TABLE 3.
Microbial populations isolated from the water column during biological treatmenta
| Bacterial identification | % Population in:
|
|||||
|---|---|---|---|---|---|---|
| Raw water | Ozone contactor | Filter effluent | Distribution system influent | cPVC pipe effluent | Iron pipe effluent | |
| Gram negative | ||||||
| Acidovorax spp. | 2 | 4 | 7 | |||
| Acinetobacter spp. | 29 | 6 | ||||
| Agrobacterium spp. | 18 | |||||
| Alcaligenes spp. | 12 | 2 | 1 | 12 | ||
| Alteromonas spp. | 2 | |||||
| Comamonas spp. | 1 | 3 | ||||
| Enterobacter spp. | 2 | 5 | ||||
| Flavobacterium spp. | 2 | 5 | ||||
| Hydrogenophaga spp. | 8 | 3 | 1 | |||
| Klebsiella spp. | 10 | 1 | 3 | |||
| Methylobacterium spp. | 1 | 2 | ||||
| Pseudomonas spp. | 14 | 53 | 22 | 12 | ||
| Rhodobacter spp. | 2 | 1 | ||||
| Sphingomonas spp. | 2 | 2 | 19 | |||
| Stenotrophomonas spp. | 2 | 1 | 2 | 6 | ||
| Xanthobacter spp. | 3 | |||||
| Otherb | 2 | 1 | 5 | |||
| Gram positive | ||||||
| Bacillus spp. | 7 | 6 | 6 | |||
| Micrococcus spp. | 6 | |||||
| Nocardia spp. | 1 | 3 | 7 | 53 | 46 | 82 |
| Rhodococcus spp. | 16 | 4 | ||||
| Staphylococcus spp. | 1 | 1 | ||||
| Other | 1 | 1 | 1 | |||
| Unidentified | 3 | 9 | 16 | 33 | 0 | 6 |
a
One hundred isolates from each site were identified.
b
Includes organisms isolated from only one site at a frequency of 1%.