Temperature phased anaerobic digestion with side-stream archaea enrichment for Lulu Island wastewater treatment plant digester upgrade

露露岛污水处理厂消化池升级的温度分阶段厌氧消化和侧流古菌富集

• 批准号: 530065-2018
• 负责人: Eskicioglu, CigdemC
• 金额: $ 6.06万
• 依托单位: University of British Columbia
• 依托单位国家: 加拿大
• 项目类别: Collaborative Research and Development Grants
• 财政年份: 2022
• 资助国家: 加拿大
• 起止时间: 2022-01-01 至 2023-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=761722
• 关键词: Temperature; phased; anaerobic; digestion; side

Waste sludge processing at wastewater treatment plants (WWTPs) represents one of the major challenges, often costing more than the treatment and discharge of the liquid stream. Among several waste sludge treatment options, anaerobic digestion (AD) has proven to be an effective technology. AD is essentially a bioreactor that induces microorganisms to form volatile fatty acids and methane, supplied through the introduction of organic matter such as sewage sludge or manure. In addition to generating methane (which can be converted to heat/electricity), the other benefits of AD are the diversion of organic waste from landfills, reduction of solids, pathogens, production of organic fertilizer as well as reduction of GHG emissions. Lulu Island WWTP (Richmond, BC) has been operating two single-stage AD in parallel. Although the process achieves 63% solids reduction, the current configuration does not provide process redundancy when one of the digesters needs to be shut down for maintenance/repair. Moreover, the dewatered digestate qualifies as Class B biosolids with restrictions for land application. For reducing operational risks and intensifying resource recovery, Metro Vancouver is interested in developing next generation AD technologies at their WWTPs. In this project, a dual-stage AD tandem with a side-stream bioaugmentor is proposed as an advanced AD option for increasing solids reduction, upgrading biogas methane composition from the typical 60% to 90% or higher, enhancing digestate dewaterability, and upgrading biosolids from Class B to Class A. The project will also include microbial profiling combined with select multi-omic (DNA and RNA) analyses to gain insight to community structure, activity and function in both conventional and advanced AD configurations. Metro Vancouver has budgeted $1M to integrate and operationalize a pilot-scale AD at Lulu Island Water Resource Recovery Facility and $13M for a plant upgrade to feed biogas into the power grid. Lab-scale results obtained from this project will provide clear direction for the pilot-plant design/built/operation, which will enable the evaluation of advanced AD processes "offline" without risking ongoing operations.

废水处理厂 (WWTP) 的废污泥处理是主要挑战之一，其成本通常高于液流的处理和排放。在多种废污泥处理方案中，厌氧消化（AD）已被证明是一种有效的技术。 AD本质上是一个生物反应器，通过引入污水污泥或粪便等有机物来诱导微生物形成挥发性脂肪酸和甲烷。除了产生甲烷（可转化为热能/电力）之外，厌氧消化的其他好处包括将有机废物从垃圾填埋场转移、减少固体、病原体、生产有机肥料以及减少温室气体排放。露露岛污水处理厂（不列颠哥伦比亚省里士满）一直在并行运行两台单级厌氧消化系统。尽管该工艺实现了 63% 的固体含量减少，但当其中一个消化池需要关闭进行维护/维修时，当前配置无法提供工艺冗余。此外，脱水后的沼渣符合 B 类生物固体的标准，但对土地应用有限制。为了降低运营风险并加强资源回收，大温哥华地区有兴趣在其污水处理厂开发下一代 AD 技术。在该项目中，建议采用带有侧流生物强化器的双级 AD 串联作为先进的 AD 选项，用于增加固体减少、将沼气甲烷成分从典型的 60% 升级到 90% 或更高、增强沼渣脱水性以及升级生物固体从 B 类到 A 类。该项目还将包括微生物分析与选定的多组学（DNA 和 RNA）分析相结合，以深入了解传统和先进 AD 配置中的群落结构、活动和功能。大温哥华地区已预算 100 万美元用于整合和运行露露岛水资源回收设施的试点规模 AD，并预算 1300 万美元用于工厂升级，以将沼气输送到电网。从该项目获得的实验室规模结果将为试点工厂的设计/建造/运营提供明确的方向，这将能够“离线”评估先进的 AD 流程，而不会危及正在进行的运营。