State Key Laboratory of Urban Water Resource and Environment, School of Municipal and Environmental Engineering, Harbin Institute of Technology, Harbin 150090, PR China.
Department of Chemical Engineering, National Cheng Kung University, Tainan, Taiwan; Department of Chemical Engineering, National Taiwan University, Taipei, Taiwan.
Bioresour Technol. 2017 Dec;246:142-149. doi: 10.1016/j.biortech.2017.08.025. Epub 2017 Aug 7.
The properties of biochar derived from waste activated sludge and anaerobic digestion sludge under pyrolysis temperature varying from 400°C to 800°C were investigated. The heavy metals adsorption efficiency of the sludge-derived biochar was also examined. Among the biochar samples tested, ADSBC600 possessing highly porous structure, special surface chemical behaviors and high thermal stability was found to remove Pb from aqueous solutions efficiently with an adsorption capacity of 51.20mg/g. The Pb adsorption kinetics and isotherm for ADSBC600 can be described using the pseudo second-order model and Langmuir isotherm, respectively. Analysis of the characteristics of biochar before and after metal treatment suggests that electrostatic attraction, precipitation, surface complexation and ion exchange are the possible Pb removal mechanisms. This study demonstrates a successful example of waste refinery by converting anaerobic digestion sludge to feasible heavy metal adsorbents to implement the concept of circular economy.
研究了在热解温度从 400°C 到 800°C 变化的情况下，由废活性污泥和厌氧消化污泥衍生的生物炭的特性。还研究了污泥衍生生物炭的重金属吸附效率。在所测试的生物炭样品中，发现 ADSBC600 具有高度多孔结构、特殊表面化学行为和高热稳定性，能够有效地从水溶液中去除 Pb，吸附容量为 51.20mg/g。ADSBC600 的 Pb 吸附动力学和等温线可以分别用准二级模型和朗缪尔等温线来描述。对金属处理前后生物炭特性的分析表明，静电吸引、沉淀、表面络合和离子交换是可能的 Pb 去除机制。本研究通过将厌氧消化污泥转化为可行的重金属吸附剂，成功地实现了废物精炼，实现了循环经济的理念。
