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Acute effects of Cu(II) and Cr(VI) on anammox nitrogen removal performance and microbial community structure
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Hui-min FU1, Ji-chun BAI1, Wen-ke LIU1, You-peng CHEN2, Shun-li CHENG3, Chong-yang XING1, 4, *
China Environmental Science | 2025, 45(6) : 3020 - 3027
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China Environmental Science | 2025, 45(6): 3020-3027
• Water Pollution Control •
Acute effects of Cu(II) and Cr(VI) on anammox nitrogen removal performance and microbial community structure
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Hui-min FU1, Ji-chun BAI1, Wen-ke LIU1, You-peng CHEN2, Shun-li CHENG3, Chong-yang XING1, 4, *
Affiliations
  • 1.College of Environment and Resources, Chongqing Technology and Business University, Chongqing 400067, China
  • 2.Key Laboratory of the Three Gorges Reservoir Region’s Eco-Environments, Ministry of Education, Chongqing University, Chongqing 400045, China
  • 3.Henan Academy of Sciences, Zhengzhou 450046, China
  • 4.SPIC Yuanda Environmental Protection Engineering Co., td., Chongqing 401122, China).
Published: 2025-06-20
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This study evaluated the short-term, acute impacts of elevated Cu(II) and Cr(VI) concentrations on the nitrogen-removal efficiency, microbial community composition, and predicted metabolic responses of anammox granular sludge. Results showed that 12mg/L Cu(II) induced a temporary inhibition of anammox activity. In contrast, 8mg/L Cr(VI) caused a near-complete cessation of nitrogen removal. High concentrations of Cu(II) and Cr(VI) decreased the relative abundance of Candidatus Kuenenia by 4.86% and 2.88%, respectively, indicating that heavy metals likely impair anammox performance by directly inhibiting key anammox bacteria. Functional-prediction analysis (PICRUSt2) suggested that, under Cu(II) and Cr(VI) stress, the anammox community upregulated pathways associated with cell motility, energy metabolism, chemotaxis, signal transduction, and xenobiotic biodegradation—presumably as adaptive responses to mitigate toxicity.

anammox  /  heavy metals  /  microbial community  /  high-throughput sequencing  /  microbial metabolism
Hui-min FU, Ji-chun BAI, Wen-ke LIU, You-peng CHEN, Shun-li CHENG, Chong-yang XING. Acute effects of Cu(II) and Cr(VI) on anammox nitrogen removal performance and microbial community structure[J]. China Environmental Science, 2025 , 45 (6) : 3020 -3027 .
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Year 2025 volume 45 Issue 6
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Article Info
  • Receive Date：2024-11-04
  • Online Date：2026-02-27
  • Published：2025-06-20
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  • Received：2024-11-04
Funding
Affiliations
    1.College of Environment and Resources, Chongqing Technology and Business University, Chongqing 400067, China
    2.Key Laboratory of the Three Gorges Reservoir Region’s Eco-Environments, Ministry of Education, Chongqing University, Chongqing 400045, China
    3.Henan Academy of Sciences, Zhengzhou 450046, China
    4.SPIC Yuanda Environmental Protection Engineering Co., td., Chongqing 401122, 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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