RESOURCES AND ENVIRONMENT IN THE YANGTZE BASIN >> 2017, Vol. 26 >> Issue (01): 134-141.doi: 10.11870/cjlyzyyhj201701016

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DEGRADATION OF POLLUTANTS IN THE DOWNSTREAM OF A SEWAGE OUTFALL IN CHONGQING SECTION OF THREE GORGES RESERVOIR

ZU Bo1,2,3, ZHOU Ling1,2,3, LI Guo-quan1,3, LIU Bo1,3   

  1. 1. National Engineering Research Center for Inland Waterway Regulation, Chongqing Jiaotong University, Chongqing 400074, China;
    2. Key Laboratory of Hydraulic and Waterway Engineering of the Ministry of Education, Chongqing Jiaotong University, Chongqing 400074, China;
    3. Chongqing Jiaotong University College of Hehai, Chongqing 400074, China
  • Received:2016-05-11 Revised:2016-07-06 Online:2017-01-20
  • Supported by:
    The graduate student innovation fund project of Chongqing;Chongqing Graduate Education Teaching Reform Research Key Project (yjg20162025)

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Abstract: In this work we combined in-situ test and laboratory experiment methods, and selected CODMn, TN, TP and ammonia nitrogen as the pollutant indicators, to calculate the degradation coefficient of pollutants and analyzing the regularity of the degradation. The results showed that:(1) In the in-situ test, the pollutants degradation coefficients for the riparian monitoring section was significantly smaller than those for the river center monitoring section, but they had the same degradation trends. Compared with the various factors between the shore and river center, except for the velocity of shore and river center, the temperature, DO and pH had no significant difference, suggesting the velocity was the influencing factor of the pollutants degradation coefficient, and the greater of the velocity, the greater of the degradation coefficient;(2) In the laboratory experiment, the pollutant degradation coefficients gradually increased along with the increase of flow velocity(0.4~2.0 m/s), which was the same as in the field in-situ test, suggesting the velocity was the influencing factor of the pollutant degradation coefficient. Based on the results of both field in-situ test and laboratory experiment, we used structural equation modelling to quantitatively analyze the relationships between pollutant degradation coefficient and the impact factors. The results showed that the flow velocity was an important factor for the degradation coefficient. Finally, based on the quantitative results of the structural equation model, we regarded the pollutants degradation coefficient as a function of velocity, and the empirical formula was fitted by the wild field measurement data. In our study condition range, the empirical formula can be applied to quickly calculate the coefficient of pollutants degradation.

Key words: Three Gorges Reservoir, downstream of a sewage outfall, pollutants, degradation

CLC Number: 

  • X13
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