Table 1.
Growth rates of duckweed, nutrients removals and chlorophyll concentrations in different dilutions of ADSW
|
Duckweed
(L. punctata)
| |||||||||
|---|---|---|---|---|---|---|---|---|---|
| ADSW dilutions | Growth rate, g dw/m2-day | NH4-N, mg/L, Final | NH4-N uptake, % | NH4-N uptake rate, mg/l-day | PO4-P, mg/L, Final | PO4-P uptake, % | PO4-P uptake rate, mg/L-day | N/P uptake | Chl A + B μg/ml |
| ADSW, 100% |
NA |
NA |
NA |
NA |
NA |
NA |
NA |
NA |
NA |
| ADSW, 50% |
NA |
NA |
NA |
NA |
NA |
NA |
NA |
NA |
NA |
| ADSW, 25% |
-1.6 |
105.1 ± 11.4 |
36.0 ± 3.9 |
5.92 ± 1.7 |
37.1 ± 3.3 |
4.1 ± 1.8 |
0.16 ± 0.07 |
NA |
5.9 ± 1.8 |
| ADSW, 15% |
-1.2 |
45.9 ± 3.3 |
54.9 ± 5.5 |
5.5 ± 1.2 |
21.9 ± 3.0 |
11.3 ± 2.8 |
0.28 ± 0.08 |
NA |
6.1 ± 1.1 |
| ADSW, 10% |
5.4 ± 2.3 |
8.4 ± 1.7 |
87.3 ± 6.5 |
5.8 ± 1.9 |
8.8 ± 3.7 |
45.3 ± 3.0 |
0.73 ± 0.2 |
7.90 |
5.1 ± 2.4 |
| ADSW, 5% |
4.9 ± 2.2 |
2.11 ± 1.1 |
93.5 ± 9.3 |
3.0 ± 1.1 |
4.3 ± 3.0 |
46.9 ± 4.9 |
0.38 ± 0.07 |
7.69 |
4.6 ± 2.2 |
| ADSW, 2.5% |
4.3 ± 1.7 |
0.0 |
100.0 |
1.6 ± 0.7 |
2.1 ± 1.7 |
54.3 ± 3.7 |
0.25 ± 0.09 |
6.44 |
3.1 ± 1.0 |
| ADSW, 1.2% | 3.0 ± 1.6 | 0.0 | 100.0 | 0.88 ± 0.3 | 1.0 ± 0.8 | 60.1 ± 4.8 | 0.15 ± 0.04 | 5.83 | 2.1 ± 0.1 |
ADSW, anaerobically digested swine wastewater; N, nitrogen; P, phosphorus; NA (not analyzed).