Key Laboratory of Plant Biotechnology of Liaoning Province, School of Life Sciences, Liaoning Normal University, Dalian, Liaoning, 116081, PR China.
Dalian Center for Certification and Food and Drug Control, Dalian, Liaoning, 116037, PR China.
J Environ Manage. 2024 Nov;370:122548. doi: 10.1016/j.jenvman.2024.122548. Epub 2024 Sep 18.
High-salt textile dyeing wastewater is difficult to treat. Magnetic fields can enhance the biodegradation capacity and extreme environmental adaptabilities of microorganisms. Thus, magnetically enhanced bioreactors are expected to improve the treatment efficiency and stability of high-salt textile dyeing wastewater. Accordingly, a novel Built-in Static Magnetic Field - Biological Aerated Filter (BSMF-BAF) was constructed and investigated for treating actual high-salt textile dyeing wastewater in this study. Two other BAFs packed with traditional and magnetic ceramsite carriers, respectively, were simultaneously operated for comparison. The removal of color, chemical oxygen demand (COD), suspended solid (SS) and acute toxicity were monitored. The activities of key enzymes and microbial community structure were analyzed to reveal possible mechanisms for improving the treatment efficiency of traditional BAF using the BSMF. The results showed that the BSMF-BAF possessed the highest removal efficiencies of color, COD, SS and acute toxicity among the three BAFs. The BSMF induced significant increases in the activities of azoreductase and lignin peroxidase, which were responsible for the degradation of azo compounds in the wastewater and the detoxification of toxic intermediates, respectively. Additionally, the BSMF induced the relative enrichment of potentially effective bacteria and fungi, and it maintained a relatively high abundance of fungi in the microbial community, resulting in a high treatment efficiency.
高盐纺织印染废水处理困难。磁场可以增强微生物的生物降解能力和极端环境适应性。因此，磁强化生物反应器有望提高高盐纺织印染废水的处理效率和稳定性。因此，本研究构建了一种新型内置静磁场-曝气生物滤池（BSMF-BAF），用于处理实际高盐纺织印染废水。同时运行了另外两个分别填充传统和磁性陶粒载体的 BAF 进行比较。监测了颜色、化学需氧量（COD）、悬浮固体（SS）和急性毒性的去除情况。分析了关键酶的活性和微生物群落结构，以揭示 BSMF 提高传统 BAF 处理效率的可能机制。结果表明，BSMF-BAF 在三种 BAF 中对颜色、COD、SS 和急性毒性的去除效率最高。BSMF 诱导了偶氮还原酶和木质素过氧化物酶活性的显著增加，这两种酶分别负责废水中偶氮化合物的降解和有毒中间产物的解毒。此外，BSMF 诱导了潜在有效细菌和真菌的相对富集，并保持了微生物群落中较高的真菌丰度，从而实现了较高的处理效率。
