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| 標題: | Application of an innovative front aeration and internal recirculation strategy to improve the removal of pollutants in subsurface flow constructed wetlands |
| 作者: | Lin, Chien Jung
Chyan, Jih Ming
Zhuang, Wen Xue
Vega, Floradelle Aboga
Mendoza, Rose Marie O.
Senoro, Delia B.
Shiu, Ruei Feng
Liao, Chih Hsiang
Huang, Da Ji |
| 貢獻者: | Chia Nan Univ Pharm & Sci, Dept Environm Resources Management
Adamson Univ, Dept Environm Sci & Engn
Mapua Univ, Civil Engn & Environm Engn
Univ Calif, Bioengn, Merced
Camarines Norte State Coll
Adamson Univ, Grad Sch Engn |
| 關鍵字: | Constructed wetlands
Front aeration
Internal recirculation
Biochemical oxygen demand
Ammonia-nitrogen
Total nitrogen |
| 日期: | 2020 |
| 上傳時間: | 2022-11-18 11:22:59 (UTC+8) |
| 出版者: | Academic Press Ltd- Elsevier Science Ltd |
| 摘要: | The pollutant removal performance of traditional horizontal subsurface flow (HSSF) constructed wetlands (CWs) is limited because of the dissolved oxygen (DO) supply is insufficient. The aeration of HSSF CWs usually improves their pollutant removal performance, but a high DO induces the accumulation of nitrate-nitrogen (NO3--N) and suppresses the improvement of total nitrogen (TN) removal. In this study, an integrated solution that involved in-tank front aeration and internal recirculation (FAIR) was used to improve the pollutant removal performance of HSSF CWs. Based on the experimental results, the FAIR system significantly increased the removal efficiencies of biochemical oxygen demand (BOD) from 53.8-76.0% to 82.0-91.7% and reduced the BOD concentration in the effluent to below 10 mg L-1. The removal efficiency of ammonia-nitrogen (NH3-N) increased from 15.1-78.3% to 98.5-98.6% while the removal efficiencies of the total Kjeldahl nitrogen (TKN) of the control and FAIR HSSF CWs were 18.2-77.1% and 93.5-94.3%, respectively. HSSF CWs with FAIR outperformed aerated HSSF CWs in the removal of NH3-N and TKN. The effects of two recirculation flow ratios (Rr = recirculation flow rate/influent flow rate), 14.3 and 3.0, on the improvement of pollutant removal performance were investigated. The lower Rr did not significantly affect the improvement of BOD, NH3-N, and TKN, but a higher Rr resulted in more severe accumulation of NO3--N. The removal efficiency of TN in control HSSF CWs ranged from 20.4% to 75.5%, and in the FAIR HSSF CW was 71.6% for Rr = 14.3 and 81.3% for Rr = 3.0. However, the FAIR system did not enhance the removal performance of total phosphorus, suggesting that the DO level and internal recirculation were not dominant mechanisms for the removal of phosphorous. The easy maintenance of the FAIR system made it a superior modification for improving the pollutant removal performance of HSSF CWs. |
| 關聯: | Journal of Environmental Management, v.256, pp.9 |
| 顯示於類別: | [環境資源管理系(所)] 期刊論文
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