无纺布-生物反应器快速启动厌氧氨氧化脱氮工艺

Rapid Start-up of Anammox Denitrification Process in a Novel Nonwoven Bioreactor

该研究结合生物膜、膜生物反应器和厌氧氨氧化工艺(Anammox),设计了以无纺布为载体的双功能无纺布-生物反应器,无纺布过滤组件兼具生物膜载体和固液分离的双重功能,应用于Anammox工艺中实现高效脱氮。长期监测表明,反应器的氮去除率达到约1.02 kg/(m3·d()以N计)。反应器的出水NH4+-N和NO2--N浓度都始终低于悬浮溶液中上清液的浓度,反应器总氮脱除主要通过接触传质过程,总氮去除率占60%以上;而通过强化传质过程,总氮去除率达到20%~30%。随着进水氮浓度的提升,通过强化传质作用的脱氮效率也逐步提升,当总氮进水浓度为600 mg/L(以N计)时,去除率达到最大30%。此外,在193 d的运行过程中,膜污染现象未出现。

In this study,a novel non-woven Anammox bioreactor that combines the advantages of conventional biofilm,membrane bioreactors(MBRs)and Anammox was developed.Non-woven fabric is utilized as the main part of the membrane modules as filtration membrane and biomass media simultaneously.Long-term monitoring suggests that the nitrogen removal rates(NRR)of the reactor reached ca.1.02 kg/(m3·d).The NH4+-N and NO2--N concentrations of effluent are always lower than the supernatant in the reactor.Based on the result,the free surface transfer roles as the main part of the nitrogen removal rate,with above 60%,while the enhanced mass transfer contributes about 20%to 30%of the nitrogen removal rate.The denitrification of enhanced mass transfer is gradually improved as the increase of influent nitrogen concertation.The removal rate reaches 30%once the total nitrogen influent concertation is 600 mg/L.In addition,non-fouling state appears during 193 days of operation.