TABLE 2.
Microbial counts obtained for the waste streams sampled in periods 1 and 2
| Waste stream | Sampling period | Microbial counts (log CFU/g)a,b |
||||||
|---|---|---|---|---|---|---|---|---|
| Total viable counts | Enterobacteriaceae | Lactic acid bacteria | Aerobic bacterial endospores | Yeasts and molds | Sulfite-reducing clostridia | Salmonella spp. | ||
| Chicken litter | 1 | 10.6 ± 0.1 B | 8.3 ± 0.3 B | 8.5 ± 0.2 A | 5.4 ± 0.2 A | 6.1 ± 0.6 A | ND | <3.2 ± 2.1 A |
| 2 | 10.2 ± 0.2 A | 5.3 ± 0.2 A | 8.7 ± 0.2 A | 6.3 ± 0.4 B | 5.6 ± 0.1 A | 2.8 ± 0.4 | <2.0 ± 0.0 A | |
| Vegetable overproduction auction | 1 | 7.0 ± 0.1 A | 2.7 ± 0.3 A | 3.5 ± 0.4 A | 2.7 ± 0.1 A | 3.3 ± 0.0 A | ND | <2.0 ± 0.0 A |
| 2 | 8.0 ± 0.1 B | 2.2 ± 0.1 A | 5.2 ± 0.0 B | 5.1 ± 0.0 B | 5.1 ± 0.0 B | 2.5 ± 0.1 | <2.0 ± 0.0 A | |
| Corn meal | 1 | 5.2 ± 0.6 A | 4.3 ± 0.9 A | 4.3 ± 0.1 B | 3.8 ± 0.2 B | 3.7 ± 0.3 A | ND | <2.0 ± 0.0 A |
| 2 | 5.2 ± 0.1 A | 4.5 ± 0.3 A | 3.8 ± 0.2 A | 2.4 ± 0.0 A | 4.1 ± 0.1 A | 1.5 ± 0.1 | <2.0 ± 0.0 A | |
| Grain mix | 1 | 7.7 ± 0.0 A | 5.0 ± 0.2 A | 5.9 ± 0.1 B | 5.8 ± 0.5 B | 5.5 ± 0.1 A | ND | <2.2 ± 0.3 A |
| 2 | 8.8 ± 0.0 B | 6.8 ± 0.2 B | 5.5 ± 0.1 A | 4.2 ± 0.4 A | 5.4 ± 0.4 A | 2.9 ± 0.2 | <2.0 ± 0.0 A | |
| Apple pulp | 1 | 9.0 ± 0.0 B | <1.0 ± 0.0 A | 9.1 ± 0.0 B | 4.7 ± 0.4 B | 5.7 ± 0.1 B | ND | <2.0 ± 0.0 A |
| 2 | 6.3 ± 0.2 A | 2.3 ± 0.2 B | 6.2 ± 0.1 A | 2.2 ± 0.3 A | 4.7 ± 0.3 A | <1.0 ± 0.0 | <2.0 ± 0.0 A | |
| Fruit puree | 1 | 8.6 ± 0.6 A | <1.0 ± 0.0 A | 8.8 ± 0.1 A | 3.5 ± 0.3 A | 7.1 ± 0.1 A | ND | <2.0 ± 0.0 A |
| 2 | 7.9 ± 0.1 A | <1.0 ± 0.0 A | 8.8 ± 0.0 A | 3.0 ± 0.1 A | 8.1 ± 0.0 A | <1.0 ± 0.0 | <2.0 ± 0.0 A | |
| Catering/supermarket/industrial food waste | 1 | 8.3 ± 0.0 A | 3.4 ± 0.1 A | 8.9 ± 0.0 B | 6.0 ± 0.1 B | 6.4 ± 0.2 A | ND | <2.0 ± 0.0 A |
| 2 | 8.4 ± 0.0 A | 5.9 ± 0.1 B | 8.5 ± 0.0 A | 5.8 ± 0.0 A | 7.0 ± 0.2 B | 2.8 ± 0.0 | <2.0 ± 0.0 A | |
| Household food waste | 1 | 8.1 ± 0.2 A | 3.8 ± 0.1 A | 8.5 ± 0.1 A | 7.2 ± 0.0 B | 5.8 ± 0.1 A | ND | <2.0 ± 0.0 A |
| 2 | 9.2 ± 0.1 B | 6.9 ± 0.1 B | 9.3 ± 0.0 B | 6.3 ± 0.0 A | 7.2 ± 0.1 B | 3.8 ± 0.1 | <2.0 ± 0.0 A | |
| Strawberry leavesc | 1 | 9.4 ± 0.5 | 7.9 ± 0.5 | 8.2 ± 0.2 | 4.6 ± 0.1 | 6.6 ± 1.0 | ND | <2.0 ± 0.0 |
| Tomato leavesc | 1 | 8.3 ± 0.0 | 2.8 ± 2.0 | 8.3 ± 0.0 | 3.6 ± 0.3 | 5.1 ± 0.4 | ND | <2.0 ± 0.0 |
a
Results are presented as the mean of three replicates ± standard deviation. Mean plate counts from different periods of the same waste stream that share a letter (A, B) are not statistically different (P ≥ 0.05).
b
ND, not determined.
c
For strawberry leaves and tomato leaves, only data for sampling period 1 were obtained.