Product distribution and sulfur behavior in sewage sludge pyrolysis: Synergistic effect of Fenton peroxidation and CaO conditioning

Liu, Huan; Qiang, Zhang; Xing, Haoxuan; Hu, Hongyun; Li, Aijun; Yao, Hong

doi:10.1016/j.fuel.2015.06.067

Cited by 39 publications

(5 citation statements)

References 33 publications

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“…This reaction was confirmed by the decrease in thiophene sulfur representing sulfur bridges (–S–) and the increase in sulfones sulfur during the molten salt destruction of resins. 20,57 The increase in sulfones sulfur at 720 °C indicated that sulfones sulfur formed by the oxidation of thiophene sulfur was more than that consumed by reduction.…”

Section: Resultsmentioning

confidence: 99%

Study on the transformation of organic sulfur in cationic exchange resins in a ternary Li₂CO₃–Na₂CO₃–K₂CO₃ molten salt system

Xue

Zhang

et al. 2023

New J. Chem.

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Section: Resultsmentioning

confidence: 99%

Study on the transformation of organic sulfur in cationic exchange resins in a ternary Li₂CO₃–Na₂CO₃–K₂CO₃ molten salt system

Xue

Zhang

et al. 2023

New J. Chem.

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“…In N-containing groups, NO x can be easily produced from HNCO, HCN, and NH 3 through combustion, and these are important precursors of NO x forming photochemical smog . In S-containing groups, H 2 S and SO 2 can be converted into SO x , which form photochemical smog and acid rain pollution during the combustion process of syngas . Therefore, in this study, the C-, N-, and S-containing gaseous groups in the syngas from the pyrolysis of raw and anaerobically digested organic wastes were investigated to understand their resource and pollutant properties in depth.…”

Section: Introductionmentioning

confidence: 99%

Differential Effect of Anaerobic Digestion on Gaseous Products from Sequential Pyrolysis of Three Organic Solid Wastes

Zou

Song

et al. 2021

ACS Omega

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Studies have shown that anaerobic digestion (AD) has an effect on the liquid and solid product property of sequential pyrolysis, but its influence on the gaseous products is lacking. In this study, syngas produced by pyrolysis from three raw organic solid wastes and the corresponding digestates, i.e., food waste, vinasse, and cow manure were investigated. AD causes a decrease in the contents of volatile solid, fixed carbon, C, H, and N and an increase in the S content. The weight loss of the wastes mainly occurs at 200–550 °C during the pyrolysis and the loss of the food waste and vinasse is higher than that of cow manure. In the carbon (C)-containing gas, AD leads to a decrease in the CH 4 content of the syngas, implying that the heat values of the digestates are lower than that of the raw substrates. After AD, the total amount of nitrogen (N)-containing gas from the vinasse increases by 40.1%, while that from cow manure decreases by 14.1%. On the contrary, the total amount of sulfur (S)-containing groups in the syngas from vinasse drop by 22.0%, while that from cow manure increases by 9.1%. In addition, slight changes in the C-, N-, and S-containing gases are found from food waste. The results indicate that AD has a different effect on the N- and S- containing gaseous groups from different organic solid wastes, and the mechanisms deserve further investigation. The findings supply a theoretical foundation for environmental-friendly application of syngas from the digestates.

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“…During the pyrolysis process of sewage sludge, nitrogen- or sulfur-containing pollutants, mainly HCN, NH 3 , and H 2 S, will be formed as the pyrolysis temperature rises. ,− These pollutants will be introduced into the derived products (char, gas, and bio-oil) and, subsequently, result in the degradation of product quality. , Thus, the control of pollutants in the process of sludge pyrolysis has been widely concerned by researchers. ,, Calcium-based compounds, such as calcium hydroxide (Ca(OH) 2 ) and calcium oxide (CaO), have been demonstrated to be satisfactory candidates to capture the aforementioned pollutants during sludge pyrolysis. When sludge was pyrolyzed after a blend with calcium-based additives, nitrogen (N) within the sludge was preferably transformed from tar-N to gas-N. Gas-N existed mainly in the form of N 2 , whereas tar-N was in the form of amine, nitrile, and heterocyclic hydrocarbons .…”

