Department of Environmental Science and Engineering, College of Natural Resource and Environment, South China Agricultural University, Guangzhou 510642, China.
Department of Environmental Science and Engineering, College of Natural Resource and Environment, South China Agricultural University, Guangzhou 510642, China.
J Environ Manage. 2017 Apr 15;191:209-218. doi: 10.1016/j.jenvman.2017.01.008. Epub 2017 Jan 16.
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.
硝酸盐驱动的硫化物氧化已被证明是一种控制沉积物臭味的经济有效方法，而沉积物臭味一直是中国南方城市河流普遍存在的问题。在这项工作中，进行了温度从 5°C 到 35°C 动态变化且添加 3%硝酸钙的沉积物处理实验，以揭示温度变化对该过程的影响。结果表明，微生物群落因温度变化而发生显著重构。在温度≤15°C、25°C 和 35°C 时，优势属分别为假单胞菌（15.56-29.31%）、硫单胞菌（26.81%）和硫杆菌（37.99%）。似乎在不同温度梯度下发生的物种富集导致了微生物群落结构和多样性的明显变化。此外，只有当温度升高到 15°C 以上时，硝酸盐驱动的硫化物和亚铁氧化才会相应地促进。高温阶段的优势细菌是那些与自养硝酸盐驱动的硫化物和亚铁氧化细菌密切相关的属（如硫杆菌、硫单胞菌和嗜热单胞菌），这表明硫化物/亚铁氧化的促进可归因于温度变化引起的优势细菌的变化。因此，在中国南方地区，夏季通过添加硝酸钙进行处理的效率会比其他任何季节都高，从而更好地控制沉积物臭味。
