New Microbial Indicators of Disinfection Efficiency.
Abstract
Since the coliform group of organisms is less resistant to chlorine than many viral pathogens, the utility of both yeasts and acid-fast organisms as indicators of disinfection efficiency was evaluated. Four yeasts, Candida parapsilosis, C. krusei, Trichosporon fermetans and Rhodotorula rubra; and three acid-fast organisms, Mycobacterium fortuitum, M. phlei, and M. Smegamtis, were found to occur commonly in domestic wastewater. The resistance to free chlorine was: acid-fast organisms > yeasts > poliovirus type 1 Mahoney strain > Salmonella typhimurium > Escherichia coli using mixed cultures including two acid-fast organisms and four yeasts at pH 6, 7, and 10 and 5 deg and 20 deg C. The resistance to inorganic chloramines (5:1 wt ratio Cl2:NH3-N) was M. fortuitum > C. parapsilosis > M. phlei > E. coli at pH 7 and 20 C. C. parapsilosis appeared to be more resistant to ozone than E. coli at room temperature.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jul 01, 1975
- Accession Number
- ADA030547
Entities
People
- Blaine F. Severin
- Mark T. Masarik
- Richard S. Engelbrecht
- Sai H. Lee
- Shaukat Farooq
Organizations
- University of Illinois Urbana–Champaign