prechlorination


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prechlorination

[¦prē‚klȯr·ə′nā·shən]
(civil engineering)
Chlorination of water before filtration.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
References in periodicals archive ?
"It is interesting that after a state agency reviews all material, they typically provide feedback that prechlorination may be a safer and more stringent process than post chlorination, and if prechlorination is not used on a pipebursting project, temporary services need to be set up."
"Prechlorination can be a good approach when using coiled pipes as is the case in England where typically much smaller-diameter pipes are used," says Collins Orton, product specialist at TT Technologies, Aurora, IL, a primary provider of pipebursting equipment in the U.S.
Because the samples of treated water were drawn directly following filtration, the reduction of organic material and microbiological components was incomplete, despite partial prechlorination. The process usually terminates during the storage time post-chlorination.
Hollywood's lime-softening treatment plant employed prechlorination of the raw water upstream of the units and post-chlorination applied at three locations: into the effluent from the valveless filters prior to storage; into influent to the dual-media filters; and prior to distribution from a high-service pump station.
Second, the FDEP considers pipe prechlorination to be consistent with Section 4.6 of American Water Works Association (AWWA) Standard C651, which is incorporated by reference in Florida's administrative rules regulating public water systems.
Nevertheless, the raw water cannot be regarded as pathogen free, as typically 45% of 100-mL prechlorination samples from the Silvan reservoir and 23% of samples from the Cardinia reservoir contain fecal coliform organisms.
Prechlorination. Water treated in the demonstration plant is chlorinated at Croton Reservoir.