Anaerobic digestion of waste activated sludge at psychrophilic temperatures with ozonation to reduce biosolids production and enhance energy recovery

在低温下通过臭氧化对废弃活性污泥进行厌氧消化，以减少生物固体的产生并增强能量回收

• 批准号: 500865-2016
• 负责人: Frigon, Dominic
• 金额: $ 8.39万
• 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: 2017
• 资助国家: 加拿大
• 起止时间: 2017-01-01 至 2018-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=618196
• 关键词: Anaerobic; digestion; waste; activated; sludge

The wastewater treatment industry is undergoing a major transformation by increasingly focusing on wastewater resource recovery instead of simply wastewater treatment. Energy is an important resource that can be recovered from wastewater, and several facilities aim at operating energy neutral processes. At the same time, biosolids disposal is a major operational expense as it can use up to 60% of a facilities yearly budget. The current proposal aims at tackling this combined problem by both minimizing biosolids production and by maximizing biomethane yields. This will be accomplished though treating waste activated sludge (WAS) with ozone to enhance it degradability in anaerobic digestion, and though operating the anaerobic digesters at psychrophilic (20 °C and lower) temperatures. The ozone treatment will allow the operation of the psychrophilic anaerobic digester at high rates, which corresponds to solids retention time (SRT) equal or lower than 20 days. Thus, beside the decrease in operation temperate, the operation of the digesters will not be modified substantially from the typical conditions. The enhanced degradability of the WAS will also potentially create additional process capacity, which may reduce capital investments for the water resource recovery facilities (WRRF). This new process will be the first of its kind by which the hydrolysis action of ozone will be used to reduce the digester operation temperature and directly increase the biogas output while maintaining a relatively low SRT. The current NSERC-CRD proposal is joint with an NSERC-ARD proposal presented by the Centre National en Électrochimie et en Technologies Environnementales (CNETE; affiliated with the Collège Shawinigan). The new process developed through the proposed project, which will be commercialized by Air Liquide and its partners, will likely provide important economic and environmental benefits to the Canadian wastewater resource recovery industry. It will also generate employment within Air Liquide and its partners for commercializing, manufacturing, and installing the new processes.

废水处理行业正在经历重大转型，越来越关注废水资源回收而不是简单的废水处理。能源是一种可以从废水中回收的重要资源，一些设施旨在运行能源中性工艺。同时，生物固体处置也是一项主要运营支出，因为它可能占用设施年度预算的 60%。目前的提案旨在通过最大限度地减少生物固体产量和最大限度地提高生物甲烷产量来解决这一综合问题。这将通过用臭氧处理废弃活性污泥（WAS）以增强其在厌氧消化中的降解性，并在嗜冷（20°C 或更低）温度下运行厌氧消化器来实现。臭氧处理将使嗜冷厌氧消化器能够高速运行，相当于固体保留时间 (SRT) 等于或低于 20 天。因此，除了运行温度降低之外，消化器的运行不会对典型条件进行实质性修改。 WAS 增强的可降解性还可能创造额外的处理能力，这可能会减少水资源回收设施 (WRRF) 的资本投资。这一新工艺将是同类工艺中的首个，利用臭氧的水解作用来降低沼气池的运行温度，直接增加沼气产量，同时保持相对较低的SRT。当前的 NSERC-CRD 提案与国家电气化学和技术环境中心 (CNETE；隶属于沙维尼根学院) 提出的 NSERC-ARD 提案联合。通过拟议项目开发的新工艺将由液化空气集团及其合作伙伴商业化，可能会给加拿大废水资源回收行业带来重要的经济和环境效益。它还将为液化空气集团及其合作伙伴创造就业机会，以实现新工艺的商业化、制造和安装。