Simultaneous ammonium and nitrate removal by a modified intermittently aerated sequencing batch reactor (SBR) with multiple filling events
Author:
Hajsardar Mehdi1, Borghei Seyed Mehdi2, Hassani Amir Hessam1, Takdastan Afshin3
Affiliation:
1. Islamic Azad University, Department of Environmental Engineering, Science and Research Branch, Tehran, Postal code: 1477893855, Iran (Islamic Republic of) 2. Sharif University of Technology, Department of Chemical and Petroleum Engineering, Tehran, Postal code: 11365/8639, Iran (Islamic Republic of) 3. Ahvaz Jundishapur University of Medical Sciences, Environmental Technologies Research Center, Ahvaz, Postal code: 6135715794, Iran (Islamic Republic of)
Abstract
Abstract
Optimized methods for simultaneous removal of nitrate, nitrite and ammonium are important features of nutrient removal. Nitrogen removal efficiency in an intermittently aerated sequencing batch reactor (IA-SBR) with multiple filling events was studied. No external carbon source was added and three filling events were considered. Oxidationreduction potential (ORP) and pH curve at solids retention time (SRT) of 20 d were analyzed. Effects of three organic loading rates (OLR), 0.67, 1.0 and 1.5 kgCOD/m3d, and three nitrogen loading rates (NLR), 0.054, 0.1 and 0.15 kgN/m3d, on nitrogen removal were studied. Nitrate Apex in pH curve and Nitrate Knee in ORP profile indicated that the end of denitrification would be achieved sooner. The kinetic coefficients of endogenous decay (kd) and yield (Y) were identified to evaluate heterotrophic specific denitrification rate (SDNRb). In period 2 at NLR of 0.054 kgN/m3d and considering 2 anoxic and 3 aerobic phases, nitrogen removal efficiency was 91.43%.
Publisher
Walter de Gruyter GmbH
Subject
General Chemical Engineering,General Chemistry,Biotechnology
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