Shanghai Key Laboratory of Atmospheric Particle Pollution and Prevention (LAP3), Department of Environmental Science and Engineering, Fudan University, Shanghai, 200433, China.
Shanghai Technical Service Platform for Pollution Control and Resource Utilization of Organic Wastes, Shanghai, 200438, China.
Bull Environ Contam Toxicol. 2021 Jan;106(1):198-204. doi: 10.1007/s00128-020-03050-1. Epub 2020 Nov 17.
Pyrolysis is a promising technology for the disposal of sewage sludge. In this study, FeCl was selected as an additive for sludge pyrolysis. The results indicated that the FeCl-addition strategy not only enhanced carbon retention but also enhanced the nitrogen retention of sludge-based biochar. The best enhancement effect both occurred at 500°C, and the enhanced amount reached 29.7 mg C/g sludge and 1.33 mg N/g sludge, respectively. This enhancement may be attributed to the physical isolation provided by newly formed metallic complexes or oxides. Besides, the added FeCl improved the polarity and aromaticity of modified biochar by retaining more oxygen-containing functional groups, and could also catalyze the decomposition of tar, resulting in the release of more small molecular substances. The quantitative estimation of carbon and nitrogen retention in provinces of China found that the enhancement in coastal provinces was significantly preceded that of inland provinces.
热解是一种有前途的处理污水污泥的技术。在这项研究中，选择 FeCl 作为污泥热解的添加剂。结果表明，FeCl 添加策略不仅增强了碳的保留，而且增强了基于污泥的生物炭的氮保留。最佳增强效果均发生在 500°C，增强量分别达到 29.7mg C/g 污泥和 1.33mg N/g 污泥。这种增强可能归因于新形成的金属配合物或氧化物提供的物理隔离。此外，添加的 FeCl 通过保留更多含氧官能团来提高改性生物炭的极性和芳香性，并可以催化焦油的分解，从而释放更多的小分子物质。对中国各省碳和氮保留的定量估计发现，沿海省份的增强明显先于内陆省份。
