Discharge of improperly treated paper mill wastewater can be dangerous to the environment. In this study, the effects of pentachlorophenol (PCP) load were investigated and monitored for a year using lab-scale multimedia-sequencing batch biofilm reactor for the removal of PCP, chemical oxygen demand (COD) and ammoniacal nitrogen (NH-N) from recycled paper wastewater. An 18 L reactor 3 composed of Perspex column packed with cylindrical plastic media filled with granular activated carbon (GAC; coconut shells) was used to treat real recycled paper mill effluent with initial COD range of 750-1900-1 mg l at a fixed hydraulic retention time of 24 hr. Three different PCP concentrations (5, 10 and 50 mg) were spiked in the real effluent to evaluate the reactor's performance. PCP removal efficiency decreased from 94% to 61% when PCP concentrations were increased-1-1 from 5 mg l to 50 mg l. In addition, more than 88% of COD was removed, and NH-N was completely 3 eliminated. Both COD and NH-N showed stable removal throughout the study. 3 The overall performance results confirmed that the combination of biofilm and GAC was the best configuration for wastewater treatment as this combination showed good performance efficiency and stable treatment process under stern organic load fluctuations. Therefore, this hybrid system is recommended for the treatment of pulp and paper mill effluents. Multimedia, Pentachlorophenol, Recycled paper mill wastewater, Sequencing batch biofilm reactor The present study aimed to evaluate the effect of PCP load on PCP, chemical oxygen demand and ammoniacal nitrogen removal from recycled paper mill effluent in a lab-scale MM-SBBR system.
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