Integrated system and process for treating domestic sewage of villages and towns

The invention provides an integrated system and process for treating domestic sewage of villages and towns and belongs to the technical field of environment protection and sewage treatment. Main body parts of the system comprise four space parts including an adjusting tank, an anaerobic pre-reaction tank, a main biochemical reaction tank and an inclined tube sedimentation basin; the four parts are combined and integrated into a process unit by adopting a separation plate; other parts of the system comprise a grid, a disinfection device and a PAP metering device. The adjusting tank is used for adjusting the water quantity of input water and homogenizing the water quality. Modified suspension packing is added into the anaerobic pre-reaction tank and the anti-impact load of the process is enhanced, so that the pre-reaction treatment effect is better. The main biochemical reaction tank has a simple structure and physical regions are not formed in the tank; a water input and water distribution pipe and a disc type