http://repository.iitr.ac.in/handle/123456789/4915| Title: | Role of volume exchange ratio and non-aeration time in spillage of nitrogen in continuously fed and intermittently decanted sequencing batch reactor |
| Authors: | Khursheed A. Gaur R.Z. Bhatia A. Khan A.A. Tyagi V.K. Kazmi, Absar Ahmad |
| Published in: | Chemical Engineering Journal |
| Abstract: | The present approach addresses to remove all forms of nitrogen; including recalcitrant dissolved organic nitrogen (rDON) from finally treated effluents. This lab-scale study, suggests that the total nitrogen (TN) removal by continuous fill sequencing batch reactor (cSBR) may not be best as compared to SBR due to spillage of nutrients entered during settling and decantation period. The phenomenon of spillage supported by corresponding dispersion model (plug flow with mild dispersion, 0.081±0.041) and stoichiometric assessment based on balanced chemical equations; revealed that the spill concentration is primarily based on volume exchange ratio, non-aeration out of total cycle time and influent soluble total Kjeldahl nitrogen (TKN). Low C/N ratio acts as limiting factor for denitrification. The C/N ratio was found to be 1.25-6.75 to give TN removals from 35-85%. The average denitrification rate of 0.24gNO 3 -removed/gBODd in cSBR as compared to 0.198gNO 3 -removed/gBODd made cSBR favourable by around 18% (stoichiometrically, 14.2%) just by virtue of availability of more BOD for denitrification due its spillage. However, the spillage of TKN reverted this advantage of cSBR, rendering SBR ahead of it with respect to TN removal. © 2012 Elsevier B.V. |
| Citation: | Chemical Engineering Journal(2012), 191(): 75-84 |
| URI: | https://doi.org/10.1016/j.cej.2012.02.067 http://repository.iitr.ac.in/handle/123456789/4915 |
| Issue Date: | 2012 |
| Keywords: | C/N ratio Continuous flow SBR Dispersion model Nitrogen removal Stoichiometry |
| ISSN: | 13858947 |
| Author Scopus IDs: | 7005362932 42661150500 44760896800 7404909843 36776464800 6701514485 |
| Author Affiliations: | Khursheed, A., Department of Civil Engineering, Indian Institute of Technology Roorkee, Roorkee 247667, India Gaur, R.Z., Department of Civil Engineering, Indian Institute of Technology Roorkee, Roorkee 247667, India Bhatia, A., Department of Civil Engineering, Indian Institute of Technology Roorkee, Roorkee 247667, India Khan, A.A., Department of Civil Engineering, Indian Institute of Technology Roorkee, Roorkee 247667, India Tyagi, V.K., Graduate Institute of Environmental Engineering, National Taiwan University, Taipei 106, Taiwan Kazmi, A.A., Department of Civil Engineering, Indian Institute of Technology Roorkee, Roorkee 247667, India |
| Funding Details: | We thank Ministry of Environment and Forests, New Delhi for sponsoring the research project entitled, “Pilot Plant Study of Organics, Nitrogen, and Coliforms Removal in SBR”. |
| Corresponding Author: | Khursheed, A.; Department of Civil Engineering, Indian Institute of Technology Roorkee, Roorkee 247667, India; email: akhursheed@rediffmail.com |
| Appears in Collections: | Journal Publications [CE] |
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