A field study of polychlorinated dibenzo-p-dioxins and dibenzofurans formation mechanism in a hazardous waste incinerator: Emission reduction strategies

Wang, Chen1,2,3; Xu, Jiyun4; Yang, Zhenzhou5,6; Zhang, Zuotai1,2; Cai, Zongwei3

2019-09-20

10.1016/j.jclepro.2019.06.020

Journal of Cleaner Production   影响因子和分区

0959-6526

1879-1786

To clarify the dominant formation mechanism of polychlorinated dibenzo-p-dioxins and dibenzofurans (PCDD/Fs) and reduce PCDD/F emissions in full-scale hazardous waste incinerators (HWIs), three tests were designed by adding different PCDD/F precursors in phenol-containing raw material. Flue gas from three stages of the incineration facility, as well as bottom ash and fly ash were collected to investigate formation pathways, emission characteristics and mass balance of PCDD/Fs. The results showed that in tests A and C, the PCDD/F emission levels were 0.02 and 0.83 ng I-TEQ Nm(-3), with adding naphthalene and p-dichlorobenzene, respectively. Test B, the control group, only incinerated raw materials, resulting in 0.72 ng I-TEQ Nm(-3) PCDD/F emissions. PCDD/F formation mechanism analysis suggested that high-temperature radical-molecule reaction was the dominate pathway in test A, while for test B, memory effect in the air pollution control devices (APCDs) led to high PCDD/F emissions. With the addition of p-dichlorobenzene in test C, PCDD/F levels at the quenching tower outlet were one order of magnitude higher than those observed at the inlet, indicating that the quenching tower failed to suppress the formation of PCDD/Fs. The PCDD/PCDF ratios indicate that with the abundance of PCDD/F precursors, surface-mediated precursor reaction is the dominant formation mechanism in low-temperature stages. These finding raise the following strategies for industry to control PCDD/F emissions: (1) strict regulation of the organochlorine content in feed material; (2) frequent and thorough cleaning the APCDs; (3) optimizing the injection rate of activated carbon. (C) 2019 Elsevier Ltd. All rights reserved.

PCDD/Fs Hazardous waste incinerator Formation mechanism Emission reduction strategies Quenching tower

SCI ; EI

英语

第一 ; 通讯

Shenzhen Science and Technology Innovation Committee[JCYJ20170412154335393]

Science & Technology - Other Topics ; Engineering ; Environmental Sciences & Ecology

Green & Sustainable Science & Technology ; Engineering, Environmental ; Environmental Sciences

WOS:000477784000087

ELSEVIER SCI LTD

20192407038085

Activated carbon ; Air pollution ; Air pollution control equipment ; Ash handling ; Emission control ; Fly ash ; Hazardous materials ; Hazards ; Naphthalene ; Organic pollutants ; Polyols ; Quenching ; Stages ; Surface reactions ; Temperature ; Waste incineration

Public Buildings:402.2 ; Air Pollution:451 ; Air Pollution Control:451.2 ; Industrial Wastes Treatment and Disposal:452.4 ; Heat Treatment Processes:537.1 ; Thermodynamics:641.1 ; Materials Handling Equipment:691.1 ; Chemical Reactions:802.2 ; Chemical Products Generally:804 ; Organic Compounds:804.1 ; Food Products:822.3 ; Accidents and Accident Prevention:914.1

Web of Science

1.Southern Univ Sci & Technol, Sch Environm Sci & Engn, Shenzhen 518055, Peoples R China
2.Southern Univ Sci & Technol, Key Lab Municipal Solid Waste Recycling Technol &, Shenzhen 518055, Peoples R China
3.Hong Kong Baptist Univ, Dept Chem, State Key Lab Environm & Biol Anal, Hong Kong, Peoples R China
4.China Everbright Greentech LTD, Hong Kong, Peoples R China
5.Peking Univ, Coll Engn, Beijing Key Lab Solid Waste Utilizat & Management, Beijing 100871, Peoples R China
6.Peking Univ, Coll Engn, Dept Energy & Resource Engn, Beijing 100871, Peoples R China

Wang, Chen,Xu, Jiyun,Yang, Zhenzhou,et al. A field study of polychlorinated dibenzo-p-dioxins and dibenzofurans formation mechanism in a hazardous waste incinerator: Emission reduction strategies[J]. Journal of Cleaner Production,2019,232:1018-1027.

Wang, Chen,Xu, Jiyun,Yang, Zhenzhou,Zhang, Zuotai,&Cai, Zongwei.(2019).A field study of polychlorinated dibenzo-p-dioxins and dibenzofurans formation mechanism in a hazardous waste incinerator: Emission reduction strategies.Journal of Cleaner Production,232,1018-1027.

Wang, Chen,et al."A field study of polychlorinated dibenzo-p-dioxins and dibenzofurans formation mechanism in a hazardous waste incinerator: Emission reduction strategies".Journal of Cleaner Production 232(2019):1018-1027.