In this investigation, the discharge from a septic tank and community wastewater were treated in a pilot scale rotating disc system (RDS) to evaluate the performance of this system under the tropical conditions in Taiwan, with the intention of developing design criteria useful for this region. It was found that by varying the organic loading to the system, different degrees of treatment could be obtained. Results of this study indicated that with an organic loading of 8-10 g B0D/(m2, d), 90% removal of BOD as well as NH4-N removal could be achieved. Ambient temperature was found to have no significant effect on the treatment efficiency, and the optimum hydraulic detention time was within 3 hours. Biological sludge production amounted to 0.6-0.8 kg/kg BOD removed.

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