title: Temperature response of sulfide/ferrous oxidation and microbial community in anoxic sediments treated with calcium nitrate addition.
abstract: Nitrate-driven sulfide oxidation has been proved a cost-effective way to control sediments odor which has long been a universal problem for urban rivers in south China areas. In this work, sediments treatment experiments under a dynamic variation of temperature from 5 °C to 35 °C with 3% of calcium nitrate added were conducted to reveal the influence of temperature variation on this process. The results showed that microbial community was remarkably restructured by temperature variation. Pseudomonas (15.56-29.31%), Sulfurimonas (26.81%) and Thiobacillus (37.99%) were dominant genus at temperature of ≤15 °C, 25 °C and 35 °C, respectively. It seemed that species enrichment occurring at different temperature gradient resulted in the distinct variation of microbial community structure and diversity. Moreover, nitrate-driven sulfide and ferrous oxidation were proportionally promoted only when temperature increased above 15 °C. The dominant bacteria at high temperature stage were those genus that closely related to autotrophic nitrate-driven sulfide and ferrous oxidizing bacteria (e.g.Thiobacillus, Sulfurimonas and Thermomonas), revealing that promotion of sulfide/ferrous oxidation could be attributed to the change of dominant bacteria determined by temperature variation. Thus, a higher treatment efficiency by calcium nitrate addition for odor control would be achieved in summer than any other seasons in south China areas.
authors.affiliation: Department of Environmental Science and Engineering, College of Natural Resource and Environment, South China Agricultural University, Guangzhou 510642, China.
authors.forename: Zihao
authors.initials: Z
authors.lastname: He
authors.affiliation: Department of Environmental Science and Engineering, College of Natural Resource and Environment, South China Agricultural University, Guangzhou 510642, China. Electronic address: longxx@scau.edu.cn.
authors.forename: Xinxian
authors.initials: X
authors.lastname: Long
authors.affiliation: Department of Environmental Science and Engineering, College of Natural Resource and Environment, South China Agricultural University, Guangzhou 510642, China.
authors.forename: Luyao
authors.initials: L
authors.lastname: Li
authors.affiliation: Department of Environmental Science and Engineering, College of Natural Resource and Environment, South China Agricultural University, Guangzhou 510642, China. Electronic address: yuguangwei@scau.edu.cn.
authors.forename: Guangwei
authors.initials: G
authors.lastname: Yu
authors.affiliation: Department of Environmental Science and Engineering, College of Natural Resource and Environment, South China Agricultural University, Guangzhou 510642, China.
authors.forename: Yunxiao
authors.initials: Y
authors.lastname: Chong
authors.affiliation: Department of Environmental Science and Engineering, College of Natural Resource and Environment, South China Agricultural University, Guangzhou 510642, China.
authors.forename: Wen
authors.initials: W
authors.lastname: Xing
authors.affiliation: Department of Environmental Science and Engineering, College of Natural Resource and Environment, South China Agricultural University, Guangzhou 510642, China.
authors.forename: Ziao
authors.initials: Z
authors.lastname: Zhu
mesh_terms: D052818:Autotrophic Processes; D001419:Bacteria / Q000145:classification; D009566:Nitrates; D010084:Oxidation-Reduction; D013440:Sulfides; D013696:Temperature
chemical_list: D009566:Nitrates; D013440:Sulfides
keywords: Microbial community; Nitrate-driven sulfide/ferrous oxidation; Odor control; Sediments; Temperature response