Use of G3-DHS Bioreactor for Secondary Treatment of Septic Tank Desludging Wastewater

Izarul Machdar (Department of Chemical Engineering, Faculty of Engineering, Syiah Kuala University)
Faisal Faisal (Department of Chemical Engineering, Faculty of Engineering, Syiah Kuala University)
Syaifullah Muhammad (Department of Chemical Engineering, Faculty of Engineering, Syiah Kuala University)
Takashi Onodera (Regional Environment Systems Section, Center for Regional Environmental Research, National Institute for Environmental Studies (NIES))
Kazuaki Syutsubo (Regional Environment Systems Section, Center for Regional Environmental Research, National Institute for Environmental Studies (NIES))

Waste Technology
Vol 3, No 2 (2015)

Study was done for the use of the third-generation of downflow hanging sponge (G3-DHS) bioreactor for secondary treatment of septic tank desludging wastewater. The main objective of this study was to evaluate the prospective system of G3-DHS bioreactor to be applied in Indonesia. During experiment, the G3-DHS bioreactor kept a relatively high dissolved oxygen concentration under natural aeration. At a relatively short hydraulic retention (HRT) of 3 h, the G3-DHS bioreactor could remove up to 21% (SD 15%) of total COD, 21% (SD = 7%) of filtered-COD, 58% (SD = 24%) of unfiltered-BOD, and 33% (SD = 24%) of ammonium removal. The final effluent had an unfiltered-BOD of only 46 mg.L-1 (SD = 20 mg.L-1) that it was below the Indonesian standard (unfiltered-BOD = 100 mg.L-1) for thresholds of domestic wastewater treatment plants effluent.