Evaluation of Pollutant Removal Efficiency in Environmentally Friendly Full-scale Constructed Wetlands for Treating Domestic Sewage during Long-term Monitoring

Abstract

A constructed wetland which was composed of aerobic and anaerobic areas was evaluated for 3 years to effectively treat the sewage produced in farming and fishing communities. For 3 years in a constructed wetland, biochemical oxygen demand(BOD), chemical oxygen demand(COD), suspended solids(SS), total nitrogen(T-N), and total phosphorus(T-P) in effluent were 0.2~11.8, 1.0~41.9, 1.1~6.5, 4~60 and 0.02~3.51 mg/L, respectively. Removal rate of BOD, COD and SS in effluent were 97, 92 and 99%, respectively, in the third year. As time goes by, removal rate of T-N and T-P in treated water in aerobic area and effluent were gradually increased in a constructed wetland. In the third year, removal rate in effluent were 62 and 73%, respectively. By the seasons, removal rate of BOD, COD, SS, T-N and T-P were 97~98, 87~91, 99, 43~61 and 76~86%, respectively. Removal rate of BOD, COD, SS and T-P were not affected by the seasons, but that of T-N in winter and spring were decreased than the other seasons.

Seasonal treatment efficiency of surface flow constructed wetland receiving high nitrogen content wastewater

“…Several studies on the CWs applicable to livestock wastewater and sewage in Korea have begun in 2000 [11][12][13]. Lab scale and pilot scale studies were applied using CWs.…”