The fouled membranes look almost similar with clean membrane on the basis of pore structure. The size of pores seemed to
be unchanged after the treatment generally. However, it can be
seen only little difference between clean membrane and fouled
membrane at 36 bar. Some pore soft his membrane(Fig. 6(b)) disappeared due to plugging with the deposition of impurities. This
can be at tribute to the effect of higher transmembrane pressure.