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针对悬浮泥沙与长江原水CODMn的关系开展试验研究,发现悬沙对CODMn衰减存在明显的促进作用,随着水温和悬沙浓度的上升,原水CODMn衰减速率系数增加;原水中悬沙颗粒粒径分布直接影响CODMn衰减过程,细颗粒含量越高,CODMn衰减速率系数越大。现场研究显示,沉淀作用和悬沙表面的生物降解作用是陈行水库原水COD改善的主要原因。
According to the experimental study on the relationship between suspended sediment and CODMn in the Yangtze River, it is found that suspended sediment can significantly promote the decay of CODMn. With the increase of water temperature and suspended sediment concentration, the decay rate coefficient of CODMn in raw water increases. The distribution directly affects the decay process of CODMn. The higher the content of fine particles, the larger the decay rate coefficient of CODMn. Field studies have shown that sedimentation and the biodegradation of suspended sediment surface is the main reason for the improvement of COD in the raw water of Chenxing Reservoir.