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首页> 外文会议>Annual Water Environment Federation technical exhibition and conference >Performance and Microbial Ecology of a Low Temperature (15°C) Mainstream Anammox Moving Bed Biofilm Reactor (MBBR) Process
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Performance and Microbial Ecology of a Low Temperature (15°C) Mainstream Anammox Moving Bed Biofilm Reactor (MBBR) Process

机译：低温（15°C）主流厌氧氨氧化移动床生物膜反应器（MBBR）工艺的性能和微生物生态

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With the advantage of providing WWTPs the ability toward energy neutrality, mainstream nitrogen removal using anammox (anaerobic ammonium oxidization) based technologies has been increasingly explored these days. However, the decreased bacteria activities under temperature <20°C could reduce the nitrogen removal efficiency, which remains as a key issue for successful mainstream applications (Gilbert, Agrawal et al. 2014, Lackner, Welker et al. 2015). Enriched biomass with high AnAOB (anaerobic ammonium oxidization bacteria) ratio within the mainstream process was proved effective to mitigate the negative impact of low temperatures. Thus far, most documented studies of mainstream operation was initially direct seeding either with granular or biofilm biomass from sidestream deammonification/anammox (combining partial nitritation and anammox) processes, which are typically operated at higher temperatures (>30°C) and influent nitrogen loadings. In this study, a different enrichment method was applied, which entailed continuously feeding a mainstream MBBR (operated at 15±1°C) with the effluent from a sidestream deammonification MBBR (operated at 35±1°C). By connecting the two reactors, the suspension biomass from the sidestream MBBR was transferred into mainstream anammox MBBR, so as to seed the mainstream reactor, and to enrich biofilm biomass under low temperature directly. The specific objectives in this study were to characterize the performance and microbial ecology of the enriched low-temperature mainstream anammox MBBR relative to that of the sidestream deammonification MBBR. As the results showed, successful enrichment was observed in the mainstream biofilms with a biomass concentration increased from 0.33 + 0.08mgCOD/carrier to 0.80 ± 0.05mgCOD/ carrier within 6 months. Microbial ecology in both sidestream and mainstream was analyzed through the next-generation sequencing technologies targeting 16S rRNA region. The sequencing data indicated a similar spatial distribution and microbial diversity of three major bacteria between sidestream and mainstream reactors. An extremely high fraction (>50%) of Candidates "Kuenenia" related bacteria was founded to dominate the biofilm population in mainstream reactor, and an average fraction of 54.3 ± 9.38% of Nitrospira was presented in the suspensions. The overall results suggested this connecting method a good way for mainstream biomass enrichment.
机译：如今，利用污水处理厂实现能源中和的优势，利用厌氧氨水（厌氧铵氧化）技术的主流脱氮技术已得到越来越多的研究。然而，在<20°C的温度下细菌活性下降可能会降低脱氮效率，这仍然是成功的主流应用的关键问题（Gilbert，Agrawal等人，2014; Lackner，Welker等人，2015）。事实证明，主流工艺中富含AnAOB（厌氧铵氧化细菌）比例的生物质能有效缓解低温的负面影响。到目前为止，大多数文献记载的主流操作研究最初都是直接采用侧流脱氨/厌氧氨化（结合部分硝化和厌氧氨氮）工艺的颗粒状或生物膜生物质直接播种，该工艺通常在较高温度（> 30°C）和进水氮负荷下进行。 。在这项研究中，应用了一种不同的富集方法，该方法需要用侧流脱氨MBBR（在35±1°C下运行）的出水连续地供入主流MBBR（在15±1°C下运行）。通过连接两个反应器，将来自侧流MBBR的悬浮生物质转移至主流厌氧型MBBR中，以播种主流反应器，并直接在低温下富集生物膜生物质。这项研究的具体目标是表征相对于侧流脱氨MBBR的浓缩低温主流厌氧氨氧化MBBR的性能和微生物生态学。结果表明，在6个月内，主流生物膜中成功富集，生物质浓度从0.33 + 0.08mgCOD /载体增加到0.80±0.05mgCOD /载体。通过针对16S rRNA区域的下一代测序技术，对侧流和主流的微生物生态学进行了分析。测序数据表明侧流反应器和主流反应器之间三种主要细菌的空间分布和微生物多样性相似。建立了极高比例（> 50％）的“ Kuenenia”相关细菌候选人，以控制主流反应器中的生物膜种群，悬浮液中平均存在54.3±9.38％的硝化螺菌。总体结果表明，这种连接方法是主流生物质富集的好方法。

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