Nature Environment and Pollution Technology

Yali Yu ¹, Xunchi Pu ¹, Ran Li ¹, Hong Jiang ², Yong Li ¹

Affiliations
1 State Key Laboratory of Hydraulics & Mountain River Engineering Sichuan University, Chengdu 610065, CN
2 Chengdu Engineering Corporation Limited Power China, Chengdu 610072, CN

Abstract

Water landscape quality is an important part of environmental quality. However, in the environment impact assessment, there is no method at present that can quantitatively assess the colour changes of the water landscape affected by sediments. This paper presents a conception of organoleptic chromaticity according to the engineering requirement. Water organoleptic chromaticity is defined as a water chromaticity which is caused by both soluble substances and insoluble substances and observed directly by naked eyes. Using the spectrophotometry, it was found that the maximum absorption peak of coloured-turbid water occurred at 350nm which is defined as the characteristic wavelength of water organoleptic chromaticity. Based on the standard turbidity and chromaticity solutions, the metric system of organoleptic chromaticity was established. The absorbance of water with different turbidity and chromaticity showed that it is linear with the organoleptic chromaticity. Measuring the organoleptic chromaticity of different sandy waters, the results demonstrated that the metric system of organoleptic chromaticity could apply to the quantitative assessment of landscape quality for engineering sandy water in practical engineering.

Keywords

Organoleptic Chromaticity, Sediment Water Landscape, Spectrophotometry.

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Ying Liu ¹, Yong Li ¹, Yanxiong Jiang ¹, Dongmei Wang ¹

Affiliations
1 Southwest Jiaotong University, No. 111 North 1st Section, Erhuan Road, Chengdu, CN

Abstract

Through laboratory study, the isothermal absorption characteristics and dynamics characteristics of sediment to phosphate in Yangtze River Yibin Section were analysed. The study shows that the absorption curve of sediment is in good compliance with Langmuir and Freundlich isothermal absorption curves, which means that the sediment can absorb the phosphate spontaneously, and the absorption is done by polymolecular layer, for which the maximum theoretical absorption amount is 13.969mg/g, and the empirical constant n>1, which shows the sediment in Yangtze River Yibin Section has great absorption activity. Through analysis of primary and secondary dynamics model, it shows that the absorption of phosphorus is divided into fast absorption and slow absorption period, and the secondary dynamics equation can simulate the process more accurately. Under different sediment and water ratio, the relative error of theoretical equilibrium concentration and experimental equilibrium concentration calculated from the equation is less than 5%.

Keywords

Yangtze River, Sediment, Phosphorus, Absorption Mechanism.

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