Water/Wastewater
Wastewater Plants Can Finally Optimize NaOCl Feed
Aug 03 2009
A common problem with feeding commercial sodium hypochlorite (NaOCl) and other high strength chemical oxidants is outgassing. Outgassing occurs when a pocket of vapour forms in the fluid line, obstructing normal flow. Outgassing often vapour locks chemical metering pumps and can lead to system leaks and result in unscheduled downtime and poor process performance. Another common problem with feeding NaOCl is hard water scale, which can completely jam the operation of a pump’s wet end.
The inherent design of Masterflex peristaltic pumps from Thermo Scientific (USA) eliminates the potential for vapour lock because the fluid being pumped never actually touches the pump, but rather is occluded – or “squeezed” – through elastomer tubing. This squeezing action of the flexible tubing generates a powerful vacuum that moves both gases and liquids simultaneously, without clogging or producing vapou lock. Scale problems in the pump also are a nonissue because there are no valves or seats to foul in the fluid stream. Masterflex Pumps provide wastewater treatment operations extremely versatile liquid chemical feed and fluid handling with the highest reliability and long-term operation – plus simple, low maintenance. There is no unscheduled downtime to bleed the lines of vapour locked pumps, no problems with scaling, and no valves or seats to clog or wear out. Together with new formulations providing tubing life in excess of 1,000 hours, all this makes Masterflex the pump of choice “when performance counts.”
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