Synergistic effect of hydrothermal co-carbonization of sewage sludge with fruit and agricultural wastes on hydrochar fuel quality and combustion behavior

被引:125
作者
He, Chao [1 ]
Zhang, Zhao [1 ]
Ge, Chaofeng [1 ]
Liu, Wen [2 ]
Tang, Yetao [1 ]
Zhuang, Xiuzheng [3 ]
Qiu, Rongliang [1 ]
机构
[1] Sun Yat Sen Univ, Sch Environm Sci & Engn, Guangdong Prov Key Lab Environm Pollut Control &, Guangzhou 510006, Guangdong, Peoples R China
[2] Nanyang Technol Univ, Sch Chem & Biomed Engn, 62 Nanyang Dr, Singapore 637459, Singapore
[3] Chinese Acad Sci, Guangzhou Inst Energy Convers, Guangdong Key Lab New & Renewable Energy Res & De, Key Lab Renewable Energy, Guangzhou 510640, Guangdong, Peoples R China
基金
国家重点研发计划; 中国国家自然科学基金;
关键词
Biomass upgrading; Synergistic effect; Energy recovery; Surface functional groups; Combustion behavior; REACTION PATHWAY; CARBONIZATION; BIOMASS; PYROLYSIS; GASIFICATION; CONVERSION; CELLULOSE; CARBON; LIQUEFACTION; TEMPERATURE;
D O I
10.1016/j.wasman.2019.09.018
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
In order to improve fuel quality of sewage sludge, fruit and agricultural wastes have been selected for hydrothermal co-carbonization. After hydrothermal co-carbonization, organics retention was facilitated, while O/C and H/C atomic ratios of hydrochars were substantially upgraded. Particularly, hydrochar from hydrothermal co-carbonization of sewage sludge with peanut shells at mass ratio of 1:3 (denoted as "SS: PS = 1:3") showed the highest fuel ratio of 0.79 and its carbon content was increased to 50.0% with significantly decreased O/C and H/C atomic ratios. Furthermore, higher heating value of hydrochars from hydrothermal co-carbonization was increased by nearly 2.65-fold and reached 21.72 MJ/kg. Moreover, the most favorable aromatization occurred when sewage sludge and peanut shells blending ratio was 3:1 or 1:1, whereas hydrothermal co-carbonization induced more -C=O and -OH than -COOH in hydrochars due to synergistic decarboxylation. A relatively higher value of point of zero charge for hydrochars from hydrothermal co-carbonization implied improved hydrophobicity. Combustion kinetics results indicated that hydrothermal co-carbonization balanced activation energies of hydrochars in devolatilizationicombustion stage and char combustion process, rendering a more stable and lasting combustion profile. Hydrochars "SS:PS = 1:3" demonstrated desirable combustion performance. Therefore, hydrothermal co-carbonization can realize sustainable utilization of organic solid wastes towards superior hydrochar solid biofuels. (C) 2019 Elsevier Ltd. All rights reserved.
引用
收藏
页码:171 / 181
页数:11
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