河口水与污水混合有机物和磷的转移动力学

污水与九龙江河口水混合研究表明，ＣＯＤ的降解符合一级动力学模式，降解速率常数ｋ在０．０４－０．１１ｄ＾－１之间，水体有机物的转移以降解作用为主；两种水体混合时，先产生磷的吸附，后释放，整个过程表现为颗业磷向溶解无机磷的转移。

Transfer kinetics of organic pollutants and phosphorus during sewage-estuarine water mixing

The transfer kinetics of organic pollutants and phosphorus during the mixing of sewage and seawater with different salinity from Jiulongjiang Estuary are simulated. The degradation of COD follows the first-order kinetic equation:1nc= -kt B,and the values of k falls between 0. 04 and 0. 01d-1 in the experimental conditions. The degradation is the major process of organic transfer.During sewage-seawater mixing,adsorption of phosphorus occurs in the first day and then continuous release. The overall processes show a transfer from particulate phosphorus to dissolved inorganic phosphorus. The release of particulate phosphorus can be expressed by an exchange-adsorption kinetic model t/Xp (t) = t/Xp (eq)] B'. The Xp(eq ) and Xp (eq) calculated from the model are very close to those measured. The Xp(eq) provides the maximum release of phosphorus under specified conditions. The increasing rate of dissolved inorganic phosphorus is governed by the first-order kinetic model:1nc=kipt b. The value of kir related closely to the initial adsorption rate and the net increasing rate is deduced to about 0. 01d- 1,and can be applied to rectify the environment capacity of phosphorus.