Abstract:
This research studied on the replacement of the aerated grit chamber by using hydrocyclone and hydrocyclone equipped with grit pot to remove grit from Dindaeng municipal wastewater. Operating parameters such as inlet pressure, diameter of hydrocyclone, underflow diameter and grit pot operating times were studies. In addition, this research also studied on the efficiency between classical hydrocyclone, hydrocyclone equipped with grit pot and aerated grit chamber, which currently uses in Dindaeng municipal wastewater treatment plant. The results indicated that the grit removal efficiency of hydrocyclone and hydrocyclone equipped with grit pot were as high as 86 and 68 % respectively. However, the average value of accumulated grit concentration of hydrocyclone equipped with grit pot was 6,272 mg/L, which was 200 times higher than classical hydrocyclone while the grit concentration from aerated grit chamber was only 1,800 mg/L. In term of operating parameter, the most important parameters for hydrocyclone efficiency were inlet pressure, diameter of hydrocyclone, underflow diameter and grit pot operating times. Therefore, hydrocyclone equipped with grit pot is an interesting choice to replace the aerated grit chamber in municipal wastewater treatment, because of its compactness, high separation efficiency, high concentration and energy saving. Moreover, hydrocyclone equipped with grit pot also resolves the problem of wastewater with high dissolve oxygen before turn into A/O activated sludge process.