate the current challenges and recent scientific research undertaken to resolve these challenges and improve the operational, environmental and cost competitiveness of these technologies.

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Co-pyrolysis of sewage sludge and pinewood sawdust: the synergistic effect and bio-oil characteristics

Bai

et al. 2021

Biomass Conv. Bioref.

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Temperature influence on product distribution and characteristics of derived residue and oil in wet sludge pyrolysis using microwave heating

Cited by 33 publications

References 37 publications

Microwave pyrolysis of sludge for potential use as land application and biofuel

Microwave pyrolysis of sludge for potential use as land application and biofuel

A Review of Sludge-to-Energy Recovery Methods

Co-pyrolysis of sewage sludge and pinewood sawdust: the synergistic effect and bio-oil characteristics

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