摘要
Polychlorinated dibenzo-p-dioxins and furans(PCDD/Fs)generated from municipal solid waste(MSW)incineration are considered as the key pollutants,which could pose serious risks to the environment and ecology.This study comprehensively investigated the effect of selective catalytic reduction(SCR)system on PCDD/F removal,phase distributions,and migrationtransformation characteristics of 17 congeners in a full-scale MSW incinerator.The three flue gas samples and two fly ash samples were separately collected for PCDD/F analysis.The results showed that the SCR system reduced the I-TEQ concentration of PCDD/Fs from 0.135 to 0.010 ng I-TEQ Nm^(−3)with a remarkable toxicity removal efficiency of 92.6%,through oxidation decomposition over V_(2)O_(5)-WO_(3)/TiO_(2)catalysts and chlorination process of low-chlorinated congeners.In addition,the de novo synthesis observed along the flue between SCR system and stack regenerated unexpected PCDD/Fs,which might enhance the PCDD/F emission level.This study verified the three pathways of SCR system on PCDD/F removal and inspired operating suggestions for SCR system,i.e.,keeping SCR system operated in stable and consistent conditions,regularly replacing V_(2)O_(5)-WO_(3)/TiO_(2)catalysts,and timely cleaning the dusts and inlet materials of SCR system,which would be beneficial for achieving the ultra-low emission of PCDD/Fs in full-scale MSW incinerators.
基金
supported by the National Key R&D Program of China(Grant No. 2018YFC1902904)
the National Natural Science Foundation of China (Grant No. 22008104)
the Shenzhen Science and Technology Innovation Committee (Grant Nos. JCYJ20200109141642225,JCYJ20200109141227141, and JSGG20210713091810035)
the Shenzhen Peacock Plan (Grant No. KQTD20160226195840229)
provided by Basic and Applied Basic Research Foundation of Guangdong Province (Grant No. 2021A1515010148)
Young S&T Talent Training Program of Guangdong Provincial Association for S&T(Grant No. SKXRC202230)
Guangdong Province Universities and Colleges Pearl River Scholar Funded Scheme 2018
