Inhibition of element sulfur and calcium oxide on the formation of PCDD/Fs during co-combustion experiment of municipal solid waste

Ma, Hongting; Du, Na; Lin, Xueyin; Liu, Chaofan; Zhang, Jingyu; Miao, Zhuangzhuang

doi:10.1016/j.scitotenv.2018.03.282

Cited by 30 publications

(16 citation statements)

References 36 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The formation of PCDD/Fs requires carbon, chlorine, oxygen, and metal catalysts and reducing chlorine and weakening the catalytic activities is beneficial to suppress the formation of PCDD/Fs [39].…”

Section: Inhibition Mechanismsmentioning

confidence: 99%

The Effect of Adjusting Sinter Raw Mix on Dioxins from Iron Ore Co-Sintering with Municipal Solid Waste Incineration Fly Ash

Guo

Peng

et al. 2022

Energies

View full text Add to dashboard Cite

The inhibition effect of calcined lime (CaO) and limestone (CaCO3) on the formation of dioxins during iron ore co-sintering with fly ash was investigated in a sinter pot in the present work. Experimental results indicated that international total toxicity equivalent concentration of dioxins decreased from 1.4335 to 0.2922, 0.1048, 0.4562, and 0.3098 ng I-TEQ Nm−3 under four different experimental conditions. It can be concluded that 5 wt.% calcined lime with 3 wt.% limestone is the optimal addition to reduce the concentration of dioxins in flue gas, with 92.70% inhibition efficiency. Effects on dioxin distribution was also analyzed. The distribution proportion of low-chlorinated dioxins was found to increase, while that of high-chlorinated dioxins decreased, except for octachlorianted dibenzo-p-dioxins (OCDD). The reason is that the consumption of HCl not only inhibits the de novo synthesis, but also dramatically promotes the condensation and dechlorination to produce more tetrachlorianted dibenzo-p-dioxins and octachlorianted dibenzo-p-dioxins through precursors. Finally, condensation, dichlorination, and inhibition mechanisms of dioxins during co-sintering with municipal solid waste incineration (MSWI) fly ash are proposed.

show abstract

Section: Inhibition Mechanismsmentioning

confidence: 99%

The Effect of Adjusting Sinter Raw Mix on Dioxins from Iron Ore Co-Sintering with Municipal Solid Waste Incineration Fly Ash

Guo

Peng

et al. 2022

Energies

View full text Add to dashboard Cite

show abstract

“…On the other hand, Ma et al [31] studied the effect of the presence of calcium oxide (CaO) and elemental sulfur (S) on the formation of PCDD/Fs during the municipal solid waste combustion process in laboratory runs performed at 800 • C. They concluded that both substances could primarily consume chlorine sources or weaken chlorination in the PCDD/F formation process to slow down PCDF formation, but the inhibition mechanisms of sulphur and calcium oxide were different. Comparing the inhibitory effect of S with that of CaO, the inhibitory effect of S on the formation of hepta-congeners (HpCDD/Fs) was more remarkable, around 88.1%; on the other hand, CaO is especially active in the inhibition of the formation of hexa-congeners of dioxins and furans more clearly than sulfur, and the inhibition was 85.1%.…”

Section: Inhibition In the Dioxins And Furans Formation By S-and N-containing Compoundsmentioning

confidence: 99%

Sewage Sludge as Inhibitor of the Formation of Persistent Organic Pollutants during Incineration

Conesa

2021

Sustainability

View full text Add to dashboard Cite

With the objective of suppressing dioxins and furans (PCDD/Fs) emission in municipal solid waste incineration plants (MSWI), different chemical inhibitors have been tested. Among these inhibitors, nitrogen and sulphur compounds can significantly suppress PCDD/Fs formation via de novo synthesis, which gives very interesting results with very little capital investment. In recent years, the possibility of using waste rich in nitrogen and/or sulphur as a source of inhibitor compounds has been considered, and thus has reduced the emissions of pollutants while the waste is treated. The effect of adding sludge from urban sewage treatment plants in three variants has been specially studied: directly mixing the waste, using the decomposition gas of the previously dried sludge, and using the decomposition gas of the sludge together with other inhibitors such as thiourea. Reduction of emissions in laboratory tests using model samples indicated the efficiency to be higher than 99%, using sewage sludge (SS) as an inhibitor whereas, in actual MSWI plants, the efficiency can be as high as 90%.

