Effect of exogenous AHLs on ANAMMOX biofilm process under natural temperature in winter
LUO Rong1, LI Jun1, GAO Peng1, ZHANG Jing2, XIE Chao-fan1, ZHANG Yi1
1. Faculty of Urban Construction, Beijing University of Technology, Beijing 100124, China; 2. College of Civil and Architectural Engineering, North China University of Science and Technology, Tangshan 063210, China
Abstract:Maintaining the efficient performance of anaerobic ammonia oxidation (ANAMMOX) biofilm under low-temperature conditions is a great challenge. The effects of two exogenous signaling molecules, hexanoyl homoserine lactone (C6-HSL) and octanoyl homoserine lactone (C8-HSL), on the ANAMMOX biofilm process were examined under the natural temperature in winter. The results showed that the addition of C6-HSL and C8-HSL promoted the nitrogen removal performance of the process under low temperature fluctuation, which increased the total nitrogen removal by 48.09% and 44.36%, respectively, and effectively enhanced the adaptability of ANAMMOX biofilm to the low-temperature environment. Under the low-temperature fluctuation, C6-HSL and C8-HSL regulated the activities of hydrazine dehydrogenase (HDH) (1.77 and 1.57 times higher than that of the control group, respectively), which significantly enhanced the activities of ANAMMOX; promoted the secretion of PN and PS in the extracellular polymers (EPS), especially in the TB-EPS, and altered the hydrophobicity of the secondary structure of proteins, which led to enhanced biofilm adhesion performance ( The OD600 values were enhanced by 55.12% and 68.32%, respectively). In addition, based on 16S rRNA sequencing, C6-HSL and C8-HSL effectively promoted the growth of Candidatus Kuenenia at low temperature and up-regulated the abundance of functional genes related to nitrogen metabolism.
罗镕, 李军, 高鹏, 张晶, 谢超凡, 张一. 冬季自然温度下外加AHLs对ANAMMOX生物膜的影响[J]. 中国环境科学, 2024, 44(8): 4292-4302.
LUO Rong, LI Jun, GAO Peng, ZHANG Jing, XIE Chao-fan, ZHANG Yi. Effect of exogenous AHLs on ANAMMOX biofilm process under natural temperature in winter. CHINA ENVIRONMENTAL SCIENCECE, 2024, 44(8): 4292-4302.
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