AWWA JAW34268

Granular activated carbon (GAC) in filter-adsorbers provides an excellent support surface for the proliferation of microorganisms. Therefore, GAC beds may release particles of carbon with attached bacteria that are protected from disinfection. In this pilot-plant study, particles were collected from the product waters of GAC filter-adsorbers, examined for bacterial colonization, and characterized by energy-dispersive X-ray analysis. Results showed that bacteria attached to GAC particles could be disinfected with chlorine if particle concentrations were in the range found in the product waters, i.e., < 20 ug/L. Increasing particle concentration tenfold interfered with disinfection efficiency. Powdered activated carbon used in pretreatment contributed to the particles found in product water. Includes 17 references, tables, figures.

Product Details

Edition:

Vol. 85 - No. 9

Published:

09/01/1993

Number of Pages:

11

File Size:

1 file , 2.6 MB