کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
4755232 | 1361513 | 2016 | 10 صفحه PDF | دانلود رایگان |
- Proposed combined organic and nitrogen removal in an anaerobic/aerobic batch system.
- Substrate COD was efficiently degraded by methanogenesis and denitrification.
- Higher recirculation ratios were favourable for enhancing the denitrification.
- Results showed that high recirculation during the active solubilization was optimal.
An anaerobic-aerobic sequential batch system using simultaneous organic and nitrogen removal was investigated to treat intermittently discharged organic solid wastes. Two different recirculation ratios of 10% and 20% dayâ1 of liquid volume of the anaerobic reactor were examined. In both conditions, methanogenesis occurred during the first 5Â days of the process, whereas only denitrification occurred during the subsequent 10Â days. At the end of the experiment, high COD removal efficiencies of 97.7% and 96.4% were achieved for the 10% and 20%Â dayâ1 recirculation ratios, respectively. A relatively large amount of COD consumed by denitrification was achieved for the 20%Â dayâ1 condition, indicating that an increase in the recirculation ratio enhances denitrification. Consequently, the final nitrogen removal efficiencies were 69.0% and 81.9% for the 10% and 20%Â dayâ1 recirculation ratios, respectively. To optimize the recirculation ratio, model equations were developed for the scale of this study. The modelling results demonstrated that high recirculation during the active solubilization period enhances the nitrogen removal efficiency. Recirculating 35%Â dayâ1 during the first 5Â days and 10% dayâ1 during the subsequent 10Â days is recommended as optimal for achieving high organic and nitrogen removal efficiencies.
226
Journal: Process Biochemistry - Volume 51, Issue 9, September 2016, Pages 1264-1273