Liu Shan, Chen Zhonglin, Shen Yang, Chen Hao, Li Zhenxin, Cai Liming, Yang Hanbin, Zhu Congshi, Shen Jimin, Kang Jing, Yan Pengwei
State Key Laboratory of Urban Water Resource and Environment, School of Environment, Harbin Institute of Technology, Harbin 50090, China.
State Key Laboratory of Urban Water Resource and Environment, School of Environment, Harbin Institute of Technology, Harbin 50090, China.
Water Res. 2024 Mar 1;251:121113. doi: 10.1016/j.watres.2024.121113. Epub 2024 Jan 6.
A novel treatment technique by coupling granular activated carbon (GAC) adsorption and ozone regeneration was constructed for long-lasting water decontamination. The GAC adsorption showed high performance for atrazine (ATZ) removal (99.9 %), and the ozone regeneration ensured the recyclability of GAC for water purification. The regeneration process was evaluated via several paths to assist the efficient adsorption process. Employing ozone micro-nano bubbles (O-MNBs) for regenerating GAC showed superior performance compared to traditional ozone. Meantime, inhibiting the formation of bromate (BrO). ATZ adsorption process suffered from the pore-filling, hydrogen bonding effect and π-π EDA interaction. The surface phenolic hydroxyl group, carboxyl group and pyridine nitrogen benefitted the triggering of ozone to generate reactive oxygen species, and regenerate the GAC surface. The superior performance of the adsorption and regeneration process was verified via a long-term running by a pilot study. It significantly improved the removal of organic micropollutants, UV and permanganate index. Additionally, the intermittent O-MNBs regeneration process resulted in efficient decontamination within the pores structure of GAC, which also effectively preserved the pore structure from destruction. For actual application, the cost of water production can be saved around 0.63 kWh m. This work proposed new ideas and theoretical support for economic water production.
构建了一种将颗粒活性炭（GAC）吸附与臭氧再生相结合的新型处理技术，用于持久的水净化。GAC吸附对阿特拉津（ATZ）的去除表现出高性能（99.9%），臭氧再生确保了GAC用于水净化的可回收性。通过多种途径评估再生过程以辅助高效吸附过程。与传统臭氧相比，采用臭氧微纳米气泡（O-MNBs）再生GAC表现出卓越性能。同时，抑制溴酸盐（BrO）的形成。ATZ吸附过程存在孔隙填充、氢键作用和π-π EDA相互作用。表面酚羟基、羧基和吡啶氮有利于引发臭氧产生活性氧物种，并使GAC表面再生。通过中试研究的长期运行验证了吸附和再生过程的卓越性能。它显著提高了有机微污染物、紫外线和高锰酸盐指数的去除率。此外，间歇性O-MNBs再生过程在GAC的孔隙结构内实现了高效去污，还有效保护了孔隙结构不被破坏。对于实际应用，可节省约0.63 kWh/m的产水成本。这项工作为经济产水提出了新的思路和理论支持。
