為探討景觀水池循環流量對人工溼地景觀水池淨化含氮污染物之影響，本專題研究應用潛流式人工溼地改善台南市某社區原有景觀水池惡化的水質，藉由氨氮、亞硝酸鹽、硝酸鹽等參數評估人工溼地系統之對含氮污染物的控制與穩定效能，同時也探討循環水流對系統效能的影響。根據由本研究之相關初步結果可發現景觀水池之水溫於觀測期間約為16.2~25.6℃，pH 值介於7.4~8.7，溶氧約介於3.2mg/L~7.1mg/L，此環境頗適於硝化反應，水力停留時間為2.91hrs 時，氨氮經8 日後，其濃度即從16.22mg/L 降至減至0.084mg/L，而水力停留時間為3.36hrs 時則需12 天始降為0.1 mg/L，較長之停留時間與較高之溫度可提升氨氮之降解。而於氨氮降為背景值時亞硝酸鹽氮之濃度出現最大值；4.08mg/L 與4.61mg/L，其後降為背景值，此時，硝酸鹽氮濃度將隨之達最高濃度；67.85mg/L 與49.3mg/L，此濃度降至背景值需40 天與25 天，此與一般人工濕地之研究結果不同，其原因係水中之高溶氧不利於脫硝，致使硝酸鹽氮之累積現象較為明顯，惟系統中之潛流式人工溼地將其濃度降至背景值。 In the present study, a subsurface flow (SSF) constructed wetland was merged to the landscape pond of apartment to improve the water quality. To investigate the effect of recirculation flow rate on the degradation of ammonia, the concentration of ammonia-nitrogen, nitrite-nitrogen, and nitrate-nitrogen were used to assess the performance. According to the results obtained, the temperature, pH, and dissolved oxygen of the water is quite fit to the requirements of nitrification reactions. As the longer the hydraulic retention time is, the faster the concentration of ammonia-nitrogen decreases to the background level. However, due to the high dissolved oxygen, nitrate-nitrogen was found to be accumulated in the water. It takes a longer time to decrease the nitrate-nitrogen for SSF.
