Study on the comprehensive evaluation of water quality status of the middle route main channel of the South2to2North Water Diversion Project
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Abstract:
In order to objectively and scientifically reflect the water quality of the main channel of the middle route of the South-to-North Water Diversion Project ( MRSNWDP ) , the monthly water quality monitoring data of 8 routine monitoring sections along the main channel from January 2015 to May 2018 was selected for comprehensive water quality assessment. The results of the single-factor evaluation indicated that the water quality of the MRSNWDP main channel was class ó . The evaluation result was class ?2 ò ( based on mean and median) and class ?2 ? ( based on maximum) , If the total nitrogen was not taken into account. The comprehensive pollution index evaluation results showed that all sections of the main channel were between 01 16 and 01 30, and the evaluation results of all sections were qualified. The proportion of total nitrogen to pollution index of most sections was mo re than 50% . T he fuzzy evaluation results showed that the membership degree of class ? water quality standard was more than 01 7 class ò water quality standard was between 01 14 and 01 17, respectively. The membership degree of ó2 ? water quality standard was very low. T he final evaluation results of water quality were all class ? . Based on the three evaluation results, the water quality of the MRSNWDP main channel was generally good and can meet the water supply quality reqirements.
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