School of Energy and Power Engineering, Shandong University, Jinan 250061, China; National Engineering Laboratory for Reducing Emissions from Coal Combustion, Jinan 250061, China.
School of Energy and Power Engineering, Shandong University, Jinan 250061, China; National Engineering Laboratory for Reducing Emissions from Coal Combustion, Jinan 250061, China.
Sci Total Environ. 2022 Jan 15;804:149951. doi: 10.1016/j.scitotenv.2021.149951. Epub 2021 Aug 27.
Cabbage waste (CW) was recycled for generating some potential high-value products by a multi-stage treatment technology. A novel multi-stage utilization process was successfully proposed which consisted of low-temperature extraction, medium-temperature thermolysis, and high-temperature activation. Plant extracts that contain fatty acids, alcohol, furan, and esters were first extracted from raw cabbage waste by ethanol at 70 °C. Pyrolytic oil was obtained by cabbage waste pyrolysis at different medium temperature conditions. The produced carbon residue was further activated at high temperature for environmental purification such as VOCs removal. The performance of this process was characterized by N isothermal adsorption, Fourier transform infrared spectrometer (FTIR), thermogravimetric analysis (TG) and gas chromatography-mass spectrometry (GC-MS). Experimental results showed that the optimum temperatures for extraction, pyrolysis, and activation were 70 °C, 520 °C and 700 °C, respectively. Phenolic-rich pyrolysis solution with 50% phenolic contents could be obtained with the potential application of botanical pesticide. The produced biochar had a BET surface area of as high as 891.12 m/g. The yields of biochar, pyrolytic liquid, and pyrolytic gas were 43.86%, 17.47%, 38.67%, respectively, and the process energy efficiency was over 42.7%. Applicability and feasibility of this process were also discussed in the aspects of energy quality balance, economy, and environment. The proposed multi-stage thermal-chemical process could be used as a full recycling method for biomass waste.
白菜废弃物（CW）通过多阶段处理技术被回收利用，以生成一些有潜在价值的产品。成功提出了一种新型的多阶段利用工艺，该工艺由低温提取、中温热解和高温活化组成。首先，通过 70°C 的乙醇从原料白菜废弃物中提取出含有脂肪酸、醇、呋喃和酯的植物提取物。在不同的中温条件下对白菜废弃物进行热解，得到热解油。产生的碳残渣在高温下进一步活化，用于去除挥发性有机化合物等环境净化。该过程的性能通过 N 等温吸附、傅里叶变换红外光谱（FTIR）、热重分析（TG）和气相色谱-质谱联用（GC-MS）进行了表征。实验结果表明，提取、热解和活化的最佳温度分别为 70°C、520°C 和 700°C。可获得具有 50%酚含量的富含酚类的热解溶液，具有植物农药的潜在应用价值。所生产的生物炭的 BET 比表面积高达 891.12 m/g。生物炭、热解液和热解气的产率分别为 43.86%、17.47%和 38.67%，过程能量效率超过 42.7%。还从能源质量平衡、经济和环境等方面讨论了该过程的适用性和可行性。提出的多阶段热化学工艺可作为生物质废物的全回收方法。
