Examination of Disinfectant Residual Decay and Organochloramine Formation in Drinking Water Distribution Systems

饮用水分配系统中消毒剂残留腐烂和有机氯胺形成的检查

• 批准号: 558426-2020
• 负责人: Andrews, Robert
• 金额: $ 2.6万
• 依托单位: University of Toronto
• 依托单位国家: 加拿大
• 项目类别: Alliance Grants
• 财政年份: 2021
• 资助国家: 加拿大
• 起止时间: 2021-01-01 至 2022-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=721719
• 关键词: Examination; Disinfectant; Residual; Decay; Organochloramine

Disinfectants such as chlorine or chloramine are added to treated drinking water prior to entering a distribution system to protect against pathogen intrusion, biological regrowth and to ultimately ensure that consumer's receive safe water. Due to the potential extended periods of time that water spends in a distribution system and associated interactions with pipe materials, water quality often changes from when it leaves a treatment plant to when it is consumed. The Town of Newmarket has experienced issues maintaining a sufficient disinfectant residual throughout their distribution system, which has led to costly maintenance activities and accelerated their pipeline replacement. To-date, more than $1-million has been spent to mitigate this issue. Mechanisms responsible for disinfectant decay must be better understood such that effective remediation plans may be developed.The proposed research will examine the decay and speciation of disinfectant residual in the Newmarket distribution system as a function of water chemistry, pipewall interactions, temperature and hydraulic conditions. To facilitate this research, the Drinking Water Research Group at the University of Toronto has designed pipe section reactors that are capable of replicating distribution system conditions such that these issues may be evaluated under controlled conditions in a lab. To validate and confirm results pipe section reactors will be operated in parallel to pipeloop systems which will be continuously fed with water from the distribution system. Application of this methodology will allow us to identify specific mechanisms responsible for accelerated monochloramine decay in distribution systems and to ultimately provide guidance for future operation and maintenance activities.

在进入分配系统之前，将氯或氯胺等消毒剂添加到经过处理的饮用水中，以防止病原体入侵和生物再生，并最终确保消费者获得安全的水。由于水在分配系统中停留的时间可能较长，以及与管道材料的相互作用，水质从离开处理厂到被消耗之间经常发生变化。纽马基特镇在整个分配系统中保持足够的消毒剂残留量方面遇到了问题，这导致了昂贵的维护活动并加速了管道更换。迄今为止，已花费超过 100 万美元来缓解这一问题。必须更好地了解消毒剂腐烂的机制，以便制定有效的修复计划。拟议的研究将检查纽马克特分配系统中消毒剂残留的腐烂和形态，作为水化学、管壁相互作用、温度和水力条件的函数。为了促进这项研究，多伦多大学的饮用水研究小组设计了能够复制分配系统条件的管段反应器，以便可以在实验室的受控条件下评估这些问题。为了验证和确认结果，管段反应器将与循环管道系统并行运行，循环管道系统将持续从分配系统供水。应用这种方法将使我们能够确定导致分配系统中一氯胺加速衰减的具体机制，并最终为未来的运营和维护活动提供指导。