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Chemical Feed Reliability News April 2019

REPLACEMENT VACUUM LIQUID FEEDER FOR POLY ALUMINUM CHLORIDE ENDS FEED RELIABILITY PROBLEM FOR SWTP

Also Cuts Process Chemical Costs

 
 

The Chief Operator for a surface water treatment plant (SWTP) reports that replacement of

a troublesome vacuum liquid feeder for poly aluminum chloride (PACl), with a more advanced vacuum liquid feeder, ended the threat of a process upset for operations staff that was caused by the previous unit not being able to hold a constant feed rate. The ability to provide a consistent feed is needed as a key element in the plant pre-treatment process, which features turbidity reduction and clarification.

 “The previous unit’s roto meter couldn’t maintain the desired feed rate, causing us to have to constantly monitor it,” said Scott Rader, at the Wilderness Public Service District’s 0.5 MGD SWTP in Mt. Nebo, WV. “We made it work for over 10 years, but the feed rate would drop off, and so we were very happy to finally get funding for the replacement unit.

It maintains a set point under all conditions, working smooth as silk and slick as a ribbon. We don’t have to fear coagulant feed rate failures now.”

 
Treatment starts with alkalinity adjustment of the raw water using sodium bicarbonate; continues with the injection of PACl (primary coagulate) just upstream of a static mixer; is followed by non-ionic polymer feed just before flocculation; and concludes pre-treatment with sedimentation/clarification.

Treatment starts with alkalinity adjustment of the raw water using sodium bicarbonate; continues with the injection of PACl (primary coagulate) just upstream of a static mixer; is followed by non-ionic polymer feed just before flocculation; and concludes pre-treatment with sedimentation/clarification.