比表面积促进水体过饱和溶解氧释放的试验研究

Experimental Research on Promotion of Supersaturated Dissolved Oxygen Dissipation by Surface Area

水坝高流速、大流量泄水伴随的强掺气作用导致下游水体中溶解气体过饱和,致使鱼类患气泡病甚至死亡。而水体中固体介质的存在可以促进过饱和溶解气体的释放,从而减小过饱和气体对鱼类的影响。对此,以活性炭为固体吸附介质,试验研究了介质不同比表面积对过饱和溶解氧释放过程的影响。结果表明,随着活性炭比表面积的增大,其对过饱和溶解氧释放的促进作用显著。研究结果为利用固体介质加快水体内过饱和气体释放提供了科学依据,亦可据此提出工程上减缓过饱和溶解气体对鱼类影响措施。

The supersaturated total dissolved gas （STDG） produced by the high-speed and large amount discharge of dam would cause fish to suffer from the bubble disease and even to death. The solid medium in water can promote the release of STDG, thereby reducing the effect of STDG on fish. This paper studied the effect of specific surface area of the activated carbon as solid medium on the release of supersaturated dissolved oxygen （SDO）. The results show that the higher specific surface area of active carbon, the more release of SDO. This study can provide scientific basis for the understanding of the influence of solid medium on the release of STDG, and shed light on the possible engineering methods to mitigate the effect of STDG on fish.