Industrial wastewaters are becoming increasingly associated with extreme conditions such as the presence of refractory compounds and high salinity that adversely affect biomass retention or reduce biological activity. Hence, this study evaluated the impact of long-term salinity increase to 20 gNa⁺.L⁻¹ on the bioconversion performance and microbial community composition in anaerobic membrane bioreactors treating phenolic wastewater. Phenol removal efficiency of up to 99.9% was achieved at 14 gNa⁺.L⁻¹. Phenol conversion rates of 5.1 mgPh.gVSS⁻¹.d⁻¹, 4.7 mgPh.gVSS⁻¹.d⁻¹, and 11.7 mgPh.gVSS⁻¹.d⁻¹ were obtained at 16 gNa⁺.L⁻¹,18 gNa⁺.L⁻¹ and 20 gNa⁺.L⁻¹, respectively. The AnMBR's performance was not affected by short-term step-wise salinity fluctuations of 2 gNa⁺.L⁻¹ in the last phase of the experiment. It was also demonstrated in batch tests that the COD removal and methane production rate were higher at a K⁺:Na⁺ ratio of 0.05, indicating the importance of potassium to maintain the methanogenic activity. The salinity increase adversely affected the transmembrane pressure likely due to a particle size decrease from 185 μm at 14 gNa⁺.L⁻¹ to 16 μm at 20 gNa⁺.L⁻¹. Microbial community was dominated by bacteria belonging to the Clostridium genus and archaea by Methanobacterium and Methanosaeta genus. Syntrophic phenol degraders, such as Pelotomaculum genus were found to be increased when the maximum phenol conversion rate was attained at 20 gNa⁺.L⁻¹. Overall, the observed robustness of the AnMBR performance indicated an endured microbial community to salinity changes in the range of the sodium concentrations applied.

工业废水越来越多地与极端条件联系在一起，例如难熔化合物的存在和高盐度，这些不利影响生物质的保留或降低生物活性。因此，本研究评估了长期盐度增加至20 gNa ⁺ .L ^-1对厌氧膜生物反应器处理含酚废水的生物转化性能和微生物群落组成的影响。在14 gNa ⁺ .L ^-1时，苯酚的去除效率高达99.9％。5.1 mgPh.gVSS的苯酚转化率^-1 .D ^-1，4.7 mgPh.gVSS ^-1 .D ^-1和11.7 mgPh.gVSS ^-1 .D ^-1在16 GNA得到⁺ .L ^-1，18 GNA ⁺ .L ^-1和20 GNA ⁺ .L ^-1，分别。在实验的最后阶段，AnMBR的性能不受短期逐步盐度波动2 gNa ⁺ .L ^-1的影响。在分批测试中还证明，在K ⁺：Na ⁺比率为0.05时，COD去除率和甲烷生成率更高，这表明钾对于保持产甲烷活性至关重要。盐度增加可能会对跨膜压力产生不利影响，这可能是由于在14 gNa ⁺ .L下粒径从185μm减小在20 gNa ⁺ .L ^-1下为^-1至16μm 。微生物群落主要由甲烷杆菌属和甲烷菌属属的梭状芽胞杆菌属和古细菌组成。当在20 gNa ⁺ .L ^-1处获得最大的苯酚转化率时，发现腐殖酚降解物（例如Pelotomaculum属）增加。总体而言，观察到的AnMBR性能的鲁棒性表明微生物群落对所施加的钠浓度范围内的盐度变化具有持久性。