Performance of Fixed Bed Fixed Film (FBFF) Reactor Effect of Organic Loading Rate

Document Type : Primary Research paper


1 Research Scholar, Department of Civil Engineering, Annamalai University, Annamalainagar-608002, Tamil Nadu.

2 Professor, Department of Civil Engineering, Annamalai University, Annamalainagar-608002, Tamil Nadu.


In high COD industrial wastewater treatment, the conventional trickling filters suffer serious operating problems like clogging and partial system coverage which are eventually resulting in sanitary area conditions and also lesser treatment efficiency. The alternative structural components, to replace the conventional stones and pebbles with pre-designed, hybrid plastic modules are expected to overcome the operational problems of trickling filters, with more surface area per volume of module filling (m2/ m3).Hence, such systems can be used for higher organic loads and for still better organics removal. Such processes that are envisaged with plastic modules as filling media replacing the conventional porous media are known as Fixed Bed Fixed Film (FBFF) reactor.The active anaerobic microorganisms attached with the surface of the filling media, offers low fill media ratio that will essentially biodegrade the Oxygen Demand (COD) under endogenous phase, resulting in COD removal at more than 78% under high Organic Loading Rates (OLR). The loading ranges between0.005- 0.075 kg COD/ The experimental model is designed to have plastic models that have a higher net surface area for attached growth biomass. The model has an effective volume of 24.36 litres with plastic modules filled for 41% of the reactor volume with a total surface area of 5 m2.The model was fitted with a peristaltic pump that can load influent at 0.5, 1.0, 1.5, 2.0, and 2.5 lit/hr theHydraulic Retention Time of 48, 24, 16, 12 and 9.6 hrs.