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Micro-nano bubble ozonation for effective treatment of ibuprofen-laden wastewater and enhanced anaerobic digestion performance
Water Research ( IF 11.4 ) Pub Date : 2024-12-19 , DOI: 10.1016/j.watres.2024.123006
Sining Zhou, Lei Qiao, Yanyan Jia, Samir Kumar Khanal, Lianpeng Sun, Hui Lu

The pharmaceutical industry plays a crucial role in driving global economic growth but also poses substantial environmental challenges, particularly in the efficient treatment of production wastewater. This study investigates the efficacy of micro-nano bubble (MNB) ozonation for treating high-strength ibuprofen (IBU)-laden wastewater (49.9 ± 2.3 mg/L) and mitigating its inhibitory effects on the anaerobic digestion (AD) of intralipid (IL)-laden wastewater. Our findings demonstrated that MNB ozonation achieved a 99.0 % removal efficiency of IBU within 70 min, significantly surpassing the 69.8 % efficiency observed with conventional ozonation under optimal conditions. Both conventional and MNB ozonation primarily transformed IBU through oxidation processes, including hydroxylation and the conversion of CH bonds to C = O groups, along with carbon cleavage. However, MNB ozonation markedly reduced the toxicity of IBU-laden wastewater by further transforming toxic by-products, particularly under mildly alkaline conditions (pH 7.2 and 9.0). This reduction in toxicity led to a significant improvement in subsequent AD performance; specifically, a 70-min MNB ozonation pretreatment enhanced methane production by 48.1 %, increased chemical oxygen demand removal by 35.6 %, and reduced fatty acid accumulation compared to the control without pretreatment. Additionally, the effluent from MNB ozonation positively impacted the microbial community, particularly by enriching syntrophic bacteria and methanogens. Overall, these findings offered new insights into the behavior and toxicity of IBU oxidation by-products in both conventional and MNB ozonation processes. Furthermore, this study proposed a novel strategy for the combined treatment of IBU- and IL-laden wastewaters, establishing a robust foundation for advancing MNB ozonation technology in engineered pharmaceutical wastewater treatment.

中文翻译:


微纳米气泡臭氧化可有效处理含布洛芬的废水并增强厌氧消化性能



制药行业在推动全球经济增长方面发挥着至关重要的作用,但也带来了重大的环境挑战,尤其是在生产废水的高效处理方面。本研究探讨了微纳米气泡 (MNB) 臭氧处理含高强度布洛芬 (IBU) 的废水 (49.9 ± 2.3 mg/L) 的疗效,并减轻其对含脂肪 (IL) 的废水厌氧消化 (AD) 的抑制作用。我们的研究结果表明,MNB 臭氧化在 70 分钟内实现了 IBU 的 99.0% 去除效率,显着超过了在最佳条件下传统臭氧化观察到的 69.8% 效率。常规和 MNB 臭氧化主要通过氧化过程转化 IBU,包括羟基化和 CH 键向 C = O 基团的转化,以及碳裂解。然而,MNB 臭氧化通过进一步转化有毒副产物,特别是在弱碱性条件下(pH 7.2 和 9.0),显著降低了含 IBU 的废水的毒性。这种毒性的降低导致随后的 AD 性能显着改善;具体来说,与未预处理的对照相比,70 min MNB 臭氧化预处理使甲烷产生量提高了 48.1%,化学需氧量去除量增加了 35.6%,并减少了脂肪酸积累。此外,MNB 臭氧化产生的废水对微生物群落产生了积极影响,特别是通过富集共养细菌和产甲烷菌。总体而言,这些发现为传统和 MNB 臭氧化过程中 IBU 氧化副产物的行为和毒性提供了新的见解。 此外,本研究提出了一种联合处理含 IBU 和 IL 的废水的新策略,为在工程制药废水处理中推进 MNB 臭氧化技术奠定了坚实的基础。
更新日期:2024-12-19
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