The co-removal of PCDD/Fs by SCR system in a full-scale municipal solid waste incinerator: Migration-transformation and decomposition pathways

Wang, Pengju; Yan, Feng; Xie, Feng; Cai, Jianjun; Shen, Xuehua; Wei, Xuankun; Huang, Junbin; Li, ZhongZheng; Zhong, Rigang; Zhang, ZuoTai

doi:10.1007/s11431-022-2127-y

Cited by 10 publications

(1 citation statement)

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“…Under typical operating conditions, the MSW initially undergoes a 5-day fermentation process in the waste pool and is then grabbed into the waste feeder (16.67 t/h). The combustion conditions of the MSW incinerator follow the principle of “3 T + E” . In this study, to determine the inhibition mechanism and PCDD/F migration-transformation characteristics, two flue gas (FG) and three fly ash (FA) sampling sites were set to collect PCDD/Fs in flue gas and fly ash, including (A) at the economizer outlet, (B) at the stack inlet, (C) at the ash outlet of horizontal flue #1 (HF-1 outlet), (D) at the ash outlet of horizontal flue #4 (HF-4 outlet), and (E) at the ash outlet of FF (FF outlet).…”

Section: Methodsmentioning

confidence: 99%

Inhibitory Effect and Mechanism of an N-S-Based Inhibitor (CH₄N₂S) on PCDD/Fs in Flue Gas and Fly Ash in a Full-Scale Municipal Solid Waste Incinerator

et al. 2023

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Traditional strategies for controlling polychlorinated dibenzo-p-dioxins/furans (PCDD/Fs) emission in municipal solid waste (MSW) incineration merely involve the transfer of PCDD/Fs from flue gas to fly ash and ignore the reduction in PCDD/F generation, which might enhance the difficulty associated with the disposal of fly ash and pose potential environmental risks. In this study, we conducted a PCDD/F inhibition experiment in a full-scale MSW incinerator (400 t/day) to determine the inhibition effect and action mechanism of an N-S-based inhibitor (thiourea). The results demonstrated that thiourea achieved the remarkable PCDD/F inhibition efficiencies of 44.3% (54.5% for I-TEQ) in flue gas and 91.4% (71.7% for I-TEQ) in fly ash. The variation in the ∑PCDF:∑PCDD ratio implied that the inhibitor demonstrated higher efficacy in inhibiting the de novo synthesis in flue gas and blocking the precursor reaction in fly ash. Thiourea would gradually decompose to continuously release SO2 and NH3 at the temperatures between 240 and 400 °C, which could poison the metal catalysts and weaken the chlorination capability. Additionally, the reduction of reaction and catalytic sites caused by particle aggregation in fly ash contributed to PCDD/F generation inhibition. This study revealed the inhibition effect and the underlying mechanism of an N-S-based inhibitor on PCDD/F toxicity along the post-combustion area and will pave the way for further industrial applications.

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Section: Methodsmentioning

confidence: 99%

Inhibitory Effect and Mechanism of an N-S-Based Inhibitor (CH₄N₂S) on PCDD/Fs in Flue Gas and Fly Ash in a Full-Scale Municipal Solid Waste Incinerator

et al. 2023

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Event-triggered fuzzy neural multivariable control for a municipal solid waste incineration process

Ding,

Qiao,

Huang

et al. 2023

Sci. China Technol. Sci.

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Influence of different loads on PCDD/F removal by SCR during municipal solid waste incineration

Ying

et al. 2023

Chemosphere

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The co-removal of PCDD/Fs by SCR system in a full-scale municipal solid waste incinerator: Migration-transformation and decomposition pathways

Cited by 10 publications

References 50 publications

Inhibitory Effect and Mechanism of an N-S-Based Inhibitor (CH₄N₂S) on PCDD/Fs in Flue Gas and Fly Ash in a Full-Scale Municipal Solid Waste Incinerator

Inhibitory Effect and Mechanism of an N-S-Based Inhibitor (CH₄N₂S) on PCDD/Fs in Flue Gas and Fly Ash in a Full-Scale Municipal Solid Waste Incinerator

Event-triggered fuzzy neural multivariable control for a municipal solid waste incineration process

Influence of different loads on PCDD/F removal by SCR during municipal solid waste incineration

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The co-removal of PCDD/Fs by SCR system in a full-scale municipal solid waste incinerator: Migration-transformation and decomposition pathways

Cited by 10 publications

References 50 publications

Inhibitory Effect and Mechanism of an N-S-Based Inhibitor (CH4N2S) on PCDD/Fs in Flue Gas and Fly Ash in a Full-Scale Municipal Solid Waste Incinerator

Inhibitory Effect and Mechanism of an N-S-Based Inhibitor (CH4N2S) on PCDD/Fs in Flue Gas and Fly Ash in a Full-Scale Municipal Solid Waste Incinerator

Event-triggered fuzzy neural multivariable control for a municipal solid waste incineration process

Influence of different loads on PCDD/F removal by SCR during municipal solid waste incineration

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Product

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Inhibitory Effect and Mechanism of an N-S-Based Inhibitor (CH₄N₂S) on PCDD/Fs in Flue Gas and Fly Ash in a Full-Scale Municipal Solid Waste Incinerator

Inhibitory Effect and Mechanism of an N-S-Based Inhibitor (CH₄N₂S) on PCDD/Fs in Flue Gas and Fly Ash in a Full-Scale Municipal Solid Waste Incinerator