[1]ZHENG Qunwei,SU Weici,YANG Zhenhua,et al.Assessment of Water Environmental Quality and Analysis of Pollution Sources in Wujiang River Basin[J].Research of Soil and Water Conservation,2019,26(03):204-212.
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Assessment of Water Environmental Quality and Analysis of Pollution Sources in Wujiang River Basin
Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume:
26
Number of periods:
2019 03
Page number:
204-212
Column:
Public date:
2019-04-12
- Title:
- Assessment of Water Environmental Quality and Analysis of Pollution Sources in Wujiang River Basin
- Keywords:
- Wujiang River Basin; water environment assessment; water quality identification index; absolute principal component multiple linear regression (APCS-MLR)
- CLC:
- X824
- DOI:
- -
- Abstract:
- In order to fully understand the water pollution situation in Guizhou section of the Wujiang River Basin. According to the water quality monitoring data of high water period in Guizhou section of Wujiang River Basin in median water period, low water period of 2016, the water quality status was evaluated by single factor and comprehensive water quality marking index. And absolute principal component multiple linear regression analysis (APCS-MLR) was used to quantify the contribution of different principal components to each pollutant. The results showed that the water quality indexes of dissolved oxygen and total phosphorus in high water period were higher than those in dry water period, permanganate index, chemical oxygen demand, 5 days biochemical oxygen demand and ammonia nitrogen did not change obviously in each water period; total phosphorus was the main pollution factor of water environment, followed by chemical oxygen demand, 5 days biochemical oxygen demand and dissolved oxygen; the water quality of Qingshuihe River Basin was the worst, the average sample point exceeding standard rate is 62% in the three water period, 20% of the sample points in Xiangjiang River Basin exceeded the standard seriously, the exceeding standard point was inferior to water, the water quality of the middle reaches of Wujiang River main stream was the second, and the water quality of the middle reaches of Wujiang River was inferior to that of the water in the middle reaches of Wujiang River. The other watershed samples were above Ⅱ and no samples exceeded the standard, and the water quality of Wujiang River Basin in the high water period was slightly lower than that in the plain and dry water periods by agricultural non-point sources. According to the results of principal component analysis) and APCS-MLR analysis, the first principal component was significantly correlated with ammonia nitrogen in high water period, and the contribution rate was 45.99, which indicated that ammonia nitrogen was the main pollutant in high water period, and the first principal component was mainly chemical oxygen demand in normal water period. 5 days biochemical oxygen demand and ammonia nitrogen were significantly correlated, and their contribution rates were 117.88%,117.39% and 118.38%, respectively, indicating that chemical oxygen demand, five days’ biochemical oxygen demand, ammonia nitrogen were the main pollutants in the normal water period; the first principal component was correlated to chemical oxygen demand, five days’ biochemical oxygen demand, ammonia nitrogen, and total phosphorus in dry season, respectively, the contribution rates of chemical oxygen demand, five days’ biochemical oxygen demand, ammonia nitrogen, and total phosphorus were 6.38%,6.08%,6.21% and 6.26%, respectively, indicating that these factors were the main pollutants in the dry season. The results show that the pollutants mainly came from the domestic sewage, domestic refuse discharge, agricultural non-point source and phosphorus chemical industry wastewater discharge from towns, villages, and some cities and counties in the river basin. The worst water quality in Qingshui River Basin and Xiangjiang River Basin on J33 testing station was dominated by urban point source pollution.
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1900-01-01