Characteristics of Nitrogenous Compounds'' Conversions in a Shallow Slow-Flowing Channel

• Main Authors: Tseng, Hua-Tan, 曾華潭
• Other Authors: Ouyang C.F.
• Format: Others
• Language: zh-TW
• Published: 1996
• Online Access: http://ndltd.ncl.edu.tw/handle/89202434323201224187

碩士 === 國立中央大學 === 環境工程學系 === 84 === The characteristics of nitrogenous compounds'' conversions in shallow,slow-flowing channels are apparently different from that in large rivers. An artificial channel was installed in a laboratory where temperature was controlled at 200C. Four sets of tests were carried out to investigate the nitrogenous compounds'' conversions and its pathways at various experimental conditions ( including flow velocities, DO and COD concentrations ). Several conclusions relating to this study are presented as follows:1.At high DO and low COD conditions: Ammonium nitrogen removal rate increased with increasing Reynolds number when flow conditions were within laminar regimes. On the other hand,ammonium nitrogen removal rate decreased with increasing Reynolds number when turbulent flow occured.2.Ammonium nitrogen removal rate increased with increasing DO concentration when flow velocity was constant ; oxidized nitrogen generation rate increased but later decreased under the same flow condition. 3.When DO concentration was high (>4mg/L) and COD concentration was low, the relationships between ammonium nitrogen removal rate and Reynolds number is like a reversed V-shaped curve. In contrast, under higher COD and DO concentrations, the ammonium nitrogen removal rate increased with increasing Reynolds number, and later slightly decreased to a constant level when Reynolds number continuously increased.