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.
污泥热水解中有机物转化及制备生物质塑料的潜力
- Title:
- Conversion of Organic Matters during Thermal Hydrolysis of Sludge and Potential for Preparation of Biomass?based Plastics
- Keywords:
- sludge; resource utilization; thermal hydrolysis; plastics; protein; polysaccharide
- 摘要:
- 研究了污泥溶出有机物在热水解环境中的转化情况，并分析了溶出有机物制备生物质塑料的潜力。结果表明，污泥热水解过程中溶出的有机物分别以溶解态、沉淀态和吸附态形式存在。当热水解温度达到100 ℃时，液相中出现类腐殖酸性有机物；热水解温度越高，溶出有机物的Zeta电位绝对值就越大。当污泥热水解温度增至180 ℃时，液相中有机物浓度升高，主要是因为高温会改变溶出有机物的结构，致使有机物的溶解性提高。温度最先使得液相中脂多糖的结构发生变化，然后脂多糖通过羰基与蛋白质结合成新的大分子有机物，在温度的作用下进一步发生结构变化并逐渐趋向于生成芳香族化合物。在甲基纤维素中添加污泥有机物一定程度上可以提升合成塑料的力学性能，弹性模量、拉伸屈服应力和拉伸强度最高可分别提升至（224.12±16.20） MPa（100 ℃）、（14.03±4.92） MPa（100 ℃）和（21.49±0.74） MPa（150 ℃）。
- 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.
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