Large-scare subsurface flow constructed wetland for marine aquaculture water purification: functional microbial detection

Abstract

In order to improve the quality of natural seawater to meet the needs of aquaculture production, a large-scale subsurface flow constructed wetland was constructed and operated stably for 2 years to study its purification effect on natural seawater. Studies had shown that the system could maintain high purification effect on natural seawater during aquaculture, and could effectively remove harmful algae such as Cyanobacteria, especially in warm months. The pyrosequencing of 16S ribosomal DNA revealed that Proteobacteria, Nitrospirae, chloroflexi were the main and key bacterial phyla in the system. Members of these key gates were regarded as the important roles in resisting water purification. In summary, the subsurface flow wetland system was suitable for large-scale seawater aquaculture plants, which could effectively improve seawater quality conditions and reduced the density of harmful algae cells.