AWWA WQTC69411

This powerpoint presentation begins by providing a brief overview of reuse of treated wastewater in America. Reclaimed wastewater is an increasinglyimportant source of supply; however, there is growingconcern about quality at the point-of-use related to the impact of organic matter and regrowth. The objectives of this study were to: identify drivers of microbial growth and degradation in reclaimed water; and, conduct a Disinfection Pipe Loop Study to examine the effects of 2 disinfectants on bulk and biofilmrelated organisms. The experimental design andmethods for this study included the following: four seasons, four consecutive days,from five points for >30 parameters = 2,400 data points; genetically modified AOC test organisms; rapid AOC test; AOC Luminescence Method Standard Curves; and, AOC - Modeling Microbial Growth. Pipeloop disinfection study results indicate the following: planktonic bacteria could be inactivated butbiofilm bacteria persisted;higher biofilm and microbial levels occurredat the ends of the system;AOC and BDOC levels increased by freechlorine and somewhat by chloramines; and, the stability of chloramines could be beneficial in reclaimed systems. Study conclusions indicate the following: the rapid bioluminescence method for AOC was successful formeasuring the biostability of reclaimed waters;the levels of natural organic matter had a dramatic impact onthe microbiology of reclaimed water;AOC levels were about 10 times higher than in drinking water;membrane bioreactors effectively reduce AOC and BDOC levels; conventional treatment effectively removes microbes inwastewater, but regrowth occurred in distribution systems;growth of Legionella and Mycobacterium could have publichealth significance; and,chloramines could be beneficial in reclaimed systems. Includes tables, figures.

Product Details

Edition:

Vol. - No.

Published:

11/01/2008

Number of Pages:

36