Combustion dioxin supression in municipal solid waste incineration with sulphur additives

Lindbauer, Ralf L.; Wurst, Friedrich Martin; Prey, Theodor

doi:10.1016/0045-6535(92)90162-k

Cited by 67 publications

(27 citation statements)

References 2 publications

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“…The result was in agreement with previous study that N-compounds could inhibit the formation of PCDD/Fs by poisoning metal catalytic, reacting with chlorine content and substituting Cl-or H-from precursors (Kuzuhara et al 2005;Yan et al 2012). However, we should consider both nitrogen content and chlorine content in the sludge to evaluate the inhibition ability of N-compounds, which was the same with the S/Cl molar ratio did (Lindbauer et al 1992;Raghunathan and Gullett 1996;Lu et al 2007;Wu et al 2012). Only when the N/Cl molar ratio reaches a level can it work.…”

Section: Resultsmentioning

confidence: 99%

Influence of organic and inorganic flocculants on the formation of PCDD/Fs during sewage sludge incineration

Lin

et al. 2014

Environ Sci Pollut Res

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Flocculants are widely used to improve the properties of sludge dewatering in industrial wastewater treatment. However, there have been no studies conducted on the influence of flocculants on the formation of polychlorinated dibenzo-p-dioxin and dibenzofurans (PCDD/Fs) during sewage sludge incineration. This paper selected three typical kinds of flocculants, including polyacrylamide (PAM), poly-ferric chloride (PFC), and polyaluminum chloride (PAC) flocculant, to study their influences on the formation of PCDD/Fs during sewage sludge incineration. The results indicated that PAM flocculant, which is an organic flocculant, inhibited the formation of PCDD/Fs in sewage sludge incineration, while inorganic flocculant, such as PFC and PAC flocculant, promoted the formation. The most probable explanation is that the amino content in the PAM flocculant acted as an inhibitor in the formation of PCDD/Fs, while the chlorine content, especially the metal catalyst in the PFC and PAC flocculants, increased the formation rate. The addition of flocculants nearly did not change the distribution of PCDD/F homologues. The PCDFs contributed the most toxic equivalent (TEQ) value, especially 2, 3, 4, 7, 8-PeCDF. Therefore, the use of inorganic flocculants in industrial wastewater treatment should be further assessed and possibly needs to be strictly regulated if the sludge is incinerated. From this aspect, a priority to the use of organic flocculants should be given.

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Section: Resultsmentioning

confidence: 99%

Influence of organic and inorganic flocculants on the formation of PCDD/Fs during sewage sludge incineration

Lin

et al. 2014

Environ Sci Pollut Res

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“…Furthermore, the reduction efficiencies of urea on PCDD/Fs formation at 0.1%, 0.5% and 1.0% of the fuel feed were 64%, 75% and 90%, respectively (Ruokojärvi et al, 2001). Most importantly, the efficiency of reducing PCDD/Fs formation by addition of sulfur is strongly influenced by the S/Cl mole ratio (Lindbauer et al, 1992, Raghunathan and Gullett 1996, Duo and Leclerc 2004, and thus the DS dosage could further influence the suppression efficiency of PCDD/Fs.…”

Section: Pcdd/f Inhibition By Sdg Effect Of Ds Dosagementioning

confidence: 91%

“…Sludge decomposition gases (SDG), evolving from mild thermal decomposition of sewage sludge, contain NH 3 and SO 2 as well as other, unidentified N-and S-compounds (Lindbauer et al, 1992;Hong et al, 2009;Lu et al, 2013;Chen et al, 2014). It was observed that these SDG are able to suppress up to 69.5% of the PCDD/Fs amount and 78.7% of TEQ , yet the dosage, temperature, moisture and oxygen content during sludge decomposition could all affect the release characteristics of actively inhibiting N-and S-compounds.…”

Section: Introductionmentioning

confidence: 99%

PCDD/Fs Inhibition by Sludge Decomposition Gases: Effects of Sludge Dosage, Treatment Temperature and Oxygen Content

Chen

Zhan

Lin

et al. 2015

Aerosol Air Qual. Res.

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Sludge decomposition gases (SDG) have been identified as potential PCDD/F-inhibitors, since they contain high concentrations of NH 3 and SO 2 as well as various unidentified N-and S-compounds. The effects of sludge dosage, its treatment temperature and oxygen content on PCDD/Fs suppression were observed during test runs using a model fly ash (MFA) system, generating high chlorinated PCDD/Fs. The experiments were carried out in two parts: a first set with SDG of undefined composition, and a second with injection of NH 3 and SO 2 combined in three different concentration ratios. It was observed that the SDG evolving from dried sludge (DS) could suppress the formation of 2,3,7,8-substituted PCDD/Fs even with very high efficiency (> 99%), both in weight units and in I-TEQ units. Such suppression was somewhat stronger for PCDD than PCDF. It was also found that 300°C might be a suitable sludge decomposition temperature when using SDG as suppressant in PCDD/Fs inhibition. Moreover, the oxygen content only slightly influenced upon the suppression capabilities. The results revealed that SO 2 was more effective than NH 3 in suppressing PCDD/Fs formation, with suppression efficiencies of 61.9% and 38.6%, respectively. Remarkably, the formation of OCDD/Fs was inhibited least and even further formation could occur when both NH 3 and SO 2 were injected together as simulated flue gas. The results exposed that NH 3 and SO 2 might be the primary PCDD/Fs suppressants resulting from mild thermal decomposition of sludge. However, further parameters should be evaluated and adjusted before SDG could be used in large-scale applications.

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“…During the extensive research into waste combustion processes, it was concluded that the presence of sulphur dioxide in the combustion zone decreases to a large extent the amount of dioxins. Indeed, in the gas phase one may observe [47,48] the reaction between chlorine and sulphur dioxide:…”

Section: Methods Of Dioxins Emission Reductionmentioning

confidence: 99%

The Possibilities of Reduction of Polychlorinated Dibenzo-P-Dioxins and Polychlorinated Dibenzofurans Emission

Wielgosiński

2010

International Journal of Chemical Engineering

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In the study the most important and known polychlorinated dibenzo-p-dioxins (PCDDs) and polychlorinated dibenzo-furans (PCDFs) emission sources are presented and known methods of reduction of dioxin emission to the atmosphere are discussed in detail. It is indicated that the most relevant emission source is a combustion process. The mechanism of dioxin formation in thermal processes is presented in brief. The author characterized primary methods of reduction of PCDDs/PCDFs emission encompassing the interference into the combustion process to minimize their formation and discussed known secondary methods aimed at their removal from the stream of waste gases. It was attempted to make a critical assessment of PCDD/Fs reduction methods described in literature.

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Combustion dioxin supression in municipal solid waste incineration with sulphur additives

Cited by 67 publications

References 2 publications

Influence of organic and inorganic flocculants on the formation of PCDD/Fs during sewage sludge incineration

Influence of organic and inorganic flocculants on the formation of PCDD/Fs during sewage sludge incineration

PCDD/Fs Inhibition by Sludge Decomposition Gases: Effects of Sludge Dosage, Treatment Temperature and Oxygen Content

The Possibilities of Reduction of Polychlorinated Dibenzo-P-Dioxins and Polychlorinated Dibenzofurans Emission

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