Performance of the dominant bacterial species and microbial community in autotrophic denitrification coupled with iron cycle in immobilized systems. Issue 1 (15th April 2017)

• Record Type: Journal Article
• Authors: Su, Jun feng; Cheng, Ce; Huang, Tinglin; Wei, Li
• Is Part Of: Marine pollution bulletin. Volume 117:Issue 1/2(2017)
• Page Start: 88
• Page End: 97
• Publication Date: 2017-04-15
• Subjects: Autotrophic denitrification -- Klebsiella sp. FC61 -- Iron cycle -- Immobilized systems -- Microbial community; Marine pollution -- Periodicals; Marine Biology -- Periodicals; Water Pollution -- Periodicals; Mer -- Pollution -- Périodiques; Publications périodiques; Pollution des mers; Lutte antipollution; Electronic journals; 363.7394
• DOI: 10.1016/j.marpolbul.2017.01.075
• Languages: English
• ISSNs: 0025-326X

Abstract

Abstract: We used three stable reactors to investigate the rates of nitrate removal coupled with iron cycle and the subsequent influence of the reaction on bacterial communities. The iron-reducing bacterium Klebsiella sp. FC61 was immobilized on the reactor columns of the experimental groups B (only Klebsiella ) and C ( Klebsiella + magnetite). With the fluctuation of Fe 2 + to Fe3 + (iron cycle), the average nitrate removal efficiency increased from 73.22% to 93.91% and 86.92% to 97.84% in groups B and C, respectively, as the influent nitrate concentration decreased from 40 to 10 mg/L. However, the average rate of nitrate removal showed the opposite trend (from 2.08 mg/L/h to 0.67 mg/L/h and 2.41 mg/L/h to 0.69 mg/L/h in groups B and C, respectively) as the influent nitrate concentration decreased. Analysis of microbial distribution and community structures indicated that the population of Klebsiella sp. increased in groups B (from 18.21% to 41.21%) and C (from 25.43% to 46.80%) and contributed to the effective removal of nitrate in the reactors. Highlights: Autotrophic denitrification was achieved using immobilized systems coupled with iron cycle. A high average nitrate removal efficiency of 97.84% was obtained at low nitrate concentration. Magnetite addition aided the removal rate of nitrate. Klebsiella sp. FC61 was the dominant contributor for effective nitrate removal.