Based on the membrane separation technology

biopolymeric ferric sulfate (BPFS) was prepared with the optimized sequential batch processThe effect on separation of microorganisms

biocatalytical oxidation rate of Fe2+

preparation periods and membrane pollution were investigated by using polyvinylidene fluoride hollow fiber membrane (PVDF) to separate microorganismsThe results showed that the biomass in BPFS obviously increased through the membrane separation processBy using the optimized process

the BPFS with total iron contents of 60kg·m-3

80kg·m-3

100kg·m-3 were preparedThe biocatalytical oxidation rate of Fe2+ reached 1.75 g·L-1·h-1

1.85 g·L-1·h-1

1.43 g·L-1·h-1 

preparation periods were 155h

21h

40h

a decrease by 38%

42%

18% respectively as against the process before optimizationThe biomass in BPFS reached the order of magnitude of 108 num·ml-1With the increase of separation time and the content of total iron of BPFS

membrane pollution was intensified seriously

and membrane flux decreased obviouslyPVDF was cleaned by a mixture of 0.2 mol·L-1sodium oxalate and 0.2 mol·L-1sulfuric acid

and the scavenger can clean out the fouls from the membrane surface and satisfy the separation requirement.