Table 1 Average values (± SD) of pH, dissolved oxygen (DO), temperature and salinity measured weekly (n = 5) in the inflowing water of each set of polychaete assisted sand filters (PASFs) at 10 AM, 2 PM and 6 PM. Raw PASFs—received the raw effluent from the earthen pond stocked with Sparus aurata; Df PASFs—received the raw effluent after being screened by a drum filter; and Df + Alg PASFs—received effluent after being screened by a drum filter and a macroalgae biofilter stocked with Ulva rigida.
10 AM | 2 PM | 6 PM | ||||||||
|---|---|---|---|---|---|---|---|---|---|---|
PASFs | pH | O2 (mg L−1) | Temp. (C) | Salinity | pH | O2 (mg L−1) | Temp. (°C) | pH | O2 (mg L−1) | Temp. (°C) |
Raw | 7.66 ± 0.14 | 5.52 ± 0.94 | 19.28 ± 2.29 | 40.08 ± 1.01 | 7.64 ± 0.12 | 5.98 ± 0.66 | 20.96 ± 2.28 | 7.73 ± 0.17 | 6.47 ± 1.26 | 20.49 ± 4.00 |
Df | 7.78 ± 0.15 | 7.95 ± 0.25 | 19.44 ± 2.28 | 40.07 ± 1.01 | 7.81 ± 0.16 | 8.01 ± 0.42 | 20.81 ± 2.44 | 7.83 ± 0.19 | 7.94 ± 0.77 | 20.31 ± 3.99 |
Df + Alg | 8.20 ± 0.24 | 8.40 ± 0.80 | 18.87 ± 2.29 | 40.04 ± 1.11 | 8.61 ± 0.19 | 10.11 ± 0.94 | 21.27 ± 2.41 | 8.81 ± 0.14 | 8.68 ± 0.83 | 20.76 ± 2.97 |
