Piai Laura, van der Wal Albert, Boelee Nadine, Langenhoff Alette
Environmental Technology, Wageningen University & Research, P.O. Box 17, 6700 AA Wageningen, The Netherlands.
Environmental Technology, Wageningen University & Research, P.O. Box 17, 6700 AA Wageningen, The Netherlands; Evides Water Company, PO Box 4472, 3006 AL Rotterdam, The Netherlands.
J Hazard Mater. 2021 Jul 15;414:125503. doi: 10.1016/j.jhazmat.2021.125503. Epub 2021 Feb 24.
The industrial chemical melamine is often detected in surface water used for drinking water production, due to its wide application and insufficient removal in conventional wastewater treatment plants. Melamine can be removed from water by adsorption onto granular activated carbon (GAC), nevertheless, GAC needs periodic reactivation in costly and energy intense processes. As an alternative method, GAC can also be regenerated using biomass capable of degrading melamine in a process called bioregeneration. We assessed melamine biodegradation in batch experiments in fully oxic and anoxic, as well as in alternating oxic and anoxic conditions. Additionally, we studied the effect of an additional carbon source on the biodegradation. The most favourable conditions for melamine biodegradation were applied to bioregenerate GAC loaded with melamine. We demonstrate that melamine can be biodegraded in either oxic or anoxic conditions and that melamine degrading biomass can restore at least 28% of the original GAC adsorption capacity. Furthermore, our results indicate that bioregeneration occurs mainly in the largest pore fraction of GAC, impacting adsorption kinetics. Overall, we show that bioregeneration has a large potential for restoring GAC adsorption capacity in industrial wastewater.
由于工业化学品三聚氰胺应用广泛且在传统污水处理厂中去除不充分，其常在用于饮用水生产的地表水中被检测到。三聚氰胺可通过吸附到颗粒活性炭（GAC）上从水中去除，然而，GAC需要在成本高昂且能耗大的过程中定期再活化。作为一种替代方法，GAC也可在一个称为生物再生的过程中使用能够降解三聚氰胺的生物质进行再生。我们在完全好氧和厌氧以及交替好氧和厌氧条件下的批次实验中评估了三聚氰胺的生物降解。此外，我们研究了额外碳源对生物降解的影响。将三聚氰胺生物降解的最有利条件应用于对负载三聚氰胺的GAC进行生物再生。我们证明三聚氰胺可在好氧或厌氧条件下被生物降解，且降解三聚氰胺的生物质可恢复至少28%的原始GAC吸附容量。此外，我们的结果表明生物再生主要发生在GAC的最大孔隙部分，影响吸附动力学。总体而言，我们表明生物再生在恢复工业废水中GAC吸附容量方面具有很大潜力。
