TABLE 4.

Sunlight inactivation coefficients (kS) for fecal indicators from raw sewage and WSP effluent in freshwater, simulated estuarine water (50:50 mixture), and seawatera

IndicatorExpt no.kS for indicator from:
Raw sewage in:WSP effluent in:
Freshwater50:50 mixtureSeawaterFreshwater50:50 mixtureSeawater
Fecal coliforms50.2810.4520.6220.0950.1490.231
70.3610.4210.5930.0850.1220.205
E. coli50.2770.4290.6260.0860.1420.216
70.3950.4210.5800.0800.1190.196
Enterococci50.1310.1550.1970.2240.2330.306
70.2090.1890.3380.2270.2790.314
Somatic coliphages50.1410.1640.1990.0740.3620.180
70.0840.2090.2460.0790.1290.184
F-RNA phages50.1030.1430.132
70.0650.1870.2780.0860.0920.123
  • a In experiments 5 and 7, bacterial shoulder points were removed for slope calculation.