show abstract

“…Therefore, it is closely related to carcinogenicity and teratogenicity, and is classified as persistent organic pollutants. 4 It's called "dioxins" for short, but in fact it consists of 75 types of PCDD and 135 types of PCDF 5 , as well as their structures have been shown in Figure 1. It should be pointed out that only 17 toxic PCDD/Fs isomers have attracted much attention, and 2,3,7,8-tetrachlorodibenzo-p-dioxin (TCDD) is the most toxic one.…”

Section: Introductionmentioning

confidence: 99%

Study on Correlation Characteristics of PCDD/Fs Isomers Generation during the Coal-Combustion Process with Sludge Mixing

Wang

Wei²,

Song

et al. 2022

Fine Chemical Engineering

View full text Add to dashboard Cite

The 17 toxic polychlorinated dibenzo-p-dioxins and dibenzofurans (PCDD/Fs) isomers as a persistent and refractory organic pollutant are one of the pollutants produced in solid fuel (including pulverized coal and mixed fuel) combustion, and regulating their distribution characteristics is an important aspect of effectively reducing their toxic equivalent. In this study, a correlation model of PCDD/Fs toxic equivalent was proposed to quantitatively analyze the correlation between HCl and SO2 concentrations in the reaction atmosphere, meanwhile, a pathway-diagnosis method of PCDD/Fs isomers transformation was adopted to analyze the PCDD/Fs distribution characteristics of coal combustion and that mixed with 10% sludge. The results show that the inflection point for the derivative of the relationship between HCl concentration and SO2 concentration moves towards the direction of lower SO2 concentration and higher HCl concentration with the increase of PCDD/Fs toxic equivalent. Besides, the functional pathways of mixing sludge on PCDD/Fs generation in coal combustion were obtained by calculating chlorine substitution probability. It has been deduced that five transformation pathways were improved by mixing sludge. Next, the critical pathways of the influence from mixing sludge on the distribution characteristics of PCDD/Fs isomers in coal combustion were analyzed by drawing the percentage content migration diagram of PCDD/Fs isomers and the average toxic equivalent migration diagram that combined with the toxic equivalent of PCDD/Fs isomers. The results showed that the main reasons for mixing sludge to further reduce the average toxic equivalent of PCDD/Fs isomers in coal combustion were the increased chlorine substitution probability at the 4-position of 12378 Pentachlorodibenzo-p-dioxin (12378-PeCDD), the decreased chlorine substitution probability at the 4-position of 2378 Tetrachlorodibenzo-p-furan (2378-TeCDF), and the increased total chlorine substitution probability of 23478 Pentachlorodibenzo-p-furan (23478-PeCDF), 123478-Hexachlorodibenzofuran (123478-HxCDF) and 123678-HxCDF respectively. Finally, the functional pathway diagram of PCDD/Fs isomers generated from coal combustion with sludge mixing was drawn.

show abstract

Inhibition of element sulfur and calcium oxide on the formation of PCDD/Fs during co-combustion experiment of municipal solid waste

Cited by 30 publications

References 36 publications

The Effect of Adjusting Sinter Raw Mix on Dioxins from Iron Ore Co-Sintering with Municipal Solid Waste Incineration Fly Ash

The Effect of Adjusting Sinter Raw Mix on Dioxins from Iron Ore Co-Sintering with Municipal Solid Waste Incineration Fly Ash

Sewage Sludge as Inhibitor of the Formation of Persistent Organic Pollutants during Incineration

Study on Correlation Characteristics of PCDD/Fs Isomers Generation during the Coal-Combustion Process with Sludge Mixing

Contact Info

Product

Resources

About