Enhanced Activated Sludge Minimization by Promoting Increased Maintenance Metabolism via Holding Tank Ultrasound Treatment

通过储罐超声波处理促进增加维护代谢，增强活性污泥最小化

• 批准号: 4380-2013
• 负责人: Kennedy, Kevin
• 金额: $ 2.04万
• 依托单位: University of Ottawa
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Individual
• 财政年份: 2016
• 资助国家: 加拿大
• 起止时间: 2016-01-01 至 2017-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=592785
• 关键词: Enhanced; Activated; Sludge; Minimization; Promoting

The aerobic activated sludge process (ASP) is the most commonly used technology for biological treatment of municipal carbonaceous wastewaters. While aerobic treatment of municipal wastewater is robust and has been successfully applied at countless treatment facilities around the world its main drawback is the production of large quantities of excess sludge (EXS). On average a conventional ASP produces about 80 kg of dry EXS for every 1000 m3 of wastewater treated, with the EXS being traditionally disposed of by anaerobic digestion followed by land application or landfilling . However, modern capacity restraints and stringent environmental regulations as well as costs make these options unsustainable solutions moving forward. For example, City of Ottawa currently generates 43.6 dry tonnes of EXS per day every day, with the total cost for sludge treatment and disposal being as high as 40-65% of the total operating cost of conventional wastewater treatment plants (Perez-Elvira, et al., 2006). The ideal solution to alleviate both cost and sludge treatment capacity problems would be the direct reduction of EXS within the activated sludge process. The proposed study is unique and blends the benefits and potential synergistic effects of (1) promoting and selecting for lower biomass producing facultative microbes in the ASP via an anaerobic holding tank (HT), and (2) applying high or low intensity ultrasound (US) treatment to a portion of the HT sludge. High intensity US increases cell lysis and solubilisation to promote cryptic growth and lower biomass yields while low intensity US treatment will wound the microbial cells diverting energy to maintenance metabolisms and away from assimilative growth that will also lead to an overall reduction of new biomass sludge. The goal of combining these beneficial systems to reduce excess sludge will be assessed by investigating a novel modified version of the continuous ASP which integrates an anerobic HT with post-sonication treatment in the sludge recycle line prior to recycling back to the ASP aeration basin. Final effluent quality and important residual sludge characteristics such as dewaterability and settleability will be used to assess the quality of the sludge produced by the proposed treatment systems. Additionally, in order to understand the roles of microbial shift, cryptic growth and enhanced maintenance metabolism within the HT + US modified ASP the process will also be monitored at the microbial level at each step (HT, post US, ASP). A combination of microbial viability, activity and stress tests will be used, as well as molecular fingerprinting, population sequencing and scanning electron microscopy to characterize floc morphology will be applied to ultimately characterize microbial ecological changes.

有氧活性污泥工艺（ASP）是最常用的城市碳质废水生物处理技术。虽然对市政废水的有氧治疗方法很强，并且已成功地应用于世界各地的无数治疗设施，但其主要缺点是生产大量过量污泥（EXS）。平均而言，常规ASP每1000平方米的废水处理约80千克干燥的EXS，传统上由厌氧消化处理，然后是土地应用或垃圾填充。但是，现代能力限制和严格的环境法规以及成本使这些选择不可持续的解决方案向前迈进。例如，渥太华市目前每天每天产生43.6吨干吨的EXS，污泥处理和处置的总成本高达常规废水处理厂的总运营成本的40-65％（Perez-Elvira等人，等，2006）。减轻成本和污泥处理能力问题的理想解决方案是在激活污泥过程中直接减少EXS。拟议的研究是独特的，并将（1）通过厌氧固定罐（HT）促进和选择较低的生物质生物量生物量产生辅助微生物的好处和潜在协同作用，以及（2）对HT污泥的一部分应用高强度超声（US）治疗。高强度US增加了细胞裂解和溶解度，以促进隐性生长和较低的生物量产量，而低强度的美国治疗将伤害微生物细胞将能量转移到维持代谢上，并远离同化生长，这也将导致新的生物质量污泥的总体降低。结合这些有益系统以减少过量污泥的目的将通过研究连续的ASP的新修改版本来评估，该版本将厌氧HT与污泥回收线中的厌氧HT和隔音后处理相结合，然后再回收回ASP曝气盆地。最终的废水质量和重要的残留污泥特性（例如脱水性和沉降性）将用于评估拟议的治疗系统产生的污泥的质量。此外，为了了解微生物转移的作用，在HT + US修改的ASP中，神秘的生长和增强的维持代谢，该过程也将在每个步骤（HT，ht，US，ASP）的微生物水平上进行监测。将使用微生物生存力，活性和应力测试的结合，以及分子指纹识别，种群测序和扫描电子显微镜以表征FLOC形态的表征，以最终表征微生物生态变化。