GOALI: Balancing flocs and granules for activated sludge process intensification: Stoke's vs Fick's Laws

1512667 sturm城市污水处理厂面临越来越大的压力，以满足氮和磷的低排放限制，而老化的基础设施和不断变化的降水模式造成了潮湿的天气负担。一种被称为颗粒污泥应用的新工艺为这些挑战提供了解决方案，因为能够去除营养物质的缓慢生长的微生物种群保持在密集的颗粒中，可以在高负荷和流动条件下保持。在拟议的研究中，将确定颗粒的沉降，以获得最佳颗粒直径和密度，并将研究选择所需颗粒的标准。迄今为止，颗粒污泥单元已在欧洲率先使用柱式顺序间歇式反应器，利用快速沉淀时间和生物质的连续冲洗来维持颗粒污泥，通常导致高流出悬浮物。这种反应器的几何形状和对内部沉降选择的依赖限制了现有污水处理厂采用颗粒技术，这些污水处理厂已经建成了庞大的基础设施，应该在工厂扩建时加以利用。这个建议是根据平衡菲克？s和斯托克？年代法律。PIs假设，当进行发酵预处理时，低强度的城市废水可以提供细胞外聚合物质和颗粒形成所需的易生物降解底物的最低有机表面负荷，以及磷积累生物的选择。虽然目前对颗粒形成的研究主要集中在选择颗粒污泥和选择外絮凝体上，但pi假设：1)平衡两种污泥结构将提供最大的反应器性能，2)应用外部沉降选择器优先保留良好的沉降生物质和PAOs，将减轻柱式颗粒反应器典型的高出水悬浮物负担，并稳定生物除磷。这项研究有可能通过在现有基础设施中开发颗粒污泥的方法来改变美国水务部门。拟议的项目将以促进工业-公用事业-大学与废水行业的合作为中心。DC Water和Hampton Roads环卫区是美国颗粒污泥技术的早期采用者，在过去的五年里，他们在各自的污水处理厂进行了厌氧氨氧化颗粒试验研究。合作项目负责人将举办一个水环境联合会研讨会，促进公用事业与大学的伙伴关系，强调这些伙伴关系如何加快新技术的采用。

1512667SturmMunicipal wastewater treatment plants are under increasing pressure to meet low discharge limits for nitrogen and phosphorus, while aging infrastructure and changing precipitation patterns causes a wet weather burden. A new process, referred to as granular sludge applications, offers a solution to these challenges since slow-growing microbial populations capable of nutrient removal are maintained in dense particles that can be retained under high loading and flow conditions. In the proposed research, settling of the particles will be determined for an optimum granule diameter and density will be investigated and criteria to select for desired particles will be developed.To date, granular sludge units have been pioneered in Europe using column-type sequencing batch reactors that utilize a fast settling time and continuous washout of biomass in order to maintain granular sludge, typically resulting in high effluent suspended solids. This reactor geometry and dependence on internal settling selection limits the adoption of granular technology by existing wastewater treatment plants, which have a tremendous infrastructure already built that should be utilized as plants expand. This proposal is framing sludge particle formation and selection in terms of balancing Fick?s and Stoke?s Law. The PIs hypothesize that low-strength municipal wastewater can supply a minimum organic surface loading of readily-biodegradable substrate required for extracellular polymeric substances and granule formation, as well as the selection of phosphorus accumulating organisms, when a fermentation pretreatment is performed. While current research on granular formation focuses on selecting granular sludge and out-selecting flocs, the PIs hypothesize that: 1) balancing the two sludge structures will provide the maximum reactor performance, and 2) the application of external settling selectors to preferentially retain good settling biomass and PAOs will alleviate the high effluent suspended solids burden typical of column-type granular reactors, and stabilize biological phosphorus removal. The research has the potential to transform the US water sector by developing approaches for granular sludge within existing infrastructure. The proposed project will center on promoting industry-utility-university partnerships to the wastewater profession. DC Water and Hampton Roads Sanitation District have been early adopters of granular sludge technology within the United States, having performed anammox granule pilot research for the past five years at their wastewater treatment plants. The Co-PIs will develop a Water Environment Federation workshop that promotes utility-university partnerships, highlighting how these hasten new technology adoption.