ZHENGYu-kai,OUYANGXiao,ZHURen-cheng,et al.Periodic Alteration Characteristics of Biofilm in a Saturated Packed Biofilm Reactor[J].China Water & Wastewater,2024,40(19):75-80.
饱和填充生物膜反应器生物膜周期性变化特征
- Title:
- Periodic Alteration Characteristics of Biofilm in a Saturated Packed Biofilm Reactor
- 关键词:
- 饱和填充生物膜反应器; 生物膜; 周期特征; 胞外聚合物
- Keywords:
- saturated packed biofilm reactor; biofilm; periodic alteration characteristic; extracellular polymeric substance
- 摘要:
- 以饱和填充生物膜反应器为研究对象，分析其填料生物膜的周期性变化特征，以及由此引起的出水水质周期性变化情况。结果表明，在一个运行周期内，饱和填充生物膜反应器出水COD、BOD5、NH3-N和SS的浓度呈现先增后降的趋势，TP呈现持续增加的趋势，而TN没有明显的周期性变化；生物膜生物量在0~5 h增长缓慢，在5~20 h增长迅速，在20~30 h增速放缓；生物膜胞外聚合物（EPS）中多糖（PS）和蛋白质（PN）成分含量以及PS/PN均呈现先增后降的趋势；生物膜表观产率系数（Yobs）在0~5 h无明显变化，而在5~30 h呈现出迅速增长的趋势；表观镜检结果表明，填料生物膜在前期仅有少量表面光滑的杆菌，在10~30 h出现表面包裹黏液物质的球菌，且细菌数量和种类明显增多。
- Abstract:
- The periodic alteration characteristic of the biofilm in a saturated packed biofilm reactor and the consequent periodic alterations of the effluent quality were analyzed. In one operating cycle, the effluent COD, BOD5, NH3-N and SS from the saturated packed biofilm reactor exhibited a trend of initial increase followed by decrease, TP demonstrated a trend of continuous increase, while TN showed no obvious periodic variation. The biofilm biomass rose gradually within the period of 0 h to 5 h, rapidly from 5 h to 20 h, and then decelerated from 20 h to 30 h. The components of polysaccharide (PS) and protein (PN) within the extracellular polymeric substance (EPS) of the biofilm initially increased and subsequently decreased, and the PS/PN ratio demonstrated similar trend of change. The apparent yield coefficient of the biofilm (Yobs) remained relatively unchanged within the 0-5 h period, but increased rapidly from 5 h to 30 h. The biofilm microscopic images indicated that only a few bacilli with smooth surface were present in the bacteria in the initial stage. Cocci coated with mucous substances emerged within 10 h to 30 h, and the number and species of bacteria increased significantly.
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