Release of organic sulfur as sulfur-containing gases during low temperature pyrolysis of sewage sludge

Liu, Shuai; Wei, Mengmeng; Qiao, Yu; Yang, Zhenle; Gui, Ben; Yu, Yun; Xu, Minghou

doi:10.1016/j.proci.2014.06.055

Cited by 84 publications

(37 citation statements)

References 18 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…However, specific behaviors of these compounds are strongly dependent on the reactor arrangement and other operational parameters [5,7,12]. On the other hand, the content of nitrogen and sulfur containing species in the pyrolytic gas and condensate is only marginally described in the literature [4,15]. Moreover, light hydrocarbons are usually reported summarily as C 2 -C x or C x H y group [7,14,16] and more detailed analysis of their compound species is scarce.…”

Section: Introductionmentioning

confidence: 99%

Detailed Analysis of Sewage Sludge Pyrolysis Gas: Effect of Pyrolysis Temperature

et al. 2020

View full text Add to dashboard Cite

Conventional methods of sewage sludge disposal are often limited by their environmental impact and economic demands. Pyrolysis has been studied as a viable method for sewage sludge disposal and transformation into usable products. Pyrolytic products may have various uses, and their complex characteristics shall be described to assess their potential for safe utilization. Here, we studied slow pyrolysis of stabilized sewage sludge in a fixed bed reactor at 400–800 °C to describe the composition of the pyrolysis gas and the condensate fraction. We found that condensate elemental composition was practically independent of pyrolysis temperature. On the other hand, the composition of the pyrolysis gas was strongly temperature-dependent regarding both the share of major components (H2, CO, CO2, CH4) and C2–C6 hydrocarbons speciation (which as a sum attributed to 7–9 vol. % of the gas). The increase in pyrolysis temperature also resulted in increasing the N2 content of the gas, whereas the sulfur containing gas compounds were substantially diluted in the increasing gas volume.

show abstract

Section: Introductionmentioning

confidence: 99%

Detailed Analysis of Sewage Sludge Pyrolysis Gas: Effect of Pyrolysis Temperature

et al. 2020

View full text Add to dashboard Cite

show abstract

“…For example, Cao et al [63] found that a high-concentration NH 3 was generated in the sewage sludge pyrolysis process, while high-concentration HCN was detected in the study by Tian et al [66]. Organic sulfur in sewage sludge should not be neglected, including sulphonic acid, sulphoxide, aromatic sulfur and aliphatic sulfur [67], and decomposition of aromatic sulfur and aliphatic sulfur formed sulfur-containing gases in pyrolysis/ gasification of sewage sludge. It should also be noted that these sulfur-containing gases would corrode metal surfaces, and be oxidized to SO x .…”

Section: Formation Of No X and So X Precursorsmentioning

confidence: 99%

“…aromatic sulfur and aliphatic sulfur, via C-S bond cleavage at low temperatures [91]. H 2 S was the dominant sulfur-containing gas produced from thermal treatment of sewage sludge [67]. Alkali catalysts/additives have proved effective for reducing the emission of sulfur-containing gases from low-temperature pyrolysis of sewage sludge [92] owing to the alkalicatalyzed C-S bond cleavage at a high temperature or fixation of sulfur in the solid products by the alkali additives [93,94]; (iii) post-pyrolysis/gasification approaches -cold/hot cleaning of the producer gas.…”

Section: Controlling Of No X and So X Precursors Emission In Sewage Sludge Pyrolysis/gasificationmentioning

confidence: 99%

Thermochemical conversion of sewage sludge for energy and resource recovery: technical challenges and prospects

Zhang

et al. 2021

Environmental Pollutants and Bioavailability

View full text Add to dashboard Cite

Thermochemical processes are considered as a promising technology for sewage sludge management, which could achieve volume reduction, energy and resource recovery, and effective destruction of pathogens. However, there are still many technology limitations and challenges of the thermochemical processes toward industrialization and commercialization. This review first briefly discusses the impact of sewage sludge on environmental sustainability and its current treatment and disposal methods. Typical thermochemical conversion technologies i.e., incineration/combustion, pyrolysis, gasification, and hydrothermal liquefaction for energy and resource recovery from sewage sludge are then comprehensively summarized. Subsequently, the technical challenges of thermochemical conversion of sewage sludge and the solutions that have been and/or are being developed to address the challenges are in-depth analyzed. Meanwhile, the prospects and future directions of the thermochemical technologies are outlined. In addition, the economic analysis and life cycle assessment of thermochemical conversion technologies are evaluated. Finally, the conclusions are put forward.

show abstract

“…Sulphur in sewage sludge is present in both organic and inorganic forms (sulphates, sulphides). The reduction of sulphates and decomposition of organic sulphur leads to the formation of H 2 S, CH 3 SH, COS, CS 2 which are unpleasant compounds and can be easily converted to SO 2 during combustion [6], [7]. Additionally, transformation of sulphur in the sludge was observed by XPS analysis, suggesting that a part of organic sulphur may be transformed into inorganic sulphide and sulphate during pyrolysis [8].…”

Section: Introductionmentioning

confidence: 99%

Batch Reactor Pyrolysis of Stabilized Sewage Sludge: Product Analysis and Sulphur Balance

Moško

Pohořelý

Skoblia

et al. 2018

WIT Transactions on Ecology and the Environment

View full text Add to dashboard Cite

Prior to sewage sludge application to agricultural soil, the sludge should be treated appropriately to suppress its negative features like content of microorganic pollutants or leaching heavy metals. Pyrolysis has been investigated as one way of producing sewage sludge-derived biochar (solid pyrolysis residue) which is stable and less toxic than sewage sludge. A significant amount of heat must be provided to the pyrolysis process due to its endothermic character. To make the process economically and energy efficient, the necessary heat can be obtained by the combustion of primary pyrolysis products (pyrolysis oil and gas), however in the case of sewage sludge, attention must be paid to the resulting gaseous pollutants due to high nitrogen and sulphur content. Slow pyrolysis of stabilized sewage sludge in inert helium atmosphere was performed at temperatures 400-800°C in order to examine the influence of pyrolysis temperature on the properties of pyrolysis products and sulphur distribution amongst these products. Pyrolysis at higher temperatures resulted in lesser biochar yield and promoted gas yield. At temperatures of 500°C and higher, over 50% of energy bound in the input sewage sludge was transformed to liquid and gas products. Finally, the effect of pyrolysis temperature on sulphur distribution amongst pyrolysis products was only marginal.

show abstract

Release of organic sulfur as sulfur-containing gases during low temperature pyrolysis of sewage sludge

Cited by 84 publications

References 18 publications

Detailed Analysis of Sewage Sludge Pyrolysis Gas: Effect of Pyrolysis Temperature

Detailed Analysis of Sewage Sludge Pyrolysis Gas: Effect of Pyrolysis Temperature

Thermochemical conversion of sewage sludge for energy and resource recovery: technical challenges and prospects

Batch Reactor Pyrolysis of Stabilized Sewage Sludge: Product Analysis and Sulphur Balance

Contact Info

Product

Resources

About