AWWA CEO David LaFrance thanks water professionals nationwide for keeping water safe for drinking
Dec. 16, 2014, marked the 40th anniversary of the Safe Drinking Water Act (SDWA), which today includes regulations for more than 90 contaminants. American Water Works Assn. (AWWA) CEO David LaFrance issued the following statement to mark the occasion.
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How membranes improved water quality in Australian villages
Finding the right housing depends a lot on the application in which the housing will be used. Being familiar with your water filtration needs as well as researching the benefits of various types of housing will help you make the right decision.
The following is part two of a two-part article.
The cartridge often is thought of as the heart of a filter system. However, the cartridge operates within a housing and even a cartridge that is perfectly matched to the application won’t perform adequately if it’s not also matched to a housing that meets the same application requirements. Specifying them together as an integrated system is the best way to assure they provide optimal performance.
Based on the City of Hollywood’s experience, the use of 316L stainless steel should be evaluated carefully due to the potential for problems in the erection and construction of water treatment facilities that will be in contact with high chloride water and/or other corrosive chemistries. As with many membrane facilities, much of the stainless steel is exposed (not buried), which subjected it to atmospheric as well as water quality problems. Therefore, unless the quality control of the raw and reject water (chemical, physical and microbial) can be assured, 316L stainless steel may not be the appropriate material for engineers to specify.
Aerobic bacteria (Crenothrix, Gallionella) primarily are encountered in the fresh surface waters, although anaerobic sulfate-reducing bacteria and facultative strains also are encountered. Ground waters are more likely to contain anaerobic and facultative bacteria, as well as Gallionella than surface waters.3 Sulfate-reducing bacteria also are found in seawater.3