Modeling the RAS-ozonation process to reduce excess activated sludge production and its effects on the ecophysiology of nitrifiers

模拟 RAS 臭氧化过程以减少过量活性污泥的产生及其对硝化菌生态生理学的影响

• 批准号: 417654-2011
• 负责人: Frigon, Dominic
• 金额: $ 3.13万
• 依托单位: McGill University
• 依托单位国家: 加拿大
• 项目类别: Collaborative Research and Development Grants
• 财政年份: 2013
• 资助国家: 加拿大
• 起止时间: 2013-01-01 至 2014-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=530936
• 关键词: Modeling; RAS; ozonation; process; reduce

The drastic increase in wastewater treatment sludge disposal costs in Quebec and Canada within the last few years drives municipal facilities to look for new technologies to reduce excess sludge production. The ozonation of the return activated sludge (RAS) to partially solubilize the suspended solids organic matter is one innovative and attractive solution since ozone can also be used for breaking down pollutants of emerging concerns such as pharmaceuticals and endocrine disruptors and for effluent disinfection. However, the mechanisms by which ozone reduces excess sludge production and how it affects the stability of the microbial populations responsible for biological treatment, especially fragile ones like nitrifiers, are not well understood. In this study, we will undertake a comprehensive modeling approach for the ozonation process with pilot-scale and lab-scale reactor experiments to determine the impact of RAS ozonation on mixed liquor volatile suspended solids (MLVSS) fractions (biomass vs non-biodegradable), which is paramount to activated sludge modeling. The model will be formulated as an extension of the IWA-ASM3, and it will be used to investigate the interaction with the RAS ozonation process and the plant wastewater treatment process. We will also examine how specific microbial populations such as nitrifiers adapt to the ozonation process at different temperatures and solids retention times (SRTs). In this part of the work, molecular biology techniques will be used to determine microbial population dynamics and genes expression. These data will be used to assess how to properly mathematically parameterize the biochemical transformations.

过去几年，魁北克省和加拿大废水处理污泥处置成本急剧增加，促使市政设施寻找新技术来减少多余污泥的产生。回流活性污泥 (RAS) 的臭氧化可部分溶解悬浮固体有机物，是一种创新且有吸引力的解决方案，因为臭氧还可用于分解新出现的污染物，例如药物和内分泌干扰物，以及用于废水消毒。然而，臭氧减少过量污泥产生的机制以及它如何影响负责生物处理的微生物种群的稳定性，特别是像硝化细菌这样的脆弱微生物，尚不清楚。在这项研究中，我们将通过中试规模和实验室规模的反应器实验对臭氧化过程进行全面的建模方法，以确定 RAS 臭氧化对混合液挥发性悬浮固体 (MLVSS) 部分（生物质与不可生物降解）的影响，这对于活性污泥建模至关重要。 该模型将作为 IWA-ASM3 的扩展，用于研究 RAS 臭氧化过程和工厂废水处理过程的相互作用。我们还将研究特定微生物种群（例如硝化菌）如何适应不同温度和固体保留时间（SRT）下的臭氧化过程。在这部分工作中，分子生物学技术将用于确定微生物种群动态和基因表达。 这些数据将用于评估如何正确地对生化转化进行数学参数化。