Abstract
Two types of pilot scale systems, namely, reactors in series and single reactor, were tested for developing an on-site small wastewater treatment plant. Combined bio-fixed film and aquatic plant for a moderate land limited and tropical application were tested for the proposed system. Anaerobically digested wastewater with TCOD concentration of about 500 and 1000 mg/L was used as the substrate and various hydraulic retentiontimes(HRT) and loading rates were tested for optimal removal of organic and inorganic pollutant contained in the anaerobically digested wastewater. It was found that the removal efficiencies of TCOD and NH4-N of more than 90% and 95%, respectively, could be achieved under the loading rate of 120 g TCOD/m3/day and 13 g NH4-N/m3/day and HRT of more than 14 days. The system has demonstrated that it is simple in construction and operation. It is highly possible to be integrated as one of the components of the swine waste management system in the tropics and moderate land limited conditions.
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