کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5740356 | 1616295 | 2017 | 9 صفحه PDF | دانلود رایگان |
- Partial-denitrification for nitrite production was established in SBR and USB.
- NPR of 0.12-2.21 kgN mâ3 dâ1 in SBR and 0.80-13.85 kgN mâ3 dâ1 in USB was obtained.
- Nitrite production rate achieved 3.54 and 5.58 g N gVSSâ1 dâ1 in SBR and USB.
- Granulation was observed in SBR and USB with diameter of 1.5-2.0Â mm and 2.0-3.0Â mm.
- The suitability of partial-denitrification effluent for anammox was evaluated.
Partial-denitrification (nitrate (NO3â-N) â nitrite (NO2â-N)) holds great potential in treating NO3â-N contained wastewater, by combining with anammox process. In this study, performance of NO2â-N production in partial-denitrification was investigated in two installations: sequencing batch reactor (SBR) and upflow sludge blanket (USB) reactor. Results indicated that partial-denitrification was established successfully in both of SBR and USB, with the NO2â-N production rate (NPR) of 0.13-2.11 kg N mâ3 dâ1 and 0.90-13.03 kg N mâ3 dâ1, respectively. The NO3â-N to NO2â-N transformation ratio (NTR) was approximately 83.3% in SBR, while NTR of 51.0%-71.3% was obtained in USB. Sludge granulation was observed in both two reactors during the operation. In SBR, granular diameter of 1.5-2.0 mm was reached with sludge volume index (SVI) of 54.3 mL gSSâ1, and 2.0-3.0 mm in USB with SVI of 62.1 mL gSSâ1. Additionally, the ratio of COD to NO2â-N (COD/NO2â-N) and NO3â-N to NOXâ-N percentage (NP) in partial-denitrification effluent demonstrated its suitability for subsequent anammox. While, partial-denitrification conducted in SBR was more suitable for low NO3â-N wastewater (30 mg Lâ1), and USB was appropriate for high-strength sewage. Results obtained in this study provide a solid foundation for future applying partial-denitrification combined with anammox process in treating NO3â-N contained wastewater.
Journal: International Biodeterioration & Biodegradation - Volume 122, August 2017, Pages 38-46