Abstract
A kinetic study of the anaerobic digestion of palm oil mill effluent (POME) was carried out in a continuous, well-stirred digester with microorganisms immobilised on saponite support granules. A COD removal of 96·2% was achieved in the reactor at a volumetric loading rate of 10·6 kg COD/m 3 day (hydraulic retention time of 6·2 days); the methane production rate was first order with respect to biodegradable substrate concentration. The apparent rate constant was proportional to the volatile suspended solids concentration and the product yield coefficient, Y p, was 0·325 litre CH 4 STP/g COD consumed.
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