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.

废水处理行业正在越来越多地将重点放在废水中，而不是简单的废水处理，正在经历重大的转变。能源是可以从废水中恢复的重要资源，并且有几个设施旨在运行能源中性过程。同时，生物固体处置是一项主要的运营费用，因为它最多可以使用年度预算的60％。当前的提案旨在通过最大程度地减少生物固醇的生产和脱颖而出的生物甲烷产量来解决这一综合问题。这将在处理废物活化的污泥（WAS）中可以实现，以增强其在厌氧消化中的降解性，尽管操作厌氧消化层Atpsychromi（20°C和较低）温度。臭氧处理将允许以高速率运行Pssingromi厌氧分解酯，这对应于固体保留时间（SRT）等于或下时间20天。除了降低操作温度之外，消化器的操作将不会从典型条件下进行基本修改。 IS的可降解性的增强性将逐渐创造额外的流程能力，这可能会减少水资源回收设施（WRRF）的资本投资。这个新过程将是同类过程中的第一个，将使用ZONE的水解作用来降低消化液的操作温度并直接增加沼气输出，同时降低相对较低的SRT。当前的NSERC-CRD提案与中心国家Enclectrochimie et en Technologies Environmentales（CNET；与CollègeShawinigan的附属机构）提出的NSERC-ARD提案有关。通过拟议项目开发的新过程，该项目将由液化空气及其合作伙伴商业化，可能会为加拿大废水资源恢复行业提供重要的经济和环境利益。它还将在Airliquide及其合作伙伴内创造就业，以商业化，制造和安装新流程。