In 2007, the NSF Intl. Drinking Water Treatment Unit Joint Committee revised the NSF/ANSI Standard 53 protocol for pH 8.5 lead reduction based on a substantial amount of research on particulate and colloidal lead. The research conducted by the NSF task group revealed a great deal of inconsistency in the amount of particulate lead formed from batch to batch and from laboratory to laboratory due to the precipitation of this element from the solution.
Testing and developing a lead-reduction filter for gravity pitchers
Water softener resin is extremely porous, which is beneficial because it allows for more surface area to capture calcium and other metals in source water. Surprisingly, 99% of ion exchange actually happens in the interior of the bead. Resin beads, ranging in size from 16 to 50 mesh, are abused daily during the backwash process and by contaminants in the source water. Resin could last much longer in these hostile environments with a few fairly inexpensive solutions.
Cleaning options to reduce resin fouling
The most common question from customers of water treatment systems utilizing adsorbent media is, “How long will the media/system perform?” The most common answer may be a number of months or years but should be more elaborative than a mere number. The most honest answer is, “It depends on the water chemistry.”
New test improves prediction of system and media performance
Ever since granular adsorbent media such as bone char and granular activated carbon (GAC) replaced powdered activated carbon (PAC), the amount of air in a bed of dry GAC has adversely affected the performance of many adsorption systems. Too many operators of liquid phase adsorption systems are unaware of this property.
Addressing air in the bed of dry GAC
Environmental World Products focuses on component distribution, sourcing and new product development for commercial and industrial water treatment applications. Its product line includes RO system components, such as membrane housings, filter housings, bag housings, filter cartridges, couplings, control valves, flowmeters, solenoid valves, needle valves, controllers/monitors and pressure gauges.
New refillable filter shells feature a snap-fit end cap. The design requires no welding equipment or tools to seal the end cap. The durable shell construction and tight seal increase strength to resist cracking and prevent the end cap from popping out under high water pressure. It is designed to bear up under the high suction of vacuum-sealed packaging.
UFMC Series carbon wrap filters are cellulose free. Manufactured from carbon and polypropylene fibers, these filters will not harbor bacteria and other organics that are typical with cellulose-based filters. These cost-effective, single-stage cartridges are ideally suited for removal of sediments and reduction of unwanted taste, odor and chlorine from drinking water. They are available in 5, 10 and 20 microns in standard 2.6-in. and jumbo 4.5-in. OD diameters of 10- and 20-in. lengths.
San Antonio de Los Cobres, a community of 6,000 residents in the Andes Mountains in Argentina, faced a challenging arsenic concentration of up to 290 ppb in its water supply. It needed a solution to reduce the level to below the maximum contaminant level set by the World Health Organization (WHO) of 10 ppb.
Remote Andean town reduces arsenic with new treatment system
In many developing areas in Africa, accessing clean drinking water is a serious challenge for thousands of communities. The only sources of water available to their residents often are overrun with bacteria, waste and harmful contaminants. Many times, a family’s only way to obtain potable water is to walk long distances to the nearest well or other groundwater source. Such a task has several adverse effects, particularly on women and children, who may spend much of their time retrieving low-quality water for their families instead of attending school.
Nonprofit organizations work to provide clean water in Africa