Optimizing silicate formulation and dose for lead and biofilm control in drinking water

加拿大卫生部最近提议修改饮用水中铅的指导方针。这些变化将使饮用水中铅的最大可接受浓度降至5微克/L，并指定用于确定住宅和非住宅建筑中铅水平的采样方案。*尽管水务行业总体上观察到了将磷酸盐作为一种化学产品用于腐蚀控制的积极成果，但挑战依然存在。具体的挑战包括对磷酸盐在生物膜形成中可能发挥的作用以及磷酸盐在市场上的长期可获得性的关注。硅酸盐是几十年来在饮用水工业中用于铁和锰控制的一种替代品；然而，在同行评议文献中，它们在饮用水中用于腐蚀控制的报道相对有限。*国家硅酸盐公司发现了一个机会，可以利用水务行业更好地了解腐蚀控制产品的需求，以解决对铅和其他金属的担忧。目前发表的关于硅酸盐的研究相对较少，无论是在应用上还是在基础水平上都是如此。因此，该项目旨在缩小这一差距。*这一为期24个月的项目的总体目标是加强水界对硅酸钠用于控制饮用水分配系统中的铅和生物膜的了解。该研究项目将利用国家硅酸盐公司为饮用水行业设计的新产品配方。该研究项目将在实验室规模和试点规模两个层面上进行，以便从基础和应用两个层面了解硅酸钠。********

Health Canada has recently proposed changes to the guideline for lead in drinking water. These changes would reduce the maximum acceptable concentration of lead in drinking water to 5 µg/L and specify sampling protocols for determining lead levels in residential and non-residential buildings.****While the water industry, in general, has observed positive outcomes with phosphate as a chemical product for corrosion control, challenges remain. Specific challenges include concern for the role phosphates may play in biofilm formation and the long-term availability of phosphates in the marketplace. Silicates are an alternative that have been used in the drinking water industry for iron and manganese control for decades; however, their reported application for corrosion control in drinking water has been relatively limited in the peer review literature. ****National Silicates has identified an opportunity to capitalize on the need in the water industry to better understand corrosion control products to address concerns with lead and other metals. There are presently relatively few published studies concerning silicates, both in application and at a fundamental level. Accordingly, this project aims to close that gap.****The overall goal of this 24-month project is to enhance the water community's understanding of sodium silicates for controlling lead and biofilms in drinking water distribution systems. The research project will utilize a new product formulation provided by National Silicates designed for the drinking water industry. The research project will be conducted at the laboratory-scale level and the pilot-scale level to obtain an understanding of sodium silicates at both a fundamental and applied level. ********