Hubei Key Laboratory of Multi-media Pollution Cooperative Control in Yangtze Basin, School of Environmental Science and Engineering, Huazhong University of Science and Technology, Wuhan, 430074, PR China.
Hubei Key Laboratory of Multi-media Pollution Cooperative Control in Yangtze Basin, School of Environmental Science and Engineering, Huazhong University of Science and Technology, Wuhan, 430074, PR China.
J Environ Manage. 2024 Sep;367:122070. doi: 10.1016/j.jenvman.2024.122070. Epub 2024 Aug 3.
Fenton-conditioning is commonly used to improve dewatering ability for municipal biological sludge, however, its application in industries is scarce. In this study, biochar (FT-BC) was successfully synthesized from a Fenton-conditioned landfill leachate biological sludge under oxygen-limited. As compared to the corresponding blank and poly ferric-pretreated biochars (BC and PF-BC), moderate Fenton conditioning of the sludge could enable good removal performance for Cr (Ⅵ) by FT-BC. It was found that the oxygen central free radicals (OCFRs) on the biochar surface was intensively promoted due to Fenton electrophilic addition of ·OH onto the oxygen-containing functional groups in biomass. The amounts of OCFRs correlated positively well with the removal efficiency, indicating these persistent free radicals (PFRs)would mainly responsible for the reductive immobilization of Cr(VI)on the FT-BC surface. This study is expected to provide a new method for reclamation of industrial biological sludges with poor agglomeration by introducing simple Fenton pre-conditioning.
芬顿条件化通常用于改善城市生物污泥的脱水能力，但在工业中的应用很少。在本研究中，生物炭（FT-BC）是在有限氧条件下成功地从芬顿条件化的垃圾渗滤液生物污泥中合成的。与相应的空白和聚铁预处理生物炭（BC 和 PF-BC）相比，适度的污泥芬顿条件化可以使 FT-BC 对 Cr（Ⅵ）具有良好的去除性能。研究发现，由于·OH 在生物质含氧官能团上的芬顿亲电加成，生物炭表面的含氧自由基（OCFRs）得到了极大的促进。OCFRs 的数量与去除效率呈正相关，表明这些持久自由基（PFRs）主要负责在 FT-BC 表面上对 Cr(VI)的还原固定。本研究有望为通过引入简单的芬顿预处理来回收团聚性差的工业生物污泥提供一种新方法。
