Abstract
Combinations between ozonation process (O3) and submerged microfiltration (MF) were evaluated as fouling-reducing pretreatments for reverse osmosis (RO) in the treatment of landfill leachate. The modified fouling index (MFI) was used to estimate the fouling potential of raw and pretreated leachates. The results demonstrate that a first ozonation step followed by the microfiltration step represents the best layout, being able to reduce the leachate's MFI over 170,000 times. The whole treatment (O3 + MF + RO) is capable of fitting the landfill leachate to the local standards in force for discharge in fresh water bodies. Additionally, it was possible to notice the benefits of using ozonation prior to the microfiltration step when compared to the opposite order, both because of the smaller MFI value obtained (19.53 s/L2 instead of 5095 s/L2) and also for the improvement in permeate flux during microfiltration step. Finally, the RO permeate characterization suggest that the established treatment route represents an effective treatment for a wastewater as complex as landfill leachate.
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