Performance analysis of iron-carbon autotrophic denitrification for efficient removal of nitrate from anammox effluent

XING Wei; LI Long-sheng; GAO Dao-qing; Zhang Ze-xi; ZHOU Guang-xin; YAO Hong

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China Environmental Science ›› 2024, Vol. 44 ›› Issue (8) : 4400-4406.

Water Pollution Control

Performance analysis of iron-carbon autotrophic denitrification for efficient removal of nitrate from anammox effluent

XING Wei^1,2, LI Long-sheng¹, GAO Dao-qing¹, Zhang Ze-xi¹, ZHOU Guang-xin¹, YAO Hong^1,2

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Abstract

The investigation of nitrate removal from anammox effluent using the iron-carbon autotrophic denitrification process, involved the examination of continuous operation, iron precipitation transformation, and microbial community structure. The study revealed the coupling mechanism between the iron-carbon carrier and biofilm, demonstrating the efficient removal of nitrate through the iron-carbon autotrophic denitrification process. At HRT of 16.6h, the total nitrogen (TN) removal efficiency of anammox effluent was found to be (90.0±4.7) %. Conversely, the TN removal rate of anammox effluent was (82.2±1.4) % at HRT of 13.3h. During Stage I, Fe₃O₄ was identified as the predominant form of iron precipitation within the biofilm, whereas in Stage III, there was a decrease in Fe₃O₄ and an increase in the density of FeOOH type iron precipitation. Throughout the iron-carbon autotrophic denitrification process, the prevalence of Dechloromonas, the primary denitrifying bacterium in the initial sludge inoculum, experienced a notable decrease. Conversely, there was an enrichment of autotrophic denitrifying bacteria and iron-converting bacteria, exemplified by the rise in relative abundance of Thermomonas from 0.70% on day 43 to 4.51% on day 120.

Key words

autotrophic denitrification / biofilm / iron precipitation / iron-carbon carrier / microbial community

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XING Wei, LI Long-sheng, GAO Dao-qing, Zhang Ze-xi, ZHOU Guang-xin, YAO Hong. Performance analysis of iron-carbon autotrophic denitrification for efficient removal of nitrate from anammox effluent[J]. China Environmental Science. 2024, 44(8): 4400-4406

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