期刊
BIORESOURCE TECHNOLOGY
卷 337, 期 -, 页码 -出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2021.125496
关键词
Continuous biofilter anammox reactor (CBAR); Low-concentration nitrogen wastewater; Anammox; Short hydraulic retention time; Moderate temperature
资金
- Key Research and Development Program of Shaanxi Province [2021ZDLSF05-04]
- Science and technology innovation demonstration project of social development of Xi'an Science and Technology Bureau [20SFSF0011]
By shortening the hydraulic retention time, it is possible to effectively restart the continuous biofilter anammox reactor and efficiently remove low-concentration nitrogen wastewater.
The high-rate nitrogen removal in a continuous biofilter anammox reactor (CBAR) was investigated to treat lowconcentration nitrogen wastewater. Shortening hydraulic retention time (HRT) gradually could restart CBAR and accumulate anammox bacteria effectively in the reactor, where the carmine anammox granular sludge and biofilm were coexisted well. It spent 21 days to restart CBAR completely after it had been idle for 116 days. Meanwhile, the total nitrogen removal rate remained stable at 86.42% accompanied with a total biomass concentration of 26.02 g-SS/L in 0 - 20 cm zone under nitrogen loading rate of 4.25 +/- 0.10 kg-N/(m3 center dot day), HRT of 20 min and 25 degrees C. In addition, the specific anammox activity of biomass exceeded 0.28 g-N/(g-VSS center dot day) in 0 20 cm zone, which was related with a high relative abundance of Candidatus Brocadia (>30%) in the same zone. Thus, it is a feasible approach to adopt CBAR to treat low-concentration nitrogen wastewater efficiently.
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