College of Geographical Sciences, College of Carbon Neutral Future Technology, Fujian Normal University, Fuzhou 350007, China; Fujian College and University Engineering Research Center for Municipal Solid Waste Resourceization and Management, Fuzhou 350007, Fujian, China.
College of Environment and Resources, College of Carbon Neutral Modern Technology, Fujian Normal University, Pollution Control and Resource Recycling Laboratory of Fujian Province, Fuzhou 350007, China; Fujian College and University Engineering Research Center for Municipal Solid Waste Resourceization and Management, Fuzhou 350007, Fujian, China.
Sci Total Environ. 2024 Jan 1;906:167816. doi: 10.1016/j.scitotenv.2023.167816. Epub 2023 Oct 12.
This study explored the influence of pyrolysis temperatures on the properties of municipal sludge-based biochar (MSB) and evaluated the impact of MSB on humification and oxytetracycline (OTC, a broad-spectrum antibiotic) degradation in pig manure composting. Three types of MSB were produced from sewage sludge pyrolyzed at 300 °C, 500 °C, and 700 °C, respectively. Results indicated that pyrolysis temperature adjusted the formation sequence of the functional groups in MSB, and higher pyrolysis temperatures enriched the aromaticity of the biochar and augmented the concentrations of humic precursor compounds. The MSB addition to pig manure composting enhanced the peak temperature and prolonged the thermophilic phase. Moreover, the MSB addition significantly increased the HI (humic acid/fulvic acid) values (1.6-2.57) compared with the control (1.28), with a more pronounced effect observed at higher biochar pyrolysis temperatures. Furthermore, the MSB reduced the half-life of OTC degradation (1.47-2.44 d) during composting, accelerating its degradation compared with the control (2.66 d). The study demonstrated that the MSB provided a substantial amount of humic precursor materials into the composting process while also expediting the degradation of organic matter, thereby enhancing the humification process. Moreover, the extended duration of the thermophilic phase accelerated the degradation of OTC and shortened its half-life. Notably, the MSB at 700 °C had the best performance compared with other MSBs.
本研究探讨了热解温度对城市污泥基生物炭（MSB）性质的影响，并评估了 MSB 对猪粪堆肥腐殖化和土霉素（OTC，一种广谱抗生素）降解的影响。分别以 300°C、500°C 和 700°C 热解的污水污泥制备了三种 MSB。结果表明，热解温度调整了 MSB 中官能团的形成顺序，较高的热解温度丰富了生物炭的芳构度，并增加了腐殖质前体化合物的浓度。MSB 添加到猪粪堆肥中提高了峰值温度并延长了高温期。此外，MSB 添加显著增加了 HI（腐殖酸/富里酸）值（1.6-2.57），与对照（1.28）相比，较高的生物炭热解温度下效果更为明显。此外，MSB 缩短了堆肥过程中土霉素降解的半衰期（1.47-2.44 d），与对照（2.66 d）相比，加速了其降解。研究表明，MSB 为堆肥过程提供了大量的腐殖质前体物质，同时也加速了有机物的降解，从而促进了腐殖化过程。此外，高温期的延长加速了 OTC 的降解并缩短了其半衰期。值得注意的是，700°C 下的 MSB 与其他 MSB 相比性能最佳。
