Enhancing Anaerobic Digestion of Waste Activated Sludge

强化废弃活性污泥的厌氧消化

• 批准号: 183605-2012
• 负责人: Parker, Wayne
• 金额: $ 1.75万
• 依托单位: University of Waterloo
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Individual
• 财政年份: 2018
• 资助国家: 加拿大
• 起止时间: 2018-01-01 至 2019-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=661615
• 关键词: Enhancing; Anaerobic; Digestion; Waste; Activated

This proposal addresses a study of the integration of waste activated sludge (WAS) pretreatment technologies with anaerobic membrane bioreactors (AnMBR) for enhanced sludge digestion. AnMBRs decouple the hydraulic residence time from the solids residence time and have been found to achieve substantial solids destruction at high organic loading rates while producing a thickened product. It is hypothesized that pretreatment of the sludges would allow for even greater AnMBR throughput. The process would be more stable than the use of continuous flow stirred tank reactors for digestion and would achieve pathogen reduction that is similar to conventional anaerobic digestion due to**the extended solids residence times. Hence, this integration has the potential to substantially reduce the capital and operating costs associated with sludge digestion while maintaining stable operation and production of a high quality digestion product. There are, however, issues associated with system integration, membrane fouling and simulation that need to be addressed before the integration of these technologies will be accepted in practice. Pretreatment (i.e. intensity) and digestion (i.e. hydraulic residence time and solids residence time) conditions need to be optimized for an integrated system. The potential for enhanced membrane fouling with pretreated sludges is of concern because of the increased colloidal matter that is often generated in pretreatment processes. Simulation of pretreatment and digestion has received little attention and hence it is currently challenging to analyze and design these systems without conducting costly pilot testing. The objectives of the proposed project are to:**1.) Optimize the combined use of hydrogen peroxide (H2O2) and ultrasound as an innovative pretreatment to maximize AnMBR throughput and minimize membrane fouling**2.) Optimize AnMBR parameters for integrating pre-treatment with AnMBR digestion**3.)Further develop models of sludge pre-treatment and AnMBR digestion******

本研究旨在探讨将活性污泥预处理技术与厌氧膜生物反应器（AnMBR）相结合以强化污泥消化的可行性。AnMBR将水力停留时间与固体停留时间分离，并且已经发现在高有机负载率下实现实质性的固体破坏，同时产生增稠的产物。据推测，污泥的预处理将允许更大的AnMBR吞吐量。该方法将比使用连续流搅拌罐反应器进行消化更稳定，并且由于延长的固体停留时间，将实现与常规厌氧消化类似的病原体减少。因此，这种整合有可能大大降低与污泥消化相关的资本和运营成本，同时保持稳定的操作和高质量消化产品的生产。然而，有一些问题与系统集成，膜污染和模拟，需要解决这些技术的集成之前，将在实践中被接受。预处理（即强度）和消化（即水力停留时间和固体停留时间）条件需要针对集成系统进行优化。由于预处理过程中经常产生的胶体物质的增加，预处理污泥增强膜污染的可能性是令人关注的。预处理和消化的模拟很少受到关注，因此，在不进行昂贵的中试测试的情况下分析和设计这些系统目前具有挑战性。本项目的目标是：**1。优化过氧化氢（H2O2）和超声波的组合使用，作为一种创新的预处理，以最大限度地提高AnMBR的吞吐量，并最大限度地减少膜污染 **2.）优化AnMBR参数，将预处理与AnMBR消化相结合 **3.）进一步开发污泥预处理和AnMBR消化模型 **