Abstract
Palm-oil mill effluent was degraded in a thermophilic, semi-continuous digester. The operation of semi-continuous digesters allows the accumulation and retention of high biomass concentrations, such that treatment rates approaching those of sludge blanket reactors can be obtained. At a temperature of 57°C space loadings up to 52 kg COD m −3 day −1 were achieved (hydraulic residence time of 1·3 days). These rates are significantly faster than the rates achieved in previously reported thermophilic studies. At the maximum loading, total COD removal was > 70% and soluble COD removal was greater than 97%. The relationship between treatment rate, sludge production and gas production is discussed.
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