大镜山水库底泥磷释放模拟研究

通过模拟实验,研究了从耗氧到厌氧转变过程中期间大镜山水库底泥磷的释放特征。结果表明:两处底泥均表现为磷的释放,大坝区底泥释放速率高于库中区的底泥;两个点底泥的磷释放速率均先升高后缓慢降低,在第2周达到最大值;大坝区域底泥总磷和可溶性总磷释放的最大速率分别为6.64mg·m^-2·d^-1和1.37mg·m^-2·d^-1,库中区底泥的总磷和可溶性总磷的释放速率最大值分别3.24mg·m^-2·d^-1和0.62mg·m^-2·d^-1;底泥上覆水的氧化还原电位和pH均趋下降趋势,它们是影响底泥磷释放的重要影响因子。

The simulation experiment of sediment phosphorus release in Dajingshan Reservoir

Phosphorus release character from the sediment of Dajingshan Reservoir during the transition from anoxic to aerobic condition was studied by simulation experiments. Phosphorus was released from the two types of sediments collected from the dam area and the centre of the Dajinshan reservoir during the period of the study. Phosphorus release rate at the dam area is faster than that of the centre of the reservoir. Release rates for both the total phosphorus and the total dissolved phosphorus increased at first and then decreased slowly then get to the peak two weeks later. Release rate of the dam area for both total phosphorus and total dissolved phosphorus reached the maximum of 6.64 mg·m^-2·d^-1 and 1.37 mg·m^-2·d^-1,respectively. And for the sediment from the center of the reservoir were 3.24 mg·m^-2·d^-1 and 0.62 mg·m^-2·d^-1,respectively. The redox potential and pH for the overlying water in the simulation experiments showed a decreasing trend,which are two important factors affecting phosphorus release rate.