In biological wastewater treatment, the requirement for organic pollutant characterization depends on the treatment objectives. The lump parameter such as chemical oxygen demand (COD) is sufficient for organic pollutant removal only [1]. For the biological nutrient removal (BNR) process, the wastewater COD needs to be fractionated in terms of their biodegradability. Biodegradability is one of the important characteristics for wastewater. Many pretreatments have been tried to increase waste biodegradability [2], [3] and [4]. Major development has been achieved since the introduction of activated sludge model, in which COD was fractioned into four categories according to their biodegradation characteristics and physical state: readily biodegradable COD (RBCOD), slowly biodegradable COD (SBCOD), inert soluble COD (ISCOD), inert particulate COD (IPCOD)