Özet:

This study was focused on the monitoring of the performance of a locally designed bench scale stone media trickling bioreactor (SM-TBR) and sand filter (SF) for treatment of sewage. The hydraulic flow rate through the SM-TBR was maintained at 80 ± 2 mL.min-1 at temperature regime of 05-15°C by selecting treatment duration of 12, 24, 36 and 48 hrs. The parameters viz: pH, dissolved oxygen (DO), biochemical oxygen demand (BOD), chemical oxygen demand (COD), total dissolved solids (TDS), total suspended solids (TSS), turbidity, chlorides (Cl–), sulphate (SO4–), phosphates (PO4–), nitrites (NO2–), nitrates (NO3–) and pathogenic indicators (fecal coliforms and Enterococcus faecalis) were monitored during treatment. The efficiency of the SM-TBR was found to be improved with increasing treatment time, maximum reduction of BOD (93.9%), COD (93.9%), turbidity (100%), TSS (85.5%), PO4– (70.3%), SO4– (86%), NO3– (68.6%) and pathogenic indicators (>90%) was observed from the zero time value after 48 hrs of treatment.Finally treated sample was passed through SF for further treatment and approximately 96.2, 96, 100, 82.4, 93, 82.5 and 99.9% reduction for BOD, COD, TSS, PO4–, SO4–, NO3– and pathogenic indicators respectively were observed. The study showed that sequential application of TBR with stones bed and SF is a promising technology for wastewater treatment even at low temperature conditions. It can be scaled up for treating sewage for small communities in developing countries.

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