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.
Periodic Alteration Characteristics of Biofilm in a Saturated Packed Biofilm Reactor
China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU]
volume:
第40卷
Number:
第19期
Page:
75-80
Column:
Date of publication:
2024-10-01
- Keywords:
- saturated packed biofilm reactor; biofilm; periodic alteration characteristic; extracellular polymeric substance
- 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.
Last Update:
2024-10-01