Ion exchange resin beds are often an attractive growth medium for biological organisms, such as bacteria, mold and algae. In some cases, these growths can build up in the resin bed and physically foul the resin. In most cases, however, the concern is that these organisms will contaminate the effluent water leaving the ion exchange system.
Effective methods for cleaning biologically fouled resin
The Boomsnub site in the state of Washington was listed as a Superfund site in 1995. The site consists of two parcels of land, which previously contained two unrelated businesses that contributed separately to contamination of soil and groundwater.
The Boomsnub Metal Plating facility operated on about 0.5 acres, from 1967–1994. This facility was responsible for releases of chromium-contaminated wastes that resulted in contamination of soil and groundwater by hexivalent chrome.
Superfund site cleanup of chromate-contaminated groundwater
Higher pH solutions, through the addition or use of alkalis such as sodium hydroxide, sodium bicarbonate or sodium carbonate, will result in severely decreased uranium regeneration.
Measures to reduce uranium in the drinking water supply
Let's take a closer look at the technology and operation of ion exchange resins and processes used today in industrial water treatment systems.
Nitrates have no detectable color, taste or smell at the concentrations involved in drinking water supplies, and they do not cause discoloration of plumbing fixtures, so they remain undetectable to our senses. Nitrate removal processes must be either foolproof or include extensive monitoring of the treated water to detect breakthrough or determine the need for regeneration.