Citation:

Geldreich, E. MICROBIOLOGICAL CHANGES IN SOURCE WATER TREATMENT: REFLECTIONS IN DISTRIBUTION WATER QUALITY. U.S. Environmental Protection Agency, Washington, D.C., EPA/600/A-92/184 (NTIS PB92217363).

Description:

Microbial quality in the distribution system is a reflection of raw source water characteristics, treatment process configurations and their modifications. ased on case history experiences there may at times be a microbial breakthrough that is caused by fluctuations in raw surface water turbidity, chlorine demand and water pH. hese situations call for appropriate changes in operational practices to compensate for water quality degradations. n the effort to reduce THM production, operational practices should not abandon the concept of multiple barriers nor the necessity to produce a high quality process water that can be effectively disinfected. rowing data base from many systems suggests there may be some microbial migration deeper into the treatment train while achieving better organic contaminant reductions. his situation makes disinfectant concentration and contact time (C.T) values of critical importance. one of these issues are beyond control using reasonable treatment precautions by water plant operations. ue to the complex interaction of many significant variables within the treatment train, it can be reasoned that there will be at least some biological activity in the final effluent from any treatment system, assuming traditional disinfection procedures and doses. hat is required is a revised monitoring program for water treatment processes that will provide more useful microbiological information by which to fine-tune treatment effectiveness for better quality waters.

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