Partitioning of heavy metals during municipal solid waste incineration on a laboratory fluid bed furnace

Li, Jianxin; Yan, Jun; Chi, Yong

doi:10.1007/s11708-007-0054-2

Cited by 5 publications

(2 citation statements)

References 5 publications

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“…According to Figure b, stabilized rates of HMs in slag decreased with increasing amount of NaCl during the process of calcination. The reason was that heavy-metal chlorides have a higher vapor pressure, and the participation of Cl in thermal treatment of sludge delays the condensation of metal compounds, thereby exacerbating volatilization of HMs. , From Figure b, it can also see that the trends of decrease of Zn and Pb were more obvious than those of As and Cd; this was because that the gaseous HCl was produced by an intermediate mechanism in the removal of HMs (WO) by an inorganic chlorinating agent (MClx), which was different from the removal effect of Cl 2 on HMs. HCl was more favorable for the removal of Zn and Pb, therefore causing a large amount of volatilizing of Zn and Pb.…”

Section: Resultsmentioning

confidence: 97%

Comprehensive Evaluation of the Control Efficiency of Heavy-Metal Emissions during Two-Step Thermal Treatment of Sewage Sludge

Fang

Teng

et al. 2020

ACS Omega

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Recycling the phosphorus in sludge by incineration has received great interest at home and abroad. However, heavy metals (HMs) is a restrictive factor for SS thermal treatment. In this study, a comprehensive evaluation method was adopted to evaluate the comprehensive control efficiency of HM emissions during two-step thermal treatment (incineration–calcination). The effects of temperature, calcination time, and additives (CaO and NaCl) on leaching rates, stabilized rates, and comprehensive control efficiency of HM emissions were investigated. Results showed that comprehensive control efficiency increased significantly with an increase of temperature because of the transformation of chemical speciation from a leachable to a more stable combined form. Additives Cao and NaCl promoted the volatilization of HMs and reduced the comprehensive control efficiency. The highest comprehensive control efficiency of HM emissions was 78% when the incineration temperature reached 950 °C. Furthermore, a comparison was made between leaching rates, stabilized rates, and a comprehensive evaluation method. The results were inconsistent when leaching rates and stabilized rates were adopted. In contrast, when the comprehensive evaluation method was used, the results were coordinated and unique. This work can provide a promising approach for the evaluation of control efficiency of HM emissions during the process of thermal treatment of sludge.

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Section: Resultsmentioning

confidence: 97%

Comprehensive Evaluation of the Control Efficiency of Heavy-Metal Emissions during Two-Step Thermal Treatment of Sewage Sludge

Fang

Teng

et al. 2020

ACS Omega

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“…In addition, fuelblend chlorine and sulfur content and Cl/S ratio are key parameters for heavy metal volatilization. Research by Li et al 18 indicated that higher chloride content in municipal solid waste had a noticeable effect on heavy metal (e.g., Hg, Cd, and Zn) volatilization in a fluidized bed furnace. A study by Liu et al 19 showed that the addition of sulfur compounds reduces Cd volatilization by forming CdS and polymetallic sulfides that stabilize Cd in bottom ash during the sludge incineration process.…”

Section: Introductionmentioning

confidence: 99%

Co-combustion of Bituminous Coal and Pickling Sludge in a Drop-Tube Furnace: Thermodynamic Study and Experimental Data on the Distribution of Cr, Ni, Mn, As, Cu, Sb, Pb, Cd, Zn, and Sn

et al. 2017

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The effect of bituminous coal and pickling sludge co-combustion on the distributions of Cr, Ni, Mn, As, Cu, Sb, Pb, Cd, Zn, and Sn in flue gas, fly ash, and bottom ash were studied in a drop-tube furnace. To simulate combustion conditions in suspension-firing boilers, experiments were carried out at temperatures ranging from 1100 to 1400 °C, with sludge amounts ranging from 0% to 10% by weight. The results show that the 10 selected heavy metals could be divided into three distinct classes according to bottom ash mass percentage, except for Sn, which showed an irregularity. Class I included Cr, Ni, Mn, and As and were identified as less volatile heavy metals because more than 95% was retained in the bottom ash; these heavy metals exhibit high-temperature stability. Class II contained Cu, Sb, Pb, and Cd and were identified as semivolatile heavy metals; nearly 20–40% was distributed among flue gas and fly ash. In addition, the bottom ash heavy metal percentage decreased markedly with increasing temperature. Zn belongs to class III and was identified as a volatile heavy metal; less than 20% was retained in bottom ash under all experimental conditions. Thermodynamic equilibrium calculations were used to forecast heavy metal compounds, and most calculation results were consistent with the actual outcomes. X-ray diffraction results indicated that Cr and Ni mainly reacted with MgO and Fe2O3 to form MgCr2O4 and NiFeO4 in solid phase during the co-combustion process. The heavy metal emissions in flue gas meet the national standard, while the bottom ash leaching results indicate that the bottom ash from bituminous coal and pickling sludge co-combustion cannot be disposed of as common waste through landfill disposal without further treatment.

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Trace element partitioning in ashes from boilers firing pure wood or mixtures of solid waste with respect to fuel composition, chlorine content and temperature

Saqib

Bäckström

2014

Waste Management

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Partitioning of heavy metals during municipal solid waste incineration on a laboratory fluid bed furnace

Cited by 5 publications

References 5 publications

Comprehensive Evaluation of the Control Efficiency of Heavy-Metal Emissions during Two-Step Thermal Treatment of Sewage Sludge

Comprehensive Evaluation of the Control Efficiency of Heavy-Metal Emissions during Two-Step Thermal Treatment of Sewage Sludge

Co-combustion of Bituminous Coal and Pickling Sludge in a Drop-Tube Furnace: Thermodynamic Study and Experimental Data on the Distribution of Cr, Ni, Mn, As, Cu, Sb, Pb, Cd, Zn, and Sn

Trace element partitioning in ashes from boilers firing pure wood or mixtures of solid waste with respect to fuel composition, chlorine content and temperature

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