Section: Introductionmentioning

confidence: 99%

“…2,11 Thus, the control of pollutants in the process of sludge pyrolysis has been widely concerned by researchers. 4,7,8 Calcium-based compounds, such as calcium hydroxide (Ca(OH) 2 ) and calcium oxide (CaO), have been demonstrated to be satisfactory candidates to capture the aforementioned pollutants during sludge pyrolysis. When sludge was pyrolyzed after a blend with calcium-based additives, nitrogen (N) within the sludge was preferably transformed from tar-N to gas-N. Gas-N existed mainly in the form of N 2 , whereas tar-N was in the form of amine, nitrile, and heterocyclic hydrocarbons.…”

Section: Introductionmentioning

confidence: 99%

Effect of Calcium Hydroxide on the Pyrolysis Behavior of Sewage Sludge: Reaction Characteristics and Kinetics

et al. 2017

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The effect of calcium hydroxide (Ca(OH) 2 ), a promising additive to control the pollutants released during sludge pyrolysis, on the pyrolysis behavior and kinetics of sewage sludge was investigated in detail in this study. The obtained thermograms of Ca(OH) 2 -blended sludge showed that the addition of Ca(OH) 2 influenced the thermogravimetric characteristics of sludge, especially in the temperature range of 340−700 °C where the decomposition of Ca(OH) 2 happens. An increasing addition of Ca(OH) 2 improved the pyrolysis conversion of sludge at temperatures of more than 600 °C, which was verified by the increase of the process heat flow. Importantly, the transformation of elements in sludge was promoted, resulting in a lesser content of impurities, which existed mostly in the thermally stable forms, in the remaining char. Kinetic analysis revealed that the pyrolysis behavior of sludge was influenced by the addition of Ca(OH) 2 and reaction temperature. At low temperatures, Ca(OH) 2 acted as the source of nuclei required for the establishment of reaction interface and then induced the secondary cracking of the pyrolytic compounds in the sludge matrix when the reaction came to high temperatures. A retrofitted kinetic model, overcoming the drawback faced by most Arrhenius-derived models that the integral of temperature-induced item was resolved by approximation, is developed and exhibits superiority in describing the reaction characteristics of sludge pyrolysis.

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Product distribution and sulfur behavior in sewage sludge pyrolysis: Synergistic effect of Fenton peroxidation and CaO conditioning

Cited by 39 publications

References 33 publications

Study on the transformation of organic sulfur in cationic exchange resins in a ternary Li₂CO₃–Na₂CO₃–K₂CO₃ molten salt system

Study on the transformation of organic sulfur in cationic exchange resins in a ternary Li₂CO₃–Na₂CO₃–K₂CO₃ molten salt system

Differential Effect of Anaerobic Digestion on Gaseous Products from Sequential Pyrolysis of Three Organic Solid Wastes

Effect of Calcium Hydroxide on the Pyrolysis Behavior of Sewage Sludge: Reaction Characteristics and Kinetics

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Product distribution and sulfur behavior in sewage sludge pyrolysis: Synergistic effect of Fenton peroxidation and CaO conditioning

Cited by 39 publications

References 33 publications

Study on the transformation of organic sulfur in cationic exchange resins in a ternary Li2CO3–Na2CO3–K2CO3 molten salt system

Study on the transformation of organic sulfur in cationic exchange resins in a ternary Li2CO3–Na2CO3–K2CO3 molten salt system

Differential Effect of Anaerobic Digestion on Gaseous Products from Sequential Pyrolysis of Three Organic Solid Wastes

Effect of Calcium Hydroxide on the Pyrolysis Behavior of Sewage Sludge: Reaction Characteristics and Kinetics

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Study on the transformation of organic sulfur in cationic exchange resins in a ternary Li₂CO₃–Na₂CO₃–K₂CO₃ molten salt system

Study on the transformation of organic sulfur in cationic exchange resins in a ternary Li₂CO₃–Na₂CO₃–K₂CO₃ molten salt system