Effect of salinity on the performance of and microbial community structure in a self-forming dynamic membrane bioreactor
WEN Chun
JIN Chunji
GU Baiming
FAN Shasha
ZHAO Nannan
Abstract：Self-forming dynamic membrane bioreactor(SFDMBR)was used to treat shrimp tail water at different salinities.The effects of salinity on membrane flux,sludge properties,pollutant removal effi-ciency and microbial community structure of sludge were investigated.The results showed that mem-brane flux,sludge concentration(MLSS)and sludge volume index(SVI)decreased significantly when the salinity increased from 0‰ to 28‰ while the membrane fouling rate accelerated and the membrane service cycle shortened.The removal rates of COD and ammonium nitrogen decreased.However,the removal rates still reached to 90％and 80％when the salinity was 28‰,which indicated a good removal effect.High-throughput sequencing results showed that Shannon index increased from 6.16 to 7.43 when salinity increased from 0‰ to 21‰,indicating an increase in microbial community diversity.When the salinity continued to increase to 28‰,the Shannon index decreased to 7.10,and the abun-dance and diversity of the microbial community decreased significantly.The dominant bacteria in the reactor were Proteobacteria,Actinobacteriota,Firmicutes and Bacteroidota.Micropruina,Plasticicu-mulans,Candidatus,Alysiosphaera and Ferruginibacter were higher in relative abundance and better in salt tolerance.The experiment showed that SFDMBR performed desirablly in treating prawn aqua-culture tail water at different salinities,and strongly adaptable to salinity changes.Our findings provid-ed a reference to the treatment of wastewater with different salinity.
Keywords：self-forming dynamic membrane bioreactorshrimp tail watermicrobial community struc-turemembrane fouling
Publication Date：2025-12-30
Online Publishing Date：2026-05-22(First online date of this platform, not the publication date of the document)
Pages：7( 101-107 )