LISong-bo,YINShun-chang,WANGXiao-yu,et al.Degradation of Rhodamine B Using Extended Filamentous Aerobic Granular Sludge[J].China Water & Wastewater,2025,41(13):33-39.
外伸型丝状菌好氧颗粒污泥对罗丹明B的降解效能
- Title:
- Degradation of Rhodamine B Using Extended Filamentous Aerobic Granular Sludge
- Keywords:
- extended filamentous bacteria; aerobic granular sludge; rhodamine B; organic matter removal
- 摘要:
- 采用2个相同的序批式反应器（SBR，R1和R2）研究外伸型丝状菌好氧颗粒污泥（AGS）对罗丹明B（RhB）的降解效能。2个SBR接种等量脱水污泥后，在第30天成功培养出外伸型丝状菌AGS；对照组R1未投加RhB，丝状菌过度增殖未得到有效控制，导致AGS失稳。R2在第31~70天投加5~15 mg/L的RhB，可有效抑制丝状菌Proteobacteria、Actinobacterota和Chloroflexi；当RhB投加量达到20 mg/L时，R2在曝气过程中会产生大量气泡，颗粒污泥伴随气泡溢出而流失，不利于AGS的稳定运行。因此，在第71天R2停止投加RhB，AGS逐渐恢复并实现稳定运行。R2对RhB的去除率可维持在67.4%~78.1%，去除过程通过微生物吸附和转化来实现，且以前者为主；投加RhB后COD去除率仍可保持在93.4%以上，而NH4+-N和TP去除率分别从89.0%、100.0%降至67.7%、66.3%。微生物分析结果表明，投加RhB并未抑制与COD降解相关的微生物，却能显著抑制与N和P去除相关的微生物。
- Abstract:
- The performance of extended filamentous aerobic granular sludge (AGS) for degrading rhodamine B (RhB) was investigated in two identical sequencing batch reactors (SBR, R1 and R2). Both SBRs were inoculated with an identical quantity of dewatered sludge, and the extended filamentous AGS was successfully cultivated on day 30. In the control group R1, where RhB was not added, the excessive growth of filamentous bacteria could not be effectively controlled, leading to instability in the AGS system. R2 was supplemented with 5-15 mg/L of RhB from day 31 to day 70, effectively inhibiting the growth of filamentous bacteria, including Proteobacteria, Actinobacterota, and Chloroflexi. When the dosage of RhB reached 20 mg/L, R2 produced a significant amount of bubbles during the aeration process, leading to the loss of granular sludge through bubble overflow. This phenomenon negatively impacted the stable operation of AGS. Therefore, R2 immediately ceased the addition of RhB on day 71, allowing AGS to gradually recover and restore stable operation. Meanwhile, the removal efficiency of RhB in R2 was maintained within the range of 67.4% to 78.1%. This process was primarily driven by microbial adsorption, with microbial transformation also contributing but playing a secondary role. After the addition of RhB, the removal efficiency of COD was maintained at above 93.4%. In contrast, the removal efficiencies of NH4+-N and TP decreased significantly, dropping from 89.0% and 100.0% to 67.7% and 66.3%, respectively. The results of the microbial analysis demonstrated that the addition of RhB did not exert inhibitory effects on microorganisms involved in COD degradation, yet it significantly suppressed the microorganisms associated with N and P removal.
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