Evaluation of Groundwater Quality Based on a Fuzzy Comprehensive Optimization Model-With a Petrochemical Site for Example
In order to reduce the risk assessment of low efficiency and improve the groundwater man-agement and control measures,a groundwater qual-ity evaluation method was proposed to facilitate the classification and control of points and blocks in a petrochemical site. The monitoring concentrations of petroleum hydrocarbon,ammonia nitrogen,benzene,volatile phenols,chloride,iron,manganese,nitrate,copper,oxygen consumption,arsenic and sulfate in groundwater were selected and fuzzy evaluation was carried out through an optimized fuzzy evalua-tion method. The optimized fuzzy evaluation method improved the shortcomings of fuzzy evaluation. The combination weight was used to determine the index weight,the relative membership degree in the form of interval was introduced,the fuzzy relationship between water quality and evaluation index was established,and the water quality grade was determined by the size of the grade characteristic value. The evaluation results were not only more accurate and effective,but also compatible with the index data in the fuzzy eval-uation method and the corresponding national stan-dards. The results showed that the water quality eval-uation results based on the combined weights and the improved fuzzy comprehensive evaluation model had higher feasibility and accuracy than the conventional model with a single weight,and the dependence on the sample index weight was lower,which was consistent with the actual situation. The research results can re-alize the accurate classification of monitoring points,and provide convenience for the site pollution risk management of enterprises.
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