Study on Influencing Factors of Hydrothermal Carbonization of Sewage Sludge

被引：1

作者：

Wang, Hang ^{[1
]}

Liu, Yangsheng ^{[2
]}

Wang, Dianchang ^{[1
]}

Chen, Xiang ^{[1
]}

Liu, Feng ^{[1
]}

Qiao, Xueyuan ^{[1
]}

Li, Kun ^{[1
]}

Wang, Xiankai ^{[1
]}

机构：

[1] China Three Gorges Corporation, Beijing

[2] College of Environmental Sciences and Engineering, Peking University, Beijing

来源：

Beijing Daxue Xuebao (Ziran Kexue Ban)/Acta Scientiarum Naturalium Universitatis Pekinensis | 2024年 / 60卷 / 04期

关键词：

hydrochar; hydrothermal carbonization (HTC); sewage sludge; sludge treatment;

D O I：

10.13209/j.0479-8023.2024.043

中图分类号：

学科分类号：

摘要：

The effects of reaction temperature, time, and medium on the properties of sludge hydrochar were experimentally studied. The results demonstrated that hydrothermal carbonization (HTC) treatment enhanced sludge dewatering and volume reduction, with a higher water removal rate (42.8%–53.3%) observed under acidic conditions compared to neutral conditions (28.9%–45.2%). Notably, the highest dehydration rate was achieved after HTC at 240°C for 1 hour. Increased reaction temperatures and longer reaction times led to reduced hydrochar yield due to enhanced dehydration and decarboxylation reactions. The H/C and O/C atomic ratios gradually decreased as a result. Furthermore, the regular and compact structure of sludge was disrupted to varying degrees following HTC treatment, resulting in the formation of holes and grooves that increased the specific surface area, pore volume, and pore size of the hydrochar produced. Specifically, hydrochar obtained from HTC at 220°C for 1 hour exhibited the highest specific surface area (129.98 m2/g) and pore volume (0.66 cm3/g). The composition and crystalline structure of hydrochar were primarily influenced by factors such as reaction medium > reaction temperature > reaction time. With the increase of HTC reaction temperature and residence time, the volatile content of hydrochar decreased while the fixed carbon and ash content increased. The main exothermic range during combustion of hydrochar occured between 250–550°C. © 2024 Peking University. All rights reserved.

引用

页码：745 / 757

页数：12

共 14 条

[1]

Huang R, Fang C, Zhang B, Et al., Transformations of phosphorus speciation during (hydro)thermal treatments of animal manures, Environ Sci Technol, 52, 5, pp. 3016-3026, (2018)

[2]

Alvarez J, Lopez G, Amutio M, Et al., Preparation of adsorbents from sewage sludge pyrolytic char by carbon dioxide activation, Process Saf Environ, 103, pp. 76-86, (2016)

[3]

Mendez A, Gasco G, Freitas M M A, Et al., Preparation of carbon-based adsorbents from pyrolysis and air activation of sewage sludges, Chem Eng J, 108, pp. 169-177, (2005)

[4]

Monsalvo V M, Mohedano A F, Rodriguez J J., Activated carbons from sewage sludge application to aqueous-phase adsorption of 4-chlorophenol, Desalination, 277, pp. 377-382, (2011)

[5]

Gasco G, Paz-Ferreiro J, Mendez A., Thermal analysis of soil amended with sewage sludge and biochar from sewage sludge pyrolysis, J Therm Anal Calorim, 108, 2, pp. 769-775, (2012)

[6]

Hossain M K, Strezov V, Nelson P F., Comparative assessment of the effect of wastewater sludge biochar on growth, yield and metal bioaccumulation of cherry tomato, Pedosphere, 25, 5, pp. 680-685, (2015)

[7]

Wang T, Zhai Y, Zhu Y, Et al., Evaluation of the clean characteristics and combustion behavior of hydrochar derived from food waste towards solid biofuel production, Bioresource Technol, 266, pp. 275-283, (2018)

[8]

Huang H, Yuan X., The migration and transformation behaviors of heavy metals during the hydrothermal treatment of sewage sludge, Bioresource Technol, 200, pp. 991-998, (2016)

[9]

Funke A, Ziegler F., Hydrothermal carbonization of biomass: a summary and discussion of chemical mechanisms for process engineering, Biofuels, Bioproducts and Biorefining, 4, 2, pp. 160-177, (2010)

[10]

Puccini M, Ceccarini L, Antichi D, Et al., Hydrothermal carbonization of municipal woody and herbaceous prunings: hydrochar valorisation as soil amendment and growth medium for horticulture, Sustainability-Basel, 10, 3, (2018)

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