Effects of a quenching treatment on PCDD/F reduction in the bottom ash of a lab waste incinerator to save the energy and cost incurred from post-thermal treatment

Lin, Sheng Lun; Lee, Kuan Lin; Wu, Jhong-Lin; Cheruiyot, Nicholas Kiprotich

doi:10.1016/j.wasman.2019.06.024

Cited by 21 publications

(4 citation statements)

References 33 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This effectively inhibits PCDD/F formation or promotes their decomposition. Studies have shown that quenching slag at temperatures above 400 • C results in a PCDD/F content only 1/300th of that observed with gradual cooling below 200 • C [57]. Rapid quenching is also an effective measure to prevent the generation of hazardous compounds [58].…”

Section: Output Of Pcde Congenersmentioning

confidence: 99%

Impact of Integrating Flameless Combustion Technology and Sludge–Fly Ash Recirculation on PCDE Emissions in Hazardous Waste Thermal Treatment Systems

Lin,

Duan,

et al. 2024

Atmosphere

Self Cite

View full text Add to dashboard Cite

Polychlorinated diphenyl ethers (PCDEs), persistent environmental pollutants, are found in flue gas from incinerators. While air pollution control systems (APCSs) capture pollutants, the resulting sludge/fly ash (SFA) requires further treatment due to residual PCDEs and other harmful substances. This study investigated a hazardous waste thermal treatment system (HAWTTS) utilizing flameless combustion technology alongside a multistage APCS (scrubbers, cyclone demisters, bag houses). SFA from the APCS was recirculated for secondary combustion. PCDE levels were measured before and after each unit within the HAWTTS. The HAWTTS achieved a remarkable overall PCDE removal efficiency of 99%. However, the incinerator alone was less effective for low-chlorine PCDEs. Scrubbers and bag houses exhibited lower removal efficiencies (17.8% and 30.9%, respectively) due to the memory effect. Conversely, the cyclone demister achieved a high removal rate (98.2%). Following complete APCS treatment, PCDE emissions were significantly reduced to 1.02 ng/Nm3. While SFA still contained some PCDEs, the flameless combustion’s uniform temperature distribution enhanced combustion efficiency, minimizing overall PCDE emissions. This system demonstrates significant potential for mitigating PCDE pollution from incinerators. Further research could focus on optimizing treatment processes to address residual PCDEs in SFA.

show abstract

Section: Output Of Pcde Congenersmentioning

confidence: 99%

Impact of Integrating Flameless Combustion Technology and Sludge–Fly Ash Recirculation on PCDE Emissions in Hazardous Waste Thermal Treatment Systems

Lin,

Duan,

et al. 2024

Atmosphere

Self Cite

View full text Add to dashboard Cite

show abstract

“…11 It can be found that chlorine sources (HCl and Cl 2 ) are the key factors for both high-temperature gas-phase conversion and low-temperature heterogeneous synthesis. Some researches revealed that solid fuels release chlorine mainly in the form of HCl 12 be converted into Cl 2 through Deacon reaction, 9 and the activity of Cl 2 is much higher than that of HCl, 10 thus promoting chlorination in the PCDD/F generation process.…”

Section: Introductionmentioning

confidence: 99%

“…Solid fuel incineration is one of the main sources of PCDD/Fs, including municipal solid waste and plastic waste . At present, the research on the generation mechanism of PCDD/Fs has been refined according to the conversion temperature and site, including high-temperature gas-phase conversion (temperature range 500–800 °C) and low-temperature heterogeneous synthesis (temperature range 200–500 °C). Studies have shown that some PCDD/Fs can be directly generated by chlorination of gaseous components such as hydrocarbons and phenols under the action of chlorine sources and heterogeneous synthesis of carbon residue under the action of catalytic metals on the fly ash surface with O 2 and chlorine sources .…”

Section: Introductionmentioning

confidence: 99%

“…It can be found that chlorine sources (HCl and Cl 2 ) are the key factors for both high-temperature gas-phase conversion and low-temperature heterogeneous synthesis. Some researches revealed that solid fuels release chlorine mainly in the form of HCl under high temperature conditions, but in the presence of O 2 , it can be converted into Cl 2 through Deacon reaction, and the activity of Cl 2 is much higher than that of HCl, thus promoting chlorination in the PCDD/F generation process. In terms of determining the PCDD/F generation pathway, most of research studies have been carried out for some specific generation pathways.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Function Pathways of CaO Decoration on the Internal Transformation of PCDD/Fs Isomers for Chemical Looping Combustion of Plastic Waste

et al. 2020

View full text Add to dashboard Cite

The distribution characteristics of 17 toxic polychlorinated dibenzodioxin/furan (PCDD/F) isomers are closely related to their toxic equivalents, and hence, knowing the transformation and contribution pathways among PCDD/F isomers is the foundation of selectively regulating their isomer emissions. Based on the relevance of PCDD/F isomers, a pathway substitution (PTWS) prediction method among PCDD/F isomers was proposed and employed in this work. First, the accuracy of the PTWS prediction method was confirmed by taking the chemical looping combustion (CLC) of plastic waste (including Fe-based CLC and that with CaO decoration) experimental data as an example and comparing it with the existing position-substitution (PSTS) prediction method. The evaluation indexes include similarity (S), average percentage content error (C), and maximum percentage content error (Z). Second, the effects of CaO decoration on the single chlorine substitution pathway were compared by calculating the chlorine substitution probability. The results show three decreasing chlorine substitution probabilities for the main transformation pathways which are affected by CaO decoration. In addition, the PCDD/F percentage content migration pathway diagrams were drawn to further confirm the critical pathways that affect the distribution of PCDD/F isomers. Finally, the mean toxic equivalent migration situations of PCDD/Fs were calculated according to the toxic equivalents and chlorine substitution probabilities of PCDD/F isomers. The results showed that CaO decoration further reduced the chlorine substitution probability of 1,2,3,7,8-PeCDD, which was identified as the main reason for the increase of the mean toxic equivalents of PCDD, while it slightly altered the mean toxic equivalent for PCDFs. This study can provide a new theoretical basis for further exploring the low PCDD/F emission technology in the CLC process of plastic waste.

show abstract

Revolutionizing waste-to-energy: harnessing the power of triboelectric nanogenerators

Kumar,

Hajra,

Mohana Rani

et al. 2024

Adv Compos Hybrid Mater

View full text Add to dashboard Cite

Effects of a quenching treatment on PCDD/F reduction in the bottom ash of a lab waste incinerator to save the energy and cost incurred from post-thermal treatment

Cited by 21 publications

References 33 publications

Impact of Integrating Flameless Combustion Technology and Sludge–Fly Ash Recirculation on PCDE Emissions in Hazardous Waste Thermal Treatment Systems

Impact of Integrating Flameless Combustion Technology and Sludge–Fly Ash Recirculation on PCDE Emissions in Hazardous Waste Thermal Treatment Systems

Function Pathways of CaO Decoration on the Internal Transformation of PCDD/Fs Isomers for Chemical Looping Combustion of Plastic Waste

Revolutionizing waste-to-energy: harnessing the power of triboelectric nanogenerators

Contact Info

Product

Resources

About