Reduction of waterborne microorganisms in treated domestic wastewater for reuse in agriculture: Comparison between floating media filter and sand filter

  • Semsayun, Chalanda (Department of Environmental Engineering, Faculty of Engineering, Kasetsart University) ;
  • Chiemchaisri, Wilai (Department of Environmental Engineering, Faculty of Engineering, Kasetsart University) ;
  • Chiemchaisri, Chart (Department of Environmental Engineering, Faculty of Engineering, Kasetsart University) ;
  • Patchanee, Nopparat (Fisheries Program, Faculty of Agriculture Technology, Sakon Nakhon Rajabhat University)
  • Received : 2015.08.03
  • Accepted : 2015.11.12
  • Published : 2015.12.31


This study aims to investigate the use of a floating media filter (FMF) to eliminate waterborne microorganism in treated domestic wastewater for reuse in agriculture. A conventional sand filter (SF) was used concurrently to compare treated water quality. The total/fecal coliforms and somatic coliphage were employed as fecal indicators. The result showed that the FMF was fed with 3 times higher infiltration rate ($15m^3/m^2.h$) than that in the SF ($5m^3/m^2.h$), in which both filters gave similar coliform removal at 6 hours operation. The somatic coliphage elimination tended to increase with operational time for the FMF while that of the SF showed decreasing trend. When a 24 hour continuous operation was applied for the FMF, it showed better removal of somatic coliphage (78%), fecal coliforms (60%) and total coliforms (56%) than that of 6 hour operation. In conclusion, the FMF gave better performance than the SF did by producing a good quality of treated water for agriculture in terms of waterborne microorganisms including turbidity and suspended solids.


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