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Sustaining bioreactor efficacy in rural wastewater treatment under intermittent flow interruption: Elucidating microbial EPS-mediated stress adaptation mechanisms
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Ya-jiao LI1, Xiao-yu JIANG1, Yu-lei CHI1, Bin-hong ZHANG2, Wu-ang REN1, *, Xiao-qian DING1, Kai JU1, Peng-kang JIN3
China Environmental Science | 2025, 45(5) : 2434 - 2442
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China Environmental Science | 2025, 45(5): 2434-2442
• Water Pollution Control •
Sustaining bioreactor efficacy in rural wastewater treatment under intermittent flow interruption: Elucidating microbial EPS-mediated stress adaptation mechanisms
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Ya-jiao LI1, Xiao-yu JIANG1, Yu-lei CHI1, Bin-hong ZHANG2, Wu-ang REN1, *, Xiao-qian DING1, Kai JU1, Peng-kang JIN3
Affiliations
  • School of Architecture and Civil Engineering, Xi’an University of Science and Technology, Xi’an 710054, China
  • 2.Zhonglian Northwest Engineering Design and Research Institute Co., Ltd., Xi’an 710076, China
  • 3.School of Human Settlements and Civil Engineering, Xi’an Jiaotong University, Xi’an 710049, China
Published: 2025-05-20
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The adaptive resilience of microorganisms is crucial for maintaining the stable operation of Biotrickling filters under intermittent flow interruption. This process is intrinsically related to the ability of microorganism to store active substances as Extracellular Polymeric Substances（EPS）. To elucidate this mechanism, a comparative analysis was conducted on biofilm structural characteristics, EPS compositional variations, and functional group transformations during an operation cycle of Biotrickling filters. The correlation between EPS-mediated stress response mechanisms and microbial activity maintenance/recovery was investigated. The results revealed that the removal of COD and NH4+-N reached（95.56±1.10）% and（87.06±2.08）% respectively in the biotrickling filter operated under intermittent flow. Under the regulation of EPS, the biofilm showed a loose and porous structure. During flow interruption phases, microorganisms activated starvation adaptation strategies by converting carbon sources adsorbed in SB-EPS and metabolizing polysaccharides stored in SB-EPS. The structure integrity of microorganisms was maintained via synergistic effects of hydrophobic functional groups within EPS and polymer bridging interactions. Accordingly, an EPS-mediated stress adaptation system responsive to starvation-recovery alternations was established, enabling sustainable operation of Biotrickling filters.

biotrickling filter  /  intermittent flow interruption  /  biofilm structure  /  extracellular polymeric substances  /  stress mechanism
Ya-jiao LI, Xiao-yu JIANG, Yu-lei CHI, Bin-hong ZHANG, Wu-ang REN, Xiao-qian DING, Kai JU, Peng-kang JIN. Sustaining bioreactor efficacy in rural wastewater treatment under intermittent flow interruption: Elucidating microbial EPS-mediated stress adaptation mechanisms[J]. China Environmental Science, 2025 , 45 (5) : 2434 -2442 .
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Year 2025 volume 45 Issue 5
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Article Info
  • Receive Date：2024-10-19
  • Online Date：2026-03-18
  • Published：2025-05-20
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  • Received：2024-10-19
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Affiliations
    School of Architecture and Civil Engineering, Xi’an University of Science and Technology, Xi’an 710054, China
    2.Zhonglian Northwest Engineering Design and Research Institute Co., Ltd., Xi’an 710076, China
    3.School of Human Settlements and Civil Engineering, Xi’an Jiaotong University, Xi’an 710049, China
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表12种不同金属材料的力学参数
科
Family		 属数
Number of
genus		 种数
Number of
species		 占总种数比例
Percentage of
total species (%)		 属
Genus		 种数
Number of
species		 占总种数比例
Percentage of total
species (%)
鹅膏菌科Amanitaceae 2 11 5.26 鹅膏菌属 Amanita 10 4.78
小菇科 Mycenaceae 2 12 5.74 丝盖伞属 Inocybe 5 2.39
多孔菌科 Polyporaceae 8 14 6.70 蜡蘑属 Laccaria 5 2.39
红菇科 Russulaceae 3 23 11.00 小皮伞属 Marasmius 6 2.87
小菇属 Mycena 11 5.26
光柄菇属 Pluteus 5 2.39
红菇属 Russula 17 8.13
栓菌属 Trametes 5 2.39
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