Research on rural domestic sewage treatment by combination of A2/O and artificial subsurface flow wetland

To deal with the pollution of rural domestic sewage in Yunnan province, the treatment process of A²/O with solar power micro-aeration and artificial subsurface flow wetland with gravel molecular sieve was proposed. The domestic sewage from Da gou jing village in Jin ning county in Yunnan province was taken as experiment subject. The factors that affect the removal rate of pollutants, including the daily aeration time, retention time, floristics in wetlands were researched. The study showed the condition of the aeration time of 12h, sewerage retention time for 1.4d and planted with canna in subsurface-flow wetland can efficiently treat the rural sewage. This method can obtain a good efficiency with less land. Aeration with solar power can reduce operating and maintenance costs, which is suitable for popularize in rural areas.