Wu H F, Yue L Z, Jiang S L, Lu Y Q, Wu Y X, Wan Z Y
Department of Municipal Engineering, College of Urban Construction, Nanjing Tech University, Nanjing 211816, China E-mail:
Water Sci Technol. 2019 May;79(10):2005-2012. doi: 10.2166/wst.2019.202.
Polyvinyl alcohol (PVA) is the main pollutant in printing and dyeing wastewaters. This pollutant exhibits great demand, poor biodegradability and refractory degradation. In this study, PVA wastewater treatment experiments were conducted in a stably operating baffled anaerobic bioreactor (ABR) by using simulated PVA wastewater. The PVA degradation pathway and mechanism of the mixed dominant PVA-degrading bacterial strains were identified through the analysis of their degradation products. From the results, we inferred that PVA was degraded in a stepwise process under the synergistic action of different extracellular and intracellular enzymes produced by the mixed dominant PVA-degrading bacterial strains. In this process, PVA was first degraded into ketones, fatty acids and alcohols. It was then regenerated into acetic acid, hydrogen and carbon dioxide. Finally, these substances could be further utilized by methanogens. PVA was thus degraded completely. This study may serve as a reference for future works on the degradation of PVA in the ecological environment. It may also guide the sustainable development of PVA.
聚乙烯醇（PVA）是印染废水中的主要污染物。这种污染物需求量大、生物降解性差且难降解。在本研究中，使用模拟PVA废水在稳定运行的折流式厌氧生物反应器（ABR）中进行了PVA废水处理实验。通过分析混合优势PVA降解菌株的降解产物，确定了其PVA降解途径和机制。从结果推断，在混合优势PVA降解菌株产生的不同胞外和胞内酶的协同作用下，PVA以逐步过程降解。在此过程中，PVA首先降解为酮、脂肪酸和醇。然后再生成乙酸、氢气和二氧化碳。最后，这些物质可被产甲烷菌进一步利用。PVA从而被完全降解。本研究可为未来生态环境中PVA降解的研究提供参考。它也可能指导PVA的可持续发展。
