The relationship between the River Quality Indicators and the Water Quality Classification Criteria

• Main Authors: Lin Hui-Chiao, 林惠嬌
• Other Authors: 王根樹
• Format: Others
• Language: zh-TW
• Published: 2003
• Online Access: http://ndltd.ncl.edu.tw/handle/82001792609834543970

碩士 === 國立臺灣大學 === 環境衛生研究所 === 91 === The characteristics of river water quality can be representing either by a single or multiple indicators. Among the many indicators, BOD (Biochemical oxygen demand), DO (Dissolved oxygen), NH3-N (Nitrogen) and SS (Suspended solid) are most widely used as a single indicator in Taiwan.On the other hand, WQI (Water quality index), RPI (River pollution index) and achieve rate of water quality classification criteria are widely used as multiple indicator. By choosing the appropriate indicator pollutants, the results can be used to represent the river water quality and to judge if the water quality classification criteria has been met. For example, the NH3-N concentration can be used as a indicator for Kee-Long River, and its value contributes more then forty percent of the achieve rate of water quality classification criteria. The concentrations of both the NH3-N and BOD concentration both can be used as indicators for Na-Kan River, where their values contribute more then thirty-six percent of the achieve rate of water quality classification criteria. The concentrations of both the NH3-N and SS can be used as indicators for Kuo-Pin River, where their values contribute more then thirty percent of the achieve rate of water quality classification criteria. The suitability of the concentrations of NH3-N and BOD in water quality classification criteria were also discussed. For example, the NH3-N concentration criteria only regulated for Class A, B and C in current criteria. Under this strict criteria, the NH3-N was responsible for the low achieve rates for all of the three major rivers discussed in this study. Therefore, this study also discuss the reasonable criteria for NH3-N.