Abstract
Seaweeds have been verified to effectively reduce the nutrients of aquaculture wastewater, and to increase the economic output when commercially valuable species are utilized. Pyropia/Porphyra/Neopyropia/Neoporphyra species are important seafood resources globally, and their growth and bioremediation capacities are affected by diverse biotic and abiotic stressors. In this study, we investigated the effects of desiccation (0, 1, 2, 4, and 6 h of air exposure), water velocity (0.1, 0.2, and 0.5 m s−1), and the nitrogen limitation period (1, 2, and 3 d) on the relative growth rates (RGR) and nutrient removal rates of Neoporphyrahaitanensis and Neoporphyradentata. The RGRs and NO3-N removal rates of the two species decreased significantly with increasing desiccation periods. A higher water velocity of 0.5 m s−1 had a greater negative impact on the RGRs and NO3-N and PO4-P removal rates than 0.1 and 0.2 m s−1. N. haitanensis exhibited a greater tolerance to water motion than N. dentata. Additionally, the RGRs and NO3-N and PO4-P removal rates were significantly different among the nitrogen limitation periods. N. haitanensis and N. dentata exhibited different nitrogen usage strategies after nitrogen limitation and recovery. These results provide valuable information relating to the excessive nutrient removal from aquaculture wastewater by Neoporphyra species.
Highlights
Aquaculture was one of the fastest-growing commercial activities in the last few decades
The results of the two-way ANOVA showed that the relative growth rates (RGR) of N. haitanensis and N. dentata were significantly affected by desiccation, but they did not significantly differ between the two species (Figure 1; Table 1)
The NO3-N removal rates of N. haitanensis and N. dentata were significantly affected by desiccation, but they did not significantly differ between the two species
Summary
Aquaculture was one of the fastest-growing commercial activities in the last few decades. In terms of the increasing storage of natural resources, the recirculating aquaculture system (RAS) has become one of the most sustainable models of marine animal aquaculture [2,3,4]. Much research has been performed to look for bioremediation technologies that could solve this problem and ensure its environmental sustainability [7,8,9]. Due to their low cost and high uptake efficiency, seaweeds have become a feasible alternative in the bioremediation of eutrophic wastewater [10,11,12].
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