Dependence of enhanced biological nitrogen removal on carbon to nitrogen and rbCOD to sbCOD ratios during sewage treatment in sequencing batch reactor

Khursheed, A. and Gaur, R.Z. and Sharma, M.K. and Tyagi, V.K. and Khan, A.A. and Kazmi, A.A. (2018) Dependence of enhanced biological nitrogen removal on carbon to nitrogen and rbCOD to sbCOD ratios during sewage treatment in sequencing batch reactor. Journal of Cleaner Productionq, 171. pp. 1244-1254. ISSN 9596526

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Abstract

Carbon to nitrogen ratio (C/N) is not the lone limiting factors in biological nutrient removal from municipal wastewaters, but readily biodegradable to slowly biodegradable COD ratio (rbCOD/sbCOD) inter alia governs the process of nutrient removal. An intermittent aeration pre-anoxic sequencing batch reactor was operated at C/N ratio of 3, 7.5, and 10 and at rbCOD/sbCOD ratios of 0.1, 0.25, and 0.5 at different sludge internal recirculation ratios. The increasing trend in nitrogen removal was observed with above mentioned operating parameters. At high C/N and rbCOD/sbCOD ratio of 10 and 0.5 the maximum total nitrogen (TN) removal was 90.7% giving 3.8 mg/L TN in the effluent out of 30 mg/L in the influent. At average sewage quality consisting of C/N and rbCOD/sbCOD ratio of 7.5 and 0.25; the TN removal was not more than 83%. The specific nitrate removal rate varied from 0.010 to 0.022 gNO3 -/gVSSa.d (0.015 ± 0.0013) at C/N ratio of 3.0, 0.013–0.018 gNO3 -/gVSSa.d (0.017 ± 0.0011) at 7.5 and 0.013–0.015 gNO3 -/gVSSa.d (0.014 ± 0.001) at 10. The increase in specific nitrate removal rate was coherent to high rbCOD/sbCOD ratio but as the C/N increased to 10 this effect was nullified. The result conformed to defined stoichiometric model based on C/N, rbCOD/sbCOD and sludge internal recirculation ratios. It will help in further effluent polishing with respect to nutrient removal to achieve desired treated wastewater quality.

Item Type: Article
Uncontrolled Keywords: Carbon to nitrogen ratio; Enhanced nitrogen removal; rbCOD; sbCOD
Subjects: T Technology > T Technology (General)
Divisions: Faculties > Faculty of Engineering and Technology > Zakir Husain College of Engineering & Technology > Department of Civil Engineering
Depositing User: AMU Library
Date Deposited: 20 Jan 2018 06:46
Last Modified: 20 Jan 2018 06:46
URI: http://ir.amu.ac.in/id/eprint/10885

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