Guangdong Provincial Key Laboratory of Environmental Pollution Control and Remediation Technology, School of Environmental Science and Engineering, Sun Yat-sen University, Guangzhou 510006, China.
Guangdong Provincial Key Laboratory of Environmental Pollution Control and Remediation Technology, School of Environmental Science and Engineering, Sun Yat-sen University, Guangzhou 510006, China.
Waste Manag. 2019 Dec;100:171-181. doi: 10.1016/j.wasman.2019.09.018. Epub 2019 Sep 18.
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 CO 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 devolatilization/combustion 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.
为了提高污水污泥的燃料质量，选择水果和农业废物进行水热共碳化。水热共碳化后，有机物的保留得到了促进，而水热炭的 O/C 和 H/C 原子比则有了显著的提高。特别是，以 1:3（记为“SS:PS=1:3”）的质量比由污水污泥和花生壳进行水热共碳化得到的水热炭，显示出最高的燃料比 0.79，其碳含量增加到 50.0%，O/C 和 H/C 原子比显著降低。此外，水热炭的高位发热值通过水热共碳化提高了近 2.65 倍，达到 21.72MJ/kg。此外，当污水污泥和花生壳的混合比为 3:1 或 1:1 时，最有利的芳构化发生，而由于协同脱羧作用，水热共碳化在水热炭中产生的 CO 和 OH 比 COOH 多。水热共碳化得到的水热炭的零电荷点值相对较高，表明其疏水性得到改善。燃烧动力学结果表明，水热共碳化在挥发/燃烧阶段和炭燃烧过程中平衡了水热炭的活化能，使燃烧过程更稳定持久。水热炭“SS:PS=1:3”表现出了良好的燃烧性能。因此，水热共碳化可以实现有机固体废物的可持续利用，生成优质的水热炭固体生物燃料。
