Coagulation - submerged membrane system for NOM removal from water

Our paper presents the results of investigations on the treatment of waters involved in unit process ultra­filtration, hybrid process - coagulation/sedimentation/ultrafiltration and in-line coagulation/ultrafiltration. In membrane filtration that we applied immersed capillary membranes. Simulated water containing humic acids at 30 mg/l was ultrafiltered with a constant volumetric permeate flux amounting to 5.7*10"6 m3/m2-s. Four coagulants were tested, for which the optimal process parameters were determined experimentally. We determined the effectiveness of ultrafiltration and that of the hybrid system coagulation-membrane filtration, basing on measurements of the membranes' yield (permeate flux) and physico-chemical analysis of raw water and permeates. Also residual concentration of metal ions (Al and Fe) in permeates were deter­mined. The application of the hybrid system, combining coagulation and ultrafiltration, offers better effects of the removal of organic pollution.