The stimulation of microbial activity by microplastic contributes to membrane fouling in ultrafiltration

Research has demonstrated that dissolved organic carbon leaching from plastics can stimulate microbial activity in the ocean. However, similar situation not been reported freshwater, like rivers and lakes. The interaction between microplastic microorganism may probably change water quality, causing operational issues during membrane treatment, such as increased biofouling, pore blockage or formation of filter cake. In this study, influence microplastics (polyethylene, PE) on biofouling community continuous-flow ultrafiltration was investigated. Results demonstrate PE natural surface increase production extracellular polymeric substances (EPS). images scanning electron microscope-energy dispersive spectrometer (SEM-EDS) mapping have confirmed presence biofilm covered particles. Biofouling layer became more hydrophobic with a dense compact due to accumulation EPS stimulated by microplastics. Specific components EPS, especially tryptophan-like soluble byproducts molecular weight distribution 4 kDa 30 kDa, were addition likely be entrapped pores aggravating fouling. main factor caused diversity also affected microplastic. conclusion, mechanism is clear.