Enhancing Anaerobic Digestion of Waste Activated Sludge

本研究旨在研究将废活性污泥（WAS）预处理技术与厌氧膜生物反应器（AnMBR）相结合，以增强污泥的消化。anmbr将水力停留时间与固体停留时间分离，并在生产增稠产品的同时以高有机负载率实现大量固体破坏。据推测，污泥预处理将允许更大的AnMBR吞吐量。该工艺将比使用连续流搅拌槽反应器进行消化更稳定，并且由于延长了固体停留时间，将实现与传统厌氧消化相似的病原体减少。因此，这种整合有可能大幅降低与污泥消化相关的资本和运营成本，同时保持稳定的运行和高质量消化产品的生产。然而，在这些技术被实际接受之前，还需要解决与系统集成、膜污染和模拟相关的问题。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增加，因此预处理污泥增强膜污染的潜力值得关注。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。建议项目的目标是：**1.)优化过氧化氢（H2O2）和超声联合使用作为一种创新的预处理方法，以最大限度地提高AnMBR的吞吐量并减少膜污染**2。优化AnMBR预处理与AnMBR溶出相结合的参数**3)进一步发展污泥预处理和AnMBR消化模型******

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******