Effect of varying environmental conditions on the performance and stability of aerobic granular biomass treating dilute Canadian municipal wastewater

好氧颗粒生物质(AGB)是污水处理和资源化领域的一项较新发展。AGB是多种选择压力的结果，导致选择自聚集的生物质，导致颗粒直径大于0.2毫米。因此，AGB能够快速从处理后的液流中分离出来(由于颗粒的快速沉降速度)，并允许在颗粒内形成不同的微生物群落，从而提供了同时去除废水中碳、氮和磷污染物的能力。在实践中，这些优势转化为减少运营占用空间、显著节省能源和降低资本投资。目前，该技术的实验室规模、中试和全面实施利用序批式反应器(SBR)处理高浓度(600至1000 mg/L COD)合成废水、市政废水和工业废水。相比之下，在加拿大的情况下，废水的浓度通常较低(200300 mg/L化学需氧量)。本研究的目标是1)了解浓度较低的加拿大城市污水对AGB系统性能的影响，2)了解加拿大城市污水的进水结构(塞流和完全混合)的影响，以及3)构建和验证概念上的连续流AGB系统。这项研究的结果将对开发能够在加拿大范围内运行的AGB系统的扩大工作至关重要。

Aerobic Granular Biomass (AGB) is a relatively new development in the field of wastewater treatment and resource recovery. AGB is a result of a multitude of selective pressures inducing the selection of self-aggregating biomass, which results in granules greater than 0.2 mm in diameter. As a result, AGB is able to be quickly separated from the treated liquid stream (due to the fast settling velocity of the granules), and allows for a diverse microbial community to develop within the granules, thereby providing the ability for simultaneous removal of carbon, nitrogen, and phosphorus pollutants from wastewater. In practice, these benefits translate to a reduced operational footprint, significant energy savings, and lower capital investment. Currently lab-scale, pilot-scale, and full-scale implementations of the technology utilize sequencing batch reactors (SBRs) to treat high strength (600 to 1000 mg/L COD) synthetic, municipal, and industrial wastewater. In contrast, the wastewater seen in a Canadian context, is typically of lower strength (200 to 300 mg/L COD). The proposed objectives of this study are to 1) understand the effect of lower strength Canadian municipal wastewater on AGB system performance, 2) understand the effect of feeding configuration (plug flow vs. completely mixed) with Canadian municipal wastewater, and 3) construct and validate a conceptual continuous flow AGB system. The findings of this study will be vital for scale-up work for developing an AGB system capable of performing in a Canadian context.