期刊
ENVIRONMENTAL SCIENCE & TECHNOLOGY
卷 54, 期 9, 页码 5822-5831出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.est.9b06404
关键词
-
资金
- European Commission Horizon 2020 Program through Marie Curie Individual Fellowship [N2OPNA-708592]
- Flanders Innovation and Entrepreneurship Agency [IWT-SBO ProCure project by IWT-SBO ProCure and internal Uantwerpen funding) [IWT/50052]
Nitrite oxidizing bacteria (NOB) and nitrous oxide (N2O) hinder the development of mainstream partial nitritation/anammox To overcome these, endogenous free ammonia (FA) and free nitrous acid (FNA), which can be produced in the sidestream, were used for return-sludge treatment for two integrated-film activated sludge reactors containing biomass in flocs and on carriers. The repeated exposure of biomass from one reactor to FA shocks had a limited impact on NOB suppression but inhibited anammox bacteria (AnAOB). In the other reactor, repeated FNA shocks to the separated flocs failed to limit the system's nitrate production since NOB activity was still high on the biofilms attached to the unexposed carriers. In contrast, the repeated FNA treatment of flocs and carriers favored aerobic ammonium-oxidizing bacteria (AerAOB) over NOB activity with AnAOB negligibly affected. It was further revealed that return-sludge treatment with higher FNA levels led to lower N2O emissions under similar effluent nitrite concentrations. On this basis, weekly 4 h FNA shocks of 2.0 mg of HNO2-N/L were identified as an optimal and realistic treatment, which not only enabled nitrogen removal efficiencies of similar to 65% at nitrogen removal rates of similar to 130 mg of N/L/d (20 degrees C) but also yielded the lowest cost and carbon footprint.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据