Distributional and compositional insight into the polluting materials during sludge combustion: Roles of ash

Sun, Yongqi1,2; Chen, Jingjing1,3; Zhang, Zuotai1,3

2018-05-15

10.1016/j.fuel.2018.01.142

FUEL   影响因子和分区

0016-2361

1873-7153

Here we systemically elucidated the compositions and distributions of polluting materials during sludge combustion using both experimental and theoretical methods where the roles of ash were clarified in a category within aluminosilicate system. With regard to the polluting gases, an increasing temperature increased the SO2 release in replace of SO3 and sulfates while continuously enhanced the formation of NO and NO2. Comparatively, an increasing input oxygen amount had limited effect on S-bearing gases whilst continuously increased the NOx release. Additionally, the ash had a sulfur fixation effect through inducing the transformation from oxides to sulfates. The trace elements were overall categorized into four types based on their volatilities and the distributions and mineral phases of them were then clarified in detail. It was proved that with increasing temperature, they were increasingly distributed in gaseous state with ash providing a fixation effect. Moreover, 5 kinds of decomposition reactions related to polluting materials, namely sulfates, oxides, arsenates, silicates and hydroxides, were deeply analyzed from a respect of Gibbs energy where their stabilities and roles of ash were identified. Furthermore, the sludge combustion was experimentally clarified using a TG-MS system and here we defined a new parameter, namely peak index, to characterize the releases of polluting gases. This not only deepened the understanding of sludge combustion experimentally but also partially validated the theoretical analysis in quantity. Most importantly, the present study contributed to establishing a foundation for controlling and mitigating the environmental impacts of polluting materials toward efficient and clean sludge combustions.

Sludge combustion Polluting gas Trace element Distribution Mineral phase

SCI ; EI

英语

第一 ; 通讯

Guangdong Provincial Key Laboratory of Soil and Groundwater Pollution Control[2017B030301012]

Energy & Fuels ; Engineering

Energy & Fuels ; Engineering, Chemical

WOS:000429419600034

ELSEVIER SCI LTD

20180704787706

Environmental impact ; Nitrogen oxides ; Silicates ; Sulfur compounds ; Temperature ; Trace elements

Environmental Impact and Protection:454.2 ; Thermodynamics:641.1 ; Inorganic Compounds:804.2

ENGINEERING

Web of Science

1.Southern Univ Sci & Technol, Sch Environm Sci & Engn, Shenzhen 518055, Peoples R China
2.Univ Queensland, Sch Chem Engn, St Lucia, Qld 4072, Australia
3.Key Lab Municipal Solid Waste Recycling Technol &, Shenzhen 518055, Peoples R China

Sun, Yongqi,Chen, Jingjing,Zhang, Zuotai. Distributional and compositional insight into the polluting materials during sludge combustion: Roles of ash[J]. FUEL,2018,220:318-329.

Sun, Yongqi,Chen, Jingjing,&Zhang, Zuotai.(2018).Distributional and compositional insight into the polluting materials during sludge combustion: Roles of ash.FUEL,220,318-329.

Sun, Yongqi,et al."Distributional and compositional insight into the polluting materials during sludge combustion: Roles of ash".FUEL 220(2018):318-329.