School of Environment and Architecture, University of Shanghai for Science and Technology, Shanghai, China.
State Key Laboratory of Pollution Control and Resources Reuse, College of Environmental Science and Engineering, Tongji University, Shanghai, China.
Water Environ Res. 2024 Mar;96(3):e10998. doi: 10.1002/wer.10998.
The excessive discharge of phosphorus from rural domestic sewage is a problem that worthy of attention. If the phosphorus in the sewage were recovered, addressing this issue could significantly contribute to mitigating the global phosphorus crisis. In this study, corn straw, a common agricultural waste, was co-pyrolytically modified with eggshells, a type of food waste from university cafeterias. The resulting product, referred to as corn straw eggshell biochar (EGBC) was characterized using SEM, XRD, XPS, XRF, and other methods. Batch adsorption experiments were conducted to determine the optimal preparation conditions of EGBC and to explore its adsorption characteristics. EGBC showed strong adsorption effectiveness within a pH range of 5-12. The adsorption isotherm closely followed the Sips model (R > 0.9011), and the adsorption kinetics were more consistent with the pseudo-second-order model (R > 0.9899). The process was found to be both spontaneous and endothermic. Under optimal conditions, the phosphorus adsorption capacity of EGBC was measured to be 288.83 mg/g. This demonstrates the high efficiency of EGBC for phosphorus removal and illustrates an effective method of utilizing food waste for environmental remediation. PRACTITIONER POINTS: Biochar prepared from waste eggshell was used to removal and recovery phosphorus in wastewater treatment. EGBC has an impressive adsorption capacity that can reach up to 288.83 mg/g. EGBC has excellent adsorption and filtration capabilities, and there is a sudden increase in concentration at 900 min in the breakthrough curve of EGBC. EGBC has good regeneration performance, with an adsorption effect of 65% and an adsorption capacity of 121 mg/g after four desorption and regeneration cycles.
农村生活污水磷的过量排放是一个值得关注的问题。如果能回收污水中的磷，将对缓解全球磷危机起到重要作用。本研究以玉米秸秆为原料，与大学食堂的厨余垃圾之一蛋壳共热解，制备了玉米秸秆蛋壳生物炭（EGBC）。采用 SEM、XRD、XPS、XRF 等方法对 EGBC 进行了表征。通过批量吸附实验，确定了 EGBC 的最佳制备条件，并探讨了其吸附特性。结果表明，EGBC 在 pH 值为 5-12 的范围内具有较强的吸附效果。吸附等温线更符合 Sips 模型（R>0.9011），吸附动力学更符合准二级模型（R>0.9899）。该过程是自发的和吸热的。在最佳条件下，EGBC 的磷吸附容量为 288.83 mg/g。这表明 EGBC 具有高效去除磷的能力，为利用厨余垃圾进行环境修复提供了一种有效的方法。
利用废弃蛋壳制备生物炭，用于去除和回收废水中的磷。EGBC 具有高达 288.83 mg/g 的惊人吸附容量。EGBC 具有良好的吸附和过滤性能，在 EGBC 的穿透曲线中，浓度在 900 min 时会突然增加。EGBC 具有良好的再生性能，经过四次脱附和再生循环后，吸附效果为 65%，吸附容量为 121 mg/g。
