Characterization of Microbial Communities in Pilot-Scale Constructed Wetlands with Salicornia for Treatment of Marine Aquaculture Effluents

Table 1

Characteristics of the influent and effluent of CWs treating mariculture wastewater under different TAN concentrations.

Parameters	TAN (mg/L)	NO2^−-N (mg/L)	NO3^−-N (mg/L)	PO4^3−-P (mg/L)	pH	T (°C)
Final effluent
L	0.020 ± 0.001^a	0.008 ± 0.002^a	1.348 ± 0.331^a	0.420 ± 0.005^a	7.88	19.9
M	0.773 ± 0.178^b	0.006 ± 0.003^a	1.145 ± 0.074^a	0.398 ± 0.008^a	7.72	19.9
H	3.510 ± 0.479^c	0.013 ± 0.002^b	0.675 ± 0.035^b	0.356 ± 0.026^b	7.62	19.8
Final variation
L	−0.028 ± 0.001^a	−0.187 ± 0.002^a	−1.462 ± 0.331^a	−0.008 ± 0.005	+0.04	+0.3
M	−0.323 ± 0.178^b	−0.008 ± 0.003^b	−1.210 ± 0.074^a	−0.033 ± 0.008	+0.03	+0.5
H	−1.247 ± 0.479^c	−0.005 ± 0.002^b	−0.285 ± 0.035^b	−0.026 ± 0.026	+0.10	+0.4
Removal rate (%)
L	58.51 ± 2.13^a	96.07 ± 1.04^a	52.03 ± 11.77^a	1.87 ± 0.012
M	29.46 ± 16.21^b	59.26 ± 19.25^b	51.38 ± 3.13^a	8.20 ± 0.019
H	26.21 ± 10.07^b	27.93 ± 10.92^c	29.69 ± 3.65^b	6.88 ± 0.068

Final variation = effluent concentration − influent concentration; removal rate = ((effluent concentration − influent concentration)/influent concentration) × 100%. L: low influent TAN concentration group (0.75 mg/L); M: middle influent TAN concentration group (2.31 mg/L); H: high influent TAN concentration group (7.23 mg/L). Differences in the final effluent and removal rate among the groups were tested using one-way ANOVA. Different characters indicate significant differences () (means ± SD, ).