Fe<sup>0</sup> SUPPORTED MIXOTROPHIC DENITRIFICATION FOR GROUNDWATER TREATMENTS: PERFORMANCE AND POTENTIAL MECHANISM

SONG Binxue; HE Yueling; JIA Linchun; CENG Lin; CHEN Hong; XUE Gang

doi:10.13205/j.hjgc.202208003

Volume 40 Issue 8

Nov. 2022

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Article Navigation > ENVIRONMENTAL ENGINEERING > 2022 > 40(8): 22-30,54

MOU Zijie, LI Junqi, LI Xiaojing. RESEARCH PROGRESS ON APPLICATION OF GEOSYNTHETICS IN GREEN STORMWATER INFRASTRUCTURE[J]. ENVIRONMENTAL ENGINEERING , 2022, 40(8): 206-212. doi: 10.13205/j.hjgc.202208029

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SONG Binxue, HE Yueling, JIA Linchun, CENG Lin, CHEN Hong, XUE Gang. Fe⁰ SUPPORTED MIXOTROPHIC DENITRIFICATION FOR GROUNDWATER TREATMENTS: PERFORMANCE AND POTENTIAL MECHANISM[J]. ENVIRONMENTAL ENGINEERING , 2022, 40(8): 22-30,54. doi: 10.13205/j.hjgc.202208003

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Fe⁰ SUPPORTED MIXOTROPHIC DENITRIFICATION FOR GROUNDWATER TREATMENTS: PERFORMANCE AND POTENTIAL MECHANISM

doi: 10.13205/j.hjgc.202208003

1. School of Environmental Science and Engineering, Donghua University, Shanghai 201620, China;
2. National Engineering Research Center for Dyeing and Finishing of Textiles, Donghua University, Shanghai 201620, China

Received Date: 2021-08-25
Publish Date: 2022-11-08

Abstract

Abstract

To achieve high-efficiency denitrification of groundwater containing NO₃^--N, Fe⁰ was added to strengthen biological mixotrophic denitrification. The results showed that when C/N was 2.78~3.08, the average TN and NO₃^--N removal efficiency of reactor 1 were 39.6% and 40.1%, and they were 80.7% and 81.4% in reactor 2 adding Fe⁰. The results of substance transformation in a single batch of reactor 2 showed that one reaction cycle was composed of two stages: mixotrophic denitrification stage in 0~12 h and autotrophic denitrification stage in 12~24 h, and the denitrification process mainly occurred in stage of 0~12 h; the zero-order kinetics fitting results revealed that the denitrification rate was 2.38 mg/(L·h) in 0~12 h, 9.5 times of that in 12~24 h; in 4~12 h, the contribution ratio of autotrophic and heterotrophic denitrification was stable (about 4∶6), and contribution ratio of autotrophic denitrification was 100% in 12~24 h. Moreover, SEM and XRD analysis showed that there was significant microbial corrosion on the surface of Fe⁰, and the major products were FeOOH and bioorganic-Fe complexes. Microbial community structure analysis result indicated that Fe⁰ could effectively improve the diversity and richness of microbial community, and Zoogloea played a leading role in the denitrification process as the predominant genus.
- groundwater,
- Fe⁰,
- mixotrophic denitrification,
- C/N,
- microbial community structure

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References

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