Anaerobic Digestion of Waste Activated Sludge at Psychrophilic Temperatures with Ozonation to Reduce Biosolids Production and Enhance Energy Recovery

在嗜冷温度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: 504781-2016
• 负责人: Milette, Éric
• 金额: $ 5.46万
• 依托单位: Collège Shawinigan
• 依托单位国家: 加拿大
• 项目类别: Applied Research and Development Grants - Level 2
• 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=641357
• 关键词: Anaerobic; Digestion; Waste; Activated; Sludge

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

废水处理行业正在经历一场重大变革，越来越关注废水资源回收，而不是简单的废水处理。能源是一种重要的资源，可以从废水中回收，一些设施旨在运行能源中性过程。同时，生物固体处理是一项主要的运营费用，因为它可以使用高达60%的设施年度预算。目前的建议旨在通过最大限度地减少生物固体的产生和最大限度地提高生物甲烷的产量来解决这个综合问题。这将通过用丙酮处理废弃活性污泥（WAS）来提高其在厌氧消化中的可降解性，并通过在低温（20°C或更低）下操作厌氧消化器来实现。臭氧处理将使厌氧消化器以高速率运行，这相当于固体滞留时间（SRT）等于或低于20天。因此，除了操作温度降低之外，蒸煮器的操作将不会从典型条件大幅度改变。WAS可降解性的增强也将潜在地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。这种新工艺将是同类工艺中第一个利用臭氧的水解作用来降低沼气池操作温度，直接增加沼气产量，同时保持相对较低的SRT。目前的NSERC-CRD提案是与美国国家科学技术与环境中心（CNETE，隶属于Shawinigan学院）提出的NSERC-ARD提案联合提出的。通过该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，可能为加拿大废水资源回收行业提供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的商业化、制造和安装新工艺创造就业机会。