YANGNing,ZHANGYan,LIUYing,et al.Conversion of Organic Matters during Thermal Hydrolysis of Sludge and Potential for Preparation of Biomass?based Plastics[J].China Water & Wastewater,2025,41(11):110-118.
Conversion of Organic Matters during Thermal Hydrolysis of Sludge and Potential for Preparation of Biomass?based Plastics
China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU]
volume:
第41卷
Number:
第11期
Page:
110-118
Column:
Date of publication:
2025-06-01
- Keywords:
- sludge; resource utilization; thermal hydrolysis; plastics; protein; polysaccharide
- Abstract:
- This study investigated the conversion of organic matters released during thermal hydrolysis of sludge and evaluated the potential for preparing biomass-based plastics using the dissolved organic matters. The organic matters released during the thermal hydrolysis of sludge existed in three distinct forms: dissolved, precipitated, and adsorbed states. When the thermal hydrolysis temperature reached 100 ℃, humic acid-like organic substances were observed in the liquid phase. Furthermore, as the thermal hydrolysis temperature increased, the absolute value of Zeta potential of the dissolved organic substances also increased. When the thermal hydrolysis temperature of sludge increased to 180 ℃, the concentration of organic matters in the liquid phase rose. This was primarily due to the fact that high temperatures altered the structure of dissolved organic matters, thereby enhancing its solubility. Temperature initially induced structural alterations in lipopolysaccharides within the liquid phase. Subsequently, lipopolysaccharides interacted with proteins via carbonyl groups, leading to the formation of new macromolecular organic compounds. Under the influence of temperature, additional structural transformations occurred, progressively favoring the generation of aromatic compounds. The incorporation of sludge organic matters into methylcellulose enhanced the mechanical properties of synthetic plastics to a certain extent. Specifically, the elastic modulus, tensile yield stress, and tensile strength increased to the maximum of (224.12±16.20) MPa at 100 ℃, (14.03±4.92) MPa at 100 ℃, and (21.49±0.74) MPa at 150 ℃, respectively.
Last Update:
2025-06-01