Removal of COD and Ammonia-Nitrogen by Sawdust/Bentonite Augmented SBR Process

Abstract

Water pollutants removal by biomass adsorbent has been considered innovative and cost effective, thus commendable for application in industrial applications. However, certain important aspects have been overlooked by researchers, namely the efficiency in the operation time and pollutant removal. In this research, landfill leachate samples with organic components were treated using bentonite-enriched with sawdust augmented (SBR) process. By modifying the pH, the sawdust samples were categorized into three: the acidic, the alkaline, and the neutral. To bentonite samples, the pH-adjusted sawdust was added at 10%, 20%, and 30% amounts by mass respectively. At the optimum aeration rate of 7.5 L/min and contact period of 22 h, the treatment achieved 99.28% and 95.41% removal of COD and NH3-N with bentonite respectively. For both pollutants, in the presence of sawdust, the removal reduced by about 17% with contact period reduced to 2 h which was a considerable achievement.

Low-Cost Permeable Reactive Barrier (PRB) System to Treat the Organic Compounds and Nutrients in the Groundwater Contaminated by the Landfill-Leachate

“…al. [20] have utilized SD in a bentonite-enriched saw dust-augmented sequencing batch reactor and achieved considerable removal of COD and NH3-N in landfill leachate samples. Based on these findings, DAS, washed quarry dust (WQD), washed sea sand (SS), red soil (RS), BC and SD were selected for the current study ( Figure 3).…”

Effect of HRTs on COD and Nutrient Removal in Sequencing Batch Reactor (SBR) Process

“…Nitrogen can be removed by nitrification and denitrification process. During nitrification, ammonium will be oxidized to nitrite and the resultant nitrite will be oxidized further to nitrate [3,4]. For denitrification process, nitrate will be reduced to nitrite and then reduced further to nitrogen gas in anoxic condition [5].…”

“…While for phosphorus, Phosphorus occurs mostly as phosphates (PO4 3-), which are classified as orthophosphates (reactive phosphates), condensed phosphates (polyphosphates), and organic phosphates. Orthophosphates are the main constituent of fertilizers used for agricultural and residential purposes [3,5]. They are found in natural water and provide a good estimation of the amount of phosphorus available for algae and plant growth.…”