Novel enhanced primary treatment (EPT) of combined sewer overflow (CSO) using combinations of oxidants and coagulants

使用氧化剂和混凝剂组合对合流下水道溢流 (CSO) 进行新型强化一级处理 (EPT)

• 批准号: 475302-2014
• 负责人: GamalElDin, Mohamed
• 金额: $ 4.37万
• 依托单位: University of Alberta
• 依托单位国家: 加拿大
• 项目类别: Collaborative Research and Development Grants
• 财政年份: 2015
• 资助国家: 加拿大
• 起止时间: 2015-01-01 至 2016-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=578213
• 关键词: Novel; enhanced; primary; treatment; EPT

Improved municipal water management is a critical element in securing a sustainable ecological future for Canadian lakes and rivers which cover about 12% of the surface area of Canada. Combined sewer overflows (CSOs) contribute a significant amount of pollutants especially at heavy wet weather conditions which may be more frequent in the coming years due to the climate change phenomenon. Current practices of bypassing the CSOs or partially treating these flows through primary treatment enhanced only by coagulants have elevated the concentrations of some parameters like total suspended solids (TSS) and E.coli beyond the regulatory requirements of safe discharge to the river. This violation to the regulatory requirements can pose dangerous consequences to the receiving aquatic environment organisms. In addition to the regulated pollutants, micropollutants (MPs) and nanomaterials (NMs) found at elevated concentrations in CSOs as a result to their extensive usage in a wide range of products can pose risks on humans, fish and other aquatic life. Consequently, their fate and removal mechanisms should be assessed, and strategies to reduce their concentrations prior to their release should be developed. In order to further enhance the treatment of CSOs, there is an essential need to enhance both the settling and the oxidation/ disinfection capabilities in primary sedimentation tanks. Chemical additions considered in this study will include ferrate (Fe(VI)) which is a promising dual oxidant/coagulant and peracetic acid (PAA) as an oxidant applied in conjunction with coagulants such as aluminum sulfate, polyaluminum chloride, or ferric chloride. The proposed NSERC Collaborative Research and Development (CRD) Program will assist decision-makers to adopt sustainable development strategies based on the simulation of actual conditions and the predictions of the impact of different pollutants in CSOs on the environment. As a result of this CRD Program, highly qualified personnel will be trained with multidisciplinary expertise that will strengthen Alberta's and Canada's capacities in wastewater treatment management.

改善市政水管理是确保加拿大湖泊和河流生态未来可持续发展的关键因素，这些湖泊和河流约占加拿大地表面积的12%。由于气候变化现象的影响，在未来几年可能会更加频繁的潮湿天气条件下，合流下水道溢流（cso）会产生大量污染物。目前的做法是绕过公民社会组织或通过仅通过混凝剂加强的初级处理来部分处理这些水流，这使得总悬浮固体（TSS）和大肠杆菌等一些参数的浓度升高，超出了安全排放到河流的监管要求。这种违反监管要求的行为可能对接收的水生环境生物造成危险后果。除了受管制的污染物外，由于在各种产品中广泛使用，在cso中发现的微污染物（MPs）和纳米材料（NMs）浓度升高，可能对人类、鱼类和其他水生生物构成风险。因此，应评估它们的命运和清除机制，并制定在释放前降低其浓度的战略。为了进一步加强对公民社会组织的处理，有必要提高初级沉淀池的沉淀和氧化/消毒能力。本研究中考虑的化学添加剂包括高铁酸盐（Fe(VI)），它是一种很有前途的双重氧化剂/混凝剂，过氧乙酸（PAA）作为氧化剂，与硫酸铝、聚合氯化铝或氯化铁等混凝剂一起使用。拟议的NSERC合作研究与发展（CRD）计划将通过模拟实际情况和预测不同污染物在公民社会组织中对环境的影响，帮助决策者采取可持续发展战略。通过这一CRD计划，高素质的人才将得到多学科专业知识的培训，这将加强阿尔伯塔省和加拿大在废水处理管理方面的能力。