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

Wang，Pengju1; Xie，Feng1; Yan，Feng1,2; Shen，Xuehua1; Wei，Xuan Kun1; Qu，Fan1; Su，Yiping1; Zhong，Rigang3; Li，Zhongzheng3; Zhang，Zuotai1,2

2023

10.1021/acsestengg.3c00132

ACS ES and T Engineering   Impact Factor & Quartile

2690-0645

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 SO and NH 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.

congener inhibition feature inhibition mechanism MSW incinerator N-S-based inhibitor PCDD/F inhibition

ESCI

English

First ; Corresponding

National Natural Science Foundation of China["22008104","52225407"] ; Shenzhen Science and Technology Innovation Committee["JCYJ20200109141642225","JCYJ20200109141227141","RCBS20210609104422047"] ; Shenzhen Peacock Plan[KQTD20160226195840229] ; Basic and Applied Basic Research Foundation of Guangdong Province[2021A1515010148]

Engineering

Engineering, Environmental

WOS:001049417400001

AMER CHEMICAL SOC

2-s2.0-85169005750

Scopus

1.School of Environmental Science and Engineering,Guangdong Provincial Key Laboratory of Soil and Groundwater Pollution Control,Southern University of Science and Technology,Shenzhen,518055,China
2.Key Laboratory of Municipal Solid Waste Recycling Technology and Management of Shenzhen City,Shenzhen,518055,China
3.Shenzhen Energy Environment,Co.,LTD,Shenzhen,518055,China

Wang，Pengju,Xie，Feng,Yan，Feng,et al. 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[J]. ACS ES and T Engineering,2023,3(10).

Wang，Pengju.,Xie，Feng.,Yan，Feng.,Shen，Xuehua.,Wei，Xuan Kun.,...&Zhang，Zuotai.(2023).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.ACS ES and T Engineering,3(10).

Wang，Pengju,et al."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".ACS ES and T Engineering 3.10(2023).