SGER: Enhanced Wastewater Nitrification Using Selective Detachment, Recovery, and Recycling of Nitrifying Bacteria

阿勒曼废水硝化被认为是一种高度敏感的生物过程，因为所涉及的细菌具有代谢性质（例如，低增长率等）和相应的低细胞群体。 此外，这些硝化菌在反应器的必要废污泥流中的每日损失对可维持的硝化菌的允许量产生了实际限制。 这项研究的重点是一种创新的方法，通过选择性地从废污泥中分离和回收这些有价值的硝化菌，使它们可以再循环使用，从而使硝化菌的数量超过传统系统。 与其基于化学的附着（通过粘附性胞外聚合物）和絮凝行为不提供这种灵活性的异养细胞相比，我们认为可以促使附着的硝化细胞在适当的激励环境中分离和反絮凝。 潜在的机制随后将是受控的化学、物理和/或电效应，其诱导包含在废物污泥内的附着的硝化细胞分离和反絮凝，此时这些离散的硝化菌然后可以与剩余的废物污泥分离以用于随后的再利用。 因此，这种能力将有助于以独立于剩余混合培养物SRT的方式控制（并有益地提高）硝化菌固体保留时间（SRT）的手段。***

0137330 Alleman Wastewater nitrification is considered to be a highly sensitive biological process given the metabolic nature of the involved bacteria (e.g., low growth rate, etc.) and correspondingly low cell population. Furthermore, the daily loss of these nitrifiers within a reactor's necessary waste sludge stream creates a pragmatic limitation on the permissible amount of nitrifiers that can be maintained. This proposed research focuses on an innovative means to beneficially increase the population of nitrifiers beyond that of conventional systems by selectively detaching and recovering these valuable nitrifiers from the waste sludge such that they can then be recycled back into use. As compared to heterotrophic cells whose chemical-based attachment (via an adhesive exocellular polymer) and flocculation behavior does not afford this flexibility, we believe that attached nitrifying cells can be prompted to detach and deflocculate within a suitably motivating environment. The underlying mechanism would subsequently be that of a controlled chemical, physical, and/or electrical effect which induces attached nitrifying cells contained within the waste sludge to detach and deflocculate, at which point these discrete nitrifiers can then be separated from the remaining waste sludge for subsequent reuse. As such, this capability would then facilitate a means of controlling (and beneficially raising) the nitrifier solids retention time (SRT) in a fashion that is independent from that of the remaining mixed-culture SRT. ***