Flushing and Dechlorinating Large Diameter Pipe
Flushing and Dechlorinating Large Diameter Pipe
(OP)
I am installing a 48" diameter water main and the needed flow rate to flush the line is about 15,000 gpm. I was told by the State DEP that we need to dechlorinate this water before sending to the stream. Does anyone know of any dechlorination systems that can handle these types of flows. The only ones i found only go up to 6000 gpm.





RE: Flushing and Dechlorinating Large Diameter Pipe
RE: Flushing and Dechlorinating Large Diameter Pipe
Richard A. Cornelius, P.E.
WWW.amlinereast.com
RE: Flushing and Dechlorinating Large Diameter Pipe
RE: Flushing and Dechlorinating Large Diameter Pipe
bisulfite ('scavanger') is commonly used on RO plants to remove active chlorine and protect membranes. this sounds like the best option to me!
RE: Flushing and Dechlorinating Large Diameter Pipe
Seán
www.expertise-limited.co.uk
RE: Flushing and Dechlorinating Large Diameter Pipe
Is it possible that such a pig cleaning/flushing operation, with a smaller (pig) propelling velocity through the large main could however effectively keep even some quite sizeable objects and debris ahead of the pig and additionally maybe allow at least a small volume though at maybe even very high velocity of clean water forward past the pig (right where it is needed continually jetting around the periphery of the pig to maybe even more thoroughly clean the walls), with an added benefit that a much smaller discharge rate to the environment might be better handled by now existing/avaialble dechlorinators where this is necessary etc.? Perhaps it could thus be argued some sort of well-designed pigging operation might thus do the job, be feasible, and if no means is available now for required dechlorination be better for the environment or downstream waste water treatment?
This suggestion of course would require at least some sort of pig insertion devices/plans etc. Perhaps those certainly more expert in these fields (the pig manufacturers and/or those on standards committess or regulatory folks?) could comment on the potential of such alternative approach?
RE: Flushing and Dechlorinating Large Diameter Pipe
Or alternatively, this also might be a good opportunity just to dilute the water prior to discharge to the stream. Unlike other pollutants, there shouldn't be any reason to expect that the chlorine will accumulate in the environment.
RE: Flushing and Dechlorinating Large Diameter Pipe
RE: Flushing and Dechlorinating Large Diameter Pipe
RE: Flushing and Dechlorinating Large Diameter Pipe
In addition, the paper will answer all of your other questions regarding chlorine removal as well.
http://
RE: Flushing and Dechlorinating Large Diameter Pipe
The elegant method is simply called flushing. You should have normal system water pressure in the water main to push out the chlorinated water.