The invention relates to the
environmental protection technology, and particularly relates to a domestic
sewage treatment apparatus. The invention aims to provide a domestic
sewage treatment apparatus which is stable, high in efficiency and low in cost. A cylindrical integrated biological treater for domestic
sewage comprises a cylinder, an inner tube is arranged in the cylinder, and an inner cavity of the inner tube forms a regulating-
hydrolysis cavity; a space between the inner tube and the cylinder is sequentially partitioned along the circumferential direction so as to form a primary aerobic cavity, a primary anoxic cavity, a secondary aerobic cavity, a secondary anoxic cavity and a
settling cavity which are independent; the regulating-
hydrolysis cavity is connected with a water inlet
pipe, the bottom of the primary aerobic cavity is interconnected with the bottom of the primary anoxic cavity, and the bottom of the secondary aerobic cavity is interconnected with the bottom of the secondary anoxic cavity; the upper parts of the regulating-
hydrolysis cavity, the primary anoxic cavity, the secondary aerobic cavity and the secondary anoxic cavity are respectively provided with a gap leading to a downstream cavity; the upper part of the
settling cavity is provided with a water outlet and a mud
discharge device; and an
aeration device is respectively arranged in the primary aerobic cavity and the secondary aerobic cavity, and a stirring device is respectively arranged in the primary anoxic cavity and the secondary anoxic cavity.