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Effect of the Amount of Sludge on Physicochemical Properties and Chemical Structure of Low‐rank Coal under Hydrothermal Conditions
Author(s) -
Liu Meng,
Cardoso Aderlanio,
Zhao Liang,
Duan Yufeng
Publication year - 2017
Publication title -
asia‐pacific journal of chemical engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.348
H-Index - 35
eISSN - 1932-2143
pISSN - 1932-2135
DOI - 10.1002/apj.2115
Subject(s) - sewage sludge , coal , chemistry , heat of combustion , hydrogen , carbon fibers , organic matter , yield (engineering) , pulp and paper industry , sewage treatment , waste management , environmental chemistry , combustion , organic chemistry , materials science , metallurgy , composite number , engineering , composite material
Abstract Sewage sludge mixed with Yunnan low‐rank coal was treated by hydrothermal treatment (HT) at mild temperature and high‐pressure conditions. The fuel characteristics and chemical structure of HT solid products were investigated to explore the synergistic effects between low‐rank coal and sludge. The results indicated that the fuel properties of HT solid products were negatively influenced as the amount of sludge increased, but there were synergistic positive effects on the content of volatile matter, fixed carbon, oxygen, and calorific value when the amount of sludge was more than 30 wt% in the HT at 300 °C. More hydrogen groups in sludge were involved in the hydrogen transfer reactions between the low‐rank coal and sludge, which promoted the occurrence of synergistic effects during the HT process. CO 2 and H 2 were the main gas products, but the yield of both gases produced by the HT of sewage sludge was significantly higher than that of low‐rank coal. The aromaticity of HT solid products reduced from 60.65% to 51.83%, and the aliphaticity increased from 39.35% to 48.17% when the amount of sludge increased from 10 to 70 wt%. © 2017 Curtin University of Technology and John Wiley & Sons, Ltd.