Abstract
Traditional biological wastewater treatment methods face challenges in treating marine aquaculture wastewater with high levels of ammonium, dissolvable phosphorus and low organic matter. In this study, a rotating algal biofilm (RAB) system was demonstrated to be effective in removing organic pollutants and nutrients from mariculture wastewater. The RAB system achieved a removal rate of 25.6 mg/L·d for ammonium and 28.9 mg/L·d for total organic carbon; the maximum phosphate removal efficiency was 99 %, for phosphate as high as 40 mg/L. Prolonging the residence time of algal biofilm can effectively increase the richness of the microbial community structure. High-throughput sequencing analysis revealed that after 145 days of operation, the dominant prokaryotic phyla in the biofilm of the RAB reactor were Gammaproteobacteria and Cyanobacteria, while the dominant eukaryotic phyla were Chlorophyta and Ciliophora. This increase in protozoan abundance promoted pollutant removal. The results show that a RAB system composed of algae and bacteria is an effective technology for treating marine aquaculture wastewater.
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