Pyrite-Based Autotrophic Denitrifying Microorganisms Derived from Paddy Soils: Effects of Organic Co-Substrate Addition

Baokun Xu, Xiaoxia Yang, Yalong Li, Kejun Yang (), Yujiang Xiong and Niannian Yuan
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Baokun Xu: Agricultural Water Conservancy Department, Changjiang River Scientific Research Institute, Wuhan 430010, China
Xiaoxia Yang: Chongqing Water Resources Bureau, Chongqing 401147, China
Yalong Li: Agricultural Water Conservancy Department, Changjiang River Scientific Research Institute, Wuhan 430010, China
Kejun Yang: School of Law, Zhongnan University of Economics and Law, Wuhan 430073, China
Yujiang Xiong: Agricultural Water Conservancy Department, Changjiang River Scientific Research Institute, Wuhan 430010, China
Niannian Yuan: Agricultural Water Conservancy Department, Changjiang River Scientific Research Institute, Wuhan 430010, China

IJERPH, 2022, vol. 19, issue 18, 1-20

Abstract: The presence of organic co-substrate in groundwater and soils is inevitable, and much remains to be learned about the roles of organic co-substrates during pyrite-based denitrification. Herein, an organic co-substrate (acetate) was added to a pyrite-based denitrification system, and the impact of the organic co-substrate on the performance and bacterial community of pyrite-based denitrification processes was evaluated. The addition of organic co-substrate at concentrations higher than 48 mg L −1 inhibited pyrite-based autotrophic denitrification, as no sulfate was produced in treatments with high organic co-substrate addition. In contrast, both competition and promotion effects on pyrite-based autotrophic denitrification occurred with organic co-substrate addition at concentrations of 24 and 48 mg L −1 . The subsequent validation experiments suggested that competition had a greater influence than promotion when organic co-substrate was added, even at a low concentration. Thiobacillus , a common chemolithoautotrophic sulfur-oxidizing denitrifier, dominated the system with a relative abundance of 13.04% when pyrite served as the sole electron donor. With the addition of organic co-substrate, Pseudomonas became the dominant genus, with 60.82%, 61.34%, 70.37%, 73.44%, and 35.46% abundance at organic matter concentrations of 24, 48, 120, 240, and 480 mg L −1 , respectively. These findings provide an important theoretical basis for the cultivation of pyrite-based autotrophic denitrifying microorganisms for nitrate removal in soils and groundwater.

Keywords: pyrite; autotrophic denitrification; organic co-substrate; microbial community (search for similar items in EconPapers)
JEL-codes: I I1 I3 Q Q5 (search for similar items in EconPapers)
Date: 2022
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