College of Environmental Science and Engineering, Hunan University, Changsha 410082, P.R. China; Key Laboratory of Environmental Biology and Pollution Control (Hunan University), Ministry of Education, Changsha 410082, P.R. China; Department of Civil and Earth Resources Engineering, Kyoto University, Kyoto 612-8236, Japan.
College of Environmental Science and Engineering, Hunan University, Changsha 410082, P.R. China; Key Laboratory of Environmental Biology and Pollution Control (Hunan University), Ministry of Education, Changsha 410082, P.R. China.
Bioresour Technol. 2024 Jun;402:130803. doi: 10.1016/j.biortech.2024.130803. Epub 2024 May 10.
An ionic liquid (IL, [DMAPA]HSO) was prepared to facilitate the removal of heavy metals by hydrothermal carbonization (HTC) in sewage sludge (SS) and to obtain a positive energy recovery (ER, (Energy/Energy - 1) > 0). The results found that the removal efficiencies of the Fe, Mn, Zn, Co, and Cd from SS exceeded 75 % with positive ER (6 %) at 20 wt% IL dosage (IL:SS). IL promoted the HTC reactions of proteins and polysaccharides to produce fixed carbon and small molecule polymers. The process mainly relies on IL to catalyze the dehydration and graphitization of SS and to destroy the heavy metal binding sites such as carboxyl and hydroxyl groups. Additionally, IL aids in constructing the macropore structures in hydrochar, thereby facilitating the release of heavy metals and water during the HTC process. This discovery holds promise for removing heavy metals from SS by one-pot HTC processes with positive energy recovery.
离子液体 (IL，[DMAPA]HSO) 被制备用于通过水热碳化 (HTC) 在污水污泥 (SS) 中促进重金属的去除，并获得正能量回收 (ER，(Energy/Energy - 1) > 0)。结果发现，在 20wt%IL 用量 (IL:SS) 下，IL 促进了蛋白质和多糖的 HTC 反应，生成固定碳和小分子聚合物，Fe、Mn、Zn、Co 和 Cd 从 SS 中的去除效率超过 75%，具有正 ER (6%)。IL 主要通过催化 SS 的脱水和石墨化以及破坏羧基和羟基等重金属结合位点来促进 HTC 反应。此外，IL 有助于构建水热炭中的大孔结构，从而促进 HTC 过程中重金属和水的释放。这一发现有望通过一锅 HTC 工艺，用正能量回收从 SS 中去除重金属。
