کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
6578243 | 1422928 | 2018 | 42 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Assessment of operational conditions towards mainstream partial nitritation-anammox stability at moderate to low temperature: Reactor performance and bacterial community
ترجمه فارسی عنوان
ارزیابی شرایط عملیاتی نسبت به پاکسازی نیتروژن جزئی-آناموکس پایدار در دمای متوسط تا کم: عملکرد راکتور و جامعه باکتریایی
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موضوعات مرتبط
مهندسی و علوم پایه
مهندسی شیمی
مهندسی شیمی (عمومی)
چکیده انگلیسی
This study aimed at assessing the performance and microbial community in a granular one-stage partial nitritation-anammox sequencing batch reactor (PNA-SBR) subjected to temperature transition from 25 to 15â¯Â°C without biomass acclimation. The PNA-SBR was operated by controlling the oxygen transfer rate (OTR) according to the ammonium loading rate (ALR), which resulted in micromolar (µM) bulk dissolved oxygen (DO) concentration. The applied strategy proved to be feasible to operate the one-stage PNA-SBR at mainstream conditions because it was possible to control nitritation according to anammox rate. Nitrogen removal rate (NRR) of 330.24â¯Â±â¯25.36â¯mgâ¯N·Lâ1·dâ1 was achieved at 25â¯Â°C. Nitratation control by µM bulk DO limited the NO3âproduction:NH4+removed at 0.28â¯Â±â¯0.04. No instability was experienced by decreasing the temperature to 15â¯Â°C, but removal rates were adapted to the resulting anammox activity, which decreased at low temperature. After temperature transition, nitratation was kept controlled and the NO3âproduction:NH4+removed molar ratio remained at 0.33â¯Â±â¯0.05, although anammox activity deteriorated and higher nitrate production was obtained. Sequencing analysis revealed the dominant bacterial groups in the microbial community that clustered within the phyla Planctomycetes, Proteobacteria, Chloroflexi, and Bacteroidetes. Temperature drop only affected bacterial abundance, but the main bacteria involved in nitrification and anammox processes did not change during the study. Candidatus Kuenenia was the main anammox genus. Moreover, the presence of bacterial groups associated with heterotrophic metabolism indicates denitrification might be supported by the release of dissolved organic carbon due to bacterial lysis, and lower nitrate effluent concentration could be reached in PNA reactors.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Chemical Engineering Journal - Volume 350, 15 October 2018, Pages 192-200
Journal: Chemical Engineering Journal - Volume 350, 15 October 2018, Pages 192-200
نویسندگان
Tiago R.V. Akaboci, Frederic Gich, Maël Ruscalleda, M. Dolors Balaguer, Jesús Colprim,