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Chang, Xiangping
- Study on the Pollutant Diffusion Regularity in Open Channel with Vegetation
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Affiliations
1 College of Urban Construction, Hebei University of Engineering, Handan, Hebei, CN
1 College of Urban Construction, Hebei University of Engineering, Handan, Hebei, CN
Source
Nature Environment and Pollution Technology, Vol 14, No 2 (2015), Pagination: 439-444Abstract
Instream vegetation not only affects the discharge capacity of the river but also plays an important role in the pollutants diffusion. So it is very important to study the pollutants diffusion in the open channels with vegetation. In order to experimentally investigate the effects of rigid vegetation on the characteristics of flow, the vegetation was modelled by a rigid cylindrical rod. The flow field is measured under the conditions of submerged rigid rod in a flume with single layer and double layer vegetation. Experiments were performed for various spacing of the rigid rods. The vegetation models were aligned with the approaching flow in a rectangular channel. Vertical distribution of pollutants was evaluated using image processing methods. The results indicate that the vegetation has a more stable effect on the spread of pollutants.Keywords
Open Channel, Instream Vegetation, Pollutant Diffusion, Longitudinal Dispersion.Full Text
- Experimental Study on the Influence of Sediment on COD Degradation
Abstract Views :120 |
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Authors
Affiliations
1 College of Urban Construction, Hebei University of Engineering, Handan 056038, CN
1 College of Urban Construction, Hebei University of Engineering, Handan 056038, CN
Source
Nature Environment and Pollution Technology, Vol 13, No 4 (2014), Pagination: 855-858Abstract
According to the characteristics of river sediment having greater impact on COD values, simulation experiment was used to explore the impact of sediment concentrations on COD, revealing the relationship between COD values and sediment. The level of sediment concentration has a more significant effect on COD degradation; higher the sediment concentration is, the greater is the rate of COD degradation. Sediment particle size also affects the rate of degradation of COD in water. With smaller particle size the rate of COD degradation is increased. This is because with the smaller particle size, the surface area is large, which in aqueous phase contaminants make it easier to achieve COD degradation.Keywords
COD, Sediment Concentration, River Water, Sediment Particle Size.Full Text