Identifying N2O formation and emissions from a full-scale partial nitritation reactor

被引：46
作者：
Mampaey, Kris E. [1 ]
De Kreuk, Merle K. [2 ]
van Dongen, Udo G. J. M. [3 ]
van Loosdrecht, Mark C. M. [3 ]
Volcke, Eveline I. P. [1 ]
机构：
[1] Univ Ghent, Dept Biosyst Engn, B-9000 Ghent, Belgium
[2] Waterschap Hollandse Delta, NL-2980 GC Ridderkerk, Netherlands
[3] Delft Univ Technol, Dept Biotechnol, NL-2628 BC Delft, Netherlands
来源：
WATER RESEARCH | 2016年 / 88卷
关键词：
Full-scale measurement; Greenhouse gas; k(L)a monitoring; Nitritation; Nitrous oxide; Wastewater; NITROGEN-OXIDES EMISSION; ACTIVATED-SLUDGE; SHARON PROCESS; NITRIC-OXIDE; GAS; REMOVAL; ANAMMOX; WATER; NITRIFICATION; OXIDATION;
D O I：
10.1016/j.watres.2015.10.047
中图分类号：
X [环境科学、安全科学];
学科分类号：
08 ; 0830 ;
摘要：
In this study, N2O formation and emissions from a full-scale partial nitritation (SHARON) reactor were identified through a three-weeks monitoring campaign during which the off-gas was analysed for N2O O-2, CO2 and NO. The overall N2O emission was 3.7% of the incoming ammonium load. By fitting the N2O emission to a theoretical gas stripping profile, the N2O emissions could be assigned to aerobically formed N2O and N2O formed under anoxic conditions. This was further substantiated by liquid N2O measurements. Under standard operation, 70% of the N2O emission was attributed to anoxic N2O formation. Dedicated experiments revealed that low dissolved oxygen concentrations (<1.0 g O-2.m(-3)) and longer anoxic periods resulted in an increased N2O emission. Minimising or avoiding anoxic conditions has the highest effect in lowering the N2O emissions. As an additional result, the use of the off-gas N2O concentration measurements to monitor the gas liquid mass transfer rate coefficient (k(L)a) during dynamic reactor operation was demonstrated. (C) 2015 Elsevier Ltd. All rights reserved.
引用
收藏
页码：575 / 585
页数：11
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