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。这些变化将把饮用水中铅的最大可接受浓度降低到5微克/升，并具体规定了用于确定住宅和非住宅建筑物中铅含量的采样协议。虽然水行业总体上已经观察到磷酸盐作为腐蚀控制化学产品的积极成果，但挑战仍然存在。具体的挑战包括关注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用性。硅酸盐是一种替代品，几十年来一直用于饮用水行业的铁和锰控制;然而，在同行评审文献中，其在饮用水腐蚀控制中的应用报告相对有限。*National Silicates已经确定了一个机会，可以利用水行业的需求，更好地了解腐蚀控制产品，以解决铅和其他金属的问题。目前关于硅酸盐的应用和基础研究相对较少。因此，本项目旨在缩小这一差距。*这个为期24个月的项目的总体目标是提高水资源社区对硅酸钠控制饮用水分配系统中铅和生物膜的理解。该研究项目将利用National Silicates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中试规模进行，以在基础和应用层面上了解硅酸钠。 ********

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. ********