太湖梅梁湾南部水体有机污染物降解表观动力学初步分析

Preliminary Analysis on Apparent Dynamics of Organic Pollutants on the Decline in the South of Meiliang Bay, Taihu Lake

有机污染是太湖水质恶化的重要原因之一．本文在20℃和30℃恒温振荡条件下，应用化学反应动力学原理定量模拟和研究了太湖梅梁湾南部附近水体中，有机污染指标COD（Mn）降解的一级反应过程．应用Arrenius系列公式，分别得到20℃和30℃下的降解速率常数（k20＝0．01856d（－1），k30＝0．0364d（－1））、表观活化能（Eu＝4．9×104J）及指前因子A．提出太湖梅梁湾南部水体COD衰减表达式为：Ct＝C0·exp［－1．49×10e7（－4．9×104／RT）t］．

The organic pollution is one of the important questions of the water quality deterioration in Taihu Lake. The natural degradation of COD, approximately representing the total organic pollutants, in the south of Meiliang Bay of the lake was mechanically studied and quantitatively simulated by means of the mechanism of chemical reactions. Under the conditions of constant temperature (20℃ and 30℃) and uniform shaking, the one-order reaction process of COD degradation was quantitatively analyzed and simulated on the basis of Arrenius equations. The rate constants of degradation (k20=0.01856d(-1), k30=0.0364d(-1)) were calculated in 20℃ and 30℃. The constants may increase by two times when the temperature increased 10℃. As a result, the apparent active energy (Ea) and the factor before index (A) were estimated to be about 4. 9×104J and 1.49×107 J, respectively. The formula of COD declining of the Meillang Bay, Taihu Lake was made out:Ct=C0·exp[-1. 49×107e (-4.9×107/RT)t].