Bypass sludge reduction and silt separation and denitrification and dephosphorization waste water treatment system and method

The invention provides a bypass sludge reduction and silt separation and denitrification and dephosphorization waste water treatment system and a bypass sludge reduction and silt separation and denitrification and dephosphorization waste water treatment method for solving the frequency problems of high sand content in incoming water, low volatile suspended solid (VSS)/mixed liquor suspended solids (MLSS), inadequate carbon source and the like in the conventional denitrification and dephosphorization process. The system consists of a main waste water treatment system having denitrification and dephosphorization functions and a bypass system, wherein the main waste water treatment system comprises a grit chamber and a waste water treatment system having denitrification and dephosphorization functions; and the bypass system consists of a hair separator, a sludge reduction pool, a sludge and silt separator, a silt dewatering system and a chemical dephosphorization system. In the invention, by discharging the slud