Laboratory study about the influences of sediment concentrations on water quality monitoring of Yellow River in Lanzhou

摘要

The relationships between sediment concentration and the conventional pollutants in Lanzhou section of the Yellow River, and the influences of sediment on water quality parameters were investigated in this paper. The results indicated that: (1) the total CODMn of water sample, both in the muddy water samples and water samples under pretreatment with acid, increased significantly with increasing sediment concentration while the ones without pre-treatment did not increased significantly; (2) with the increase of sediment concentration, the NH3-N of the water sample increased significantly, and the changes under pre-treatment with acid were more significantly than the ones with no pre-treatment; (3) with the increase of sediment content, the BOD5 of water sample increased significantly, the changes under agitate conditions were more remarkable than static conditions. The BOD5 of water sample increased significantly with increasing solid concentration, and the changes under agitate conditions were more significantly than the ones under static conditions.