Journal
ENVIRONMENTAL POLLUTANTS AND BIOAVAILABILITY
Volume 34, Issue 1, Pages 154-161Publisher
TAYLOR & FRANCIS LTD
DOI: 10.1080/26395940.2022.2064337
Keywords
Nitrogen stripping; Desulfovibrio; coexistence; anaerobic system; sulfate-rich wastewater
Funding
- National Natural Science Foundation of China [52070123]
- Natural Science Foundation of Shandong Province [ZR2020ME224]
- Project of Shandong Province Higher Educational Young Innovative Talent Introduction and Cultivation Team [Wastewater treatment and resource innovation team]
- high-quality curriculum construction project of graduate education of Shandong University of science and technology
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This study simultaneously analyzed the interactions between nitrogen stripping, sulfate reduction capacity, S-2 (-) concentration, and microbial community structure. The results showed that after nitrogen stripping, the increased relative abundance of fermentative bacteria accelerated carbon source conversion and facilitated sulfate reduction, thereby increasing the sulfate reduction rate.
Nitrogen stripping plays a vital role during the sulfate-rich wastewater treatment process by sulfate-reducing bacteria (SRB). However, the interaction between nitrogen stripping, sulfate reduction capacity, S-2 (-) concentration, and microbial community structure is rarely studied. Here, two anaerobic systems were conducted to analyze these interactions simultaneously. Results showed that the toxic products (H2S) were stripped by nitrogen at first. Then, the increased relative abundance of fermentative bacteria accelerated the carbon sources conversion, and Desulfovibrio, Dethiosulfovibrio, and Sulfurospirillum facilitated the sulfate reduction after nitrogen stripping. Finally, the produced S2- concentration was increased by 12%, and the sulfate reduction rate was increased by 9.2% compared to that without nitrogen stripping.
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