In-situ restoring nitrogen removal for the combined partial nitritation-anammox process deteriorated by nitrate build-up
作者： Yuanyue Wang , Yawei Wang , Yuansong Wei , Meixue Chen
DOI: 10.1016/J.BEJ.2015.02.028
关键词:
摘要: Abstract The nitrogen removal performance in the combined partial nitritation-anammox (CPNA) process was seriously deteriorated by nitrate build-up. purpose of this study to develop and optimize an in-situ restoring strategy based on hydroxylamine (NH 2 OH) dosing solids retention time (SRT) control for CPNA process. Results showed that 0.55 kgN m −3 d −1 rate could be recovered 20 mgNH OH L 40 days SRT control, concentration effluent decreased from highest 548.4 mgN L during deterioration 65.1 mgN L after restoration, ratio NO 3 − -N produced /NH 4 + consumed one SBR cycle reduced 87.0% 9.13% finally. inhibition nitrite-oxidizing bacteria (NOB) NH OH alone reversible because build-up occurred again 106.9 287.6 mgN L within just 11 stopped. evolution anammox bacteria, ammonium-oxidizing (AOB) NOB quantitative PCR (qPCR) assays verified changes proved restoration successfully solve problem
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