Biophase separation device

The invention relates to the technical field of water treatment, in particular to a biophase separation device. Waste of anaerobic bacteria in a first working cavity is reduced, and using limitation is lowered; secondary pollution is reduced, and environment friendliness is improved. The biophase separation device comprises an anaerobic box, a first water pipe, a second water pipe, an aerobic box,a supporting plate, an air pump, an air pipe and a third air pipe, the first working cavity is arranged inside the anaerobic box, a first lower opening is arranged at the bottom end of the anaerobicbox and communicated with the first working cavity, and a first collection bucket is communicated at the bottom end of the first lower opening; the biophase separation device further comprises an isolation box, a fourth water pipe, a sludge circulating pump and a backflow pipe, a third working cavity is arranged inside the isolation box, and a third lower opening is arranged at the bottom end of the isolation box and commu