Two-stage membrane bioreactor (MBR) system was applied to the treatment of landfill leachate from a solid waste disposal site in Thailand. The first stage anoxic reactor was equipped with an inclined tube module for sludge separation. It was followed by an aerobic stage with a hollow fiber membrane module for solid liquid separation. Mixed liquor sludge from the aerobic reactor was re-circulated back to anoxic reactor in order to maintain constant mixed liquor suspended solids (MLSS) concentration in the aerobic reactor. The removal of micro-pollutants from landfill leachate along the treatment period of 300 days was monitored. The results indicated that two-stage MBRs could remove biochemical oxygen demand (BOD), chemical oxygen demand (COD) and NH4+ by 97, 87 and 91% at steady operating condition. Meanwhile organic micro-pollutant removals were 50–76%. The removal efficiencies varied according to the hydrophobic characteristic of compounds but they were improved during long-term MBR operation without sludge discharge.
Removal of organic micro-pollutants from solid waste landfill leachate in membrane bioreactor operated without excess sludge discharge
V. Boonyaroj, C. Chiemchaisri, W. Chiemchaisri, K. Yamamoto; Removal of organic micro-pollutants from solid waste landfill leachate in membrane bioreactor operated without excess sludge discharge. Water Sci Technol 1 October 2012; 66 (8): 1774–1780. doi: https://doi.org/10.2166/wst.2012.324
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