کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
5740432 1616298 2017 13 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Development of simultaneous partial nitrification, anammox and denitrification (SNAD) in a non-aerated SBR
موضوعات مرتبط
علوم زیستی و بیوفناوری علوم محیط زیست علوم زیست محیطی (عمومی)
پیش نمایش صفحه اول مقاله
Development of simultaneous partial nitrification, anammox and denitrification (SNAD) in a non-aerated SBR
چکیده انگلیسی


- Successful development of SNAD in a non-aerated SBR.
- Major source of oxygen through diffusion from head space of reactor.
- SNAD developed using flocculent type activated sludge from a tannery CETP.
- Best removals of NH4-N (94%), COD (92%) and TN (82%) at COD/NH4-N equal to 1.
- Low cost SNAD applications possible in anoxic and photo-resistant shallow ponds.

The objective of this work was to develop simultaneous partial nitrification, anammox and denitrification (SNAD) process in a twenty liter non-aerated sequencing batch reactor (SBR). Flocculent type activated sludge sourced from a tannery common effluent treatment plant was used as seed biomass. The SBR was operated for 161 days in 23 cycles with initial feed concentrations of NH4-N and COD as 250 ± 14.9 mg l−1 and 250 ± 4.6 mg l−1, respectively. The process was developed in a non-mixing condition in a dark room with no temperature control, but the temperature in SBR varied between 30 °C and 36 °C. The average HRT was 10.5 d with SBR cycle time of 7 d. The last three cycles gave the best average removals of NH4-N (94%), COD (92%) and TN (82%). The conversion ratio Y(NO2-N+ NO3-N)/(NH4-N) during the last 10 cycles remained below 0.11, confirming a stable SNAD process. Maximum specific substrate (NH4-N, COD and TN) utilization rates of SNAD biomass were determined as 185 mg NH4-N g−1 MLVSS d−1, 153 mg COD g−1 MLVSS d−1 and 172 mg N g−1 MLVSS d−1. These results contribute towards the application of SNAD process in shallow anoxic ponds/tanks/ditches in the absence of sunlight.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: International Biodeterioration & Biodegradation - Volume 119, April 2017, Pages 43-55
نویسندگان
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