کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
8852355 1618776 2018 10 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Mixed nitrifying bacteria culture under different temperature dropping strategies: Nitrification performance, activity, and community
ترجمه فارسی عنوان
کشت باکتری نیتروژن با استفاده از استراتژی های مختلف کاهش درجه حرارت: عملکرد نیتروفیزاسیون، فعالیت و جامعه
موضوعات مرتبط
علوم زیستی و بیوفناوری علوم محیط زیست شیمی زیست محیطی
چکیده انگلیسی
In this study, the nitrification performance, metabolic activity, antioxidant enzyme activity as well as bacterial community of mixed nitrifying bacteria culture under different temperature dropping strategies [(#1) growth temperature kept at 20 °C; (#2) sharp1 decreased from 20 °C to 10 °C; (#3) growth at 20 °C for 6 days followed by sharp decrease to 10 °C; and (#4) gradual decreased from 20 °C to 10 °C] were evaluated. It was shown that acclimation at 20 °C for 6 days allowed to maintain better nitrification activity at 10 °C. The nitrite oxidation capacity of nitrifiers was significantly correlated with the relative light unit (RLU) (p < .05) and the fluctuation of superoxide dismutase (SOD) enzyme activity (p < .01). With serial #3 showed the highest RLU levels and the least SOD enzyme fluctuation as compared to serials #2 and #4. Throughout the experimental period, Nitrosospira and Nitrosomonas as well as Nitrospira were identified as the predominant ammonia-oxidizing bacteria (AOB) and nitrate-oxidizing bacteria (NOB). The dynamic change of AOB/NOB ratios and nitrification activity in serials #2-#4 demonstrated that AOB recovered better than NOB with long-term 10 °C exposure, and the nitrification performance was mainly limited by the nitrite oxidation capacity of NOB. Applying 6 days acclimation at 20 °C was beneficial for the mixed nitrifying bacteria culture to cope with low temperature (10 °C) stress, possibly due to the maintenance of metabolic activity, antioxidant enzyme activity stability as well as appropriate AOB/NOB ratio.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Chemosphere - Volume 195, March 2018, Pages 800-809
نویسندگان
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