Journal
ENERGY
Volume 153, Issue -, Pages 921-932Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.energy.2018.04.108
Keywords
Alkaline earth metals; Sewage sludge pyrolysis; TG-FTIR-MS; Volatile products; Kinetics
Categories
Funding
- National Science Fund for Distinguished Young Scholars [51522401]
- National Natural Science Foundation of China [51472007, 51772141]
- Shenzhen Science and Technology Innovation Committee [ZDSYS201602261932201, JCYJ20170412154335393, KQTD2016022619584022]
- Southern University of Science and Technology [G01296001]
- Guangdong Provincial Key Laboratory of Soil and Groundwater Pollution Control [2017B030301012]
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Alkaline earth metals (AEMs) aggregated in sludge minerals influence the pyrolysis characteristics and product distribution. Sewage sludge pyrolysis behaviors driven by AEMs were first investigated using advanced thermogravimetry sequentially combined with Fourier transform infrared spectroscopy and mass spectrometry (TG-FTIR-MS). The AEMs represented by MgO and CaO affected the release of volatile products in different ways during sludge pyrolysis. Over 440 degrees C, CaO and MgO additions both enhanced total absorbance of pyrolytic volatiles, while the enhancement coming from CaO was stronger. Both additions reduced the release order of alkanes and olefins by varying degrees. The degree of reduction with MgO was more significant than that with CaO, while CaO addition promoted the release of CH4, C4H8 and C5H10 over 490 degrees C with respect to MgO. The addition of MgO more severely suppressed the release of pollutants including NH3, HCN, NO2, H2S, CH3SH, COS, SO2 and nitrogen-derived aromatics than that of CaO. The catalytic effect induced by both species was evidenced by the related pyrolysis kinetics. The attained results revealed that AEM-containing minerals are promising candidates for pollution control during sludge pyrolysis for value-added products recovery. (C) 2018 Elsevier Ltd. All rights reserved.
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