Jump to Main Content
Nitrogen removal from secondary effluent by using integrated constructed wetland system
- Xiong, Jibing, Guo, Guangli, Mahmood, Qaisar, Yue, Min
- Ecological engineering 2011 v.37 no.4 pp. 659-662
- Coix, ammonium nitrogen, constructed wetlands, gravel, nitrate nitrogen, nitrite nitrogen, nitrogen, peat, sand, slags, steel
- The treatment capacity of an integrated constructed wetland system (CWS) that was designed to reduce nitrogen (N) from secondary effluent was explored. The integrated CWS consisted of vertical-flow constructed wetland, floating bed and sand filter. The vertical-flow wetland was filled with gravel, steel slag and peat from the bottom to the top. Vetiver zizanioides was selected to grow in the vertical-flow constructed wetland and Coix lacrymajobi L. was grown in the floating bed. The results showed that the integrated CWS displayed superior removal efficiency for nitrate nitrogen (NO₃ ⁻-N), ammonia nitrogen (NH₄ ⁺-N), nitrite nitrogen (NO₂ ⁻-N), and total nitrogen (TN). The average NO₃ ⁻-N, NO₂ ⁻-N, NH₄ ⁺-N and TN removal efficiencies of the integrated CWS were 98.83%, 95.60%, 98.05% and 92.41%, respectively, during the whole experimental operation. The integrated CWS may have a good potential for removing N from secondary effluent.