Effect of inherent minerals on sewage sludge pyrolysis: Product characteristics, kinetics and thermodynamics

Tang, Siqi1; Zheng, Chunmiao1,2; Zhang, Zuotai2,3

2018-10

10.1016/j.wasman.2018.09.012

WASTE MANAGEMENT   影响因子和分区

0956-053X

Inherent minerals in sludge influence sludge pyrolysis behaviors and the final products. In this study, the effects of inherent minerals on sewage sludge pyrolysis were systematically investigated by studying the pyrolysis behaviors of raw sewage sludge (RS) and HC1-washed sludge (WS), and in combination with thermodynamic equilibrium simulations for the hypothetical mineral-free sludge (AS) assumed. The pyrolysis of RS and WS was performed with a novel online thermogravimetric analyzer equipped with an infrared spectrometer and a gas chromatograph coupled with a mass spectrometer (TG-IR-GC/MS). It was found that inherent minerals influenced both the release of volatile products as a function of pyrolysis temperature, and the development of the physicochemical properties of the derived char. In the temperature range of 300-500 degrees C, hydrocarbons with more than 4 carbon atoms as well as aromatic compounds showed an increased release during WS pyrolysis, with respect to RS, while hydrocarbons with less than 3 carbon atoms such as CH4 and C3H6 exhibited a decreased release. In addition, the inherent minerals enhanced the release of HCN and NH3, both leading to increased NO2 release, and the release of H2S and COS was also promoted while the release of CH3SH, SO2 and CS2 was mitigated. Kinetic analysis confirmed that a catalytic effect induced by the inherent minerals decreased the activation energy at 300-500 degrees C. Thermodynamic simulations suggested that inherent minerals influenced sludge pyrolysis and the derived products formation by increasing the total Gibbs energy of the sludge pyrolysis system. Therefore, considerations of sludge inherent minerals should be taken into account during pyrolysis for the purpose of value-added commodity production and pollutant mitigation. (C) 2018 Elsevier Ltd. All rights reserved.

Sewage sludge pyrolysis Inherent minerals Products distribution Pyrolysis kinetics Gibbs free energy minimization

SCI ; EI

英语

通讯

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

Engineering ; Environmental Sciences & Ecology

Engineering, Environmental ; Environmental Sciences

WOS:000452946200019

PERGAMON-ELSEVIER SCIENCE LTD

20183805826146

Activation analysis ; Activation energy ; Ammonia ; Aromatic hydrocarbons ; Atoms ; Carbon ; Free energy ; Gibbs free energy ; Kinetics ; Minerals ; Sewage sludge ; Spectrometers

Sewage Treatment:452.2 ; Minerals:482.2 ; Thermodynamics:641.1 ; Optical Devices and Systems:741.3 ; Chemical Reactions:802.2 ; Chemical Products Generally:804 ; Classical Physics; Quantum Theory; Relativity:931 ; Atomic and Molecular Physics:931.3

ENGINEERING

Web of Science

1.Peking Univ, Coll Engn, Dept Energy & Resources Engn, Beijing 100871, Peoples R China
2.Southern Univ Sci & Technol, Sch Environm Sci & Engn, Shenzhen 518055, Peoples R China
3.Key Lab Municipal Solid Waste Recycling Technol &, Shenzhen 518055, Peoples R China

Tang, Siqi,Zheng, Chunmiao,Zhang, Zuotai. Effect of inherent minerals on sewage sludge pyrolysis: Product characteristics, kinetics and thermodynamics[J]. WASTE MANAGEMENT,2018,80:175-185.

Tang, Siqi,Zheng, Chunmiao,&Zhang, Zuotai.(2018).Effect of inherent minerals on sewage sludge pyrolysis: Product characteristics, kinetics and thermodynamics.WASTE MANAGEMENT,80,175-185.

Tang, Siqi,et al."Effect of inherent minerals on sewage sludge pyrolysis: Product characteristics, kinetics and thermodynamics".WASTE MANAGEMENT 80(2018):175-185.